...模型#192．3．2@pseudo-deterministic实测模型#222．4@高频数字通信系统#232．4．1@传统SSB调制#242．4．2@ 时频调制系统 ( TFSK )#242．4．3@短波跳频频移键控系统(FH／FSK)#242．4．4@相关跳频增强扩频系统(CHESS)#252．4．5@短波自适应数字传输系统#252．5@...
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同时在OFDM调制时可以采用M - QAM映射方式，提高短波跳频系统的信息传输速率。
At the same time, M-QAM mapping can be used in OFDM for improving data transportation speed.
基于OFDM(正交频分复用)系统，提出了一种新的空频时三维编码，将网格编码调制和差分空时分组码进行组合链接设计。
Based on OFDM system, a novel space-frequency-time code which combined trellis-coded modulation with differential space-time block code was proposed.
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