CDMA mobile communication system and method with improved phase

Details CDMA mobile communication system and method with improved phase CDMA mobile communication system and method with improved phase

1995-07-18

1997-09-09

Hsu, Alpus H.

Multiplex communications

Generalized orthogonal or special mathematical techniques

Quadrature carriers

370335, 375200, H04B 7216, H04J 1302

Patent

active

056663528

ABSTRACT:
A mobile station of a code division multiple access mobile communication system for transmission by carrying out quadrature multiplexing of a pilot signal and a data signal having I and Q components spread by spectrum from the base station to the mobile station, includes a despreading circuit for generating phase error signals (.DELTA.I, .DELTA.Q) by despreading the quadrature multiplexed reception signals (I', Q') by using despreading codes for pilot symbol, another spreading circuit for generating a data signal group by despreading the reception signals by using spreading codes for data symbol, accumulators for converting the transmission rate of the phase error signals and the data signal group into the symbol rate, an averaging circuit for generating phase correction signals from the phase error signals of the symbol rate, and a phase correction circuit for generating data signals (I, Q) with the phase shifts being removed therefrom, by correcting the data signal group by the phase correction signals.

REFERENCES:
"A Study on Demodulation Method for CDMA Mobile Phone" by Hideshi Murai, et al., Spring Symposium of 1994 of the Institute of Electronics, Information and Communication Engineers, A-5 Spread Spectrum, A-288, pp. 1-270 1994.
Proceedings of IEEE VTC 1994, vol. 1, 8-10, Jun. 1994, NY, USA pp. 51-55, Doi, et al. "DS/CDMA prototype system transmitting low bit-rate voice and high bit-rate ISDN signals", right col., line 20--p.53, left col., line 21; Figure 3.

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