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Communication system

  • US 20040126088A1
  • Filed: 12/15/2003
  • Published: 07/01/2004
  • Est. Priority Date: 03/26/1992
  • Status: Active Grant
First Claim
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1. A communication system comprising:

  • a transmitter having a signal input means, a modulator means for producing m (m≧

    4) signal points in a signal space diagram expressed at least in a polar coordinate system (r, θ

    ) through modulation of a carrier wave using an input signal fed from the signal input means, and a transmitting means for transmitting a modulated signal modulated in said modulator means, in which said input signal contains a first data stream of n values and a second data stream, said m signal points are divided into n signal point groups, said n values of the first data stream are assigned to specify said n signal point groups respectively, and said second data stream is assigned to specify signal points in each signal point group; and

    a receiver having an input means for reception of said modulated signal transmitted from the transmitter, a demodulating means for demodulating said modulated signal into a multi-level signal representing P signal points in a signal space diagram expressed at least in the polar coordinate system (r, θ

    ), and an output means for outputting a signal demodulated by said demodulating means, in which said P signal points are divided into signal point groups of n values, the first data stream of n values is demodulated so as to be assign to said n values of said signal point groups, and the second data stream of P/n values is demodulated so as to be assigned to P/n signal points of each point group for reconstruction of data of the first and second data streams.

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