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Interference alignment (IA) is a promising interference management technique to improve the achievable degrees of freedom (DOF) and system throughput in a K-user interference network. However, most IA schemes only focus on minimizing the interference leakage power, leading to poor performance at low to moderate SNRs. In this paper, we put forward a novel algorithm, namely, sum-rate improved interference...
Selection cooperation is an effective solution for cooperative communications and the automatic repeat request (ARQ) protocol can provide additional diversity gain for wireless networks. In this work, considering a large network where direct transmissions only exist in the neighbors of each node, we investigate an improved diffusion selection cooperation protocol integrated with ARQ, and taking into...
CV-QKD has drawn many attentions due to the potential to provide high secret key rate and low cost. Error reconciliation is the key module of post processing of a CV-QKD system. In this paper, an improved LDPC-based SEC error reconciliation scheme is proposed. Through the optimization of inner-level decoding and reduction of the iteration rounds of inter–level decoding, the reconciliation can be accelerated...
In order to reduce the outage probability of cooperative communication, a hybrid forwarding HARQ scheme in wireless network is proposed. In this scheme, if the relay decoding unsuccessfully until the last time, the Amplify-and-Forward protocol will be used to retransmit. Otherwise, the code cooperation will be used. Both of the Chase Combining and Incremental Redundancy combining is used in this scheme...
The three-phase process of achieving secret sharing over a wiretap channel are, respectively, advantage distillation, information reconciliation, and privacy amplification. In this paper, we first generalize the extended orthogonal space time block codes (EO-STBCs). Then, based on the generalized EO-STBCs (GEO-STBCs) and the feedback bits from the legitimate receiver, we propose a new advantage distillation...
A wireless network architecture is studied in which edge nodes (ENs), such as base stations, are connected to a cloud processor by dedicated fronthaul links, while also being endowed with caches, in which popular content, such as multimedia files, can be proactively stored. Cloud processing enables the centralized implementation of cooperative transmission by the ENs, albeit at the cost of an increased...
In this work, we derive analytical approximate expressions for the user rates achievable by interference alignment (IA) algorithms in single-beam multiple-input multiple-output (MIMO) networks for a fixed channel realization. Unlike previous works that perform a large-system analysis in which the number of users, antennas, or streams is required to tend to infinity, in this paper we only require that...
Interference Alignment (IA) is technique that, in a large sense, makes use of the increasing signal dimensions available in the system through MIMO and OFDM technologies in order to globally reduce the interference suffered by users in a network. In this paper, we address the problem of downlink cellular networks, the so-called interfering broadcast channels, where mobile users at cell edges may suffer...
In this paper, we consider a new architecture for mobile systems to effectively accommodate mobile cloud computing traffics in conjunction with conventional delay-limited traffics (e.g., voice traffics). It is assumed that small base stations (BSs) do not decode cloud data streams from a user, but forward the received signals from the users to a cloud server (CS), while small BSs are to decode conventional...
In this paper a cognitive radio network is considered where a licensed primary user and an energy harvesting secondary (cognitive) user co-exist, and relaying protocols are proposed where the cognitive user acts as a relay for the primary signal in return for spectrum access. We analyze two relaying paradigms, namely, time-splitting cooperative spectrum sharing (TS-CSS) relaying and power sharing...
We investigate the effect of radar interference on an uncoded data communication system where the optimal Maximum-A-Posteriori decoder is used and the bandwidth of the radar system is assumed to be much larger than the one of the communication system. Conclusions depend on how the radar interference power, measured by the Interference-to-Noise ratio (INR), compares with the intended signal power,...
This paper analyzes the spectral efficiency, probability of a lost block and average delay performances of the generic Repetition Redundancy (RR) and Incremental Redundancy (IR) truncated Hybrid-Automat Repeat reQuest (H-ARQ) algorithms on block-faded Rayleigh channels. The analysis presents the derivation of the three performance metrics' expressions, using an intermediate performance metric called...
In this work, we propose a weighted bit-flipping (WBF) decoding for product LDPC codes of which decoding complexity is lower than the belief-propagation (BP) decoding. Two distinct types based on page computations and row/column computations are proposed. In addition, we address an issue of hard decision algorithm for product LDPC codes suffering a performance degradation at high iteration numbers...
One of the main impairments for advanced digital subscriber line (DSL) systems is crosstalk. Crosstalk can be effectively cancelled using vectoring. However, some challenges such as implementation and computational complexities associated with full users' coordination when the number of DSL lines is large or when they are not co-located at any end make full vectoring impractical in many scenarios...
This article studies the performance of decision-based cooperative spectrum sensing using random medium access. Unlike scheduled medium access, random medium access entails a non negligible probability of collision which affects the detection accuracy. Novel closed form expressions are derived for the detection probability, the false alarm probability, and the average reporting time, assuming the...
Forward Error Correction codes are required to remove errors such as noise, crosstalk etc that transpire in communication channel. In this paper, we propose a concatenated (Single Parity Check, BCH and Low Density Parity Check) coding method to remove the errors and improve the efficiency of the system. Simulation results shows that Single Parity Check method along with BCH and Low Density Parity...
A low-density parity check (LDPC) circuit and its properties as a post-processor is proposed for physically unclonable functions (PUFs) applications. PUFs can be realized using process variations or signal noises in SRAM or other PUF circuits, whereas the generated data needs to be processed by error check and correction (ECC) because of their inherent intra-PUF variabilities. The bit-flip LDPC circuits...
In this paper, we propose an adaptive cluster-centric small cell network with cooperative caching and transmission design, in which small base stations (SBSs) are grouped into disjoint clusters and in-cluster cache space is utilized as an entity. We design a combined caching scheme where part of the available cache space is reserved for caching the most popular content in every SBS, while the remaining...
We describe a new approach to improve the success rate of symbol decoding with very high-order modulations at receivers equipped with low-resolution analog-to-digital converters (ADC). The proposed method is based on generating self-inflicting pseudo-random white noise signal at the receiving antenna array in order to improve the performance of spatial oversampling. As the optimal amount of this artificially...
This paper presents a link quality model for a wireless communication system with distributed turbo coding and lossy forwarding. The model maps the signal-to-interference-plus-noise ratio (SINR) of packet copies received from different links to a mutual information parameter and, in a second stage, converts it to a block error rate. We present the design and foundation of the model and validate its...
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