Study of PAPR Reduction for Uplink Carrier Aggregation Systems in LTE-A

• Main Authors: Chen-yu Wen, 溫振宇
• Other Authors: Li-chung Chang
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/42551513926543802280

碩士 === 國立臺灣科技大學 === 電機工程系 === 102 === In order to obtain higher data rates, require lager bandwidths. Thus, Third Generation Partnership Project Long Term Evolution Advanced (3GPP-LTE-A) proposed carrier aggregation (CA) technology to utilize aggregation of Long Term Evolution (LTE) carrier to enlarge the bandwidth and achieve high data rate. Since SC-FDMA has a low peak to average power ratio (PAPR) characteristic, it has been proposed for the 3GPP-LTE/LTE-A uplink scheme. However, aggregate more carriers not only increases complexity but also raises the PAPR, thus the inherent lower PAPR property of the SC-FDMA does not exist anymore. In addition, combinations of different carriers may have different PAPRs under the same bandwidth aggregation system. In this research, we extend previous analysis to first find out the best PAPR performance by using partial selected mapping (PSLM) scheme from different combinations of component carriers (CCs) in the total aggregated four or five CCs systems with bandwidth 60MHz and 80MHz using three symbol (two data symbol, one reference symbol) optimal interval. We then provide tradeoffs between PAPR and complexity depending on different selection of the optimal interval. Finally, we proposed a scheme to reduce the PAPR with the same performance of the PSLM scheme but it has a lower computational complexity.