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Abstract-In this paper, the problem of designing a linear precoder for Multiple-Input Multiple-Output (MIMO) systems in conjunction with Quadrature Amplitude Modulation (QAM) is addressed. First, a novel and efficient methodology to evaluate the input-output mutual information for a general Multiple-Input Multiple-Output (MIMO) system as well as its corresponding gradients is presented, based on the...
The linear closed-loop MIMO precoding technique employs the channel state information at both sides of the link to optimize various criteria such as the capacity, the mean square error, the mutual information. However, the cost is generally an increased complexity and the theoretical study of such a system can be difficult, i.e. obtain criteria such as the Bit Error Rate or Logarithm of Likelihood...
Massive Multiple-Input and Multiple-Output (MIMO) technology that employs a very large number of antennas at the base station (BS), serves relatively fewer users jointly and simultaneously. Adaptive transmission technique in a large-scale MIMO wireless communication systems, can further enhance the reliability of the transmission links and improve the spectrum efficiency. This paper is based on beam...
Transferred signal power (TSP) is related to radiation properties, orientations of antennas. Vertical and horizontal radiation patterns of a dipole antenna depend on its orientation angles, which is called polarization angle in this work. We investigate its impact on TSP and mutual information of MIMO channel.
Spatial modulation (SM) and space shift keying (SSK) represent transmission methods for low-complexity implementation of multiple-input multiple-output (MIMO) wireless systems in which antenna indices are employed for data transmission. In this paper, we focus our attention on the secrecy behavior of SSK and SM. Using an information-theoretic framework, we derive expressions for the mutual information...
This paper proposes a semi-analytical performance prediction method for an iterative receiver that processes signals arriving through a frequency selective multiple-input multiple-output radio channel. Earlier results provide a distribution of the signal-to-interference-and-noise ratio at the output of a frequency-domain soft-cancellation minimum mean square error equalizer, which is subsequently...
In this work, we propose a novel interference alignment (IA) scheme for two-cell MIMO downlink channels. With this scheme the interference will be aligned to the same directions with the desired signals when the transmitters are sending out the same symbols, otherwise, the interference will be aligned to the orthogonal directions of the desired signals as the traditional IA scheme does. As a result,...
In this paper, the problem of designing a linear precoder for Multiple-Input Multiple-Output (MIMO) systems employing Low-Density Parity-Check (LDPC) codes is addressed under the constraint of minimizing the dependence between the system's receiving branches, thus reducing the relevant transmitter and receiver complexities. Our approach constitutes an interesting generalization of Bit-Interleaved...
Optimal data detection of a linear channel can always be implemented through the Viterbi algorithm (VA). However, in many cases of interest the memory of the channel prohibits application of the VA. A popular and conceptually simple method in this case, studied since the early 70s, is to first filter the received signal in order to shorten the memory of the channel, and then to apply a VA that operates...
We study the theoretical performance of a full-duplex multiple-input multiple-output (MIMO) bi-directional communication system. We focus on the effect of the residual self-interference due to channel estimation errors and transmitter impairments. We assume that the instantaneous channel state information (CSI) at the transmitting nodes is not known and the CSI at the receiving nodes is imperfect...
This paper investigates the design of a 2 × 2 optimal space-time block code (SBTC) for a multi-input multi-output (MIMO) system using the mutual information between the finite-alphabet input and the channel output as a main design criterion over Rayleigh fading channels. Different from the STBC design methods using PEP analysis usually seen in the literature that are valid only at high SNRs, our design...
Multiple Input Multiple Output (MIMO) antenna technology has emerged as an effective technique for significantly improving the capacity of wireless communication systems. Multi-carrier modulation scheme can achieve high data rate in frequency-selective fading channels. Orthogonal Frequency Division Multiplexing (OFDM) may be combined with antenna arrays at transmitter and receiver to increase the...
This paper presents a HARQ model in LTE system level simulation capable of reliably predicting the block error ratio improvement. Our model is based on the Mutual Information Effective SINR Mapping (MIESM) which is usually used as the link-to-System (L2S) interface and both SISO and MIMO transmission mode are supported. In addition, taking the rate matching, soft combining into account, the model...
A low complexity precoding method is proposed for practical multiple-input multiple-output (MIMO) systems. Based on the two-step optimal precoder design algorithm that maximizes the lower bound of the mutual information with finite-alphabet inputs, the proposed method simplifies the precoder design by fixing the right singular vectors of the precoder matrix to be the modulation diversity matrix, eliminating...
Most of the recent wireless communication systems are interference limited rather than noise limited. In the case of a very strong interferer the conventional assumption of the interference as Gaussian is extremely suboptimal. However optimal (capacity achieving) receivers utilize some prior knowledge about the interference to reach optimality. The link abstraction for such receiver structures is...
This paper investigates the linear precoder design that maximizes the average mutual information of multiple-input multiple-output channels with finite-alphabet inputs and statistical channel state information known at the transmitter. This linear precoder design is an important open problem and is extremely difficult to solve: First, average mutual information lacks closed-form expression and involves...
Single carrier frequency division multiple access has been adopted as uplink multiple access scheme for next generation cellular system. This paper deals with the closed loop transmission for Long Term Evolution-Advanced (LTE-A) uplink. In the uplink, the feedback for support of uplink data transmission consists of rank indicator (RI), precoding matrix indicator (PMI) and channel quality indicator...
In this paper we investigate MIMO spatial multiplexing transmission over slowly time-variant, block-static fading channels with linear receivers. The system can adapt the transmission rate per spatial layer based on outdated channel state information. Two approximate low complexity approaches, based on the log-transformed post equalization SINR, are presented to adjust the transmission rate adaptively...
This paper addresses the optimization of the linear precoder of a relay shared between several source/destination links interfering one with the others, in the aim of reaching fairness between users. The sources are not aware of the relay existence, and the destinations behave as in a relay channel with interference. Thus, the destinations do not try to decode other sources' messages and the relay...
In this paper mutual information maximizing linear precoding for MIMO transmission using finite signal alphabets and a parallel layer MIMO detection scheme is derived. The derivation exploits that the mutual information of the parallel detection scheme can be expressed in terms of the mutual information associated with optimal maximum likelihood detection. Results show that the large performance gap...
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