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Permission-based multiple access communications systems
8374217 Permission-based multiple access communications systems
Patent Drawings:Drawing: 8374217-10    Drawing: 8374217-11    Drawing: 8374217-12    Drawing: 8374217-13    Drawing: 8374217-14    Drawing: 8374217-15    Drawing: 8374217-16    Drawing: 8374217-17    Drawing: 8374217-18    Drawing: 8374217-19    
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Inventor: Michaels, et al.
Date Issued: February 12, 2013
Application:
Filed:
Inventors:
Assignee:
Primary Examiner: File; Erin
Assistant Examiner:
Attorney Or Agent: Fox Rothschild, LLPSacco; Robert J.
U.S. Class: 375/141; 375/130; 375/140
Field Of Search: 375/141
International Class: H04B 1/00
U.S Patent Documents:
Foreign Patent Documents: 0 849 664; 0 949 563; 2 000 900; 2 000 902; 1167272; 7140983; 2001255817; 2004279784; 2005017612; WO-0135572; WO-2006 110954; WO 2008 065191; WO-2008099367; WO-2008130973; WO 2009 146283
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Abstract: Systems (100) and methods (400) for selectively controlling access to multiple data streams which are communicated using a shared frequency spectrum and shared spreading codes. The methods involve generating a first product signal (FPS) by spreading first symbols of a first amplitude modulated (AM) signal using a first spreading code (SC). The methods also involve generating a second product signal (SPS) by spreading second symbols of a complimentary AM signal using a second SC. The FPS (124) and SPS 126 are combined to form a protected data communication signal (PDCS) including first data recoverable by a receiver (106). A global data communication signal (GDCS) is combined with PDCS (128) to form an output signal (140) having a spread spectrum format. The GDCS is generated using a digital modulation process and includes second data recoverable by a plurality of receivers (106, 108).
Claim: We claim:

1. A method for selectively controlling access to multiple data streams which are communicated using a shared frequency spectrum and shared spreading codes, comprising: generating afirst product signal by spreading first symbols of a first amplitude modulated signal using a first spreading code; generating a second product signal by spreading second symbols of a complimentary amplitude modulated signal using a second spreadingcode; combining said first and second product signals to form a protected data communication signal including first data recoverable by at least one receiver of a plurality of receivers; and combining a global data communication signal and saidprotected data communication signal to form an output signal having a spread spectrum format; wherein said global data communication signal is generated using a digital modulation process and includes second data recoverable by all of said plurality ofreceivers.

2. The method according to claim 1, wherein said first and second spreading codes include pseudo-random number sequences.

3. The method according to claim 1, wherein said first and second spreading codes include digitally generated chaotic sequences.

4. The method according to claim 1, wherein said second spreading code is orthogonal or statistically orthogonal to said first spreading code.

5. The method according to claim 1, wherein said digital modulation process includes a phase modulation process.

6. The method according to claim 1, wherein said first and second product signals are additively combined to produce a constant power envelope in said protected data communication signal.

7. The method according to claim 1, further comprising recovering said global data communication signal at a first receiver of said plurality of receivers by de-spreading said output signal using a sum of a third spreading code and a fourthspreading code which are respectively identical to said first spreading code and said second spreading code.

8. The method according to claim 7, further comprising synchronizing in time said first and third spreading codes, and said second and fourth spreading codes.

9. The method according to claim 7, further comprising preventing said first receiver from independently recovering the third spreading code or the fourth spreading code.

10. The method according to claim 1, further comprising recovering said first product signal at a first receiver of said plurality of receivers by de-spreading said output using a third spreading code that is identical to said first spreadingcode.

11. A communication system configured for selectively controlling access to multiple data streams which are communicated using a shared frequency spectrum and shared spreading codes, comprising: a first discrete time amplitude modulatorgenerating a first product signal by spreading first symbols of a first amplitude modulated signal using a first spreading code; a second discrete time amplitude modulator configured for generating a second product signal by spreading second symbols ofa complimentary amplitude modulated signal using a second spreading code; a first combiner configured for combining said first and second product signals to form a protected data communication signal including first data recoverable by at least onereceiver of a plurality of receivers; and a second combiner configured for combining a global data communication signal and said protected data communication signal to form an output signal having a spread spectrum format; wherein said global datacommunication signal is generated using a digital modulation process and includes second data recoverable by all of said plurality of receivers.

12. The communication system according to claim 11, wherein said first and second spreading codes include pseudo-random number sequences.

13. The communication system according to claim 11, wherein said first and second spreading codes include digitally generated chaotic sequences.

14. The communication system according to claim 11, wherein said second spreading code is orthogonal or statistically orthogonal to said first spreading code.

15. The communication system according to claim 11, wherein said digital modulation process includes a phase modulation process.

16. The communication system according to claim 11, wherein said first combiner is further configured for additively combining said first and second product signals to produce a constant power envelope in said protected data communicationsignal.

17. The communication system according to claim 11, further comprising: a transmitter configured for transmitting said output signal to a first receiver of said plurality of receivers; wherein said first receiver is configured for recoveringsaid global data communication signal by de-spreading said output signal using a sum of a third spreading code and a fourth spreading code which are respectively identical to said first spreading code and said second spreading code.

18. The communication system according to claim 17, wherein said first and third spreading codes are synchronized in time and said second and fourth spreading codes are synchronized in time.

19. The communication system according to claim 17, wherein said first receiver is prevented from independently recovering said third spreading code or said fourth spreading code.

20. The communication system according to claim 11, further comprising: a transmitter configured for transmitting said output signal to a first receiver of said plurality of receivers; wherein said first receiver is configured for recoveringsaid first product signal by de-spreading said output using a third spreading code that is identical to said first spreading code.
Description:
 
 
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