Title :
Frequency domain channel estimation for asynchronous CDMA signals
Author :
Tang, Xin ; Bar-Ness, Yeheskel
Author_Institution :
Dept. of Electr. & Comput. Eng., New Jersey Inst. of Technol., Newark, NJ, USA
Abstract :
Channel estimation, particularly delay estimation in asynchronous CDMA channel, is essential for most receivers. The correlated time domain data sequence will become asymptotically uncorrelated in the frequency domain. By taking the discrete Fourier transform (DFT) of the received signals, we can take advantage of this asymptotical property to simplify the estimation algorithm. The proposed scheme can jointly estimate the path delay and the complex channel response with lower computational complexity. Even with such a simplified channel estimation, performance results are shown to be better
Keywords :
Rayleigh channels; code division multiple access; delay estimation; discrete Fourier transforms; frequency-domain analysis; land mobile radio; maximum likelihood estimation; radio receivers; synchronisation; time-varying channels; DFT; asymptotic property; asynchronous CDMA signals; complex channel response; computational complexity; correlated time domain data sequence; delay estimation; discrete Fourier transform; estimation algorithm; frequency domain channel estimation; path delay; receivers; Channel estimation; Computational complexity; Delay estimation; Discrete Fourier transforms; Fading; Frequency domain analysis; Multiaccess communication; Multiuser detection; Phase estimation; Propagation delay;
Conference_Titel :
Communications, 2001. ICC 2001. IEEE International Conference on
Conference_Location :
Helsinki
Print_ISBN :
0-7803-7097-1
DOI :
10.1109/ICC.2001.936603
