Averaging methods for blind multiuser detection in DS/CDMA systems

TitleAveraging methods for blind multiuser detection in DS/CDMA systems
Publication TypeConference Paper
Year of Publication1998
AuthorsKrishnamurthy, V., and K. Lindqvist
Conference NameGlobal Telecommunications Conference, 1998. GLOBECOM 98. The Bridge to Global Integration. IEEE
Pagination3566 -3571 vol.6
Keywordsadaptive signal processing, asymptotic rate of convergence, averaged gradient algorithm, averaging methods, BAG algorithm, blind adaptive code-aided algorithm, blind averaged gradient method, blind multiuser detection, code division multiple access, computational cost, convergence, DS/CDMA systems, gradient methods, interference suppression, multiuser interference, narrow-band interference, signal detection, spread spectrum communication, stochastic gradient methods, stochastic processes, suppression

We present a blind adaptive code-aided algorithm for suppression of multiuser interference (MAI) and narrow-band interference (NBI) in DS/CDMA systems. The algorithm -which we call the BAG algorithm-is based on the concept of accelerating the convergence of stochastic gradient methods by averaging. This ingenious concept of averaging was invented by Polyak-our paper examines its application to interference suppression in DS/CDMA systems. We prove that our averaged gradient algorithm has the same asymptotic rate of convergence as RLS, but at a order of magnitude lower computational cost


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