Claims
- 1. A method of transmitting a first spreaded signal having a first bandwidth via a communication system adapted for communicating a second signal of a second bandwidth, the second bandwidth being narrower than the first bandwidth, the method comprising the steps of:
modulating a first data signal with a particular orthogonal code to produce the first spreaded signal having the first bandwidth so that the first spreaded signal is substantially orthogonal to the second signal of the second bandwidth; and, transmitting the first spreaded signal and the second signal simultaneously so that the first bandwidth overlays the second bandwidth.
- 2. The method of claim 1, further comprising the step of transmitting a pilot signal contemporaneously with transmission of the first spreaded signal.
- 3. The method of claim 1, further comprising the step of transmitting a control data signal, associated with a plurality of users on the first bandwidth, on a common control channel using a single Walsh code that is shared by a plurality of users in a TDMA protocol.
- 4. The method of claim 1, further comprising the step of adaptively varying a data transmission rate associated with the first spreaded signal in response to a transmitter power level and a data error rate.
- 5. The method of claim 1, further comprising the step of comparing a message length to a predetermined threshold for message length, and transmitting the message using the spread spectrum access channel of the first bandwidth when the length is less than the predefined threshold.
- 6. The method of claim 1, wherein the first data signal comprises time division multiplexed information from a plurality of users.
- 7. The method of claim 1, wherein the particular orthogonal code is associated with turbo coding.
- 8. The method of claim 1, wherein the modulating step is associated with a CDMA protocol.
- 9. The method of claim 1, wherein the particular orthogonal code is a Walsh code.
- 10. The method of claim 1, wherein a first carrier frequency associated with the first spreaded signal having a first chip rate has a spacing with respect to a second carrier frequency associated with the second signal having a second chip rate, the spacing being either an integer multiple of the ratio of first chip rate to the second chip rate, or an odd multiple of one-half the ratio of the first chip rate to the second chip rate.
RELATED APPLICATIONS
[0001] This application claims priority from U.S. provisional application Serial No. 60/050,884 which was filed on Jun. 26, 1997, and from U.S. provisional application Serial No. 60/052574 which was filed on Jul. 15, 1997.
Provisional Applications (2)
|
Number |
Date |
Country |
|
60050884 |
Jun 1997 |
US |
|
60052574 |
Jul 1997 |
US |
Divisions (1)
|
Number |
Date |
Country |
Parent |
09104467 |
Jun 1998 |
US |
Child |
10192480 |
Jul 2002 |
US |