Claims
- 1. A method for receiving signals in a radio communication system, comprising:
detecting a signal at a given element of plural elements forming an antenna array; and applying a code to the signal proximal to the given element to distinguish the signal from among plural signals received by the plural elements to apply beam forming to the received signals in the radio communication system.
- 2. The method as claimed in claim 1, further including:
applying codes to the signals proximal to the respective elements; and summing the coded signals from the plurality of elements to form a code division multiplexed signal.
- 3. The method as claimed in claim 2, further including producing a composite baseband signal corresponding to the code division multiplexed signal.
- 4. The method as claimed in claim 3, wherein producing the composite baseband signal includes:
controlling the gain of the received signals; down-converting the code division multiplexed signal; and sampling the code division multiplexed signal.
- 5. The method as claimed in claim 3, further including extracting the given signal received by the given element.
- 6. The method as claimed in claim 5, wherein extracting the given signal received by the given element includes multiplying the composite baseband signal by the code applied to the given signal.
- 7. The method as claimed in claim 5, further including applying a weight to the extracted signal.
- 8. The method as claimed in claim 7, further including:
extracting a subset of signals from the baseband signals; applying weights to the extracted signals; and summing the multiple weighted extracted signals to reconstruct signals producing a spatial beam forming effect.
- 9. The method as claimed in claim 3, further including:
replicating the codes applied to the signals at the elements; applying weights to the replicated codes; summing the coded weights to form a composite signal; multiplying the received baseband composite signal by the weighted composite signal; forming a single composite signal; and integrating the single composite signal over the duration of the code to reconstruct signals producing a spatial beam forming effect.
- 10. The method as claimed in claim 1, wherein applying a code to the signal includes modulating the code onto the signal; and
further including sampling the modulated signal, the timing between the modulating and sampling being locked to avoid sampling modulation-related transitions.
- 11. The method as claimed in claim 1, wherein the codes are orthogonal codes.
- 12. The method as claimed in claim 11, wherein the orthogonal codes are Walsh codes.
- 13. The method as claimed in claim 1, deployed in a base transceiver station.
- 14. A method for receiving signals in a radio communication system, comprising:
forming a first code division multiplexed signal composed of codes multiplied by RF signals detected by elements of an antenna array used for beam forming; forming a second code division multiplexed signal composed of coded weights associated with the elements of the antenna array; and decomposing the code division multiplexed signal in a beam-forming manner by modulating said first code division multiplexed signal with said second code division multiplexed signal to produce a weighted baseband signal to produce a spatial beam forming effect.
- 15. The method as claimed in claim 14, further including:
forming plural first code division multiplexed signals; forming plural second code division multiplexed signals; and modulating baseband representations of the plural first code division multiplexed signals with the plural second code division multiplexed signals to produce plural weighted baseband signals composing the beam forming.
- 16. The method as claimed in claim 15, further including integrating the weighted baseband signals over the duration of the codes to determine the content of the RF signals.
- 17. The method as claimed in claim 14, wherein forming the first code division multiplexed signal is performed proximal to the antenna.
- 18. The method as claimed in claim 17, wherein forming the second code division multiplexed signal is performed proximal to the antenna.
- 19. The method as claimed in claim 17, wherein forming the second code division multiplexed signal is performed distal from the antenna.
- 20. The method as claimed in claim 14, wherein forming the code division multiplexed signals includes coding (i) the RF signals from each element and (ii) weights intended for each element with the same codes in a one-to-one paired manner.
- 21. The method as claimed in claim 14, wherein a representation of said first code division multiplexed signal is generated in part by sampling a representation of the coded RF signal, the timing between the sampling the RF signal and modulating the RF signal with the codes being locked to avoid sampling modulation-related transitions.
- 22. The method as claimed in claim 14, wherein the codes are orthogonal codes.
- 23. The method as claimed in claim 22, wherein th e orthogonal codes are Walsh codes.
- 24. The method as claimed in claim 14, deployed in a base station.
- 25. A method for transmitting RF signals in a radio communication system, comprising:
receiving a signal to be transmitted; generating weights modulated by codes; and modulating the coded weights with the signal to be transmitted to produce a coded, weighted signal for beam forming.
- 26. The method as claimed in claim 25, further including:
modulating other coded weights, being modulated with the same codes, with other signals to be transmitted to produce respective coded, weighted signals for beam forming; and summing the coded, weighted signals to form a composite code division multiplexed signal.
