Patent ID: 7352822

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 first 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 data for demodulation 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 modulated according to an n-level PSK or an n-level QAM, wherein the data for demodulation includes information representing the value of n; and a demodulator operable to demodulate the first downlink signal to produce the data for demodulation and demodulate the second downlink signal to produce the second data stream, wherein the second data stream is produced according to the data for demodulation; wherein a data rate of the second downlink signal is changeable.