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PULSE-SHAPING TECHNIQUES FOR SPACE COMMUNICATIONS

机译：空间通信的脉冲整形技术

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摘要

In recent years, the demand for communication systems that transmit more data through a bandwidth-limited channel is increasing rapidly particularly in space communication. The need for bandwidth-efficient modulation schemes has driven a great deal of research in this area. One such method for bandwidth efficiency is pulse shaping or spectrum shaping. In a multicarrier operation, the problem of interference between carrier spectrums appears. Several modulation techniques for digital transmission have recently been investigated for the purpose of achieving narrow signal spectra with power concentrated within a given bandwidth. While designing a communication system, particularly a satellite communication system, special attention is needed to use the primary resources viz., the transmitted power and channel bandwidth. Space communication links are both bandwidth- and power-limited. The Quadrature Phase Shift Keying (QPSK) modulation scheme is best suited for satellite communication because bandwidth and power required are optimum. In this paper, some observations on QPSK spectral spikes—the methods to eliminate them—as well as pulse-shaping circuits to improve spectrum bandwidth of Bi-Phase Shift Keying (BPSK), QPSK modulation and also a new window function to reduce the side-lobe levels of PSK spectrum are presented. It is observed that the new pulse-shaping circuit is very promising and is being used in the design of communication systems for the forthcoming Geostationary Satellite to be launched in 2004.
机译：近年来，特别是在空间通信中，对通过带宽受限的信道传输更多数据的通信系统的需求正在迅速增长。对带宽有效的调制方案的需求已推动了该领域的大量研究。一种这样的提高带宽效率的方法是脉冲整形或频谱整形。在多载波操作中，出现载波频谱之间的干扰问题。最近已经研究了几种用于数字传输的调制技术，目的是在功率集中在给定带宽内的情况下实现窄信号频谱。在设计通信系统，特别是卫星通信系统时，需要特别注意使用主要资源，即发射功率和信道带宽。空间通信链路是带宽和功率受限的。正交相移键控（QPSK）调制方案最适合卫星通信，因为所需的带宽和功率是最佳的。在本文中，我们对QPSK频谱尖峰进行了一些观察（消除它们的方法），以及用于改善双相移键控（BPSK）频谱带宽的脉冲整形电路，QPSK调制以及一种新的窗函数，以减少噪声。呈现了PSK频谱的波瓣电平。可以看到，新的脉冲整形电路非常有前途，正在用于即将于2004年发射的对地静止卫星通信系统的设计中。

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