Title :
Downlink Space–Time Spreading Using Interference Rejection Codes
Author :
Wei, Hua ; Yang, Lie-Liang ; Hanzo, Lajos
Author_Institution :
Sch. of Electron. & Comput. Sci., Southampton Univ.
Abstract :
In this paper, the authors will investigate the performance of a loosely synchronized (LS) code-based space-time spreading (STS) scheme in comparison to that of classic Walsh code and pseudonoise code-based STS when communicating over dispersive Nakagami-m multipath channels. Closed-form formulas are derived for characterizing the bit-error-rate performance as a function of the number of resolvable paths L and the number of users K. Our numerical results suggest that the employment of LS code-based STS scheme is beneficial in a low-user-load and low-dispersion channel scenario, where a near-single-user performance can be achieved without a multiuser detector
Keywords :
Nakagami channels; dispersive channels; error statistics; interference suppression; multipath channels; space-time codes; spread spectrum communication; STS; bit-error-rate performance; closed-form formulas; dispersive Nakagami-m multipath channel; interference rejection code; loosely synchronized code; space-time spreading scheme; Delay; Dispersion; Downlink; Employment; Fading; Multiaccess communication; Multipath channels; Multiple access interference; Sociotechnical systems; Transmitting antennas; Code-division multiple access (CDMA); Gaussian approximation; Nakagami-$m$ fading; interference-free window (IFW); large area synchronized (LAS) codes; loosely synchronized (LS) codes;
Journal_Title :
Vehicular Technology, IEEE Transactions on
DOI :
10.1109/TVT.2006.878607
