... block relay: 闭锁继电器 block system relay: 闭塞系统继电器 Block-relay: 阻尼继电器 ...
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all-relay semiautomatic block system 继电半自动闭塞
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Second, channel estimation algorithms of two-hop OFDM cooperative communication system with single relay are discussed, which are mainly based on block pilot.
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；
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