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在非协作通信中,发送端的滚降系数对于接收方是未知的。为了能够对接收信号进行正确解调,接收方必须从观测数据中估计出这个参数。因此研究滚降系数误差对QAM系统的影响,具有重要意义。文中仿真分析了在接收端无处理和采用符号定时恢复两种情况下根升余弦滤波器滚降系数不匹配对接收性能的影响,测试结果表明此影响很小,在未知发端滚降系数的情况下,收端滚降系数设置为0.5～0.7,对接收性能的影响最小。这一结论在非协作通信中具有重要意义。
In non-cooperative communication, the sender’s roll-off coefficient is unknown to the receiver. In order to be able to correctly demodulate the received signal, the receiver must estimate this parameter from the observed data. Therefore, it is significant to study the influence of roll-off coefficient error on QAM system. In the paper, the influence of the root-mean-cased cosine filter roll-off coefficient mismatch on the receiving performance under the condition of no processing at the receiving end and symbolic timing recovery is simulated and analyzed. The test results show that this effect is very small. When the roll-off coefficient of the unknown origin is unknown , The receive-end roll-off factor is set to 0.5 ~ 0.7, which has the least impact on the receiving performance. This conclusion is of great importance in non-cooperative communications.