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In this paper, we investigate the effects of asymmetric frequency-dependent joint transmit-receive I/Q imbalance on the performance of beamforming MIMO-OFDM systems. We derive the throughput-maximizing transmit/receive beamforming coefficients taking into account I/Q imbalance effects. In addition, we propose a low-complexity pilot-aided scheme for the estimation of the channel and I/Q imbalance parameters...
Multi-user multiple input multiple output (MU-MIMO) system is an excellent choice for the next generation broadband communications because of its great potential in enhancing MIMO system capacity. One major challenge of such system is the jointly optimal transceiver beamforming design that maximizes the sum capacity under a total power constraint. Existing approaches have provided convex optimization...
In this paper, we consider a dual-hop amplify-and-forward (AF) relay system, where the base station (BS) equipped with multiple antennas communicates with the mobile station (MS) via a relay station (RS). We derive the exact closed-form outage probability for two cases: i) interference only at the MS and ii) interference at both the RS and the MS. It is validated that our analyses agree with the corresponding...
We tackle the problem of determining the beamforming and combining weights in a network of interfering multiple-input multiple-output (MIMO) links. We classify any strategy for computing these weights as either unilateral or bilateral. A unilateral strategy is one for which the responsibility of cancelling interference from one node to another is preassigned to lie solely with only one of the two...
We consider a wireless relay network in which multiple single-antenna users communicate with each other through a multi-antenna relay. With our earlier proposed framework of zero-forcing relaying, the inter-user interferences are canceled. In this paper, we investigate power allocation schemes for both regenerative and non-regenerative relays to improve the throughput performance. Considering different...
Multiple-input multiple-output (MIMO) techniques were recently proposed for HSUPA in 3GPP. In this paper, we show that compared to the baseline non-MIMO transmission, the beam-forming closed loop transmission diversity (CLTD) can provide clear UE Tx power saving but sometimes only little throughput gain. Spatial multiplexing can provide substantial throughput gain while the cost in increased UE Tx...
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