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Random Linear Network Coding (RLNC) is a technique that provides several benefits. For instance, when applied over wireless mesh networks, it can be exploited to ease routing solutions as well as to increase the robustness against packet losses. Nevertheless, the complexity of the decoding process and the required overhead might jeopardize its performance. There is a trade-off when deciding the field...
In-band full duplex (IBFD) can theoretically double the throughput of communication systems, and its feasibility has been demonstrated in wireless radio design. It is a promising alternative for the severely bandwidth-limited underwater communication system since it exploits both the temporal and spectral efficiency to the most. Self-interference cancelation is the primary challenge in IBFD's implementation...
Error correcting codes are used for detection and correction of errors in digital communication system. Reed Solomon (RS) codes are part of channel coding and are based on appending of redundancy to the information message to withstand the effect of noise, interference and fading. With the development of smaller process technology, systems are becoming more sensitive to radiation. If not considered,...
A 16-bit (5+11) segmented digital-to-analog converter (DAC), based on a voltage mode R-2R topology that is able to derive high resolution and high performance, in terms of INL and DNL, and less area and power consumption comparing with conventional DACs. It is designed and simulated in 65nm CMOS process. A current compensating technique is used to achieve good dynamic performance. The 16 bit R-2R...
The memories are more and more used as an embedded element rather as a separate block. Being used as a macro, its user has nothing to change or optimize. So, the design of memory needs to address all the issues specially to optimize the rigorous area and power requirements. This paper discusses the issues in design of SRAM memory cell for low power applications. 6T architecture SRAM cell is taken...
This paper is concerned with polar codes for FEC. One major advantage of polar codes is that it is easy to construct polar codes for a specified BMS channel. The standard polar code constructions are designed to minimize the FER of an SC decoder. However, there are polar decoders more powerful than SC, and for some applications BER is more important than FER. We ask, can the code construction be tweaked...
Physical-layer network coding (PNC) can significantly improve the throughput of wireless communication systems by exploiting signal superimposition at relays. It is practically challenging to achieve symbol alignment in PNC. In this paper, we study the impact of the signal power loss and the inter-symbol-interference (ISI) on the system performance when the symbols are not aligned. We show that when...
In this paper, a simple but efficient permutation enhanced parallel reconstruction architecture for compressive sampling (CS) is proposed. In this architecture, a measurement matrix is constructed from a block-diagonal sensing matrix, the sparsifying basis of the target signal, and a pre-defined permutation matrix. In this way, the projection of the signal onto the sparsifying basis can be divided...
Background: In this paper, the phase modulation coding/decoding technology is discussed for the application in the high attenuation medium based on the simulation and the experiment. Methods: For the decoding perspective, the matched filter and the inverse filter are compared. An extra processing is introduced right after the matched filtering to restrain the range sidelobes. Furthermore, in the latter...
In this paper, the performance of state of the art decoding methods of polar codes, such as the SC (Successive Cancellation), BP (belief propagation), LP (Linear Programming), LSC(List Successive Cancellation) and ML(Maximum Likelihood) decoding, over different binary-input discrete memoryless channels (B-DMCs) are presented. Simulation results indicate that decoding algorithms of polar codes have...
Visible light communication (VLC) technology is a new high-speed wireless access technology, finding a appropriate channel coding scheme is one of its main research directions. This paper proposed a new scheme to construct quasi-cyclic low-density parity-check (QC-LDPC) code. It is proved by the simulation result that the QC-LDPC code can help to improve the BER performance of the system because there...
Low-power digital interfaces are a crucial component of reconfigurable systems. We have designed a SPI-compatible, four-wire interface and state machine for use in dynamically scaled voltage systems. The interface features an activity enable signal and latch enable signal on every eighth-bit in order to minimize the total switching power consumed by the interface. The interface also allows for addressing...
The bidirectional fractionally-spaced decision feedback equalizer (DFE) based on the soft outputs combination is proposed. Without any channel estimation, the fractionally-spaced DFE effectively compensates for any phase distortion and suppresses the error propagation. Compared to conventional methods, the soft outputs combining scheme involving the log likelihood ratios (LLRs) of two DFEs outputs...
This paper presents a new degree distribution based on power law so that LT code can perform well. Here, we have simulated our proposed degree distribution and have compared this distribution with robust soliton, binomial, pareto and parabolic distributions. Simulation result shows that this proposed degree distribution outperforms compared to other distribution techniques in terms of message length...
This paper considers the multiple-access relay channel in a setting where two source nodes transmit packets to a destination node, both directly and via a relay node, over packet erasure channels. Intra-session network coding is used at the source nodes and inter-session network coding is employed at the relay node to combine the recovered source packets of both source nodes. In this work, we investigate...
This paper uses an extension of Reciprocal Channel Approximation (RCA) to accurately and efficiently predict the frame error rate (FER) performance of polar codes by analyzing the probability density function (p.d.f) of log likelihood ratios (LLR) associated with information bits. A feedback scheme uses the RCA to predict the p.d.f of LLRs in conjunction with a repetition coding system to decrease...
In this paper, we address the issue of unequal missing protection (UMP) for the design of grouping of radio-frequency identification (RFID) tags. While relying on group generation matrices, grouping of RFID tags allows verifying the integrity of a collection of RFID tags without the requirement for accessing external systems, and can be extended to identify missing RFID tags. Motivated by application...
The amount of generated screen content sequences has recently increased due to the high popularity of multimedia services such as videoconferencing and cloud video gaming. Screen content sequences are characterized by a high number of sharp edges and repeating patterns, which are difficult to compress using current video coding tools. This paper proposes improvements to lossless compression of these...
Polar codes have emerged as the most favorable channel codes for their unique capacity-achieving property. To date, numerous approaches for efficient decoding of polar codes have been reported. However, these prior efforts focused on design of polar decoders via deterministic computation, while the behavior of stochastic polar decoder, which can have potential advantages such as low complexity and...
Belief propagation (BP) algorithm has been widely used for decoding LT codes. It is well known that the premature termination of the BP decoding due to the lack of degree one symbols in the ripple impairs the decoding performance of the code. This problem has been well studied and tackled for binary erasure channel (BEC). However, for binary input additive white Gaussian noise (BIAWGN) channels, the...
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