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In this work we propose an iterative decision feedback with constellation constraints receiver for cloud radio access networks that considers the quantization effect in the fronthaul. The proposed constellation constrained device introduces a number of selected points as candidates for decision feedback interference cancellation. By introducing a reliability checking, a higher degree of freedom is...
This paper focuses on wireless communications between energy prosumers in the smart grid, and explores the application of multiple-input multiple output (MIMO) technology to reduce point-to-point transmission delays, and increase communications reliability. MIMO is a wireless technology for sending and receiving more than one data streams on the same channel at the same time by exploiting multipath...
OFDM is a most attractive fast growing multi-carrier modulation technology enabling high capacity of data transmission over a single path. The major problem in OFDM is its high peak-to-average power ratio with respect to independent subcarrier. Transmitter containing non-linear components distorts the signal due to presence of large PAPR there by increasing the complexity and reducing the efficiency...
This paper aims at characterizing a fundamental limitation on the information constraints required for multi-input networked stabilization. A MIMO communication system is deployed for information exchange between the controller and the plant. The communication system is modeled as a MIMO transceiver, which consists of three parts: an encoder, a MIMO channel consisting of parallel SISO subchannels,...
The objective of this paper is to propose a joint estimation method of temporal and spatial spectrum to be utilized in a cooperative network of mobile and fixed stations and fusion center of cognitive multiple - input - multiple - output (MIMO) radios. Adaptive positioning task can be performed by the computations at fusion center using spatial spectrum information-angle of arrival (AOA) and range...
Within the last years the multiple-input multiple-output (MIMO) technology has revolutionized the optical fiber community. Theoretically, the concept of MIMO is well understood and shows some similarities to wireless MIMO systems. The interference in broadband MIMO systems can be removed by applying a spatio-temporal vector coding (STVC) channel description and using singular value decomposition (SVD)...
Space shift keying (SSK) modulation is a newly emerging transmission technology for multiple-input multiple-output (MIMO) wireless systems. In this paper, we propose a novel high rate transmit diversity assisted space shift keying (HT-SSK) modulation scheme to achieve the transmit diversity gain over SSK system with high spectrum efficiency. We first apply antenna shift method at each time slot to...
It is a practical challenge for wireless communication system designs to achieve both high spectral efficiency and energy efficiency because of the nonlinear effect and inefficiency of power amplifier. In previous work, the power amplifier efficiency is always considered as a constant, but it changes with the output power in reality. In this paper, we talk about the impact of variable power amplifier...
MIMO system is the basic principle of hollow when encoding, and then discussed emphatically in the MIMO system of FSO practical two space-time coding, OSTBC coding with REP coding. Introduces the basic principle of two kinds of coding, and in the case of the known a priori knowledge of channel was deduced BER expression, can be seen from the expression of conditional probability, REP space-time coding...
The problem of channel estimation in multi-cell massive MIMO systems is addressed in this paper. The channels observed different antennas in the same cell have approximately sparsity and common support, and the sparsity and common support properties draw more and more attentions when it comes to the efficient estimation of large number of channels in massive MIMO systems. The short channel coherence...
Interference alignment (IA) effectively improves the capacity of interference channel by overlapping the interference and eliminating at the receivers. At present, most algorithms of the distributed interference alignments design precoder and receiver filter at both transmitters and receivers which causes overhead. This paper presents an improved interference alignment based on minimizing projector...
In this paper, considering the problem of performance loss due to limited feedback in multiuser MIMO downlink systems, a novel limited feedback precoding for multiuser MIMO systems based on array preprocessing is proposed. The maximum SINR criteria is used for selecting optimal codeword from the Grassmannian codebook and perturbation codeword at the receiving, and feedback the Grassmannian precoding...
In multi-user Massive MIMO (M-MIMO) TDD systems, the performance of achievable rates in UL/DL is limited by pilot contamination with the number of BS antennas grows. On the basis of a simplified channel model which allows us to obtain the achievable rates easily, the intercell interference factor is defined as “orthogonality factor” for the first time in this paper. The orthogonality factor is denoted...
In recent years, millimeter wave (mm-wave) wireless communications have attracted considerable research interest. The studies on the capacity of the short-range mm-wave line-of-sight (LoS) multiple-input multiple-output (MIMO) channels mainly base on the measurements and simulations. In this paper, we analytically investigate the capacity of N × 2 short-range LoS MIMO channels at mm-wave frequencies...
This paper explores limited feedback nullforming techniques based on random vector quantization (RVQ) with and without receiver coordination. The availability of receiver coordination affects the type and amount of feedback required to select an appropriate precoding vector. Approximate upper and lower bounds are developed for the mean received power at primary receivers with and without receiver...
Contractive interference functions introduced by Feyzmahdavian et al. is the newest approach in the analysis and design of distributed power control laws. This approach can be extended to several cases of distributed power control. One of the distributed power control scenarios wherein the contractive interference functions have not been employed is the power control in MIMO systems. In this paper,...
Multi-user multiple input and multiple output (MU-MIMO) is one of the key techniques in 3GPP Long-Term Evolution (LTE), which enhances the overall system capacity in the downlink. In order to reduce the effect of inter-user-interference in this system, it is necessary to utilize an efficient detection method at the user equipment (UE) that besides its feasibility at high data rate transmission systems...
In this paper, we consider one of the main disadvantages of Ergodic Interference Alignment, i.e., delay. We propose two methods to solve the open problem of finding the best choice of user sets in order to minimize the delay. With these methods we are able to find the best JAP-B scheme which aims to trade off rate for delay in Ergodic Interference Alignment. First, we provide the solution based on...
An efficient full-rate linear dispersion (LD) code is designed over correlated Rayleigh fading channel. This code is suitable for mobile station in LTE-Advanced system where a code with two antennas and three time slots is required and the orthogonal Alamouti code can not be appUed. For this purpose, we first derive a closed-form formula for the ergodic achievable information rate of an LD coded multi-input...
We study and analyze coverage region for MIMO amplify-and-forward (AF) relay network. We consider the network geometry in which L relays are placed uniformly around the source, and assume that there is no direct link between source and destination. We analyze desired transmission rate with the purpose of maximizing coverage region. Using Monte Carlo simulations the impact of number of transceiver...
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