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In this paper, the principle of normalized minimum-sum (NMS) polar decoding process is explored. It is demonstrated that with one properly chosen parameters for NMS algorithm, performances approach to that of the sum-product (SP) algorithm can be achieved. As well, the complexity reduction is realized by calculating a linear function instead of nonlinear function. Simulation results for successive...
The 10Gbase-KR protocol is widely used to accomplish the high speed data conversion in the Ethernet area. This paper presents a design of the critical controller in the physical coding sublayer based on the 10Gbase-KR. In order to satisfy the demand of the high speed data conversion, the scrambler and descrambler are specially designed to work in a parallel mode. The post-synthesis simulation results...
The black box records all the important information that takes place on a flying plane. The black box is a tool used on airplanes to store all activities during flight. The black box has a Flight Data Recorder (FDR) and a Cockpit Voice Recorder. FDR and CVR function to record and record the existing in the aircraft. The black box has recordings of information that occurs during the flight. Data generated...
This paper presents channel model and error correction coding for correlated insertion/deletion errors in high-density magnetic recording media. Simulation results show that the bit error rate can be lowered by the presented coding.
In order to solve the problem of frequency-hopping signal detection, an improved algorithm based on power spectrum elimination and pulse detection is proposed. Firstly, judge the signal type and estimate the width of signal with the hopping frequency by STFT and pulse detection. Then, eliminate the frequency-fixed signal interfere by suppressing the signal. Finally, judge the threshold to realize...
In this work, we study data shaping codes for flash memory. We first review a recently proposed direct shaping code for SLC (one bit per cell) flash memory that reduces wear by minimizing the average fraction of programmed cells. Then we describe an adaptation of this algorithm that provides data shaping for MLC (two bits per cell) flash memory. It makes use of a page- dependent cost model and is...
Transform domain communication system (TDCS) has been proposed to support multiuser communications through spectrum bin nulling and frequency domain spreading for overlay cognitive radio networks. In TDCS systems, specific pseudorandom spreading sequences are assigned to different users for the purpose of multiple access. However, due to the non-zero cross-correlations between any pair of TDCS signals,...
Coded Aperture Imaging (CAI) plays a high performance in remote radiation measurement, an imaging method using high-energy radiation with a spectrum raging from × ray to γ ray has found many applications, including high-energy astronomy and environment monitoring. The kernel of CAI is the coded mask (encoding array) with the relevant decoding array which are usually designed jointly to reconstruct...
The detection of molecular markers such as micro ribonucleic acid (miRNA) expression levels in the cells are essential for diagnosis of a disease, especially cancer. Recently, a huge amount of molecular markers on cell is being extracted by single molecular detection method, as results, excessively detection process and time is required. Meanwhile DNA computing has capabilities to interact with biological...
In this paper, bit interleaved coded modulation with the mapping of different delayed codewords onto the same signals is investigated. This scheme is referred to as delayed bit interleaved coded modulation (DBICM) and the principles of its coding and decoding are presented. Simulation results show that a coding gain of 0.7 dB and 0.5 dB can been achieved by DBICM with soft information over conventional...
In this paper, we propose a low complexity algorithm for decoding where network coding is deployed in client-server networks. We consider battery powered clients, so that minimizing their power consumptions is essential. Our focus is thus on developing a decoding algorithm that can reduce the computational complexity. Unlike general decoding algorithms that are based on Gaussian elimination, we propose...
Decoding of Raptor codes consists of decoding of both the LT part and the precode part of the codes. When LT decoding is performed, a scenario may arise where the message passing-based decoding process is unable to provide non-zero log-likelihood ratio (LLR) updates to a fraction of input symbols even if it is mathematically possible to do so. The problem is even more critical for codes with short...
Vehicular Ad-Hoc Network (VANET) is the fundamental part of future Intelligent Transportation System (ITS). Physical layer is applied to provide messages transmission between vehicle nodes in VANET, so it has great influence on efficiency of ITS. On the basis of analyzing IEEE 802.11p protocol, we presented a design scheme for physical layer communication system of On Board Unit (OBU) in VANET. Furthermore,...
In this paper we study blind recovery methods for identifying the parameters of a convolutional code from an intercepted bitstream. It is assumed that the interceptor has no prior knowledge about the encoder and the recorded bitstream is noisy. The goal is to obtain the following parameters of convolutional code (i) number of inputs (ii) number of outputs (iii) constraint length of the convolutional...
The dedicated short-range communication (DSRC) plays important role in modern intelligent transportation system. The DSRC standards generally adopt FM0 and Manchester encoding technique to reach dc balance and enhance the signal reliability. Same properties are possessed by Miller and inverted Manchester encoding. Therefore, this two techniques can be added in existing FM0/Manchester encoding module...
When complex system designs with complex specifications, where more than one address and data need to process simultaneously, than various protocols are used to process. There are various serial and parallel protocols are significant to used. But, now a day, AMBA AXI protocols are generally used for the interface. In this research work we present a flexible module with generic interfaces. Our implementation...
Motion Estimation is most important part of almost all video coding standards such as H.262/MPEG-2, H.264/MPEG-4 and High Efficiency Video Coding (H.265/HEVC). The HEVC is latest video compression standard and has incorporated many improvements like bitrate reduction, increased coding efficiency and compression efficiency but at the cost of increased complexity. The complexity of H.265 is increased...
Approximate or inexact computing has recently attracted considerable attention due to its potential advantages with respect to high performance and low power consumption. This paper presents the design of an approximate multiplier; this approximate multiplier consists of an approximate Booth encoder, an approximate 4-2 compressor and an approximate tree structure. The approximate design is implemented...
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 this paper, we consider an overlay cognitive radio network that transmits discrete-time analog sources over additive white Gaussian noise channels. Our focus is on the case where the primary and secondary sources are correlated. The secondary user (SU) knows the primary message non-causally, and allocates part of its power for transmitting the primary message. We study a hybrid digital-analog coding...
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