Title :
Orthogonal frequency division multiplexing with phase modulation and constant envelope design
Author :
Tsai, Yingming ; Zhang, Guodong ; Pan, Jung-Lin
Author_Institution :
InterDigital Commun. Corp., Melville, NY
Abstract :
Constant envelope OFDM with phase modulation (CE-OFDM-PM) was proposed. The motivation of the CE-OFDM-PM system is to alleviate the high peak-to-average power ratio of conventional OFDM systems. In this paper, we explore more details of CE-OFDM-PM systems regarding bandwidth efficiency and performance under AWGN and multipath channels. A theoretical approach instead of Carson´s rule to analyze bandwidth is proposed. It indicates that bandwidth requirement is determined by factors such as input data variance and modulation index. The analytical results show that the CE-OFDM-PM systems require the same bandwidth as conventional OFDM system when appropriate (low) modulation index is applied in CE-OFDM-PM system. Under the same multipath channel and bandwidth, the performance of CE-OFDM-PM systems is compared to conventional OFDM system with one tap equalizer. The uncoded BER performance of CE-OFDM-PM is getting close when OFDM applies clipping, but power efficiency of CE-OFDM-PM still outperforms OFDM since clipping cannot eliminate PAPR issue
Keywords :
AWGN channels; OFDM modulation; equalisers; error statistics; multipath channels; phase modulation; AWGN channel; BER; CE-OFDM-PM system; additive white Gaussian noise; bit error rate; clipping; constant envelope design; multipath channel; one tap equalizer; orthogonal frequency division multiplexing; phase modulation; AWGN; Bandwidth; Equalizers; High power amplifiers; Intersymbol interference; Multipath channels; OFDM modulation; Peak to average power ratio; Performance analysis; Phase modulation;
Conference_Titel :
Military Communications Conference, 2005. MILCOM 2005. IEEE
Conference_Location :
Atlantic City, NJ
Print_ISBN :
0-7803-9393-7
DOI :
10.1109/MILCOM.2005.1606068
