采用QPSK調(diào)制的導(dǎo)頻輔助CDMA系統(tǒng)的分析和優(yōu)化
ANALYSIS AND OPTIMIZATION OF PILOT-CHANNEL-ASSISTED QPSK FOR DS-CDMA SYSTEMS
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摘要: 該文分析了有導(dǎo)頻輔助的采用QPSK調(diào)制方式的直擴(kuò)(DS-CDMA)系統(tǒng),計(jì)算出由于信道估測的不精確而造成的系統(tǒng)性能的損失,并由此得到了數(shù)據(jù)信道功率和導(dǎo)頻信道功率的最佳比及相應(yīng)的系統(tǒng)誤碼率。最后給出仿真結(jié)果。
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關(guān)鍵詞:
- 碼分多址; 導(dǎo)頻輔助; 信道估測; CDMA2000
Abstract: In this paper, the pilot-channel-assisted QPSK in direct-sequence code-division multiple-access (DS-CDMA) system is investigated. The performance loss due to imperfect channel estimation is calculated. Then the data-to-pilot channel power ratio is optimized analytically and the probability is presented. Finally, simulation results are given. -
TIA/EIA/CDMA2000, The CDMA 2000 ITU-R Candidate Submission, August, 1998.[2]F. Ling.[J].Coherent detection with reference-symbol based channel estimation for direct sequence CDMA uplink communications, Proc. VTC93, NJ, USA.1993,:-[3]A. Papoulis, Probability, Random Variables, and Stochastic Processes, New York, McGraw-Hill,1965, Chapter 5.[4]John G Proakis,Digital Communications,3rd,北京,電子工業(yè)出版社,Appendix C. -
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