Ocean underwater channel is a stochastic acoustic propagation channel with its multipaths, time variety, and frequency spread.
海洋水声信道是多途、时变和频散的信道。
It is a true blind detection algorithm in that it needs no knowledge of channel fading information as well as time domain and frequency domain spread spectrum codes.
该算法无需时域扩频码、频域扩频码和信道衰落信息，是一种真正意义上的盲的检测算法。
Reverse-spread spectrum device, time sequence inspection device, channel evaluation device and method for measuring frequency faults.
逆扩频装置，时序检测装置，信道估计装置和频率误差测量方法。
The generating of pseudo random sequence is one of the key subjects to realize the spread spectrum technique upgrade for BPC low frequency time code radio station.
伪随机序列的产生是实现BPC低频时码发播台扩展频谱技术升级的一个重要环节。
It is first time to adopt the high-speed frequency spread microwave network for China Seismological Bureau.
采用扩频微波方式组网在地震系统还尚属首次。
It is first time to adopt the high-speed frequency spread microwave network for China Seismological Bureau.
采用扩频微波方式组网在地震系统还尚属首次。
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