Communication system, transmitter and receiver

Details Communication system, transmitter and receiver Communication system, transmitter and receiver

1998-03-12

2000-10-24

Bocure, Tesfaldet

Pulse or digital communications

Spread spectrum

375146, 375147, H04K 100

Patent

active

061378259

ABSTRACT:
Differences between two adjacent bits of connection control data are derived in sequence. The derived differences are logically combined with a pilot signal and simultaneously with user data. The logically combined signals are spread to spreading bands and added to each other. The added signal is used as a modulating signal and transmitted through phase shift keying (PSK). Thereafter, the PSK modulated carrier is demodulated to derive the modulating signal. The modulating signal is despread to derive a user signal. The user signal includes the user data and the foregoing differences. The modulating signal is further despread to derive the pilot signal with the foregoing differences included. The pilot signal with the foregoing differences is subjected to a conjugate conversion and then multiplied by the user signal so that the foregoing differences are removed from the user signal to obtain the user data. The connection control data is reconstructed from the foregoing differences included in the pilot signal.

REFERENCES:
patent: 5926500 (1999-07-01), Odenwalder
patent: 5930230 (1999-07-01), Odenwalder et al.
patent: 5943329 (1999-08-01), Ohgoshi et al.
Telecommunications Industry Assoc., TIA/EIA/IS-95, Mobile Station-Base Station Compatibility Standard for Dual-Mode Wideband Spread Spectrum Cellular System, 1993 pp. 6-1-7-41.
Joint Technical Committee, "W-CDMA (Wideband Code Division Multiple Access) Air Interface Compatibility Standard for 1.85 to 1.99 Ghz PCS Application", 1995, pp. 3-1-4-41.

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