论文部分内容阅读
9.1 引言在上述各讲的基础上,本讲介绍在数字卫星通信领域中的一个全定制NMOS 集成电路芯片设计实例,即零中频数字化QPSK 解调器的设计。众所周知,在数字传输信道中,由于频率响应或冲击响应不理想,引起符号波形际间的干扰,造成误码率恶化。抑制际间干扰,通常采用均衡技术(包括频域均衡和时域均衡)。但监视和均衡数字信道的特
9.1 INTRODUCTION Based on the above explanations, this lecture introduces the design of a fully custom designed NMOS integrated circuit chip in the field of digital satellite communications, namely the design of a zero-IF digital QPSK demodulator. As we all know, in the digital transmission channel, due to the frequency response or impulse response is not ideal, causing interference between symbolic waveforms, resulting in deterioration of the bit error rate. Interference suppression Interference, usually using equalization techniques (including frequency domain equalization and time domain equalization). But monitoring and balancing digital channels are special