Charlotte Langlais

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This paper presents an architectural solution for a MMSE equalizer of iterative receiver for linearly precoded MIMO systems. Two transmit antennas, two receive antennas, and a preceding size of two were chosen for the linearly precoded MIMO system. Thanks to the orthogonality property of Hadamard matrix that is used for the linear preceding and the(More)
—This paper presents an architecture design and implementation of an iterative receiver for linearly precoded MIMO systems. The receiver is composed of two main elements: an MMSE-IC equalizer and a 64-state MAX-LOG-MAP decoder which exchange soft information through an interleaving scheme. Each block of the architecture was designed to reach a trade off(More)
— Interleave-Division Multiple Access (IDMA) is a multiuser scheme in which chip interleavers are the only means of user separation. The receiver involves a chip-by-chip iterative multiuser detection. Its complexity increases in a linear manner with the number of users, the number of iterations and the number of paths in the case of multipath channels. In(More)
—In this paper, exact diversity-multiplexing trade-off (DMT) at finite signal to noise ratio (SNR) for multiple-input multiple-output (MIMO) systems with dual antennas at the transmitter (2 × Nr) and/or at the receiver (Nt × 2) is derived over Rayleigh fading channels. We derive the outage probability of the mutual information between transmitted and(More)
The development engineer has to face the question of where to place an interleaver in a digital communication system. In this paper we propose to solve this problem according to the channel transmission characteristics in the particular case of turbo-equalization system. Using a state of the art in coded modulations and some simulation results, we deduce(More)
— An improved turbo-equalization process is proposed for linear precoding with iterative decoding. Using recent results in turbo-equalization, we derive the equalization coefficients for an optimized precoding decoder thanks to the SINR criterion. The proposed method keeps a low complexity even with large size precoders and high order modulations.(More)