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Communication system

  • US 7,894,541 B2
  • Filed: 10/31/2007
  • Issued: 02/22/2011
  • Est. Priority Date: 03/26/1992
  • Status: Expired due to Fees
First Claim
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1. A receiving and transmission method for receiving an up-link signal from a telephone and transmitting a first down-link signal and a second down-link signal to the telephone as a down-link signal, comprising:

  • when the up-link signal is transmitted from the telephone to a base station;

    receiving the up-link signal, wherein the up-link signal has information of a first data stream, the first data stream is modulated according to a QPSK; and

    demodulating the up-link signal to produce the first data stream;

    when the down-link signal is transmitted from the base station to the telephone;

    scrambling a second data stream to produce a scrambled second data stream;

    a first error correction code (ECC) encoding step for ECC encoding a data stream to produce an ECC encoded first data stream;

    a second error correction code (ECC) encoding step for ECC encoding the scrambled second data stream to produce an ECC encoded second data stream;

    wherein a scheme of the first ECC encoding step is different from a scheme of the second ECC encoding step, and wherein the second error correction code is changeable;

    modulating the ECC encoded first data stream according to a QPSK to produce a first modulated signal and modulating the ECC encoded second data stream according to an n-level PSK or an n-level QAM to produce a second modulated signal, wherein the data stream includes information representing the value of n; and

    transmitting the first modulated signal as the first down-link signal and transmitting the second modulated signal as the second down-link signal.

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