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In this paper, we propose a parallel block-based Viterbi decoder (PBVD) on the graphic processing unit (GPU) platform for the decoding of convolutional codes. The decoding procedure is simplified and parallelized, and the characteristic of the trellis is exploited to reduce the metric computation. Based on the compute unified device architecture (CUDA), two kernels with different parallelism are designed...
In this paper, the performance study of OSMLD convolutional self orthogonal (CSOC) and OSMLD block codes over Gamma-Gamma ΓΓ atmospheric turbulence channel is studied. We analyse the efficiency of channel coding technique for different atmospheric turbulence conditions by modeling the channel with a Gamma-Gamma ΓΓ distribution and with BPSK modulation. The results obtained by Monte Carlo simulation...
In this paper, we study the block error rate (BLER) performance of spatially coupled low-density parity-check (SC-LDPC) codes using a sliding window decoder suited for streaming applications. Previous studies of SC-LDPC have focused on the bit error rate (BER) performance or the frame error rate (FER) performance over the entire length of the code. Here, we consider protograph-based constructions...
Channel coding plays a vital role for the maintenance of quality and reliability in data delivery in a communication system. Practical applications of channel coding includes the area of deep space communication, satellite communication, wireless communication, data transmission etc. Convolution coding is one of large class among them. The main aim of this paper is to elucidate the main features of...
This paper presents a prototype implementation and experimental performance evaluation of compress- and-forward (CF) relaying using software-defined radios. Under QPSK transmissions from all nodes, the relay demodulates the received signal before applying distributed joint source-channel coding (DJSCC) implemented with the help of an off-the- shelf convolutional code. The destination employs two stages...
This paper investigates block error rate (BLER) performance and computational complexity of candidate channel coding schemes for ultra-reliable low latency communication (URLLC) in 5G. The considered candidates are the same as those identified in 3GPP: turbo, LDPC, polar, and convolutional codes. Details of code constructions and decoding algorithms are provided with computational complexity analysis...
This paper presented a multi-rate Star-QAM encoding and decoding method based on the hierarchical coding which could be adjusted to achieve the channel coding efficiency and modulation. The design is based on the combination of soft / hard decision in layered decoding. We have successfully increased BER performance to 0.5dB which achieved 10−5 when SNR is 11 compared to no stratification codec considering...
In this work, we evaluate the performance of Wavelet-Coding into offering robustness for OFDM signals against the combined effects of varying fading and noise bursts. Wavelet-Code enables high diversity gains with a low complex receiver, and, most notably, without compromising the system's spectral efficiency. The results show that the Wavelet-Coded OFDM system achieves a BER of 1E-3 with nearly 6...
We experimentally demonstrate 56-Gbit/s 4-D PAM-4 TCM transmission over 40 km SMF without optical amplifiers. Results show that TCM PAM-4 outperforms the uncoded PAM-4 by more than 2.5 dB at a BER equal to 10−6.
Error-Control Coding (ECC) now plays an important role in wireless transceivers because it helps to increase link reliability and lower required transmit power. One popular problem of ECC implementation is the trade-off between high coding-gain and decoder's complexity. In this paper, we propose a serial concatenated ECC solution which is a combination of truncated-iteration layered-decoding LDPC...
A recent video coding standard, called High Efficiency Video Coding (HEVC), adopts two in-loop filters for coding efficiency improvement where the in-loop filtering is done by a de-blocking filter (DF) followed by sample adaptive offset (SAO) filtering. The DF helps improve both coding efficiency and subjective quality without signaling any bit to decoder sides while SAO filtering corrects the quantization...
Mixed-excitation linear prediction (MELP) is a United States department of defense speech coding standard used mainly in military applications and satellite communications, secure voice, and secure radio devices. MELP vocoder could provide an acceptable voice quality over prone erroneous channels in various environments by exploiting redundancy statistics of voice data. This paper explains performance...
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...
Physical-layer network coding (PNC) can potentially boost the throughput of a two-way relay network by 100% compared with conventional packet forwarding schemes. However, the complexity of PNC channel decoders can be considerably higher than the complexity of channel decoders for point-to-point communication systems. Although many PNC channel decoders proposed to date have good decoding performance,...
We commenced two memory measure, and power productive algorithmic transmutation for the Viterbi Algorithm (VA) and genetic algorithm(GA). The first performs in-place ciphering marking down memory vital and bit transitions on the data address bus, although the second elucidate the traceback standard of expressive VA, Today the technology changes indubitable fast as it evoked from old stone (Palaeolithic)...
Telemetry systems suffer from inter-system interference due to other technologies competing for the shared unlicensed ISM/SRD band. The resultant collisions could have a profound impact on the underlying BLER performance of telemetry systems. A telegram splitting approach has been recently proposed in the literature that suggests splitting transmitted telemetry blocks into multiple telegrams and transmitting...
A competent and fast decoding method for a Rate 3/4 Trellis Coded Modulation (TCM) used in Digital Mobile Radio systems, is proposed in this paper. Digital Mobile Radio (DMR) is a standard for digital radio. European Telecommunication Standard Institute (ETSI) developed the specification for the Professional Mobile Radio (PMR) users. TCM is a bandwidth efficient modulation. In TCM, doubling of constellation...
Nonsystematic convolutional (conv.) codes can provide higher constraint length and free distance, which lead to better performance than the systematic codes. However, for large nonbinary symbols that cannot be practically decoded by Viterbi decoder and need to be decoded with Vector Symbol Decoding (VSD) technique instead, using systematic conv. codes have two main advantages. First, the method of...
An area efficient and high speed architecture design of hard decision Viterbi decoder with encoding rate of 1/2 and constraint length of k = 3 is presented in this paper for the application in satellite communication. The proposed Viterbi decoder is implemented in field programmable gate array (FPGA) and also in application specific integrated circuit (ASIC) using UMC 0.18 µm technology where the...
In this paper, a novel attempt is made to design a reconfigurable coder system which can be reconfigured on-the-fly to work either as an encoder, or decoder, or both encoder and decoder depending on the user requirements. In order to build the proposed reconfigurable system, Convolutional encoder, Viterbi decoder, Golay encoder and Golay decoder are employed in different combinations for the proposed...
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