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The contribution of this paper is implementing a high throughput LDPC codec in FPGA for quantum key distribution (QKD) system. By software, the throughput of error correction in QKD system via LDPC codec could only reach 1.8Mbps, which is not satisfactory for high speed QKD systems. Thus, it is desirable that LDPC error correction is realized in FPGA to increase the throughput. LDPC codec is implemented...
it is known that the more reliable LDPC code is the longer code, and it is also known that LDPC decoders with flooded architecture which allow parallel processing can achieve high throughputs. But, just architectures become very complex and require more hardware resources when the code length is large and random, so achieving a high error correction rate on short code lengths is considered a challenge...
This paper proposes a novel forward-backward four-way merger min-max algorithm and low latency check node unit (CNU) architecture for check node processing of nonbinary low-density parity check (NB-LDPC) codes. This algorithm derives simultaneously two output vectors for forward and backward processing in each step. A parallel switch network and parallel-serial elementary computation unit are proposed...
As the flash memory continues its capacity scaling and correspondingly decreases its reliability, a technology upgrade regarding the error-correction engine in state-of-art solid-state drives (SSDs) is intensely expected. Due to their limit-approaching decoding ability, low-density parity-check (LDPC) codes are seen as one of the most promising substitute for the traditional BCH codes, though implementation...
Polar codes have recently become increasingly popular due to their simple structure and low decoding complexity. However, polar codes are still not suitable for real-time applications because of the long decoding latency. In this paper, by analysis of the conventional architecture of SC decoder, a low latency SC decoder architecture is proposed. Using the proposed architecture, the decoding latency...
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...
The throughput of a conventional rate-compatible code based hybrid automatic repeat request (HARQ) protocol is lower-bounded by the rate of the mother code used. The mother code rate along with the highest puncture rate determine the operation range of the protocol in terms of the average received signal-to-noise ratio (SNR). In this paper, we propose a new HARQ protocol based on rate-compatible punctured...
Recently, non-orthogonal multiple access (NOMA) has gained more attention as a candidate multiple access scheme for future radio access. A major reason for this is that NOMA has the potential to achieve a more favorable tradeoff between system efficiency and user fairness than orthogonal multiple access (OMA), which is adopted in the 4th generation mobile communication systems such as LTE and LTE-Advanced...
Molecular communication is a new framework in data communication based on biological mechanisms and systems. In molecular communication system, the transmitter sends information by transmitting certain chemical molecules called data molecules and after propagation of the molecules in the environment they are collected and decoded by the receiver. Due to randomness in the movement of the molecules,...
Physical layer processing for 5G wireless is expected to operate at a very high-throughput with very low latency. Developing a channel coding system based on Hybrid Automatic Repeat reQuest (HARQ) for evolving requirements necessitates extensive experimentation involving undesirably long development cycles. We demonstrate the use of a High-level Synthesis (HLS) compiler in LabVIEW Communications to...
This paper presents a new dynamic and fully generic implementation of a Successive Cancellation (SC) decoder (multi-precision support and intra-/inter-frame strategy support). This fully generic SC decoder is used to perform comparisons of the different configurations in terms of throughput, latency and energy consumption. A special emphasis is given on the energy consumption on low power embedded...
In this paper we study the problem of increasing the decoding success probability of random linear fountain code over GF (2) for small packet lengths used in delay-intolerant applications such as multimedia streaming. Such code over GF (2) are attractive as they have lower decoding complexity than codes over larger field size, but suffer from high transmission redundancy. In our proposed coding scheme...
The emergence of Internet-of-Thing (IoT) has driven tremendous growth of number of connected devices such that in the near future everything is connected to the networks forming super-dense networks. To cope with this challenge, this paper investigates networks with multiple relays serving massive number of devices (users), termed as multiway multirelay (MWMR) networks. Coded random access is adopted...
This paper presents our research in developing high performance but low complexity MIMO decoders for the newest WLAN, i.e. 802.11ac. K-best and Trellis methods are proposed to develop the MIMO decoders. Their performances are observed and compared to MIMO decoders which are based on linear and optimal methods, i.e. ZF, MMSE, and ML. Run test of 2×2 MEMO, 64-QAM, Coding rate 3/4, and 40MHz of bandwidth...
In order to reduce the outage probability of cooperative communication, a hybrid forwarding HARQ scheme in wireless network is proposed. In this scheme, if the relay decoding unsuccessfully until the last time, the Amplify-and-Forward protocol will be used to retransmit. Otherwise, the code cooperation will be used. Both of the Chase Combining and Incremental Redundancy combining is used in this scheme...
In this paper we study the design of LDPC decoding scheme for very high throughput optical communications for a full self-seeded optical architecture dedicated to cloud radio access network (C-RAN). The objective of this paper is to demonstrate the potentiality of Bit Flipping (BF) algorithms. It is shown that the Gradient Descent Bit Flipping (GDBF) algorithm with a little improvement is suitable...
Next-generation wireless and/or satellite communications require high transmission efficiency and high reliability to provide various services with subscribers. To satisfied these requirements, incorporated MIMO system with FTN techniques based on layered space time coded method are considered in the paper. To improve performance, STTC was employed as an inner code. They can yield significantly increased...
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...
In this paper, we present an LDPC decoder design equipped with an adaptive throughput mechanism achievable using a multiple quantization scheme. Three representations are supported by the proposed architecture: 1-bit (hard decision), 2-bit, and 4-bit messages. A throughput increase by of factor of 4, 2 and 1 can be achieved with respect to the 4-bit message representation version, by simultaneously...
In this paper, we propose a new IP transmission architecture over optical fast frequency hopping code-division multiple-access (OFFH-CDMA) network capable of supporting multirate transmissions for applications in flexible optical access networks. The proposed network architecture is independent of the spreading code employed and does not require any new optical processing technology. The performance...
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