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一、序言本文讨论了为加拿大TELESAT时分多址系统而研制的4φ—PSK调制解调器的设计和性能。该调制解调器以分帧方式工作,传输容量为61.248Mb/S。在调制解调器设计中,滤波器的传输特性、相干检测中用的提载电路的性能和比特同步电路的性能是很重要的,因为它们和占用带宽、前置词长度以及传输系统中的比特误码率特性有密切的关系。该系统所需的主要性能,可参见表1.1。
I. Preface This article discusses the design and performance of 4φ-PSK modems developed for the TELESAT TDMA system in Canada. The modem works in framed mode with a transmission capacity of 61.248 Mb / s. In modem design, the transmission characteristics of the filter, the performance of the load circuit used in coherent detection, and the performance of the bit synchronization circuit are important as they relate to the occupied bandwidth, the prefix length, and the bit error rate in the transmission system Rate characteristics are closely related. The main performance required for this system can be found in Table 1.1.