在CDMA系統(tǒng)中實(shí)現(xiàn)多用戶檢測的障礙函數(shù)下降方向法
BARRIER FUNCTION DESCENT DIRECTION METHOD FOR CDMA MULTI-USER DETECTION
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摘要: 該文提出了在碼分多址(CDMA)系統(tǒng)上實(shí)現(xiàn)多用戶檢測的一種基于障礙函數(shù)下降方向的方法(BMD)。與傳統(tǒng)方法以及神經(jīng)網(wǎng)絡(luò)優(yōu)化算法相比較,作者提出的方法是利用障礙函數(shù)而得到的一個(gè)新的下降方向而不是梯度下降方向。計(jì)算機(jī)模擬表明:這種方法總能找到全局最優(yōu)解,并具有抑制多址干擾和噪聲干擾,對(duì)遠(yuǎn)-近問題不敏感等特點(diǎn)。這為實(shí)現(xiàn)碼分多址系統(tǒng)上的最佳多用戶檢測提供了一條新的途徑。
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關(guān)鍵詞:
- 碼分多址; 多用戶檢測; 障礙函數(shù); 下降方向
Abstract: In this paper, A barrier function descent direction method for implementing CDMA multi-user detection (BMD) is proposed. As compared to conventional detectors and neural network optimal algorithms, the method derives a new descent direction from the barrier function other than the gradient direction. Numerical results show that the method is always able to find the global minimization point. It has many advantages featuring near-far effect resistance, able to suppressing multiple access interference and channel noise, etc. The method paves a new way for realizing optimal multi-user detection in CDMA system. -
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