- 27. The method as claimed in claim 26, further including:
converting the code division multiplexed signal to an analog representation; and up-converting the analog representation to an RF representation.
- 28. The method as claimed in claim 27, further including, at a given element in an antenna array used for beam forming, modulating the RF representation by at least one code to decompose the RF representation into a RF representation comprising weights and signals to be transmitted corresponding to the given element.
- 29. The method as claimed in claim 28, further including, proximal to a subset of elements in the antenna array, decomposing the RF representation into respective RF representations having at least one weight and at least one signal to be transmitted corresponding to the respective elements to form at least one beam having a pattern formed by the weights.
- 30. The method as claimed in claim 29, wherein the weights include amplitude information, phase information, or a combination thereof to produce the formed beam.
- 31. The method as claimed in claim 25, wherein the codes are orthogonal codes.
- 32. The method as claimed in claim 31, wherein the orthogonal codes are Walsh codes.
- 33. The method as claimed in claim 25, deployed in a base transceiver station.
- 34. A method for transmitting a signal in a radio communication system, comprising:
forming a first code division multiplexed signal composed of coded weights associated with respective elements of an antenna array used for beam forming; modulating the first code division multiplexed signal with a modulated data signal to produce a second code division multiplexed signal including both the weights and data for the elements of the antenna array; up-converting the second signal to an RF representation of the second signal; and using the same codes as used to form the first code division multiplexed signal, decomposing the RF representation of the second signal to apply the weights to respective elements of the antenna array for transmitting the RF representation from the antenna array in a beam-forming manner.
- 35. The method as claimed in claim 34, wherein said forming, modulating, up-converting, and decomposing are performed proximal to the antenna array.
- 36. The method as claimed in claim 34, wherein said forming, modulating, and up-converting are performed distal from the antenna array.
- 37. The method as claimed in claim 34, further including:
(i) forming plural code division multiplexed signals, including:
(a) respective modulated data signals; and (b) respective coded weights having the same codes but different weights; and (ii) summing the plural code division multiplexed signals to produce a composite code division multiplexed signal.
- 38. The method as claimed in claim 37, wherein decomposing the RF representation applies the plural code division multiplexed signals to the elements of the antenna array to transmit plural signals from the antenna array in a beam-forming manner simultaneously.
- 39. The method as claimed in claim 34, wherein up-converting includes converting the second code division multiplexed signal from digital to analog in a manner that avoids converting during code transition times.
- 40. The method as claimed in claim 34, wherein transmitting includes amplifying the RF representation at individual elements.
- 41. The method as claimed in claim 34, wherein the codes are orthogonal codes.
- 42. The method as claimed in claim 41, wherein the orthogonal codes are Walsh codes.
- 43. The method as claimed in claim 34, deployed in a base station.
- 44. Apparatus for beam forming in a radio communication system, comprising:
a first electronics assembly located distal from a plurality of elements in an antenna array used for beam forming; a second electronics assembly, located proximal to the antenna array; and transmission means spanning between said first and second electronics assemblies having fewer transmission paths than the number of elements in the antenna array being used in a beam-forming manner.
- 45. The apparatus as claimed in claim 44, wherein the transmission means is a fiber optic cable.
- 46. The apparatus as claimed in claim 44, wherein the transmission means is an RF cable.
- 47. The apparatus as claimed in claim 44, wherein the transmission means includes wires supporting baseband signals.
- 48. The apparatus as claimed in claim 44, wherein the transmission means is a wireless link.
- 49. The apparatus as claimed in claim 44, wherein the transmission means is a single transmission path selected from link types composed of: wire, fiber optic, RF cabling, RF wireless or optical wireless.
- 50. The apparatus as claimed in claim 44, wherein, in at least one of the electronics assemblies, to transmit a subset of signals to the elements of the antenna array, at least one code is applied to form at least one code division multiplexed signal composed of information corresponding to plural elements of the antenna array; and
said at least one code is applied to said at least one code division multiplexed signal to decompose the de-multiplexed signal.
- 51. The apparatus as claimed in claim 50, wherein the codes are applied in the first electronics assembly.
- 52. The apparatus as claimed in claim 50, wherein the codes are applied once in the first electronics assembly and applied once in the second electronics assembly.
