Title :
A sliding window decorrelating receiver for multiuser DS-CDMA mobile radio networks
Author :
Wijayasuriya, S.S.H. ; Norton, G.H. ; McGeehan, J.P.
Author_Institution :
Centre for Commun. Res., Bristol Univ., UK
fDate :
8/1/1996 12:00:00 AM
Abstract :
We detail the development of a near-far (NF) resistant sliding window decorrelating algorithm (SLWA) that overcomes the near-far problem (NFP) pertaining to the conventional linear correlation receiver (CLCR) and alleviates some of the limitations of the standard decorrelator. The SLWA architecture is extended to incorporate differentially coherent multipath (RAKE) diversity combining techniques and hence achieves simultaneous rejection of multiuser and multipath interference. This paper also presents a novel algorithm for updating the decorrelator coefficients using a fully parallel architecture. We present a mathematical model for the performance of a sliding window scheme, the main contribution of which is the analysis of finite sequence length multipath decorrelation under the practical limitation of incomplete RAKE combining. In addition to numerical results, we present results pertaining to capacity improvements achieved over the CLCR, derived from a simulation of a multiuser direct-sequence code-division multiple-access (DS-CDMA) mobile radio system
Keywords :
code division multiple access; correlation methods; diversity reception; fading; interference suppression; land mobile radio; multipath channels; pseudonoise codes; radio networks; radio receivers; radiofrequency interference; spread spectrum communication; RAKE combining; capacity improvements; conventional linear correlation receiver; decorrelator coefficients; differentially coherent multipath; direct-sequence code-division multiple-access; diversity combining; fading channels; finite sequence length multipath decorrelation; mathematical model; multipath interference rejection; multiuser DS-CDMA mobile radio networks; multiuser interference interference; near-far problem; near-far resistant algorithm; parallel architecture; performance; simulation; sliding window decorrelating receiver; standard decorrelator; Decorrelation; Diversity reception; Interference; Mathematical model; Multiaccess communication; Noise measurement; Parallel architectures; Performance analysis; RAKE receivers; Standards development;
Journal_Title :
Vehicular Technology, IEEE Transactions on