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The combination of MIMO techniques with OFDM, MIMO-OFDM, is a promising way of achieving high spectral efficiency in wireless communication systems. However, the performance of MIMO-ODFM systems is highly degraded by RF impairments such as phase noise. Similar to the SISO case, phase noise in MIMO-OFDM systems results in a common phase error (CPE) and inter carrier interference (ICI). In this paper...
Two principal transmission techniques have been developed to take advantage of Multiple-Input Multiple-Output (MIMO) systems: Spatial Multiplexing and Diversity Transmission. In this paper we are combining space-time block code (STBC) with spatial multiplexing technique over space to take advantages of both schemes. At the receiver, a minimum mean square error (MMSE) detector with interference cancelation...
This paper proposes a lattice-reduction aided detection (LRAD) based on the Gram-Schmidt (GS) procedure. In MIMO systems, LRAD achieves good bit error ratios (BERs). The proposed detection method reduces the column vectors of the channel matrix using the LLL algorithm and then the GS procedure to create mutually purely orthogonal column vectors in order to improve BER. The proposed detection method...
Training-based estimation of channel state information in multi-antenna systems is analyzed herein. Closed-form expressions for the general Bayesian minimum mean square error (MMSE) estimators of the channel matrix and the squared channel norm are derived in a Rayleigh fading environment with known statistics at the receiver side. When the second-order channel statistics are available also at the...
This paper proposes an improved lattice-reduction aided (LRA) MMSE detection based on the Gram-Schmidt orthogonalization. With the proposed detection, much reliable estimate can be achieved, compared to the conventional LRA detection. The BERs are much closer to those with the ML detection in the 4 times 4 MIMO and the 8 times 8 MIMO systems.
Lattice reduction aided (LRA) detection with the LLL algorithm has been investigated to achieve the MIMO channel capacity with low computational complexity. This paper proposes an improved LRA-MMSE detection using the forward and the backward reduction LLL algorithms for the 8times8 MIMO to obtain more reliable estimates of the transmitted signals. The proposed method achieved much better BERs than...
We study the problem of mean square error (MSE) transceiver design for point-to-multipoint transmission in multiuser multiple-input-multiple-output (MIMO) systems. We focus on four optimization problems: minimizing the maximum weighted layer-wise or user-wise MSE under a total power constraint; minimizing the total transmit power subject to a set of layer-wise or user-wise MSE requirements. The non-convexity...
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