Multiplex communications – Communication over free space – Combining or distributing information via code word channels...
Patent
1996-11-27
1999-05-11
Pham, Chi H.
Multiplex communications
Communication over free space
Combining or distributing information via code word channels...
375200, 375229, 370335, H04B7/216;15/00
Patent
active
059035560
ABSTRACT:
In a code multiplexing communication system, a transmission apparatus includes a code generator, a signal distribution unit, spreading units, a synthesizer, and a modulator, and a reception apparatus includes a correlator, an equalizer, demodulators, and a coupler. The code generator generates n spreading code series which are generated at timings different from the timing of a predetermined spreading code. The signal distribution unit divides a serial input signal having n.times.m bits per symbol timing into n parallel signals each consisting of m bits. The spreading units respectively spectrum-spread the n m-bit output signals by using the n output signals from code generator. The synthesizer synthesizes the output signals from the spreading units. The modulator modulates the output signal from the synthesizer. The correlator calculates the correlation between a baseband signal and the spreading code. The equalizer removes a delay distortion caused by a radio transmission path from the output signal from the correlator, and separates the signal into n signals. The demodulators respectively demodulate the n output signals from the equalizer and extract m-bit parallel signals. The coupler synthesizes the m-bit output signals from the demodulators and outputs a serial signal.
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NEC Corporation
Nguyen Steven
Pham Chi H.
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