- 53. The apparatus as claimed in claim 50, wherein, for more than one data signal, each data signal is multiplied by code division multiplexed weights, where the weights are specific to the respective data signal, and summed together to form a composite code division multiplexed signal.
- 54. The apparatus as claimed in claim 53, wherein the composite code division multiplexed signal is transmitted across a single transmission path between the first and second electronics assemblies.
- 55. The apparatus as claimed in claim 50, wherein the codes are orthogonal codes.
- 56. The apparatus as claimed in claim 55, wherein the orthogonal codes are Walsh codes.
- 57. The apparatus as claimed in claim 44, wherein an uncoded data signal is transmitted between the first and second electronic assemblies.
- 58. The apparatus as claimed in claim 44, wherein a coded signal is transmitted between the first and second electronic assemblies.
- 59. The apparatus as claimed in claim 58, wherein the codes are orthogonal codes.
- 60. The apparatus as claimed in claim 59, wherein the orthogonal codes are Walsh codes.
- 61. The apparatus as claimed in claim 44, deployed in a base transceiver station.
- 62. A base transceiver station, comprising:
an antenna tower supporting elements in an antenna array; first electronics located proximal to a base of the antenna tower; second electronics located proximal to the antenna array; and at least one transmission path being fewer in number than the number of elements in the antenna array, coupling the first electronics to the second electronics, at least one of said first or second electronics applying codes to at least one data signal to perform a multiplexing of the weights applied to use the elements in the antenna array for beam forming.
- 63. The base station as claimed in claim 62, wherein the first electronics applies the codes to the data signals.
- 64. The base station as claimed in claim 62, wherein the second electronics applies the same codes as the first electronics.
- 65. The base station as claimed in claim 62, wherein weights to apply the beam forming are coded and modulated with a representation of said at least one data signal to be beam formed.
- 66. A method for sampling in a CDMA system, comprising:
modulating at least one RF signal with a code; and for a representation of said at least one coded RF signal, sampling said at least one coded RF signal at a time between modulation transitions.
- 67. The method as claimed in claim 66, further including:
receiving said at least one RF signal across elements of an antenna array; modulating said at least one RF signal with codes associated with and proximal to respective elements; and summing the coded RF signals for sampling.
- 68. The method as claimed in claim 66, wherein the code is an orthogonal code.
- 69. The method as claimed in claim 68, wherein the orthogonal code is a Walsh code.
- 70. The method according to claim 66, deployed in a base transceiver station.
- 71. Apparatus for receiving signals in a radio communication system, comprising:
plural elements forming an antenna array to detect at least one RF signal; and a code generator to apply a code to said at least one given RF signal proximal to a given element to distinguish the given RF signal from among other RF signals received by other elements to apply beam forming to the received RF signals in the radio communication system.
- 72. The apparatus as claimed in claim 71, wherein said code generator applies codes to the signals proximal to the respective elements; and further including:
a summing unit to sum the coded RF signals from the plurality of elements to form a code division multiplexed signal.
- 73. The apparatus as claimed in claim 72, further including an RF-to-baseband converter unit to produce a composite baseband signal corresponding to the code division multiplexed signal.
- 74. The apparatus as claimed in claim 73, wherein the RF-to-baseband converter unit includes:
an automatic gain controller to control the gain of the code division multiplexed signal; a down-converter to convert the RF signal to the code division multiplexed signal at baseband; and an analog-to-digital sampler to sample the code division multiplexed signal.
- 75. The apparatus as claimed in claim 73, further including at least one receiver module having a demodulator to extract the RF signal received by the given element.
- 76. The apparatus as claimed in claim 75, wherein the demodulator multiplies the composite baseband signal by the code applied to the given signal.
- 77. The apparatus as claimed in claim 75, further including a coded weight generator to generate coded weights composed of (i) the code applied to the given signal and (ii) weights to be applied to the received RF signals for performing the beam forming, the coded weights being multiplied by the composite baseband signal.
- 78. The apparatus as claimed in claim 77, further including a summing unit to sum the multiple weighted extracted signals to reconstruct signals producing a spatial beam forming effect.
- 79. The apparatus as claimed in claim 73, further including:
a second code generator to replicate the codes applied to the signals at the elements; a first multiplier to apply weights to the replicated codes; a summing unit to sum the coded weights to form a weighted composite signal; a second multiplier to multiply the received baseband composite signal by the weighted composite signal; a second summing unit to form a single composite signal; and an integrator to integrate the single composite signal over the duration of the code to reconstruct signals producing a spatial beam forming effect.
