基于峰度的盲自適應(yīng)多用戶檢測
Kurtosis-based adaptive multiuser detection
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摘要: 基于四階累積量,分析一種新的優(yōu)化準(zhǔn)則,即定向最小峰度(OMK:Oriented Minimum Kur-tosis)準(zhǔn)則。理論分析表明:該準(zhǔn)則函數(shù)具有全局最小值且極值點(diǎn)滿足解相關(guān)條件。由此,通過求解該優(yōu)化問題,能得到一種新的盲多用戶接收方案。然后,利用最速下降法,給出盲多用戶檢測的自適應(yīng)算法。仿真結(jié)果進(jìn)一步驗(yàn)證了本文的結(jié)論。
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關(guān)鍵詞:
- 碼分多址; 多址干擾; 多用戶檢測; 四階累積量
Abstract: Based on fourth-order cumulants, a new optimizing criterion is discussed and proven to have the global minima, while the minima satisfy the decorrelating conditions. Thereby, a new scheme for the blind multiuser detection can be obtained by solving the optimization problem. Then, an adaptive algorithm for the blind multiuser detection is given using method of the steepest descent. The computer simulation further demonstrates the results. -
M. Honig, U. Mdahow, S. Verdu, Blind adaptive multiuser detection, IEEE Trans. on. IT, 1995.IT-41(4), 944-960.[2]X. Wang, H. V. Poor, Blind multiuser detection, a subspace approach, IEEE Trans. on. IT, 1998,IT-44(2), 677-690.[3]O. Shalvi, E. Weinstein, New criteria for blind deconvolution of nonminimum phase systems (channels), IEEE Trans. on IT, 1990, IT-36(2), 312-321.[4]張賢達(dá),時(shí)間序列分析-高階統(tǒng)計(jì)量方法,北京,清華大學(xué)出版社,1996,第2章. -
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