The research of multipath parameter estimation algorithms and accomplishing them with software . to estimate multipath parameters , multipath delays must be estimated by code filtering in advance 信道多徑參數(shù)估計算法的研究和軟件實現(xiàn)在估計多徑參數(shù)時,首先使用碼濾波方法估計出信號的多徑時延。
Firstly , the steering vector of mainpath of desired user is estimated by using code filtering method , then dummy signals are introduced , main lobe of wave is built by using the steering vector of mainpath of desired user and side lobes is constrained by using dummy signals 該方法首先利用碼濾波的方法估計期望用戶主徑的波達(dá)方向,然后引入虛擬信號,利用期望用戶主徑的波達(dá)方向形成波束的主瓣,并利用虛擬信號抑制旁瓣。
In addition , the beamforming techniques for cdma systems are discussed emphatically . the algorithm based on code filtering is deduced in detail theoretically , and the performances such as convergence and bit error rate ( ber ) are simulated . meanwhile , we improve a decision - projected algorithm based on least - mean - square ( lms ) error 論文重點(diǎn)討論了cdma系統(tǒng)的波束形成技術(shù),在理論上詳盡地推導(dǎo)了基于擴(kuò)頻碼濾波的波束形成算法,對其收斂性、誤碼率等進(jìn)行了計算機(jī)仿真;針對基于最小均方( lms )誤差的一種判決映射算法進(jìn)行了改進(jìn)。