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The design of multi-Gbps LDPC decoder has become a hot topic in recent years as the demand of transformation towards 5G. An energy efficient 18Gbps LDPC decoder based on LDPC ASIP with half layer paralleled architecture is proposed. The feasibility of the design is proven by its demonstrator silicon in 28nm CMOS technology, with a record energy efficiency of 18.4 pJ/decoded bit and area efficiency...
In this paper, we propose to optimize the distribution of the average relay energy in a Cooperative Automatic Repeat reQuest (C-ARQ) scheme. We consider wireless transmissions over Rayleigh fading channels between two sources nodes, one relay node and one destination node. We propose to use specific relay and destination treatment for different possible cases. When only one received packet is detected...
This paper presents Powerline Physical-layer Network Coding (Powerline-PNC), a powerline communication architecture that employs physical-layer network coding (PNC). As the first work that applies PNC in powerline communication, we show that Powerline-PNC improves the throughput of bidirectional information interchange in the powerline network by 100% at the SNR cost of 3dB. Specifically, we design...
In this paper, we aim to identify best practices for optimizing random network coding implementations with respect to throughput. Experimental results show that via optimization the throughput of random network coding can be enhanced over 30x compared to a naïve implementation.
Network coding has the potential to improve the performance of current and future communication systems (including transportation and storage) and is currently even considered for communication architectures between the individual processors on same board or different boards in close proximity. Despite the fact that single core implementations show already comparable coding speeds with standard coding...
In this paper, a rate allocation policy is proposed for truncated transmission of spinal codes based on imperfect feedback over block fading channels. By constructing and solving the throughput optimization problem, the optimized rate allocation policy is obtained under the constraint of limited transmission attempts and frame error probability. Both analysis and simulations show that the rate-allocated...
One of the most calculation intensive operations for a 100 Gbps wireless packet processing is a forward error correction (FEC). We are using standard field programmable gate arrays (FPGAs) to prepare a data link layer demonstrator. Therefore, we need to find a high-parallelized FEC structure for our device. The difficulty is to design the 100 Gbps FEC engine that can be realized in an FPGA. In one...
This paper presents a new coding scheme that considerably increases the efficiency of the channel in multicast setting. Specifically, we study the scenario where three terminals exchange their messages via a satellite gateway. The main difference between the proposed scheme and conventional three-way relay channel is the use of joint channel and network coding. This allows three terminals to transmit...
A broadcast transmission scheme for multimedia broadcast multicast services (MBMS) is proposed using a coded system with users' feedback in wireless systems. In the proposed transmission scheme, it is possible to adjust the transmission rate with binary users' feedback signals to maximize the overall throughput for a given set of users as a user-ware broadcast transmission scheme. The proposed scheme...
Cognitive Radio has a potential to improve spectrum efficiency for future wireless communication systems. However, the performance of such systems can be degraded by various factors e.g. imperfect sensing, non-accurate result reporting of the sensed spectrum either due to error-prone reporting channel (RC) or malicious user attack. Moreover the phenomena of reporting only from those cognitive users...
Biomedical Signal and Image Processing presents a variety of challenges in terms of the dimensionality of the data being processed, nature of the processing involved, the expected data throughput and the peculiar requirements for embedded applications. The processing involved often entails the detection of patterns of interest such as lesions in tissue and abnormal transients or rhythms in ECG or...
The increasing data rates expected to be of the order of Gb/s for future wireless systems directly impact the throughput requirements of the modulation and coding systems of the physical layer. In an effort to design a suitable channel coding solution for 5G wireless systems, in this brief we present two approaches to improve the throughput of a Quasi-Cyclic Low-Density Parity-Check (QC-LDPC) decoder...
The implementation of the SubBytes (or S-Box) step of the AES algorithm significantly contributes to the area, delay, and power of AES accelerators. Unlike typical logic gate S-Box implementations, we use full-custom 256×8-bit ROMs, which significantly improve performance and efficiency. We implemented a fully-unrolled, pipelined AES-128 encryption accelerator using ROM-based S-Boxes in 65nm bulk...
Thanks to the property of provably capacity-achieving, the recently-discovered polar codes have been taken many attentions. However, the required long code length makes the decoding latency of the successive cancellation (SC) decoder high. This paper presents a new pre-computation look-ahead technique to reduce the decoding latency of SC. Its basic idea is to simultaneously estimate 2ko transmitted...
This paper proposes a Partial Hybrid Automatic Repeat reQuest (P-HARQ) scheme where the relaying nodes select either forwarding the erroneous packets or requesting retransmission. In contrast to the conventional technique where the erroneous packets is always discarded, the packets found to have errors after decoding are interleaved, re-encoded, and forwarded if relay selects the forwarding mode....
We propose without loss of generality strategies to achieve a high-throughput FPGA-based architecture for a binary Quasi-Cyclic Low-Density Parity-Check (QC-LDPC) code based on a circulant-1 identity matrix construction. We present a novel representation of the parity-check matrix (PCM) providing a multi-fold throughput gain. Splitting of the node processing algorithm enables us to achieve pipelining...
For the next-generation mobile communication system, enlarging the system capacity by allowing the use of non-orthogonal user multiplexing has been suggested. In a downlink multicarrier non-orthogonal multiple access (NOMA) system, single or multiple users are allocated to each subband. In NOMA scheduling, a proportional fair (PF) algorithm, where users with few allocated resources are selected on...
This paper proposes a new method for data reception over a random access channel in a satellite communication system. The method is called Multi-replicA decoding using corRelation baSed locALisAtion (MARSALA). It uses the same transmission scheme as in Contention Resolution Diversity Slotted Aloha (CRDSA) where each user sends several replicas of the same packet over the frame. MARSALA is a new decoding...
Dynamic dataflow models of computation (MoCs) have been introduced to provide designers with enough expressive power to capture increasing levels of dynamism in modern streaming applications. Among dynamic dataflow MoCs, parametrized dataflow MoCs hold an important place as they integrate dynamic parameters and run-time adaptation of parameters in a structured way. In this work, we analyze the temporal...
The major challenge for the development of Turbo-Code decoders for the 3GPP LTE/LTE-A standard is the support of very high code rates while achieving a high throughput with a low decoding latency. For high code rates the decoding process can oscillate, i.e. although the decoder converges to a valid code word in the nth half-iteration, the code word after the n+1th half iteration can be invalid again...
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