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This paper describes an energy-efficient PAM-4 digital receiver based on sequence detection. This scheme takes advantage of the ISI in the channel to reconstruct the time domain 5-bit sequence including MSB and LSB. The architecture also enables built-in error correction with very low latency. This concept is demonstrated with prototype implemented in a 28nm FDSOI CMOS using only 18-data comparators...
RaptorQ is the most advanced raptor code and has an overhead-failure curve close to the random fountain code over the GF(256) finite field. Theoretically, it is possible to encode and decode with linear time complexity by an inactivation decoding algorithm, which is a hybrid algorithm of belief propagation and Gaussian elimination. However, achieving linear time complexity in a real-world implementation...
We consider an inter-layer FEC technique combined with hierarchical 16QAM schemes for stereoscopic video transmission over AWGN relay channels. The proposed system with the suitable hierarchical value (α) can gain about 2.26–6.18 dB in the average PSNR performance, compared with the system using conventional FEC and hierarchical 16QAM schemes.
Polar codes are the first class of forward error correction (FEC) codes with a provably capacity-achieving capability. Using list successive cancellation decoding (LSCD) with a large list size, the error correction performance of polar codes exceeds other well-known FEC codes. However, the hardware complexity of LSCD rapidly increases with the list size, which incurs high usage of the resources on...
This work reports the design and prototyping of a 100 Gbit/s OTN 40 nm test chip, manufactured as a test vehicle strategy for an OTN processor device under development at CPqD for the Brazilian telecom industry. The main issues related to the integration of third-party silicon intellectual property solutions are covered, together with the evaluation environment where the test chip was successfully...
A novel hybrid orthogonal frequency division multiplexing (H-OFDM) technique, for 5G candidate waveforms, has been proposed to improve the performance of conventional OFDM systems in this paper. In H-OFDM system instead of conventional cyclic prefixes (CPs) it is used hybrid CP as a guard interval. The hybrid CP consists of zero tail (ZT), unique word (UW) and CP. Computer simulations have been performed...
In this paper, we studied the irregular row weight problem of DVB-S2 LDPC short frame. This problem will cause the failure of decoding. Based on a special structure of check matrix address table, we have achieved a simple and common solution to the problem.
Laser phase noise degrades the bit-error-ratio (BER) performance after forward-error correction (FEC), so-called post-FEC BER. In order to suppress phase noise, we introduce iterative decoding between a decoder for carrier-phase estimation and an FEC decoder. The simulation results show that the post-FEC BER performance is improved by 0.8 dB by using the iterative decoder.
As the mobile radio communication needs of uniformed and emergency services soared, two way land mobile radio communication systems are evolved from analog to digital. Although digital radios have better communication range, noise performance and provide superior voice quality in most cases compared to analog counterparts, they have hard time to maintain good voice quality in particular conditions...
Laser phase noise remarkably degrades the bit-error-ratio (BER) characteristics of Trellis code modulation (TCM) signals based on high-order QAM constellation. In order to suppress phase noise, we propose to combine adaptive equalization with maximum likelihood estimation for TCM decoding. With our scheme, we experimentally evaluate the BER characteristics of dual-polarization 64QAM-based TCM optical...
The main aspect considered in this paper is a comparison of interleaver sizes for convolutional and low-density parity-check codes (LDPC) employed for 100 Gbps wireless communication at 240 GHz with parallel sequence spread spectrum (PSSS). Interleavers required for PSSS-15 and convolutional codes are larger in silicon area than a complete Reed-Solomon decoder. Thus, convolutional codes are not recommended...
We study a setting where two source streams with different decoding deadlines must be transmitted over a burst erasure channel. The source streams are multiplexed into a single stream of channel-packets at the encoder and transmitted over a packet erasure channel. The decoder must recover the source-packets within each stream sequentially, by their corresponding deadlines. We consider the burst-erasure...
We introduce a new class of forward error correction (FEC) codes for VoIP communications which support different recovery delay depending on the channel conditions. Specifically, our proposed class of Dual-Delay (DD) codes can recover from challenging long bursts of losses with close to theoretical minimum delay so as to meet playback deadlines for recovered packets. They further improve conversational...
Opportunistic routing (OR) is a promising technology to enhance the throughput of wireless networks, which can be implemented in a distributed manner using random linear network coding (RLNC). To reduce the computational cost incurred by RLNC, most previous approaches partition the input packets into disjoint small chunks, apply RLNC within each chunk, and guarantee the decoding reliability by a feedback...
We discuss the threat that hardware Trojans (HTs) impose on wireless networks, along with possible remedies for mitigating the risk. We first present an HT attack on an 802.11a/g transmitter (TX), which exploits Forward Error Correction (FEC) encoding. While FEC seeks to protect the transmitted signal against channel noise, it often offers more protection than needed by the actual channel. This margin...
Polar code, which is capable of achieving channel capacity, is known as a promising forward error correction (FEC) code in coding theory. In this paper, a four-bank memory architecture is proposed for polar decoder to store the initial and the intermediate processing data. Based on the proposed load-balance data allocation scheme, each memory bank is able to be equipped with only two access ports,...
Cross-entropy (CE) based stopping criteria is known for its early termination capability of the turbo decoding iterations without scarifying its performance, in terms of bit error rate (BER). This advantage, however, performs well in high signal-to-noise ratio (SNR) albeit requiring infinite iterations at low SNR, thereby resulting in more unwanted computations and decoding delays. In this paper,...
Low Density Parity Check (LDPC) and Bose-Chaudhuri-Hochquenghem (BCH) are channel coding that have been recently developed associated with QPSK, 8PSK, 16APSK, and 32APSK modulations for the system to work properly on the nonlinear satellite channel. The likelihood of either system bit error or block error probability is one of the most commonly used features in modern communication systems. This paper...
Orthogonal Frequency Division Multiplexing, together with Multiple-Input Multiple-Output, is a pillar technique for new generation mobile networks, i.e., for the mobile networks in direction of 5G. Its crucial properties of robustness against fading and Inter-symbol Interference make it a great choice for the demanding data rates of future mobile networks. This paper presents a technique for additional...
This paper investigates the performance of the BCH encoder and decoder for different error-correcting capabilities. The focus is on BCH codes of length 255. The motivation for this research is a project where data symbols of this length are transmitted over an error-prone wireless channel. The paper presents a mathematical introduction into encoding for cyclic codes and decoding of the BCH code. The...
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