采用预失真方案的MF-MSK系统的性能
Performance of MF-MSK Systems with Pre-distortion Schemes
摘要：
在第三代系统中使用的高效RF功率放大器需要线性化，以便在不牺牲效率的情况下减少相邻信道互调失真。数字基带预失真是一种高性价比的功率放大器线性化方法。新的通信服务产生了对高线性高功率放大器（HPA）的需求。行波管放大器（TWTA）在功率效率、尺寸和成本方面继续提供最佳的微波HPA性能，但在线性度方面落后于固态功率放大器（SSAP）。本文提出了一种改善行波管放大器线性度的技术。预失真器（PD）线性化技术的使用被描述为提供可与传统SSPA相比或优于传统SSPA的TWTA性能。基于Saleh的HPA模型的推广，推导了PD格式的特性。本文给出了多频最小频移键控（MF-MSK）在非线性信道中的分析结果。
英文摘要：
Efficient RF power amplifiers used in third generation systems require linearization in order to reduce adjacent channel inter-modulation distortion, without sacrificing efficiency. Digital baseband predistortion is a highly cost-effective way to linearize power amplifiers (PAs). New communications services have created a demand for highly linear high power amplifiers (HPA's). Traveling Wave Tubes Amplifiers (TWTA) continue to offer the best microwave HPA performance in terms of power efficiency, size and cost, but lag behind Solid State Power Amplifiers (SSAP's) in linearity. This paper presents a technique for improving TWTA linearity. The use of predistorter (PD) linearization technique is described to provide TWTA performance comparable or superior to conventional SSPA's. The characteristics of the PD scheme is derived based on the extension of Saleh's model for HPA. The analysis results of Multi-frequency Minimum Shift Keying (MF-MSK) in non-linear channels are presented in this paper.
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