传统的差分空时分组编码(DSTBC)在QPSK调制时存在着信号星座扩展。

The traditional differential space-time block code (DSTBC) suffers from the signal constellation expansion for QPSK modulation.

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本文针对远程水下信道和MFSK调制的特点，提出了一种新的频率分组编码(FGC)方法。

Based on the characters of long rang underwater acoustic channels and MFSK modulation, a new Frequency Group Coding (FGC) method is proposed in this paper.

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发射器一般由指令键、指令编码电路、调制电路、驱动电路、发射电路等几部分组成。

General by the command transmitter key, instruction encoding circuit, modulation circuit, driver circuit, firing circuit, such as a few parts.

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