Radio transmission systems

HELECTRICITY H04Electric communication H04BTRANSMISSION

H04B7/00Radio transmission systems

H04B7/002Reducing depolarization effects H04B7/005Control of transmission Equalising H04B7/01Reducing phase shift H04B7/015Reducing echo effects H04B7/02Diversity systems H04B7/022Site diversity H04B7/024Cooperative use of antennas of several nodes H04B7/026Cooperative diversity H04B7/028Spatial transmit diversity using a single antenna at the transmitter H04B7/04using a plurality of spaced independent aerials H04B7/0404the mobile station comprising multiple antennas ( H04B7/0408using a plurality of beams H04B7/0413Multiple input multiple output [MIMO] systems H04B7/0417Feedback systems H04B7/0421utilizing implicit feedback H04B7/0426Power distribution aspects H04B7/043using best eigenmode H04B7/0434using multiple eigenmodes H04B7/0439utilizing channel inversion H04B7/0443utilizing "waterfilling" technique H04B7/0447utilizing uniform distribution H04B7/0452Multiple user MIMO systems H04B7/0456Selection of precoding matrix or codebook H04B7/046taking physical layer constraints into account H04B7/0465taking power constraints at power amplifier or emission constraints H04B7/0469taking special antenna structures H04B7/0473taking constraints in layer or codeword to antenna mapping into account H04B7/0478Special codebook structures directed to feedback optimization H04B7/0482Adaptive codebooks H04B7/0486taking channel rank into account H04B7/0491using a plurality of sectors H04B7/0495using overlapping sectors in the same base station to implement MIMO antennas H04B7/06at transmitting station H04B7/0602using antenna switching H04B7/0604with predefined switching scheme H04B7/0606Random or pseudo-random switching scheme H04B7/0608Antenna selection according to transmission parameters H04B7/061using feedback from receiving side H04B7/0613using simultaneous transmission H04B7/0615of weighted versions of same signal H04B7/0617for beam forming H04B7/0619using feedback from receiving side H04B7/0621Feedback content H04B7/0623Auxiliary parameters H04B7/0626Channel coefficients H04B7/0628Diversity capabilities H04B7/063Parameters other than those covered in groups H04B7/0623 - H04B7/0634 H04B7/0632Channel quality parameters H04B7/0634Antenna weights or vector/matrix coefficients H04B7/0636Feedback format H04B7/0639Using selective indices H04B7/0641Differential feedback H04B7/0643Feedback on request H04B7/0645Variable feedback H04B7/0647Variable feedback rate H04B7/065Variable contents H04B7/0652Feedback error handling H04B7/0654at the receiver H04B7/0656at the transmitter H04B7/0658Feedback reduction H04B7/066Combined feedback for a number of channels H04B7/0663using vector or matrix manipulations H04B7/0665Feed forward of transmit weights to the receiver H04B7/0667of delayed versions of same signal H04B7/0669using different channel coding between antennas H04B7/0671using different delays between antennas H04B7/0673using feedback from receiving side H04B7/0676using random or pseudo-random delays H04B7/0678using different spreading codes between antennas H04B7/068using space frequency diversity H04B7/0682using phase diversity ( H04B7/0684using different training sequences per antenna H04B7/0686Hybrid systems H04B7/0689using different transmission schemes, at least one of them being a diversity transmission scheme H04B7/0691using subgroups of transmit antennas H04B7/0693switching off a diversity branch H04B7/0695using beam selection H04B7/0697using spatial multiplexing H04B7/08at receiving station H04B7/0802using antenna selection H04B7/0805with single receiver and antenna switching H04B7/0808comparing all antennas before reception H04B7/0811during preamble or gap period H04B7/0814based on current reception conditions H04B7/0817with multiple receivers and antenna path selection H04B7/082selecting best antenna path H04B7/0822according to predefined selection scheme H04B7/0825with main and with auxiliary or diversity antennas H04B7/0828with delay elements in antenna paths H04B7/0831Compensation of the diversity switching process for non-uniform properties or faulty operations of the switches used in the diversity switching process H04B7/0834based on external parameters H04B7/0837using pre-detection combining H04B7/084Equal gain combining, only phase adjustments H04B7/0842Weighted combining H04B7/0845per branch equalization H04B7/0848Joint weighting H04B7/0851using training sequences or error signal H04B7/0854using error minimizing algorithms H04B7/0857using maximum ratio combining techniques H04B7/086using weights depending on external parameters H04B7/0862receiver computing weights based on information from the transmitter H04B7/0865Independent weighting H04B7/0868Hybrid systems H04B7/0871using different reception schemes, at least one of them being a diversity reception scheme H04B7/0874using subgroups of receive antennas H04B7/0877switching off a diversity branch H04B7/088using beam selection H04B7/0882using post-detection diversity H04B7/0885with combination H04B7/0888with selection H04B7/0891Space-time diversity H04B7/0894using different delays between antennas H04B7/0897using beamforming per multi-path H04B7/10using a single aerial system characterised by its polarisation or directive properties H04B7/12Frequency-diversity systems H04B7/14Relay systems H04B7/145Passive relay systems H04B7/15Active relay systems H04B7/155Ground-based stations H04B7/15507Relay station based processing for cell extension or control of coverage area H04B7/15514for shadowing compensation H04B7/15521combining by calculations packets received from different stations before transmitting the combined packets as part of network coding H04B7/15528Control of operation parameters of a relay station to exploit the physical medium H04B7/15535Control of relay amplifier gain H04B7/15542Selecting at relay