- 80. The apparatus as claimed in claim 71, wherein the code generator includes a modulator to modulate the code onto the signal; and
further includes a sampler to sample the modulated signal, the timing between the modulator and sampler being locked to avoid sampling modulation-related transitions.
- 81. The apparatus as claimed in claim 71, wherein the codes are orthogonal codes.
- 82. The apparatus as claimed in claim 81, wherein the orthogonal codes are Walsh codes.
- 83. The apparatus as claimed in claim 71, deployed in a base transceiver station.
- 84. Apparatus for receiving signals in a radio communication system, comprising:
a summing unit to form a first code division multiplexed signal composed of codes multiplied by RF signals detected by elements of an antenna array used for beam forming; a coded weight generator to form a second code division multiplexed signal composed of codes multiplied by weights associated with the elements of the antenna array; and a demodulator to decompose the code division multiplexed signal in a beam-forming manner by modulating said first code division multiplexed signal with said second code division multiplexed signal to produce a weighted baseband signal composing the beam forming.
- 85. The apparatus as claimed in claim 84, wherein:
the summing unit forms the first code division multiplexed signals composed of codes multiplied by plural RF signals detected by the elements of the antenna array; and further including:
plural weighted code generators to generate plural second code division multiplexed signals; and plural demodulators to modulate baseband representations of the plural first code division multiplexed signals with the plural second code division multiplexed signals to produce plural weighted baseband signals composing different beams in the beam forming.
- 86. The apparatus as claimed in claim 85, further including plural integration units to integrate the weighted baseband signals over the duration of the codes to determine the content of the RF signals.
- 87. The apparatus as claimed in claim 84, wherein the summing unit is located proximal to the antenna array.
- 88. The apparatus as claimed in claim 87, wherein the weighted code generator is located proximal to the antenna array.
- 89. The apparatus as claimed in claim 87, wherein the weighted code generator is located distal from the antenna.
- 90. The apparatus as claimed in claim 84, wherein the codes used to code the RF signals and weights are the same codes.
- 91. The apparatus as claimed in claim 84, wherein the baseband representation of said first code division multiplexed signal is generated in part by a sampler sampling the coded RF signal, the timing between the sampler and the modulator modulating the RF signal with the codes being locked to avoid sampling modulation-related transitions.
- 92. The apparatus as claimed in claim 84, wherein the codes are orthogonal codes.
- 93. The apparatus as claimed in claim 92, wherein the orthogonal codes are Walsh codes.
- 94. The apparatus as claimed in claim 84, deployed in a base station.
- 95. Apparatus for transmitting RF signals in a radio communication system, comprising:
a coded weight generator to generate weights modulated by codes; and a modulator to modulate the coded weights with a data signal to be transmitted to produce a coded, weighted signal for beam forming.
- 96. The apparatus as claimed in claim 95, further including:
additional modulators to modulate other coded weights, being modulated with the same codes, with other signals to be transmitted to produce respective coded, weighted signals for beam forming; and a summing unit to sum the coded, weighted signals to form a composite code division multiplexed signal.
- 97. The apparatus as claimed in claim 96, further including:
a converter to convert the composite code division multiplexed signal to an analog representation; and an up-converter to up-convert the analog representation to an RF representation of the composite code division multiplexed signal.
- 98. The apparatus as claimed in claim 97, further including, at a given element in an antenna array used for beam forming, a modulator to modulate the RF representation by at least one code to decompose the RF representation into an RF representation comprising weights and signals to be transmitted corresponding to the given element.
- 99. The apparatus as claimed in claim 98, further including, proximal to a subset of elements in the antenna array, respective modulators to modulate the RF representation by the codes to decompose the RF representation into respective subset RF representations having at least one weight and at least one signal to be transmitted corresponding to the respective elements to form at least one beam having a pattern formed by the weights.
- 100. The apparatus as claimed in claim 99, wherein the weights include amplitude information, phase information, or a combination thereof to produce the formed beam.
- 101. The apparatus as claimed in claim 95, wherein the codes are orthogonal codes.
- 102. The apparatus as claimed in claim 101, wherein the orthogonal codes are Walsh codes.
