| 摘要 |
PROBLEM TO BE SOLVED: To further simplify the circuit configuration of a transmitter and a receiver. SOLUTION: A differential phase encoder 15 of a transmitter 10 applies differential modulation to a phase of each symbol, where a same subcarrier is consecutive in the OFDM system without changing amplitude of the symbol, and the transmittar 10 transmits a multi-value digital modulation signal to a radio channel 1. A receiver 30 receives the multi-value digital modulation signal sent via the radio channel 1, and a differential phase decoder 38 of the receiver 30 demodulates the phase of each consecutive symbol in the same subcarrier and applies coherent processing to the amplitude.
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