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OFDM系統(tǒng)中PSAM M-QAM的導(dǎo)引符號(hào)功率的優(yōu)化

陳繼明,  唐友喜,  李少謙

陳繼明, 唐友喜, 李少謙. OFDM系統(tǒng)中PSAM M-QAM的導(dǎo)引符號(hào)功率的優(yōu)化[J]. 電子與信息學(xué)報(bào), 2006, 28(4): 698-702.
引用本文: 陳繼明, 唐友喜, 李少謙. OFDM系統(tǒng)中PSAM M-QAM的導(dǎo)引符號(hào)功率的優(yōu)化[J]. 電子與信息學(xué)報(bào), 2006, 28(4): 698-702.
Chen Ji-ming, Tang You-xi, Li Shao-qian. Analysis and Optimization of Pilot-Symbol-Assisted- Modulation M-QAM for OFDM Systems[J]. Journal of Electronics & Information Technology, 2006, 28(4): 698-702.
Citation: Chen Ji-ming, Tang You-xi, Li Shao-qian. Analysis and Optimization of Pilot-Symbol-Assisted- Modulation M-QAM for OFDM Systems[J]. Journal of Electronics & Information Technology, 2006, 28(4): 698-702.

OFDM系統(tǒng)中PSAM M-QAM的導(dǎo)引符號(hào)功率的優(yōu)化

Analysis and Optimization of Pilot-Symbol-Assisted- Modulation M-QAM for OFDM Systems

  • 摘要: 該文分析了多徑衰落信道下OFDM系統(tǒng)中導(dǎo)引符號(hào)輔助相干解調(diào)(PASM)M-QAM的導(dǎo)引符號(hào)功率對(duì)解調(diào)性能的影響，優(yōu)化了導(dǎo)引符號(hào)與數(shù)據(jù)符號(hào)功率比，計(jì)算了不精確信道估計(jì)造成性能的損失。分析和仿真結(jié)果表明，最優(yōu)導(dǎo)引符號(hào)功率與數(shù)據(jù)符號(hào)的功率之比由信噪比、多普勒頻率和內(nèi)插濾波器系數(shù)等因素決定。當(dāng)采用最優(yōu)的比值時(shí)，為達(dá)到相同的誤比特率，所需的發(fā)射總功率最低。
    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 effected by the Signal-to-Noise Ratio (SNR), Doppler frequency and interpolation size etc. When the optimization parameter of PDR is used, the power of system transmission is the minimum but the same bit error rate (BER) is obtained.
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  • Cimini L J. Analysis and simulation of a digital mobile channel using orthogonal division multiplexing [J]. IEEE Trans. on Commun., 1985, 33(6): 665675. .[2]Schramm P. Analysis and optimization of pilot-channel-assisted BPSK for DS-CDMA systems [J].IEEE Trans. on Commum.1998, 46(9):1122-[3]Zheng K, Wang W B, Yang D C. Analysis and optimization of pilot-channel-assisted QPSK for DS-CDMA systems [C]. Tencon 2000 Proceedings, Malaysia, 2000, 1: 311.315.[4]Thompson J S, Damian D, Bevan N. Pilot power allocation for CDMA systems with antenna arrays [C]. Sensor Array and Multichannel Signal Processing Workshop. Proceedings of IEEE, 2000, 16-17: 424428. .[5]Armada A G, Bardon B, Calvo M. Parameter optimization and simulated performance of a DVB-T digital television broadcasting system [J]. IEEE Trans. on Broadcasting, 1998, 44(1): 131137. .[6]Stuber G L. Principles of mobile communication [M]. 2nd edition, Norwell, MA: Kluwer Academic Publisher, 2000, Ch. 2.[7]Russell M, Stuber G L. Interchannel interference analysis ofOFDM in a mobile environment [C]. IEEE VTC, Chicago, 1995, 2: 820.824.[8]Santella G. Bit error rate performance of M-QAM orthogonal multicarrier modulation in presence of time-selective multipath fading. IEEE ICC, Seattle, WA, 1995, 2: 830834. .[9]James K C. An analysis of pilot symbol assisted modulation for Rayleigh fading channels [J].IEEE Trans. on Veh. Technol.1991, 40(11):686-[10]Tang X, Alouini M S, Goldsmith A. Effect of channel estimation error on M-QAM BER performance in Rayleigh fading [J]. IEEE Trans. on Commun., 1999, 47(12): 18561864. .[11]Webb W T, Hanzo L. Modern Quadrature Amplitude Modulation [M]. Piscataway, NJ: IEEE, 1994, Ch. 10.
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  • 收稿日期:  2004-08-30
  • 修回日期:  2005-02-16
  • 刊出日期:  2006-04-19

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