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Raptor codes are the most advanced fountain codes that can provide dynamically changeable code rate and have linear time encoding and decoding. In multimedia communications and different other areas, it is desired that channel codes can provide the property of unequal error protection (UEP). In this paper, we study two methods to provide UEP Raptor codes on the binary erasure channel (BEC): (1) Using...
Turbo code has been one of the important subjects in coding theory since 1993. This code has low Bit Error Rate (BER) but decoding complexity and delay are big challenges. On the other hand, considering the complexity and delay of separate blocks for coding and encryption, if these processes are combined, the security and reliability of communication system are guaranteed. In this paper a secure decoding...
A fiber-optic communication system employing a multistage bit-wise coded modulation scheme is considered as it enables the efficient utilization of higher-order modulation formats in combination with binary forward error correction (FEC) coding. Since modern FEC schemes employ soft-decision decoding, soft information on coded bits is required. In this paper, the decoding metric for the multistage...
Narrowband cyclostationary interference severely limits the performance of power line communications (PLC) on low-voltage in the [3–500] kHz frequency band. For the IEEE 1901.2 narrowband PLC standard system parameters, this interference is not sparse in the time or the frequency domains making recently-proposed sparse interference mitigation techniques ineffective. In this paper, we investigate other...
3D heterogeneous integration (commonly termed as 3DIC) of CPU, GPU and DRAM dies vertically interconnected by a massive number of TSVs (Through-Silicon Vias) is expected to overcome limited bandwidth, high latency and energy consumption of off-chip DRAM. However, spatial and temporal variability in temperature (i.e., hotspots) is anticipated to result in bit error variation in DRAM die. A novel multi-stage...
DVB-T2 (digital video broadcasting - second generation terrestrial) is considered as the most advanced digital terrestrial television system. It supports either or any combination of SD (standard definition), HD (high definition) UHD (ultra-high definition), and mobile TV. One of the challenges of the DVB-T2 is the many options it provides in system mode and parameters which needs to be accurately...
In this paper, a novel iterative equalizer is introduced, the two symbols ISDIC (2S ISDIC) equalizer. The 2S ISDIC is the first equalizer that bridges the gap between the low complexity ISDIC equalizer which has poor performance, to the high complexity inverse channel equalizing methods, such as the LMMSE and the MMSE ISDIC equalizers, which have better performances. The 2S ISDIC will be incorporated...
This paper presents a low-power LDPC decoder design by exploiting inherent memory error statistics due to voltage scaling. By analyzing the error sensitivity to the decoding performance at different memory bits and memory locations in the LDPC decoder, the scaled supply voltage is applied to memory bits with high algorithmic error-tolerance capability to reduce the memory power consumption while mitigating...
This paper analyzes the BER performance of Turbo code which is adapted for DVB-RCS2 standard with various modulation schemes. Firstly this paper introduces the turbo codes and demapping algorithm and analyzes the effect of noise valiance on the turbo decoder and simulates the effect of the performance of the turbo decoder according to the noise variance by adding a pseudo noise. From the result of...
The performance of coded MIMO systems can be enhanced by effectively utilizing soft iterative estimation techniques at the receiver. The main concern on this iterative techniques is computational complexity and feasibility of the hardware implementation. This paper evaluates a number of soft iterative MIMO detection schemes in terms of the bit error rate performance as well as computational complexity...
Due to its advantage of performance over other algorithms, successive cancellation list (SCL) decoding has become one of the most favorable algorithms for polar codes. However, it still suffers a lot from the linear increasing complexity with list size l. In this paper, an adaptive SCL polar decoder based relaxed sorting (RS) approach is proposed, which successfully reduces the sorting complexity...
This research is our first step on the purpose of developing low-complex Viterbi decoder for IoT applications. We evaluate how the values of Viterbi decoder's parameters such as trace back length (L), input data bit-width (D), and LLR truncated value (E), affects to BER and PER of a communication system. The IEEE 802.11ah simulator is used with AWGN channel and BPSK modulation. Our simulation results...
In order to achieve error correction nearer to Shanon's limit, Turbo decoder imparts either Soft Output Viterbi Algorithm (SOVA) or Maximum Posteriori Probability (MAP). The feasibility of most expected path through the Trellis is mainly determined by Max-Log-MAP, a Soft Input Soft Output (SISO) algorithm and gives a better performance over MAX-LOG-MAP (MLMAP) algorithm. To improve the decoder's performance...
Error-control coding pattern is used in modern communication system to uplift the immunity of noisy communication channel by adding the redundant bits. Suitable tuning of internal parameters of constituent codes leads to considerable enhancement in system performance of Turbo code under AWGN channel condition. In this paper, an optimized Serially Concatenated Convolution Turbo Code (SCCTC) has been...
Storage-Class Memory (SCM), NAND flash hybrid Solid-State Drive (SSD) shows advantages of high performance and low power consumption compared with NAND flash only SSD. In this paper, first, three types of SCMs are analyzed respectively, with 0.1 μs, 1 μs and 10 μs read/write times. Then, their SCM/NAND flash capacity ratios are calculated to achieve the required SSD performance for the application...
We demonstrate detection of a superchannel with net bit rate in excess of 1 Tb/s with a single coherent receiver. Novel, pilot-aided equalization and carrier recovery algorithms enable detection of an 11 × 10 GBd DP-64QAM Nyquist superchannel (1.32 Tb/s gross bit rate).
This paper focuses on two-way relaying (TWR) system, where two source nodes exchange information with each other simultaneously via the relay node. We proposes a denoise-and-forward two-way relaying (DNF-TWR) scheme using non-coherent multiple differential phase-shift keying (M-DPSK) modulation when the channel state information (CSI) is unknown. Firstly, we design the denoising mapping function at...
In this paper, the performance of state of the art decoding methods of polar codes, such as the SC (Successive Cancellation), BP (belief propagation), LP (Linear Programming), LSC(List Successive Cancellation) and ML(Maximum Likelihood) decoding, over different binary-input discrete memoryless channels (B-DMCs) are presented. Simulation results indicate that decoding algorithms of polar codes have...
We propose a novel EGC-STBC for a 2×2 MIMO VLC network. Compared with traditional STBC, the proposed scheme obtains similar performance with lower computation complexity. A throughput of 1.8Gbit/s is achieved, which demonstrates the feasibility for local area network applications.
Experimental demonstration of an 8-state (Turbo-) Trellis-coded modulation achieving a data throughput of 2 bits/symbol is demonstrated. TTCM outperforms Quadrature Phase Shift Keying with an OSNR gain of 3.8 dB after 1000 km at HD-FEC.
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