Multi-user communication system employing spread signatures

Details Multi-user communication system employing spread signatures Multi-user communication system employing spread signatures

1994-10-11

1996-10-29

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

455 331, H04J 1302

Patent

active

055703518

ABSTRACT:
Transmitting and receiving method and apparatus especially suited to multi-user communication systems such as cellular systems, in which multi-path transmission encounters time-variable fading characteristics in the channel. Pre-coding message stream of symbols by convolution with predetermined signature sequences for respective users enables separation of respective user messages and combats effects of variable fading.

REFERENCES:
patent: 4809295 (1989-02-01), Zscheile, Jr. et al.
patent: 4901307 (1990-02-01), Gilhousen et al.
patent: 5309474 (1994-05-01), Gilhousen et al.
Gregory W. Wornell "Spread-Signature CDMA: Efficient Multiuser Communication in the Presence of Fading" IEEE Transactions on Information Theory vol. 41, No. 5, Sep. 1995 pp. 1418-1438.
John G. Proakis, Digital Communications, 2nd ed., 1989, McGraw-Hill pp. 821-823, 800-807, 362-372, 377-380, 441-451, 728-738, 554-574, 593-602, and 454-459.
Armin Wittneben, IEEE Globecom, 1990, "An Energy-and Bandwidth-Efficient Data-Transmission System for Time-Selective Fading Channels".

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