- 103. The apparatus as claimed in claim 95, deployed in a base transceiver station.
- 104. Apparatus for transmitting a signal in a radio communication system, comprising:
a weighted code generator to form a first code division multiplexed signal composed of weighted codes associated with respective elements of an antenna array used for beam forming; a modulator to modulate the first code division multiplexed signal with a modulated data signal to produce a second code division multiplexed signal including both the weights and data for the elements of the antenna array; an up-converter to up-convert the second signal to an RF representation of the second signal; and using the same codes as used to form the first code division multiplexed signal, plural demodulators associated with respective elements of the antenna array to modulate the RF representation with the codes to decompose the RF representation to apply the weights to respective elements of the antenna array for transmitting the RF representation from the antenna array in a beam-forming manner.
- 105. The apparatus as claimed in claim 104, wherein said weighted code generator, modulator, up-converter, and plural demodulators are located proximal to the antenna array.
- 106. The apparatus as claimed in claim 104, wherein said weighted code generator, modulator, and up-converter are located distal from the antenna array.
- 107. The apparatus as claimed in claim 104, further including:
(i) plural transmitter modules having respective weighted code generators and modulators to form plural code division multiplexed signals, including:
(a) respective modulated data signals; (b) respective weighted codes having the same codes but different weights; and (ii) a summing unit to sum the plural code division multiplexed signals to produce a composite code division multiplexed signal.
- 108. The apparatus as claimed in claim 107, wherein the demultiplexers decomposing the RF representation apply the plural code division multiplexed signals to the elements of the antenna array to transmit plural signals from the antenna array in a beam-forming manner simultaneously.
- 109. The apparatus as claimed in claim 104, wherein the up-converter converts the second code division multiplexed signal in a manner absent of converting during code transition times.
- 110. The apparatus as claimed in claim 104, further including transmitter power amplifiers to amplify the RF representation at individual elements.
- 111. The apparatus as claimed in claim 104, wherein the codes are orthogonal codes.
- 112. The apparatus as claimed in claim 111, wherein the orthogonal codes are Walsh codes.
- 113. The apparatus as claimed in claim 104, deployed in a base station.
- 114. A method for beam forming in a radio communication system, comprising:
transceiving at least one respective representation of at least one data signal along fewer transmission paths than the number of elements in an antenna array being used in a beam forming manner; and using the antenna array, transceiving respective RF representations of said at least one data signal to a mobile station in a beam forming manner.
- 115. The method as claimed in claim 114, wherein transceiving said at least one representation uses fiber optic communications techniques.
- 116. The method as claimed in claim 114, wherein transceiving said at least one representation uses RF communications techniques.
- 117. The method as claimed in claim 114, wherein transceiving said at least one representation uses wire-supported communications techniques.
- 118. The method as claimed in claim 114, wherein transceiving said at least one representation uses wireless communications techniques.
- 119. The method as claimed in claim 114, wherein transceiving said at least one representation uses a single transmission path selected from link types composed of: wire, fiber optic, RF cabling, RF wireless or optical wireless.
- 120. The method as claimed in claim 114, further including:
applying a code set to form at least one code division multiplexed signal composed of information corresponding to plural elements of the antenna array; and applying said at least one code set to said at least one code division multiplexed signal to decompose the de-multiplexed signal.
- 121. The method as claimed in claim 120, wherein the code set is applied at least twice proximal to the antenna array.
- 122. The method as claimed in claim 120, wherein the code set is applied at least once proximal to the antenna array and at least once distal from the antenna array.
- 123. The method as claimed in claim 120, further including, for more than one data signal, (i) multiplying each data signal by code division multiplexed weights, where the weights are specific to the respective data signal, and (ii) summing the resulting coded, weighted, data signals together to form a composite code division multiplexed signal.
- 124. The method as claimed in claim 123, wherein the composite code division multiplexed signal is transceived across a single transmission path for accessing the antenna array.
- 125. The method as claimed in claim 120, wherein the codes are orthogonal codes.
- 126. The method as claimed in claim 125, wherein the orthogonal codes are Walsh codes.
- 127. The method as claimed in claim 114, wherein said at least one data signal is uncoded.
- 128. The method as claimed in claim 114, wherein said at least one data signal is coded.
- 129. The method as claimed in claim 128, wherein the codes are orthogonal codes.
- 130. The method as claimed in claim 129, wherein the orthogonal codes are Walsh codes.
