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In this work, the repeated game model with unequal discount factors is utilized to understand how the players' behavior affect the system performance in a decode-and-forward cooperative communication system. Unlike previous work, in which all free-ridings are illegal, we differentiate the free-riding into the legal free-riding (LFR) and the illegal one (IFR). Taking LFR and IFR into account, the conditions...
An indoor visible light communication (VLC) system using white light-emitting diodes (LEDs) usually consists of multiple optical attocells, such that it can achieve full coverage of an indoor environment. The performance of an indoor multi-cell VLC system could be significantly degraded by inter-cell interference (ICI). To address the ICI issue, we propose and investigate an angle diversity multi-element...
In this work, we acknowledge the existence of the accumulation of the loopback self-interference when AF protocol is made used of in FDTW relaying and the channel estimation of the loopback channel is not done perfectly as will seen in the section to follow. The accumulation of the loopback self-interference comes from the functionality of FD antenna, which will bring back the transmitted signal to...
Abstract-In this article, the authors focus on a correlated channel model for secure relay beamforming in the relayeavesdropper network. In this network, a single-antenna sourcedestination pair transmits secure information with the help of a amplify-and-forward (AF) relay equipped with multiple antennas. The relay cannot obtain the instantaneous channel state information (CSI) of the eavesdropper...
The transmission distance of continuous variable QKD (CV QKD) protocol based on Gaussian modulation has been quite limited by the low efficient reconciliation protocol. On the other hand, noiseless linear amplifier (NLA) have greatly enhanced the ability of CV QKD. In this paper, we propose a Gaussian post-selection method simulating NAL in CV QKD, followed by a reconciliation process based on systematic...
The performance of multiuser multiple input multiple output orthogonal frequency division multiplexing (MIMO-OFDM) systems can be significantly improved by using efficient resource allocation schemes. There are a lot of resource allocation schemes to maximize the system capacity. However, under a practical circumstance of employing a suboptimal MIMO detector, optimizing for maximum capacity may not...
In D2D communication, power allocation is important due to interference among D2D users. In this paper, we model the power allocation problem in D2D environment as a stochastic game and find the Nash equilibrium. The simulation shows the workability and correctness of the proposed stochastic power allocation game.
In this paper, we propose two compressed sensing methods, signed CASS and iterative signed CASS. The effect of signs of entries in a sparse signal could lead to lower accuracy rate of CASS in low SNR region. Thus, signed CASS is proposed to take the signed of a sparse signal into account. The performance of signed CASS is better than CASS in low SNR region and comparable in high SNR region in terms...
Most previous researches on the rate analysis of the power allocation (PA) schemes in two-way decode-and- forward (DF) relay systems typically focus on maximizing the instantaneous objective rates. However, the ergodic rate analysis of the optimized rates is not well considered. In this paper, we investigate the ergodic rates of the PA schemes in a two-way DF relay system, where the physical-layer...
This paper introduces algorithms to find relay ordering in a multi-hop cooperative diversity network. We first describe an optimal relay ordering algorithm for this multi-branch multi-hop cooperative diversity network. The optimum algorithm has a very high complexity that makes it hard to implement when being used in an environment with a large number of relays. Thus, we propose algorithms to reduce...
In this paper, we study a new full duplex relaying (FDR) network in which the relay has a buffer and works in decode-and-forward (DF) protocol. We investigate the performance of three models in terms of throughput, i.e., Full duplex relay without buffer-aided (conventional FDR), full duplex relay with unlimited buffer, and full duplex relay with limited buffer, respectively, and derive the closed-form...
Multi-contrast magnetic resonance images are not only compressible but also share the same inter-spatial structure as they are scanned from the same anatomical cross section. In addition, the wavelet coefficients of a MR image naturally yield an intra-quadtree structure and has been used in compressed imaging. In this paper, we propose a new method to reconstruct multi-contrast MR images by exploiting...
We report a new 4-dimensional (4D) 6PolSK-QPSK modulation format which carries 32 constellation points and 5 bits per symbol. It can be used as an alternative to PM-QPSK and PM-8QAM in a flexible-rate coherent modem.
Precision ultra-wideband (UWB) ranging and positioning require accurate estimation of time of arrival (TOA). In this paper, we proposed a computationally efficient algorithm to estimate the TOA for UWB signal. In the algorithm we first obtain the propagator operator by using the Propagator Method (PM), and then we adopt the ESPRIT Method estimating the TOA directly. This algorithm requires no peak...
In this paper, an improved algorithm of coarse synchronization in the downlink of 3GPP LTE system is presented. This new algorithm can reduce the MSE (mean square error) of detected fractional carrier frequency offset (FCFO) by an order of magnitude and improve the accuracy rate of start point estimation by near 80 percent when SNR equals 0 in contrast with conventional coarse synchronization algorithms,...
The paper introduces the basic method of Monte Carlo simulation, establishes the binary communications system's electric circuit model, and obtains the relational curve of the error rate and the signal-to-noise ratio in the binary communications system with the Monte Carlo simulation method. The result indicates that the bit error rate of the system decreases gradually with the increase of the signal-to-noise...
We propose a modified two-stage feedforward carrier recovery algorithm for M-QAM formats that achieves a 3× reduction in computation complexity compared to a single-stage algorithm. When combining with a feedback loop, 5.3-10× computation complexity reduction can be achieved.
We demonstrate that reduced-guard-interval (RGI) CO-OFDM systems are more tolerant to equalization-enhance phase noise (EEPN), which is a non-negligible impairment of single-carrier systems in long-haul transmissions, especially for next generation transport systems.
According to the demand of spread spectrum signal processing in lower SNR conditions, a novel blind estimation algorithm of the pseudo-noise (PN) sequence for the direct sequence spread spectrum (DSSS) signal is proposed based on the similarities among the DSSS signals and the eigenanalysis technique. At first, through segmentation processing and average cross-correlation calculation, the starting...
The multi-resolution multicast service is an emerging service for future generation communication systems, supporting different service qualities for receivers with different capabilities. Under such a scenario, the radio resource arrangement becomes very complex but is important in order to enhance the overall system throughput. For multi-resolution multicast OFDM systems, we proposed an adaptive...
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