在脉冲相位键控(PPK)再入遥测系统中，除了传输常规遥测信号外，还要传输特种遥测信号，即单次宽脉冲信号。

Telemetry signals, which are not only convention but also a special type-single wide-pulse ones, are transmitted by the pulse Phase Key (PPK) Reent rant Telemetry system.

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同时运用线性调频脉冲帧同步法，改善了基于差分相移键控的水声数字通信系统的性能。

With the LFM pulse frame synchronization method, the performance of UWA communication system based on DPSK is apparently improved.

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分析了超宽带冲激无线电的脉位调制、通断键控调制和脉冲幅度调制的信号模型。

The ultra wideband (UWB) radio models have been introduced with pulse-position-modulation (PPM), on-off-keying (OOK) and pulse-amplitude-modulation (PAM).

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