It is especially attractive for the downlinks and suppressing intercell mai . when multiuser detector is adapted in blind mode , it usually adopts eignvalue decomposition or singularvalue decomposition of received sample correlation matrix and tracking alrithgms , which result in high computational complexity . at the same time , approximation computation in tracking alrithgms also result in slow convergence 為實現(xiàn)盲自適應檢測,通常采用對接收信號樣本矩陣進行特征值分解( evd )或奇異值分解( svd )后進行跟蹤,由此帶來的子空間秩跟蹤使得實現(xiàn)復雜度很高;另一方面,在跟蹤算法中考慮一些實際情況而作出近似處理,從而引起誤差積累和正交性誤差,導致每次跟蹤開始階段跟蹤速度變慢。