Title :
An Initial Value Optimization Least Square Constant Modulus Algorithm for CDMA Systems
Author :
Sheng-Mei Liu ; Qing-Ming Meng ; Su Pan
Author_Institution :
Key Lab. of Wireless Commun., Nanjing Univ. of Posts & Telecommun., Nanjing
Abstract :
An initial value optimization least square constant modulus algorithm (IVO-LSCMA) is presented in this paper. The initial value of IVO-LSCMA is calculated by using the eigenvectors in the signal subspace and it is obtained by the iteration search approach to maximize the SINR(signal to interference plus noise ratio). The noise capture problem of LSCMA when the initial value is selected randomly can be solved by the IVO-LSCMA. It is shown that the IVO-LSCMA can achieve superior detection performance and fast convergence rate and it is also shown more robust performance than the LSCMA when the initial value is selected randomly. Moreover, the effect of the parameter to the algorithm is analyzed.
Keywords :
code division multiple access; eigenvalues and eigenfunctions; least squares approximations; optimisation; CDMA systems; eigenvectors; initial value optimization; iteration search; least square constant modulus; signal subspace; signal to interference plus noise ratio; Convergence; Covariance matrix; Interference suppression; Laboratories; Least squares methods; Mobile communication; Multiaccess communication; Multiuser detection; Signal to noise ratio; Wireless communication;
Conference_Titel :
Wireless Communications, Networking and Mobile Computing, 2008. WiCOM '08. 4th International Conference on
Conference_Location :
Dalian
Print_ISBN :
978-1-4244-2107-7
Electronic_ISBN :
978-1-4244-2108-4
DOI :
10.1109/WiCom.2008.378
