一種新的MMaryM編碼結構和解調方法
A New MM-aryM Coded Construction and Demodulation Scheme
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摘要: 該文在研究多重準正交擴頻碼組構造方法的基礎上,提出了構造多重準正交擴頻碼組的改進方法,提出了基于位置映射的一種新的調制結構和解調方法.采用新的碼字分組方法和位置映射,將準正交碼字的解調變成正交碼字解調的組合,從而獲得較好的解調性能.分析和仿真表明該方法可以明顯減小接收端的計算復雜度,并且可以提高信息傳送速率,降低誤碼率.Abstract: In this paper, an improved method of constructing multiple quasi-orthogonal spreading codes and a new modulation and demodulation scheme based on position mapping are proposed on the research of methods of constructing multiple quasi-orthogonal codes, using new method of codes grouping and position mapping, and making the demodulating of the quasi-orthogonal branches into the combination of demodulating of orthogonal sequences codes, that will obtain better demodulation performance. Analysis and simulation prove that this scheme can reduce obviously the computer complexity in the receiver side. It will increase transmission speed of information and reduce bit error probability.
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Wen Lin, Zhu Jinkang, Costa E, Weckerle M. M-ary MC CDMA in uplink for next generation mobile communication. IEEE VTC2003 - Fall, Orlando, 2003:2526 - 2530.[2]Cho Joonyoung, Kim Youhan, Cheun Kyungwhoon. A novel frequency-hopping spread-spectrum multiple-access network using M-ary orthogonal Walsh sequence keying[J].IEEE Trans. on Communications.2003, 51 (11):1885-[3]Eshima K, Hase Y, Oomori S, Takahashi F, Kohno R. M-ary UWB system using Walsh codes. IEEE Conference on Ultra Wideband Systems and Technologies. Baltimore, 21- 23 May2002:37 - 40.[4]Rappaport S Theodore. Wireless Communications Principles and Practice (Second Edition). Prentice-Hall PTR, 2002:255 - 350.[5]Shi Z N, Schlegel C. Spread Code Constrution for CDMA[J].IEEE Communications Letters.2003, 7( 1):4- -
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