一種新的盲空時多用戶接收機(jī)及其改進(jìn)形式
New Blind Space-Time Multiuser Receiver and Its Improved Method
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摘要: 該文對空時多用戶接收機(jī)提出了變步長LMS盲自適應(yīng)算法,該算法提出了一種新的雙誤差函數(shù)來解決系統(tǒng)的約束優(yōu)化問題。進(jìn)一步地,考慮到用戶信號多徑衰落的特點(diǎn),提出一種新標(biāo)準(zhǔn)對目標(biāo)用戶多徑傳輸信號進(jìn)行預(yù)選擇,從而在降低系統(tǒng)的運(yùn)行成本與維持系統(tǒng)的性能之間找到一種新的折衷途徑。仿真結(jié)果證明了上述算法的有效性。
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關(guān)鍵詞:
- 多徑衰落; 多用戶檢測; 空時處理
Abstract: In the paper, a varied step length LMS algorithm is adopted in space-time multiuser receiver, in which a new bierror function is used to solve the constrained optimization problem. Furthermore, based on the character of the users signals in fading channels, a new standard is presented to filter the users signals in advance. The method will reduce the running cost of the system greatly and present a new controllable tread of f means between the system performance and its running cost. The above algorithm is verified by the following simulations. -
Verdu S. Multiuser Detection. Cambridge, UK Cambridge Univ.Press, 1998, chapter 1.[2]Wang Xiaodong, Poor H V. Blind adaptive multiuser detection in multipath CDMA channel based on subspace tracking[J].IEEE Trans. on SP.1998, 46(11):3030-[3]Miller S, Schwartz S C. Integrated spatial-temporal detectors for asynchronous Gaussian multiple access channels. IEEE Trans. on Commun., 1995, COM-43(234): 396 - 411.[4]Wang Xiaodong, Poor H V. Space-time multiuser detection in multipath CDMA channels[J].IEEE Trans. on SP.1999, 47(9):2356-[5]Honing M, Madhow U, Verdu S. Blind adaptive multiuser detection[J].IEEE Trans. on IT.1995, 41(7):944-[6]Xie Z, Short R T, Rushforth C K. A family of suboptimum detectors for coherent multiuser communications[J].IEEE J. on Select. Areas Commun.1990, 8(4):683-[7]Haykin S. Adaptive Filter Theory. Prentice Hall Inc, 1996, chapter 9.[8]Yang B. Projection approximation subspace tracking[J].IEEE Trans. on SP.1995, 43(1):95- -
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