CDMA communication system in which interference removing capabil

Details CDMA communication system in which interference removing capabil CDMA communication system in which interference removing capabil

1995-12-08

1998-03-31

Safourek, Benedict V.

Multiplex communications

Communication over free space

Having a plurality of contiguous regions served by...

370342, 375206, H04B 7216

Patent

active

057346470

ABSTRACT:
There is provided a CDMA communication system in which the number of multiple users can be greatly increased under fast fading circumstances. In a transmitting apparatus, an M-ary digital modulator modulates the m-bit (m.gtoreq.2 and m is an integer) binary digital signal into M-value symbols (M=2.sup.m) prior to the spreading operation by multipliers. In a receiving apparatus, after the despreading operation by an orthogonalizing filter, an M-ary digital demodulator compensates the variation of the phase and amplitude of the carrier of the M-ary modulated signal during the transmission. A decision circuit decides the output of the M-ary digital demodulator. A tap coefficient control circuit calculates orthogonalizing coefficients using the outputs of the subtractors, the outputs of the M-ary digital demodulator, the outputs of receiving filters, and the spreading code. The transmission symbols outputted from the decision circuit are converted into an m-bit signal and then combined into a signal of one sequence.

REFERENCES:
patent: 5488629 (1996-01-01), Takahashi et al.
patent: 5488631 (1996-01-01), Gold et al.
patent: 5544196 (1996-08-01), Tiedemann, Jr. et al.
patent: 5550811 (1996-08-01), Kaku et al.
S. Yoshida, et al., "DS/CDMA Adaptive Interference Canceller on Differential Detection for Fast Fading Channel", IEICE paper, B-11, vol. J77-B-II, No. 11, Nov. 1994, pp. 618-627.
S. Sampei, "Rayleigh Fading Compensation Method for 16QAM MODEM in Digital Land Mobile Radio Systems", IEICE paper, B-11, vol. J72-B-II, No. 1, Jan. 1989, pp. 7-15.

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