CDMA communication system with pilot tone control

Details CDMA communication system with pilot tone control CDMA communication system with pilot tone control

1995-08-14

1998-09-15

Pham, Chi H.

Pulse or digital communications

Repeaters

Testing

370342, H04B 169, H04B 1707, H04J 1300, H04J 1304

Patent

active

058090614

ABSTRACT:
A method and apparatus for the control of each mobile station within a Code Division Multiple Access (CDMA) communications network using simple pilot tones generated and controlled by a base station is described that is intended for use with full duplex, point to multipoint communications networks, particularly low mobility, cellular configurations. A pilot tone signal is added to a voice channel transmitted from a base station to a mobile station. The voice and pilot tone signals are further modulated using direct sequence spread spectrum (DSSS) techniques. The pilot tone serves several purposes. It allows the receive hardware to recover a frequency reference based on the DSSS code rate, which is used to synthesize the receiver tuning, generate the DSSS decoding sequence and synchronously demodulate the voice channel at the mobile station. The amplitude of the forward channel pilot tone is used to control the return channel transmit level. The invention implements a combined open and closed loop mechanism. The pilot tone is always present during voice activity detection and allows immediate activation of the voice channel with proper tuning and power level.

REFERENCES:
patent: 5056109 (1991-10-01), Gilhousen et al.
patent: 5093840 (1992-03-01), Schilling
patent: 5103459 (1992-04-01), Gilhousen et al.
patent: 5235615 (1993-08-01), Omura
patent: 5257283 (1993-10-01), Gilhousen et al.
patent: 5265119 (1993-11-01), Gilhousen et al.
patent: 5267262 (1993-11-01), Wheatley, III
patent: 5299226 (1994-03-01), Schilling
patent: 5396516 (1995-03-01), Padovani et al.

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