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The work presented in this paper aims to establish whether a combination of the Logarithm of Likelihood Ratio (LLR), Turbo Codes and Modulation Schemes enhances high and efficient performance in communication systems by minimizing transmission error rates for any given bit combination. Performance Analysis and Interpolation of Turbo codes over Additive White Gaussian Noise and Rayleigh Fading Channels...
In this paper, we consider a MIMO multiuser system in a multipath fading channel. We design a blind receiver for a differential space-time coded modulation. A linear estimator projects the received signal onto the same subspace of the MMSE filter. The system works because of the differential encoding of the information matrices. Numerical results show that the blind receiver has the same performance...
The wireless extension of the JPEG 2000 standard formally known as JPWL is the newest international standard for still image compression. Different from all previous standards, this new standard was created specifically for wireless imaging applications. This paper examines the error resilience performance of the JPEG, JPEG 2000 and JPWL standards in combating multi-path and fading impairments in...
In this paper, the combined normalized and offset min-sum algorithm is proposed for efficient decoding of low-density parity-check (LDPC) codes in optical and magnetic storage systems. The proposed algorithm can be considered as a general case of the normalized and offset algorithms, and offers better BER performance compared to them. The performance improvement is presented for a partial response...
In this paper, we address the implementation of FPGAs of Multi-Input-Multi-Output (MIMO) Decoder embedded in a prototype of 3G / 4G Mobile receiver This MIMO decoder is part of a multi-carrier code division multiple-access (MC-CDMA) radio system, equipped with multiple antennas at both ends of the link that is able to handle up to 32 users and provides raw transmission bit-rates up to 125 Mbps. The...
The goal of this paper is to reduce the power and area of the Static Random Access Memory (SRAM) array while maintaining the competitive performance. Here the various configuration of SRAM array is designed using both the six-transistor (6T) SRAM cell and a new loadless four-transistor (4T) SRAM cell in deep submicron (130nm, 90nm and 65nm) CMOS technologies. Then it is simulated using HSPICE to check...
In asynchronous wireless relay networks, the spacetime codes (STC) applied should be delay-tolerant. Although several delay-tolerant STC have been presented, they are limited by high decoding complexity, low rate and/or low diversity gain. To overcome these limitations, a new class of delay-tolerant STC, called shift group-decodable space-time block codes (STBC), with code rate 1 for arbitrary transmit...
The channel mode of OCDMA system is interpreted first. Then a novel decoding of convolutional codes is proposed according to the characteristics of OCDMA system. And the feasibility of this decoding algorithm is proved with several illustrations. Performance of this convolutional decoding is studied compared with the traditional decoding, Viterbi algorithm. At last, it is concluded that this new decoding...
A Bit-Error-Rate (BER) performance evaluation is presented for mu-Law companded QPSK modulated Mobile WiMax (IEEE802.16e) employing tail-biting convolutional coding (TBCC). The Down Link (DL) Partially Used Subcarrier (PUSC) deployment has been considered for this investigation. Equalized symbol power transmissions for uncompanded and mu-Law companded WiMax scenarios employing mu = 0.1, 1, 3, 10,...
Design of Network on chip architectures for multimedia applications is being widely studied. This involves design decisions at various levels of hierarchy. Topology design is one of the significant factors that affect the net delay and the energy consumption of the system. Most of the applications are characterized by bandwidth requirements and latency constraints. The topology must be built satisfying...
In this paper, a new image compression scheme by introducing visual patterns to interpolative vector quantization (IVQ) is proposed. The goal is to introduce visual patterns on designing the codebook, where only removed details that contain visual patterns and their original counterparts as pairs are trained. In the proposed scheme first input images are down-sampled by ideal filter. Then, the down...
In this paper voltage mode quaternary circuits are introduced. The quaternary circuits are encoder and decoder circuit, half and full adder circuit. Quaternary operators and elements which are used in the implementation of encoder and decoder circuits, half and full adder are also presented. The set of operators are logical sum, logical product, level up, level down, level conversion operator. Quaternary...
Single Row Facility Layout Problem (SRFLP) consists of arranging a number of rectangular facilities with varying length on one side of a straight line to minimize the weighted sum of the distance between all facility pairs. In this paper we use a Particle Swarm Optimization (PSO) algorithm to solve the SRFLP. We first employ a new coding and decoding technique to efficiently map discrete feasible...
We consider the problem of compression of multiple correlated sources. It is assumed that the sources are given as a sequence with neighbouring sources correlated in terms of Hamming distance. In previous work we derived a general distributed source coding (DSC) framework that uses the parity check matrix of a suitably chosen block code C1. In this paper we focus on the special case that C1 is a cyclic...
We consider the problem of joint decoding of signals transmitted from two correlated sources at a destination. In order to achieve high spectral efficiency at a high range of the channel signal-to-noise power (SNR), a high transmission rate is required. In this paper, we design a class of codes for joint-decoding by exploiting bit interleaved coded modulation with iterative decoding (BICM-ID) technique...
The projective geometry (PG) based low density parity check (LDPC) codes are gaining popularity due to their ease of encoding and decoding by the simple majority logic technique. These codes have a flurry of other useful properties, making them ideal candidates/codes for error correction for future wireless applications. This paper brings out a detailed study on the performance of PG codes for different...
Turbo convolutional codes (TCC) are excellent error correcting codes as they show near Shannon capacity performance in communication systems. However, turbo decoders are computationally complex. Recently, a class of modified turbo codes called low complexity hybrid turbo codes (LCHTC) is proposed with bit error rate (BER) which is almost same as that of turbo codes. In this paper improved low complexity...
Interpretation and basic block translation (BBT) are two typical strategies for cold code emulation in a dynamic binary translation (DBT) system. More and more DBT systems employ BBT as the generated native code runs more efficient than the interpretation routines. We observe that BBT's high efficiency is based on those special hardware assists. With certain simple hardware techniques, interpretation...
This paper concerns the issue of side information generation for distributed video coding (DVC). A new side information construction algorithm based on block interpolation is proposed. In this method, we firstly perform block classification to obtain the parameters of the motion estimation, avoiding the full search. Then forward and backward motion estimation is executed to find an initial motion...
In this paper, a novel non-blind audio watermarking scheme is proposed. The method makes use of both channels of stereo music signals. The signals are divided into segments and watermarks are embedded by hiding echoes into these segments. The embedded echoes represent the watermark bits. For single channel watermarking, echoes with two different delays are used. One is used to encode watermark bit...
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