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Communication system

  • US 7,362,813 B2
  • Filed: 10/30/2003
  • Issued: 04/22/2008
  • Est. Priority Date: 03/26/1992
  • Status: Expired due to Fees
First Claim
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1. A telephone for transmitting an uplink signal to a base station and receiving a first downlink signal and a second downlink signal from the base station, comprising:

  • a modulator operable to modulate a data stream according to a QPSK to produce a modulated signal;

    a transmitter operable to transmit the modulated signal as the uplink signal;

    a receiver operable to receive the first downlink signal and the second downlink signal, wherein the first downlink signal has information of a first data stream and the second downlink signal has information of a second data stream, the first downlink signal is modulated according to a QPSK and the second downlink signal is scrambled and modulated according to an n-level QAM or an n-level PSK, wherein the first data stream includes information representing the value of n;

    a descrambler operable to descramble the second downlink signal to produce a descrambled second downlink signal;

    a demodulator operable to demodulate the first downlink signal to produce a demodulated first data stream and demodulate the descrambled second downlink signal to produce a demodulated second data stream, wherein the demodulated second data stream is produced according to the value of n;

    a first error correction code (ECC) decoder operable to ECC decode the demodulated first data stream to produce the first data stream; and

    a second error correction code (ECC decoder operable to ECC decode the demodulated second data stream to produce the second data stream;

    wherein a coding scheme of the first ECC decoder is different from a coding scheme of the second ECC decoder, and wherein a second error correction code rate is changeable.

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