在发送端，主要研究了差错控制编码，波形成形、扩频和8PSK调制等关键技术；
On the sending end, the paper focuses on Error Control Coding, Waveform Shaping, Spread Spectrum and 8PSK modulation, etc.
讨论了数字调制技术中的波形成形问题，提出利用双正交子波实现波形成形的思想。
This paper discusses the technique of waveform coding for digital modulation and presents the idea of waveform coding based on biorthogonal wavelets.
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