其次，讨论了两跳单中继多载波协同通信系统的信道估计的问题，主要是基于辅助块状导频的方法；
Second, channel estimation algorithms of two-hop OFDM cooperative communication system with single relay are discussed, which are mainly based on block pilot.
针对水声通信网单信道MAC协议时延长、吞吐量低、数据冲突频繁的缺点，提出了水声通信网的载波侦听双信道mac协议。
As the large delay, low throughput and frequent data collision in single-channel underwater acoustic networks, this paper devises a dual-channel MAC protocol based on carrier-sense.
针对水声通信网单信道MAC协议时延长、吞吐量低、数据冲突频繁的缺点，提出了水声通信网的载波侦听双信道mac协议。
As the large delay, low throughput and frequent data collision in single-channel underwater acoustic networks, this paper devises a dual-channel MAC protocol based on carrier-sense.
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