Method and Apparatus For Transmitting and Receiving High Speed Data Using Code Division Multiple Access Channels

• US 20090316761A1
• Filed: 05/26/2009
• Published: 12/24/2009
• Est. Priority Date: 07/10/1998
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Tiedemann, Edward G. JR.
• Granted Patent: US 8,040,936 B2
• Time in Patent Office: Days
• US Class Current: 375/147
• CPC Class Codes: H04B 1/692 Hybrid techniques using combinations of two or more spread spectrum techniques
• CPC Class Codes: H04B 1/707 using direct sequence modulation
• CPC Class Codes: H04B 1/7087 Carrier synchronisation aspects
• CPC Class Codes: H04B 1/713 using frequency hopping
• CPC Class Codes: H04B 1/7136 Arrangements for generation of hop frequencies, e.g. using a bank of frequency sources, using continuous tuning or using a transform
• CPC Class Codes: H04B 2201/70703 using multiple or variable rates
• CPC Class Codes: H04B 7/2628 using code-division multiple access [CDMA] or spread spectrum multiple access [SSMA] H04B7/2618 takes precedence

Abstract

The present invention describes a spread spectrum communication system wherein the frequency of carriers and the code channels of the carriers or both for transmission to a given remote station user vary in time. This provides for a direct sequence spectrum communications system which changes frequency or code channel according to a predetermined pattern. The code channels and frequencies can be determined in accordance with a deterministic function or based upon a subset of the data to be transmitted. A receiver structure is also described for receiving the same.

Claims

1. An apparatus, comprising:

a downconverter configured to downconvert received data using a frequency selected in accordance with a first signal, wherein

the first signal is generated in accordance with a scrambled subset of information bits used by another node for upconverting the received data for transmission.

2. The apparatus of claim 1, wherein the first signal is generated in accordance with a time-delayed version of a second signal, the second signal having a substantially identical frequency to the selected frequency.

3. The apparatus of claim 1, further comprising a demodulator configured to demodulate the downconverted data using a code channel selected in accordance with a code channel selection signal used by the another node for modulating the received data.

4. The apparatus of claim 2, wherein the second signal comprises an output of a variable frequency synthesizer.

5. The apparatus of claim 4, wherein the code channel selection signal is generated in accordance with a scrambled subset of information bits.

6. A remote station, comprising:

an antenna for receiving data; and

a downconverter configured to downconvert the received data using a frequency selected in accordance with a first signal, wherein

the first signal is generated in accordance with a scrambled subset of information bits used by another node for upconverting the received data for transmission.

7. The remote station of claim 6, wherein the first signal is generated in accordance with a time-delayed version of a second signal, the second signal having a substantially identical frequency to the selected frequency

8. The remote station of claim 6, further comprising a demodulator configured to demodulate the downconverted data using a code channel selected in accordance with a code channel selection signal used by another wireless node for modulating the received data.

9. The remote station of claim 8, wherein the code channel selection signal is generated in accordance with a scrambled subset of information bits.

10. A method, comprising:

downconverting received data using a frequency selected in accordance with a first signal, wherein

the first signal is generated in accordance with a scrambled subset of information bits used by another node for upconverting the received data for transmission.

11. The method of claim 10, wherein the first signal is generated in accordance with a time-delayed version of a second signal, the second signal having a substantially identical frequency to the selected frequency.

12. The method of claim 10, further comprising demodulating the downconverted data using a code channel selected in accordance with a code channel selection signal used by the another node for modulating the received data.

13. The method of claim 11, wherein the second signal comprises an output of a variable frequency synthesizer.

14. The method of claim 13, wherein the code channel selection signal is generated in accordance with a scrambled subset of information bits.

15. An apparatus, comprising:

means for downconverting received data using a frequency selected in accordance with a first signal, wherein

the first signal is generated in accordance with a scrambled subset of information bits used by another node for upconverting the received data for transmission.

16. The apparatus of claim 15, wherein the first signal is generated in accordance with a time-delayed version of a second signal, the second signal having a substantially identical frequency to the selected frequency.

17. The apparatus of claim 15, further comprising demodulating the downconverted data using a code channel selected in accordance with a code channel selection signal used by the another node for modulating the received data.

18. The apparatus of claim 16, wherein the second signal comprises an output of a variable frequency synthesizer.

19. The apparatus of claim 18, wherein the code channel selection signal is generated in accordance with a scrambled subset of information bits.

20. A computer program product, comprising:

computer-readable medium comprising;

code for causing a computer to;

downconvert received data using a frequency selected in accordance with a first signal, wherein the first signal is generated in accordance with a scrambled subset of information bits used by another node to upconvert the received data for transmission.

21. The computer program product of claim 20, wherein the first signal is generated in accordance with a time-delayed version of a second signal, the second signal having a substantially identical frequency to the selected frequency.

22. The computer program product of claim 20, further comprising code to demodulate the downconverted data using a code channel selected in accordance with a code channel selection signal used by the another node for modulating the received data.

23. The computer program product of claim 21, wherein the second signal comprises an output of a variable frequency synthesizer.

24. The apparatus of claim 23, wherein the code channel selection signal is generated in accordance with a scrambled subset of information bits.