The most popular technique used for high data rate services in 4G scenario is MIMO-OFDM. Space-time block codes have been recommended for high diversity gain in MIMO communication systems. Due to comparatively simpler design and less decoding complexity orthogonal STBCs are very attractive. In this paper, we propose a novel adaptive companding method for peak to average power ratio reduction in IEEE 802.16 standards used in 4G wireless mobile communications with orthogonal space time block coded MIMO-OFDM systems. This is obtained by fixing compander parameters independently for statistically unrelated symbols in OFDM waveform and according to the features of input symbols. The bit error rate performance analysis of the proposed system under Rayleigh fading MIMO channel conditions has also been presented. Simulation results showed that the proposed method performs better for a given PAPR preset value and a slight improvement in the BER performance was observed over fixed compander.

中文翻译：

---

无线移动通信系统中自适应压扩器的性能

在4G场景中用于高数据速率服务的最流行技术是MIMO-OFDM。已建议空时分组码用于MIMO通信系统中的高分集增益。由于比较简单的设计和较少的解码复杂度，正交STBC非常具有吸引力。在本文中，我们提出了一种新的自适应压扩方法，用于在具有正交空时分组编码MIMO-OFDM系统的4G无线移动通信中使用的IEEE 802.16标准中降低峰均功率比。这是通过为OFDM波形中统计上不相关的符号并根据输入符号的特征独立地固定压缩扩展器参数而获得的。还提出了在瑞利衰落MIMO信道条件下所提出系统的误码率性能分析。