Title :
Parallel combinatory OFDM signaling
Author :
Frenger, Pål K. ; Svensson, N. Arne B
Author_Institution :
Dept. of Signals & Syst., Chalmers Univ. of Technol., Goteborg, Sweden
fDate :
4/1/1999 12:00:00 AM
Abstract :
A parallel combinatory-orthogonal frequency division multiplexing (PC-OFDM) system is proposed and analyzed. The proposed system selects at each symbol interval a subset of the available subcarriers, and the selected subcarriers are modulated by points from an M-PSK signal constellation, PC-OFDM systems can be designed to have lower peak-to-average power ratio (PAPR), higher bandwidth efficiency, and lower bit error probability on Gaussian channels compared to ordinary OFDM systems. A bit mapping procedure using the Johnson (1993) association, together with a position algorithm for the PSK symbols, is proposed. Good analytical approximations of the BER for PC-OFDM systems are derived for AWGN and Ricean fading channels, and extensive simulation results are presented
Keywords :
AWGN channels; OFDM modulation; Rician channels; error statistics; phase shift keying; telecommunication signalling; AWGN fading channels; BER; Gaussian channels; Johnson association; M-PSK signal constellation; PAPR; PC-OFDM systems; Ricean fading channels; analytical approximations; bandwidth efficiency; bit error probability; bit mapping procedure; orthogonal frequency division multiplexing; parallel combinatory OFDM signaling; peak-to-average power ratio; position algorithm; simulation results; subcarriers; Bandwidth; Bit error rate; Constellation diagram; Error probability; Frequency division multiplexing; Gaussian channels; OFDM modulation; Peak to average power ratio; Phase shift keying; Signal design;
Journal_Title :
Communications, IEEE Transactions on
