Minimum probability of error for asynchronous Gaussian multiple-access channels
IEEE Transactions on Information Theory
Minimum mean squared error equalization using a priori information
IEEE Transactions on Signal Processing
Layered space-time multiuser detection over wireless uplink systems
IEEE Transactions on Wireless Communications
Bandwidth-efficient turbo trellis-coded modulation using punctured component codes
IEEE Journal on Selected Areas in Communications
Iterative receivers for multiuser space-time coding systems
IEEE Journal on Selected Areas in Communications
Performance Analysis of MIMO Based CDMA Code Acquisition Over Rayleigh Fading Channels
Wireless Personal Communications: An International Journal
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In this paper we propose the use of a turbo receiver for the uplink of a MIMO CDMA system employing layered space-time transmission. The proposed receiver consists of a low complexity layered space-time multi-user detector using minimum mean squared error (MMSE) filtering with a-priori information and a bank of MAP SISO decoders. Using the soft estimates from a bank of MAP decoders we obtain soft values of the interfering symbols. The SISO multiuser detector subtracts the vector of the interfering symbols from the incoming signal. The resulting vector is then filtered by an adaptive MMSE filter to reduce the residual MAI. This process iterates by exchanging extrinsic informations between the bank of MAP decoders and the SISO multiuser detector. Turbo Trellis Coded Modulation (TTCM) is used as Forward Error Correcting (FEC) code due to its high bandwidth efficiency. Our computer simulations show that the proposed structure outperforms a classical iterative receiver based on parallel interference cancellation (PIC) as well as a non-iterative MMSE receiver. Furthermore, in a multiuser context, the proposed receiver offers an error performance similar to that of single-user case at high SNR.