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In this paper, an alternative jointly optimized transceiver scheme is proposed to reduce the multi-user interference in the distributed antenna system (DAS). First a joint design for the pre-coders and combiners is proposed based on the signal-to-leakage-plus-noise ratio (SLNR) maximization and the receive signal-to-interference-plus-noise ratio (SINR) maximization, respectively. Then a modified weighted...
In this paper we study joint transmitter adaptation and power control in downlink wireless systems with target values imposed on the signal-to-interference+noise-ratios (SINR) at the receiver terminals. We use a general framework based on block transmissions and linear precoders that is applicable to a wide range of wireless systems to formulate this as a constrained optimization problem for which...
We examine the application of transmit precoding in multiuser multi-input-multi-output (MIMO) communication systems with maximum ratio combining (MRC) receivers. In many multiuser applications, the maximum-likelihood or minimum mean-square error (MMSE) receivers can be prohibitive to implement due to their high implementation complexity. We examine the performance of the system with simple MRC receivers...
This paper focuses on the feedback scheme for downlink Multi-User Multiple-Input Multiple-Output (MU-MIMO) transmission with linear precoding. When the maximum transmission rank per user is limited to one, the multiple-antenna receiver uses a weight vector to transform MIMO channel matrix into an equivalent Multiple-Input Single-Output (MISO) channel vector. Then a Channel Directional Index (CDI)...
In this paper, we have discussed the effects of channel interference and evaluated the signal-to-interference plus noise ratio (SINR) for the cognitive radio (CR) network. The cognitive radio is a novel concept of reusing licensed spectrum with unlicensed manner. The most challenging part is the introduction of cognitive radio in the primary user spectrum without causing interference to it. The SINR...
This paper examines linear beamforming methods for secure communications in a multiuser wiretap channel with a single transmitter, multiple legitimate receivers, and a single eavesdropper, where all nodes are equipped with multiple antennas. No information regarding the eavesdropper is presumed at the transmitter, and we examine both the broadcast MIMO downlink with independent information, and the...
Closed loop transmit diversity has already been adopted by 3GPP for MIMO HSDPA in the form of TxAA and its dual stream counterpart, D-TxAA. While both these transmission techniques provide performance gains for single user (SU) scenarios, they both introduce multi-user interference in the downlink in multi-user (MU) scenarios. In this paper, we study the extension of these transmission techniques...
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