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We study the design of linear precoders for maximization of the mutual information in MIMO systems with arbitrary constellations and with perfect channel state information at the transmitter. We derive the structure of the optimum precoder and we show that the mutual information is concave in a quadratic function of the precoder coefficients. An iterative algorithm is also proposed to find this optimum...
A two-hop decode-and-forward relay system is considered, which consists of one source, one destination and K relay stations and all the nodes are deployed with multiple antennas. The capacity expressions in the two hops are analyzed and the maximal capacity expressions when signal-to-noise ratio is sufficiently small and sufficiently large are deduced respectively. Based on the capacity expressions,...
This paper studies two-user MIMO interference channel with isotropic fading. We assume that users are equipped with arbitrary number of antennas and the channel state information (CSI) is available at receivers only. An outer bound is obtained for the degree of freedom region, which suggests the loss of degrees of freedom due to the lack of CSI at transmitters under many circumstances.
In 3GPP long term evolution (LTE) uplink, single transmit antenna is adopted due to its simplicity and acceptable performance. However, in order to satisfy the higher requirement of LTE-Advanced (LTE-A) on uplink spectrum efficiency, multiple transmit antennas must be supported in LTE-A uplink. At the same time, the backwards compatibility to LTE should be taken into considerations. Therefore, the...
Many memory-intensive algorithms can actually be designed to parallel realizations through constructing the memory hierarchy. Base on this thought, we disassemble the K-shortest paths/K-nearest-neighbors (KSP/KNN) problem to small subproblems and use Yen's method to treat with each subproblem, therefore derive a new method to resolve the KSP/KNN problem, which can easily be realized in parallel computing...
MIMO is the key technology in LTE system. The performance of MIMO technology is dependent on the antenna configuration and the environment. This paper has given the system level performance evaluation, and the application suggestion of MIMO configuration in outdoor environment is proposed.
In this paper, we propose an extended semidefinite-relaxation (SDR) method for multiple-input multiple-output (MIMO) detection of high-order QAM signals. In the proposed method, high-order QAM constellations are represented by an equivalent virtually-antipodal form. Based on this form, the alphabet relaxation components in the existing SDR formulation can be constrained to the original alphabet set...
The semiconductor (or IC for integrated circuit) temperature sensor is an electronic device fabricated in a similar way to other modern electronic semiconductor components such as microprocessors, diode, transistors, capacitors and etc. There are few temperature sensors being used in nowadays i.e diode type and threshold voltage (VT) extractor type. Normally hundreds or thousands of devices are formed...
MPC (Model Predictive Control) based on linear models is an extensively used methodology in the industrial field as a control solution for MIMO processes. The identification of ARX models for multivariable systems from input-output data often requires the use of LVMs (Latent Variable Methods) such as PCR (Principal Components Regression) or PLS (Partial Least Squares) due to the so called ldquocurse...
A novel multiple-input multiple-output (MIMO) hybrid automatic retransmission request (HARQ) scheme using a different MIMO mode retransmission, called lower rate retransmission (LRR) scheme, is proposed in this paper. A MIMO mode with a higher diversity order than the initial transmission is used for retransmission to enhance the performance. The performance of LRR scheme has been investigated via...
This note presents a filter design for a large class of multiple-input-multiple-output(MIMO) nonlinear uncertain stochastic systems with time-delay. A high-gain filer is proposed such that the dynamics of the estimation error is guaranteed to be stochastically exponentially ultimately bounded in the mean square (Yaz & Azemi, 1993; Zakai, 1967). For easiness of implementation and calibration, the...
A block matrix inversion is a tool that is useful in areas of control, estimation theory and signal processing. However, one of two diagonal entries of the block matrices should be at least invertible to accomplish the conventional block matrix inversion. This paper shows that this assumption is partially released by offering new form of symbolic block matrix inversion. Though the suggested block...
In this paper, we present a simple method to design the best 4-PSK space-time trellis codes (STTCs) for any number of transmit antennas. This method called ldquocoset partitioningrdquo is based on the set partitioning proposed by Ungerboeck for the multiple input multiple output (MIMO) systems. Thanks to this method, an exhaustive search is no more required to find the best codes. Thus, new 4-PSK...
This paper deals with blind source separation (BSS) with time-varying MIMO (multiple input multiple output) channels in interception and diversity context (Alamouti code). A new algorithm based on an adaptive analytical multimodulus algorithm (MMA) is proposed and called adaptive-AMMA. An analytical method, which converges quickly, is necessary with time varying channels. Performances obtained with...
In this study, we consider Multi-user MISO systems based on Max-rate Limited Feedback Transmit Beamforming with B feedback bits. In the proposed idea, the Beamforming codebook {Wi}i=1N (N=2B) is divided into nD sub codebooks, such as D1,D2,..,DnD. At each channel use, the transmitter switches to a given sub-codebook adaptively to the user owning the worst case performance. Accordingly, the proposed...
Current Alamouti's reception scheme for multiple input multiple output (MIMO) communication systems may fail to work when strong interferences exist in the MIMO channel. This paper analyzes and compares three reception schemes for MIMO systems using orthogonal space-time block codes (OSTBCs) suffered directional interferences. These schemes include conventional maximum likelihood decoding (MLD) scheme,...
Coordinating transmission techniques by multiple base stations or radio access points have recently attracted a lot of attention because of its potential for inter-cell co-channel interference mitigation and spectral efficiency significant improvement. This paper explicitly presents network multi-point coordinating downlink transmission technologies, especially discusses the clustered supercell configuration...
Keyhole channels generally characterize rank-efficient MIMO channels, which were predicted theoretically and also observed experimentally. In this paper, we present error rate performance analysis of orthogonal space-time block codes (STBCs) in correlated keyhole multiple-input multiple-output (MIMO) channels, which is not only suitable for exponential correlation models, but also for constant correlation...
By interpolating between communication theory and synergetics, we provide a bridge to connect the two kinds of subjects. As applications, the capacity formula of multiple input and multiple output (MIMO) Gaussian channels is derived by using the Fokker-Planck Equation of the synergetics, it is in accordance with the Telatar's capacity and gives a physical explanation of the observed channel characteristics...
In this paper we propose non-regenerative multi-carrier multiple-input multiple-output (MIMO) relay techniques that minimize the mean-squared error (MSE) of the signal waveform estimation. We establish the closed-form optimal precoding matrices at the source and relay nodes in the absence of the direct source-destination link. Interestingly, we show that the proposed precoding matrices jointly convert...
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