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多徑衰落信道中導(dǎo)引輔助二維擴(kuò)頻的導(dǎo)引功率優(yōu)化

邵士海,  唐友喜,  戚驥,  李少謙,  宋立軍

邵士海, 唐友喜, 戚驥, 李少謙, 宋立軍. 多徑衰落信道中導(dǎo)引輔助二維擴(kuò)頻的導(dǎo)引功率優(yōu)化[J]. 電子與信息學(xué)報(bào), 2006, 28(8): 1373-1378.
引用本文: 邵士海, 唐友喜, 戚驥, 李少謙, 宋立軍. 多徑衰落信道中導(dǎo)引輔助二維擴(kuò)頻的導(dǎo)引功率優(yōu)化[J]. 電子與信息學(xué)報(bào), 2006, 28(8): 1373-1378.
Shao Shi-hai, Tang You-xi, Qi ji, Li Shao-qian, Song Li-jun. Analysis and Optimization of Pilot Symbol Assisted Two Dimensional Spread Spectrum Systems in Multi-path Fading Channels[J]. Journal of Electronics & Information Technology, 2006, 28(8): 1373-1378.
Citation: Shao Shi-hai, Tang You-xi, Qi ji, Li Shao-qian, Song Li-jun. Analysis and Optimization of Pilot Symbol Assisted Two Dimensional Spread Spectrum Systems in Multi-path Fading Channels[J]. Journal of Electronics & Information Technology, 2006, 28(8): 1373-1378.

多徑衰落信道中導(dǎo)引輔助二維擴(kuò)頻的導(dǎo)引功率優(yōu)化

Analysis and Optimization of Pilot Symbol Assisted Two Dimensional Spread Spectrum Systems in Multi-path Fading Channels

  • 摘要: 在多徑衰落信道中，針對(duì)BPSK調(diào)制的廣義二維擴(kuò)頻系統(tǒng)，該文分析了導(dǎo)引符號(hào)與數(shù)據(jù)符號(hào)的功率比對(duì)導(dǎo)引輔助相干解調(diào)的誤碼率性能的影響，在系統(tǒng)總的發(fā)射功率一定的條件下，優(yōu)化了導(dǎo)引符號(hào)與數(shù)據(jù)符號(hào)的功率比。結(jié)果表明，分析結(jié)果與仿真結(jié)果相吻合，導(dǎo)引符號(hào)與數(shù)據(jù)符號(hào)功率比的最優(yōu)值是由多徑信道的信噪比、多普勒頻移、多徑時(shí)延、低通濾波器的特性等因素決定的。
    Abstract: This paper investigates the bit error rate performance influence due to variation of the power of the pilots in pilot symbol assisted BPSK modulated general two-dimensional spread spectrum systems in Rayleigh fading propagation environments. Under the circumstance, that the systems total transmitting power is fixed, the pilot to data power ratio is optimized analytically. Simulation results accord with theoretical conclusions, both of which illuminate that the optimum pilot to data power ratio is determined by the parameters of multipath fading channels such as SNR, Doppler frequency and multipath delay. The characteristic of low pass filter also affects the optimum pilot to data power ratio.
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  • Tang Youxi. A column-orthogonal two dimensional spread spectrum technique [A]. 2002 IEEE International Conference on Communications, Circuits and Systems and West Sino Expositions [C]. Chengdu, China, July 2002, vol. 1: 348-352.[2]Xing H, Rinne J. The performance analysis of a two dimensional CDMA system for frequency selective channels [A]. 1998 Global Telecommunications Conference [C]. Sydney, Australia, Nov. 1998, vol. 1: 2537-2542.[3]Xiao L, Liang Q L. A novel MC-2D-CDMA communication systems and its detection methods [A]. 2000 IEEE International Conference on Communications [C]. New Orleans, USA, June 2000, vol. 3: 1223-1227.[4]Cavers J K. Analysis of pilot symbol assisted modulation for Rayleigh fading channels [J].IEEE Trans. on Veh. Technol.1991, 40(11):686-693[5]Schramm P. Analysis and optimization of pilot-channel-assisted BPSK for DS-CDMA systems [J].IEEE Trans. on Commun.1998,46(9):1122-1124[6]Chen Jiming, Tang Youxi, Li Shaoqian. Pilot power allocation for OFDM systems [A]. 2003-Spring IEEE Vehicular Technology Conference [C]. Jeju, Korea, April 2003, vol. 2: 1283-1287.[7]Zheng Kan, Wang WenBo, Yang DaCheng. Analysis and optimization of pilot-channel-assisted QPSK for DS-CDMA systems [A]. Proc. IEEE TENCON 2000 [C]. Kuala Lumpur, Malaysia, Sep. 2000, vol. 1: 311-315.[8]Ana G A, Beatriz B, Miguel C. Parameter optimization and simulated performance of a DVB-T digital television broadcasting system [J].IEEE Trans. on Broadcasting.1998, 44(1):131-138[9]Chang Mingxian, Su Y T. Performance analysis of equalized OFDM systems in Rayleigh fading [J]. IEEE Trans. on WirelessCommun., 2002, l(4): 721-732.[10]Li Y, Cimini L J, Sollenberger R N. Robust channel estimation for OFDM systems with rapid dispersive fading channels [J].IEEE Trans. on Commun.1998, 46(7):902-914[11]Ling F. Coherent detection with reference-symbol based channel estimation for direct sequence CDMA uplink communications [A]. 1993 IEEE Vehicular Technology Conference [C]. Seracucus, NJ, May 1993: 400-403.[12]Proakis J G. Digital Communications [M]. 4th ed., New York: McGraw-Hill, 2001, Appendix C.
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  • 收稿日期:  2004-11-29
  • 修回日期:  2005-06-16
  • 刊出日期:  2006-08-19

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