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正交频分复用 (OFDM )系统具有有效抗码间串扰、频谱效率高、可以提供高速率数据传输等优点 ,在第三代移动通信系统 (3G)中具有良好的发展前景。但是 ,OFDM信号峰平比比较高 ,影响到功放的效率 ,这已经成为正交频分复用系统实用化的一大障碍。本文提出了一种有效降低正交频分复用信号峰平比的方法。它基于将格雷互补序列应用于正交频分复用通信系统 ,以降低信号的峰平比 ,对于任意载波数OFDM多载波信号 ,其峰平比可降至不大于 6dB。本文还提供了一种用DSP实现的方法
The Orthogonal Frequency Division Multiplexing (OFDM) system has the advantages of effective anti-code crosstalk, high spectrum efficiency and high rate data transmission, and has good development prospect in the third generation mobile communication system (3G). However, the OFDM signal has a higher peak-to-peak ratio, which affects the power amplifier efficiency. This has become a major obstacle to the practical application of Orthogonal Frequency Division Multiplexing (OFDM) systems. This paper presents a method to effectively reduce the Orthogonal Frequency Division Multiplexing signal to peak ratio. It is based on the application of the Gray complementary sequence to Orthogonal Frequency Division Multiplexing (OFDM) communication system to reduce the signal-to-peak ratio. The peak-to-average ratio can be reduced to no more than 6dB for any carrier OFDM multi-carrier signal. This article also provides a way to achieve with DSP