標題: PAPR Analysis and Mitigation Algorithms for Beamforming MIMO OFDM Systems
作者: Hung, Ying-Che
Tsai, Shang-Ho (Lawrence)
電機工程學系
Department of Electrical and Computer Engineering
關鍵字: MIMO OFDM;beamforming;precoding;peak-to-average power ratio;PAPR;low power;maximum ratio transmission;MRT;equal gain transmission;EGT;extreme value theory;beta distribution
公開日期: 1-五月-2014
摘要: Beamforming (or precoding) techniques have been widely adopted in modern MIMO OFDM systems. Using beamforming can significantly improve the receive SNR of OFDM systems. However, the combination of transmit signals after beamforming deteriorates the peak-to-average power ratio (PAPR), which has long been considered a major issue of OFDM systems. High PAPR not only complicates the design of the power amplifier, but also increases power consumption. In this paper, we theoretically analyze the PAPR performance of MIMO OFDM systems that adopt either one of the two popular beamforming schemes, i.e. MRT (maximum ratio transmission) and EGT (equal gain transmission). The analysis considers different numbers of channel taps after sampling. The results may provide important reference for practical designs when evaluating the required power amplifiers and power consumption. Moreover, the theoretical results show that MRT OFDM systems generally perform much worse than EGT OFDM systems in terms of PAPR. Furthermore, motivated from the derived results, PAPR reduction algorithms are proposed for both MRT OFDM and EGT OFDM systems. It is worth to mention that for MRT OFDM systems, the proposed algorithm can improve both PAPR and bit error rate; for EGT OFDM systems, the proposed algorithm improves PAPR while it only slightly degrades bit error rate.
URI: http://dx.doi.org/10.1109/TWC.2014.031914.130347
http://hdl.handle.net/11536/24725
ISSN: 1536-1276
DOI: 10.1109/TWC.2014.031914.130347
期刊: IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS
Volume: 13
Issue: 5
起始頁: 2588
結束頁: 2600
顯示於類別:期刊論文


文件中的檔案:

  1. 000337967000021.pdf