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An improved averaged stochastic gradient algorithms for blind multiuser detection in DS/CDMA systems

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3 Author(s)
Hu Yanjun ; Dept. of Electron. Eng. & Inf. Sci., Anhui Univ., Hefei, China ; Huaisong Zhu ; Jinkang Zhu

An improved blind adaptive gradient algorithm (IBAG) for code-aided simultaneous suppression of multiple-access interference (MAI) and narrow-band interference (NBI) in a direct-sequence code-division multiple-access (DS/CDMA) system is proposed. The blind adaptive gradient algorithm (BAG) has two types: tracking blind adaptive gradient algorithm (TBAG), which has the tracking ability, and time-invariant blind adaptive gradient algorithm (TIBAG), which is applied in time-invariant circumstances. We prove that the IBAG algorithm has similar tracking properties to, and the same order of computational cost as, the BAG algorithm, and its output signal-to-interference ratio (SIR) rises more quickly than that of the BAG algorithm at the beginning

Published in:

Vehicular Technology Conference, 2001. VTC 2001 Spring. IEEE VTS 53rd  (Volume:3 )

Date of Conference:

2001