station its transmit and receive resources H04B7/1555Selecting relay station antenna mode H04B7/15557Selecting relay station operation mode H04B7/15564Relay station antennae loop interference reduction H04B7/15571by signal isolation H04B7/15578by gain adjustment H04B7/15585by interference cancellation H04B7/15592Adapting at the relay station communication parameters for supporting cooperative relaying H04B7/165employing angle modulation H04B7/17employing pulse modulation H04B7/185Space-based or airborne stations; Stations for satellite systems H04B7/18502Airborne stations H04B7/18504Aircraft used as relay or high altitude atmospheric platform H04B7/18506Communications with or from aircraft H04B7/18508with satellite system used as relay H04B7/1851Systems using a satellite or space-based relay H04B7/18513Transmission in a satellite or space-based system H04B7/18515Transmission equipment in satellites or space-based relays H04B7/18517Transmission equipment in earth stations H04B7/18519Operations control, administration or maintenance H04B7/18521Systems of inter linked satellites H04B7/18523Satellite systems for providing broadcast service to terrestrial stations H04B7/18526Arrangements for data linking, networking or transporting, or for controlling an end to end session H04B7/18528Satellite systems for providing two-way communications service to a network of fixed stations H04B7/1853Satellite systems for providing telephony service to a mobile station H04B7/18532Arrangements for managing transmission H04B7/18534for enhancing link reliablility H04B7/18536Shadowing compensation therefor H04B7/18539Arrangements for managing radio, resources H04B7/18541for handover of resources H04B7/18543for adaptation of transmission parameters H04B7/18545Arrangements for managing station mobility H04B7/18547for geolocalisation of a station H04B7/1855using a telephonic control signal H04B7/18552using a telephonic control signal and a second ranging satellite H04B7/18554using the position provided by an existing geolocalisation system H04B7/18556using a location database H04B7/18558Arrangements for managing communications H04B7/1856for call routing H04B7/18563Arrangements for interconnecting multiple systems H04B7/18565Arrangements for preventing unauthorised access or for providing user protection H04B7/18567Arrangements for providing additional services to the basic mobile satellite telephony service H04B7/18569Arrangements for system physical machines management H04B7/18571for satellites; for fixed or mobile stations H04B7/18573for operations control, administration or maintenance H04B7/18576Satellite systems for providing narrowband data service to fixed or mobile stations H04B7/18578Satellite systems for providing broadband data service to individual earth stations H04B7/1858Arrangements for data transmission on the physical system H04B7/18582Arrangements for data linking H04B7/18584Arrangements for data networking H04B7/18586Arrangements for data transporting H04B7/18589Arrangements for controlling an end to end session H04B7/18591Arrangements for interconnecting multiple systems H04B7/18593Arrangements for preventing unauthorised access or for providing user protection H04B7/18595Arrangements for adapting broadband applications to satellite systems H04B7/18597Arrangements for system physical machines management H04B7/19Earth-synchronous stations H04B7/195Non-synchronous stations H04B7/204Multiple access H04B7/2041Spot beam multiple access H04B7/2043Mixed mode, TDM and FDM systems H04B7/2045SS-FDMA, FDMA satellite switching H04B7/2046SS-TDMA, TDMA satellite switching H04B7/2048Frame structure, synchronisation or frame acquisition in SS-TDMA systems H04B7/208Frequency-division multiple access [FDMA] H04B7/212Time-division multiple access [TDMA] H04B7/2121Channels assignment to the different stations H04B7/2123Variable assignment H04B7/2125Synchronisation H04B7/2126using a reference station H04B7/2128Changing of the reference station H04B7/216Code division or spread-spectrum multiple access H04B7/22Scatter propagation systems H04B7/24for communication between two or more posts H04B7/26at least one of which is mobile H04B7/2603Arrangements for wireless physical layer control H04B7/2606Arrangements for base station coverage control H04B7/2609Arrangements for range control H04B7/2612Arrangements for wireless medium access control H04B7/2615using hybrid frequency-time division multiple access [FDMA-TDMA] H04B7/2618using hybrid code-time division multiple access [CDMA-TDMA] H04B7/2621using frequency division multiple access [FDMA] H04B7/2625using common wave H04B7/2628using code-division multiple access [CDMA] or spread spectrum multiple access [SSMA] H04B7/2631for broadband transmission H04B7/2634for channel frequency control H04B7/2637for logical channel control H04B7/264for data rate control H04B7/2643using time-division multiple access [TDMA] H04B7/2646for broadband transmission H04B7/265for channel frequency control H04B7/2653for logical channel control H04B7/2656for structure of frame, burst H04B7/2659for data rate control H04B7/2662Arrangements for Wireless System Synchronisation H04B7/2665Arrangements for Wireless Frequency Division Multiple Access [FDMA] System Synchronisation H04B7/2668Arrangements for Wireless Code-Division Multiple Access [CDMA] System Synchronisation H04B7/2671Arrangements for Wireless Time-Division Multiple Access [TDMA] System Synchronisation H04B7/2675Frequency synchronisation H04B7/2678Time synchronisation H04B7/2681Synchronisation of a mobile station with one base station H04B7/2684Synchronisation of a mobile station with more than one base station H04B7/2687Inter base stations synchronisation H04B7/269Master/slave synchronisation H04B7/2693Centralised synchronisation, i.e. using external universal time reference H04B7/2696Over the air autonomous synchronisation