| 摘要 |
PROBLEM TO BE SOLVED: To provide a receiver and a method for receiving and processing a series of symbols transmitted in a digital communication system utilizing soft pilot symbols.SOLUTION: Since the remaining symbols in a series are modulated by a high-order modulation method of 16QAM, 64QAM, or the like, and soft pilot symbols are modulated by a lower-order modulation method of BPSK, QPSK, or the like, a soft pilot symbol set is transmitted with reliability higher than that of the remaining symbols in a series. A modulation system and a position (time/frequency/code) of the soft pilot symbol set are known for a receiver, and the receiver demodulates the soft pilot symbol at first, and uses as a known symbol thus estimating parameters of a received wireless signal. The soft pilot carries data furthermore. In addition, the soft pilot is especially useful for establishing an amplitude reference essential for demodulation of higher-order modulation symbols. |
