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 ).

Claims

20 · 2 independent · depth 3

20 granted claims

›1.independentA method for selectively controlling access to multiple data streams which are communicated using a shared frequency spectrum and shared spreading cod…+9

›2.↳ 1The method according to claim 1, wherein said first and second spreading codes include pseudo-random number sequences.d2

›3.↳ 1The method according to claim 1, wherein said first and second spreading codes include digitally generated chaotic sequences.d2

›4.↳ 1The method according to claim 1, wherein said second spreading code is orthogonal or statistically orthogonal to said first spreading code.d2

›5.↳ 1The method according to claim 1, wherein said digital modulation process includes a phase modulation process.d2

›6.↳ 1The method according to claim 1, wherein said first and second product signals are additively combined to produce a constant power envelope in said pr…d2

›7.↳ 1The method according to claim 1, further comprising recovering said global data communication signal at a first receiver of said plurality of receiver…d2+2

›10.↳ 1The method according to claim 1, further comprising recovering said first product signal at a first receiver of said plurality of receivers by de-spre…d2

›11.independentA communication system configured for selectively controlling access to multiple data streams which are communicated using a shared frequency spectrum…+9

›12.↳ 11The communication system according to claim 11, wherein said first and second spreading codes include pseudo-random number sequences.d2

›13.↳ 11The communication system according to claim 11, wherein said first and second spreading codes include digitally generated chaotic sequences.d2

›14.↳ 11The communication system according to claim 11, wherein said second spreading code is orthogonal or statistically orthogonal to said first spreading c…d2

›15.↳ 11The communication system according to claim 11, wherein said digital modulation process includes a phase modulation process.d2

›16.↳ 11The communication system according to claim 11, wherein said first combiner is further configured for additively combining said first and second produ…d2

›17.↳ 11The communication system according to claim 11, further comprising:na transmitter configured for transmitting said output signal to a first receiver o…d2+2

›20.↳ 11The communication system according to claim 11, further comprising:na transmitter configured for transmitting said output signal to a first receiver o…d2

Classifications

4 codes

IPC · International Patent Classification

Section H — Electricity

H04B1/00

USPC · US Patent Classification

375/141375/140375/130

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Type	Document	Date
related publication	US 20110002463 A1	6 Jan 2011

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