Code division multiple access mobile communication system

Details Code division multiple access mobile communication system Code division multiple access mobile communication system

1996-09-09

1999-08-24

Nguyen, Chau

Multiplex communications

Communication over free space

Having a plurality of contiguous regions served by...

375200, 375362, H04B 7216

Patent

active

059433299

ABSTRACT:
A code division multiple access (CDMA) mobile communication system with improvements to permit stable reception with a minimum of bit error. The system comprises a voltage-controlled oscillator for supplying a carrier to a radio frequency quadrature demodulator, and a frequency controller for detecting a frequency error from a phase correction signal of the first step to generate a control signal that controls the oscillator. The frequency controller includes an extracting circuit and an integrating circuit. The extracting circuit extracts a phase change based on the frequency error derived from the phase correction signal of the first step and from a signal preceding that signal by a predetermined delay time. The integrating circuit integrates the phase change and outputs the integrated result as the control signal. The predetermined delay time is preferably set within a range not exceeding the delay time needed for averaging by an averaging circuit that receives the phase correction signal of the first step and outputs a phase correction signal. The carrier to a radio frequency quadrature modulator is preferably supplied from the voltage-controlled oscillator.

REFERENCES:
patent: 4485477 (1984-11-01), Nossen
patent: 4856027 (1989-08-01), Nakamura et al.
patent: 5301206 (1994-04-01), Ishigaki et al.
patent: 5361276 (1994-11-01), Subramanian
patent: 5559828 (1996-09-01), Armstrong et al.
patent: 5581582 (1996-12-01), Choi
patent: 5584068 (1996-12-01), Mohindra
patent: 5666352 (1997-09-01), Ohgoshi et al.
"Coherent Detection for CDMA Mobile Communication Systems" by Yasuo Ohgoshi, et al. p. 306, 1994.

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