Patent ID: 7362813

Claim:
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.