- 131. The method as claimed in claim 114, deployed in a base transceiver station.
- 132. A method of using beam forming in a base transceiver station, comprising:
providing an antenna tower having a base and supporting elements in an antenna array distal from the base; processing at least one data signal to apply codes and weights to said at least one data signal to use the elements in the antenna array for beam forming; and transmitting said at least one data signal across at least one transmission path being fewer in number than the number of elements in the antenna array.
- 133. The method as claimed in claim 132, wherein the processing applies the weights to said at least one data signal proximal to the antenna array.
- 134. The method as claimed in claim 132, wherein the processing applies codes twice to the data signals, both times using the same codes.
- 135. The method as claimed in claim 132, wherein the weights to apply the beam forming are coded and modulated with a representation of said at least one data signal to be beam formed.
- 136. Apparatus for sampling in a CDMA system, comprising:
a modulator to modulate at least one RF signal with a code; and a sampler to sample said at least one coded RF signal at a time between modulation transitions.
- 137. The apparatus as claimed in claim 136, further including:
at least one receiver to receive said at least one RF signal across elements of an antenna array; a modulator to modulate said at least one RF signal with codes associated with respective elements; and a summing unit to sum the coded RF signals for sampling.
- 138. The apparatus as claimed in claim 136, wherein the code is an orthogonal code.
- 139. The apparatus as claimed in claim 138, wherein the orthogonal code is a Walsh code.
- 140. The apparatus as claimed in claim 136, deployed in a base transceiver station.
- 141. Apparatus for receiving signals in a radio communication system, comprising:
means for detecting a signal at a given element of plural elements forming an antenna array; and means for applying a code to the signal proximal to the given element to distinguish the signal from among plural signals received by the plural elements to apply beam forming to the received signals in the radio communication system.
- 142. Apparatus for receiving signals in a radio communication system, comprising:
means for forming a first code division multiplexed signal composed of codes multiplied by RF signals detected by elements of an antenna array used for beam forming; means for forming a second code division multiplexed signal composed of coded weights associated with the elements of the antenna array; and means for decomposing the code division multiplexed signal in a beam-forming manner by modulating said first code division multiplexed signal with said second code division multiplexed signal to produce a weighted baseband signal to produce a spatial beam forming effect.
- 143. Apparatus for transmitting RF signals in a radio communication system, comprising:
means for generating weights modulated by codes; and means for modulating the coded weights with a signal to be transmitted to produce a coded, weighted signal for beam forming.
- 144. Apparatus for transmitting a signal in a radio communication system, comprising:
means for forming a first code division multiplexed signal composed of coded weights associated with respective elements of an antenna array used for beam forming; means for modulating the first code division multiplexed signal with a modulated data signal to produce a second code division multiplexed signal including both the weights and data for the elements of the antenna array; means for up-converting the second signal to an RF representation of the second signal; and means for using the same codes as used to form the first code division multiplexed signal, decomposing the RF representation of the second signal to apply the weights to respective elements of the antenna array for transmitting the RF representation from the antenna array in a beam-forming manner.
- 145. Apparatus for sampling in a CDMA system, comprising:
means for modulating at least one RF signal with a code; and for a representation of said at least one coded RF signal, means for sampling said at least one coded RF signal at a time between modulation transitions.
- 146. Apparatus for beam forming in a radio communication system, comprising:
means for transceiving at least one respective representation of at least one data signal along fewer transmission paths than the number of elements in an antenna array being used in a beam forming manner; and using the antenna array, means for transceiving respective RF representations of said at least one data signal to a mobile station in a beam forming manner.
- 147. Apparatus in a base transceiver station, comprising:
means for supporting elements in an antenna array distal from the base on an antenna tower having a base; means for processing at least one data signal to apply codes and weights to said at least one data signal to use the elements in the antenna array for beam forming; and means for transmitting said at least one data signal across at least one transmission path being fewer in number than the number of elements in the antenna array.
RELATED APPLICATION
[0001] This application claims the benefit of U.S. Provisional Application No. 60/184,754, filed on Feb. 24, 2000, entitled “Method and System for Economical Beam Forming in a Radio Communication System,” by Proctor, et al., the entire teachings of which are incorporated herein by reference.
Provisional Applications (1)
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Number |
Date |
Country |
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60184754 |
Feb 2000 |
US |