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针对中国地面数字电视传输标准的嵌入式多业务系统中的存在着较高峰的均比,提出了随机扩展映射的方法,使该系统峰均比大大降低,能够更好地应用于实际环境。该方法通过对映射扩展模块进行随机化改造达到了在不增加额外复杂度的前提下对系统实现改进的目标。通过对峰均比产生原因的深入分析,找到了该方法的理论依据并对其性能进行了深入讨论。系统仿真和测试结果表明:在损失有限误比特率性能的前提下,该方法能够很好地降低系统的峰均比特性。
Aiming at the average ratio of higher peaks in the embedded multiservice system of China terrestrial digital television transmission standard, a method of random extended mapping is proposed, which makes the peak-to-average ratio of the system significantly reduced and can be better applied to the real environment. The method achieves the goal of improving the system without adding extra complexity by randomizing the mapping extension module. Through in-depth analysis of the causes of peak-to-average ratio, the theoretical basis of the method is found and its performance is discussed in depth. The system simulation and test results show that this method can reduce the peak-to-average ratio of the system well under the condition of losing the limited bit error rate performance.