Title :
Analysis and optimization of pilot-symbol-assisted-modulation M-QAM for OFDM systems
Author :
Chen, Jiming ; Tang, Youxi ; Li, Shoanqian
Author_Institution :
Nat. Key Lab. of Commun., Univ. of Electron. Sci. & Technol. of China, Chengdu, China
Abstract :
In this paper, the current analysis focuses on the influence of demodulation performance in multipath fading propagation environments, which results from the pilot power variation of pilot symbol assisted modulation (PSAM) M-QAM in orthogonal frequency division multiplexing (OFDM) systems. The pilot-to-data power ratio (PDR) is optimized analytically, and the loss due to imperfect channel estimation is calculated. Theoretical and simulation results show that the optimum PDR is affected by the signal-to-noise ratio (SNR), Doppler frequency and interpolation size etc. When the optimization parameter of PDR is used, the power of the system transmission is minimum while still meeting a fixed bit error rate (BER) target.
Keywords :
OFDM modulation; channel estimation; demodulation; error statistics; fading channels; multipath channels; optimisation; quadrature amplitude modulation; BER; Doppler frequency; M quadrature amplitude modulation; OFDM systems; bit error rate; demodulation performance; imperfect channel estimation; interpolation size; multipath fading propagation environments; optimization; orthogonal frequency division multiplexing; pilot-symbol-assisted-modulation M-QAM; pilot-to-data power ratio; signal-to-noise ratio; Bit error rate; Channel estimation; Data communication; Demodulation; Fading; Land mobile radio; Multiaccess communication; OFDM modulation; Performance analysis; Signal to noise ratio;
Conference_Titel :
Personal, Indoor and Mobile Radio Communications, 2003. PIMRC 2003. 14th IEEE Proceedings on
Print_ISBN :
0-7803-7822-9
DOI :
10.1109/PIMRC.2003.1260281
