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The continuous demands on increased spectral efficiency, higher throughput, lower latency and lower energy in communication systems imposes large challenges on appropriate channel coding schemes and their efficient hardware implementation. Consequently, channel coding is not only a matter of information theory but also more and more knowledge on efficient parallel hardware architectures and underlying...
In order to support the very high code rates and challenging throughput demands of the LTE/LTE-A standard, sophisticated Turbo-Code decoder architectures are required. Two types of architectures for the commonly used Max-Log-MAP algorithm are suited to fulfil throughput and frame error rate (FER) performance requirements. One is the more common parallel serial MAP architecture (PSMAP) and the other...
This paper presents three new ensembles of low density generator matrix (LDGM) codes, all of which are systematic codes. We prove that, under the maximum likelihood (ML) decoding, these codes can achieve the capacity of binary-input output-symmetric (BIOS) memoryless channels in terms of bit-error rate (BER). The proof technique is different from that for totally random block code ensembles. The recently...
Emerging Memories (EMs) could benefit from ErrorCorrecting Codes (ECCs) able to correct few errors in a fewnanoseconds. The low latency is necessary to meet the DRAM-likeand/or eXecuted-in-Place requirements of Storage Class Memorydevices. In this paper we design an ECC decoder of a shortenedBCH code with 256-data-bit page able to correct three errorsin less than 3 ns. The tight latency constraint...
This paper presents a partial-parallel LDPC decoder based on sum-product algorithm with high throughput. The hardware implementation of decoder considers design issues with respect to FPGA and time scheduling is proposed based on modified TPMP1 algorithm in order to reduce the number of clock cycles, hardware resources and power. The decoder is implemented for a code length of 672 whit rate of 3/4,...
As being a complementary technique for Machine Type Communications (MTC) in future 5th Generation (5G) wireless communications, the control mechanism and control signaling should preferably be able to operate at possibly low Signal-to-Noise Ratio (SNR) without interfering the existing cellular network. In this paper, we propose an enhanced mechanism for the control signaling, targeting to low-power...
Expectations and requirements for wireless communication systems continue to grow rapidly. Reliability is one of the most challenging criterions. Soft combined turbo codes technique aims to improve the error correction capability of turbo codes by using soft combining principle, at bit level, inside the turbo decoder. In particular, this approach is based on weight factors which are key elements that...
This paper introduces a linear permutation module before the inner encoder of the iteratively decoded product coding structure, for the transmission of scalable bit streams over error-prone channels1. This can improve the error correction ability of the inner code when some source bits are known from the preceding outer code decoding stages. The product code consists of a protograph low-density parity-check...
We proposed a nonbinary byte-interleaved coded-modulation scheme with inner and outer turbo-like iterative decoder. The net coding gain is 0.6dB higher than the state-of-the-art binary SPC-LDPC-based turbo-product counterpart, with adjustable iterations and lower error-floor.
We analyze deterministically constructed (i.e., non-ensemble-based) codes in the waterfall and error floor region. The analysis directly applies to several FEC classes proposed for high-speed OTNs such as staircase and braided codes.
In this work, the importance of the channel mismatch effect in degrading the performance of deployed quantum LDPC codes has been pointed out. We help remedy this situation by proposing new quantum LDPC decoding strategies that can significantly reduce performance degradation by as much as 50%. Our new strategies for the quantum LDPC decoder are based on previous insights from classical LDPC decoders...
The discarded non-zero bit in multiple shift operations of CORDIC algorithm using the micro-controllers to decode the resolver angle will reduce the decoding accuracy of resolver. The compensation algorithm was proposed to improve the decoding accuracy in the paper. Results demonstrate that the proposed compensation algorithm can improve the decoding accuracy effectively using CORDIC algorithm in...
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...
Short cycles in the Tanner graph of a given LDPC code has negative effect on the performance of iterative decoding. To improve the performance, we presented an approach for constructing Quasi-Cyclic Low-Density Parity-Check (QC-LDPC) codes whose associated Tanner graph has large girth and a small amount of short cycles. Each column block of the parity check matrix was designed by adding circulant...
Computer-generated hologram (CGH) has attracted much attention over the past decades, and has been widely applied in many areas, such as display, security and optical tweezer. In this paper, CGH-based authentication approach is presented by using optical correlation. After the original image is sparsified, phase-only mask is iteratively extracted as ciphertext based on CGH system. It is illustrated...
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...
In optical communication systems using wavelength division multiplexing, the transmission link can no longer be described as an AWGN channel as the co-propagating signals influence each other due to the nonlinearity of the fiber. As a consequence of the resulting phase noise, frequent cycle slips may occur in the carrier phase estimation which can be counteracted by the use of differential modulation...
Luby transform (LT) codes are defined by degree distribution functions of encoded symbols. In erasure channels, good degree distribution functions should prevent the ripple of degree-one symbols from vanishing until the successful termination of decoding process. In this paper, we show that for binary input additive white Gaussian noise (BIAWGN) channels, performance of LT codes also depends on the...
This study proposes a novel coding method, called geometry permutation decoding (GPD). The GPD algorithm provides a two dimension geometry construction and decodes information sequence based on this construction. Majority logic decoding (MLD) algorithm can be used for some specially coding scheme, especially finite geometry codes. MLD algorithms are simple and fast owing to the finite geometry construction,...
To increase throughput efficiency and improve performance, FTN (Faster Than Nyquist) method and LDPC (Low Density Parity Codes) codes are employed in DVB-S3 system. In this paper, we proposed efficient turbo equalization model to minimize inter symbol interference induced by FTN transmission. To make performance improved in turbo equalization model, the outputs of LDPC and BCJR (Bahl, Cocke, Jelinek...
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