Title :
A Frequency Domain Multi-User Detector for TD-CDMA Systems
Author :
Xuezhi Yang ; Vucetic, Branka
Author_Institution :
Dept. of Corp. Res., Huawei Technol. Co., Ltd., Shengzhen, China
fDate :
9/1/2011 12:00:00 AM
Abstract :
In this paper, a novel frequency domain multi-user detector is proposed for a time division-code division multiple access (TD-CDMA) up-link. Unlike conventional frequency domain detectors, the proposed detector first transforms the system matrix of TD-CDMA systems into a circulant matrix by cyclic truncation. It subsequently uses a new method to convert the circulant matrix into a frequency domain block diagonalized matrix through discrete Fourier transforms and permutations. Therefore, the proposed detector can utilize the channel frequency domain coherence to further decrease its computational complexity with a controlled performance loss. Moreover, a novel approach is proposed to calculate the frequency domain correlation matrix and matched filter. With the help of this novel approach, the proposed detector expresses significant complexity advantage over other frequency domain detectors for a real TD-CDMA system in a short-time-dispersive channel.
Keywords :
code division multiple access; discrete Fourier transforms; frequency-domain analysis; matched filters; matrix algebra; multiuser detection; time division multiple access; TD-CDMA system; channel frequency domain; circulant matrix; conventional frequency domain detectors; cyclic truncation; discrete Fourier transforms; frequency domain block diagonalized matrix; frequency domain multiuser detector; matched filter; permutations; short-time-dispersive channel; time division-code division multiple access up-link; Complexity theory; Detectors; Discrete Fourier transforms; Frequency domain analysis; Matrix converters; Multiaccess communication; Multiuser detection; Cholesky decomposition; Frequency domain multi-user detection; TD-CDMA; discrete Fourier transform;
Journal_Title :
Communications, IEEE Transactions on
DOI :
10.1109/TCOMM.2011.062111.090546