Joint Reduction of PeaktoAverage Power Ratio, （联合PeaktoAverage功率比的减少,）.pdfVIP

IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY, VOL. 60, NO. 9, NOVEMBER 2011 4363 Joint Reduction of Peak-to-Average Power Ratio, Cubic Metric, and Block Error Rate in OFDM Systems Using Network Coding Ronny Yongho Kim, Senior Member, IEEE, Young Yong Kim, Member, IEEE , Amin Alamdar Yazdi, Student Member, IEEE, Sameh Sorour, Student Member, IEEE, and Shahrokh Valaee, Senior Member, IEEE Abstract—The reductions of peak-to-average power ratio evolve toward, including digital video broadcasting [2], IEEE (PAPR) and block error rate (BLER) are two challenges in wire- 802.11 [3], IEEE 802.16 [4], and 3rd Generation Partnership less systems employing orthogonal frequency-division multiplex- Project (3GPP) Long Term Evolution (LTE) [5] standards. ing (OFDM)/orthogonal frequency-division multiple access. High BLER renders the system unreliable, and high PAPR is associated Multicarrier modulation, such as orthogonal frequency-division with power inefficiency and nonlinearity of the system. These two multiplexing (OFDM), is a well-known modulation scheme issues have separately been studied in the literature, but few works that has proven its efficiency in reliable data communications. have studied simultaneous reductions of PAPR and BLER. In this Like any other technique, OFDM encounters some challenges, paper, we propose a new scheme to jointly reduce and tradeoff one of which is its high peak-to-average power ratio (PAPR). PAPR and BLER in OFDM systems using random network coding (NC). In our proposed scheme, different representations of the High PAPR requires a large power backoff in the tran