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Quasi-cyclic low-density-parity-check (QC-LDPC) codes are jointly designed for cascade-based multisource coded cooperation system. Firstly, QC-LDPC codes based on the base matrix and exponent matrix are introduced, and then two types of girth-4 cycles in QC-LDPC codes employed by the sources and relay are explicated. Secondly, we propose joint design method of QC-LDPC codes employed by the sources...
A new transmission scheme is designed to maximize average spectral efficiency in a MIMO link considering instantaneous bit error rate (BER) and total power constraints. Discrete link adaptation using adaptive modulation and coding (AMC) is utilized to combat multipath fading which is implementable in practical systems. ZF receiver is employed by which MIMO channel becomes equivalent to several parallel...
We propose an indoor visible light communication system model in the paper. By researching several kinds of commonly used modulation methods through the analysis of two channels: diffuse and LOS channels, we established a general indoor visible light communication transmission model and the corresponding modulation communication mode under the condition. A solution to improve intersymbol interference...
Work presented in this paper investigates the feasibility of Continuous-Phase Quaternary Frequency Shift Keying (CP-QFSK) with limiter-discriminator detection modem as a viable dual data rate system that can be employed in TDMA short range communications systems. It offers a great deal of spectral efficiency in multi-channel systems, hardware simplicity and robustness to adjacent Channel Interference...
We present forward error correction systems based on a low-complexity LDPC decoding algorithm and randomly-structured LDPC codes. Simulation and ASIC synthesis results show throughput and net coding gain sufficient for long-haul applications, with greatly reduced energy consumption.
We apply linear block-codes across 228-bit, PDM-64QAM spatial super-channels in a 19-core fiber and observe upto 3 dB reduced OSNR requirement and additional transmission reach of 55% at BER=3.8×10−3 and 122% at BER=1×10−3 for a 10.5% code overhead.
By pairing the mid and edge sub-bands of each channel, the penalty due to inter-channel-interference can be mitigated for a superchannel. Experimental results show that the proposed method offers 1.5-dB Q2 improvement after 3840-km transmission with 1GHz channel overlap.
Through the expansion of non-Gray-mapping symbols, the pre-FEC and post-FEC Q-factors of the proposed optimized Circle-8QAM outperform Circle-8QAM and Star-8QAM by ∼0.3 dB and ∼0.6dB at the coding rate of 0.8 in experiments.
We propose a class of Alamouti-like Orthogonal Space-Time Block Codes (STBC) for two additional information bits without source such as power, bandwidth and time slot. To maintain the full rank property of the coding gain matrix, we propose a set of STBCs for 4 transmit antennas transmission to transmit one additional information bit achieving rate-9/8. Another orthogonal STBC code with rate-1 is...
Iterative decoding of orthogonal convolutional code is widely used for its excellent performance. However, the iterations lead to high complexity and long decoding delay, which is unsuitable for low- rate voice service in mobile satellite communications with on-board processing. In this paper, a novel scheme of orthogonal convolutional coding as well as an associated non-iterative joint decoding algorithm...
In this paper, we propose an efficient scheme to construct LT codes that can provide unequal error protection (UEP) property. We implement low rate LDPC codes instead of the duplication and utilize a low constant average degree distribution with high intermediate symbol recovery rates (ISRR) to improve the performance of more important bits (MIB). Asymptotic analysis of the proposed scheme is obtained...
This work investigates a technique of high data transmission rate over wireless communication system. Now a day's higher bandwidth demand has been increased and with the minimum tolerance of error. To enhance available bandwidth and improve the quality of transmission convolution codes are used on the OFDM (Orthogonal frequency division multiplexing) wireless communication system over AWGN channel...
A novel framework called distributed compressive video sensing (DCVS), combining distributed video coding (DVC) and compressive sensing (CS), directly capture the raw video data as measurements with low-complexity and low-cost process. It meets the requirements of distributed system very well, because of its resource consumption shifting from encoder to decoder. Nevertheless, the issue of measurements...
Transform Domain Communication System (TDCS) has been proposed as a new candidate applied in the cognitive radio (CR) environment since it can avoid existing users or jammers intelligently over a given bandwidth. The TDCS achieves noise-like property and orthogonality characteristic by generating a PR phase vector through a random phase coding processing. In this paper, a new implementation of TDCS...
In this paper the robustness of the receiver architecture of GSM/EDGE modems is experimentally tested. GMSK and 8PSK modulated signals are used to simulate interference sources on adjacent channels. The results can help to fathom the boundaries for future spectrum allocation strategies leading to more efficient utilization of the available spectrum.
Transmitted reference pulse cluster (TRPC) structure was proposed as an improved transmitted reference (TR) signaling for low date-rate ultra-wideband (UWB) communications. In the uncoded case, TRPC outperforms the conventional TR and non-coherent pulse position modulation (NC-PPM) signaling schemes. Moreover, it overcomes the implementation problem of the long delay line inherent in the conventional...
The bit-error-rate (BER) performance of a 5 × 5 dispersion code multiple access system (DCMA) is numerically investigated assuming Chebyshev dispersion group delay coding. It is found that odd Chebyshev coding features lower BER than even Chevyshev coding between dispersion matched pairs within the DCMA system. This is the first study of a full DCMA communication system.
This paper proposes a physical layer coding scheme to secure communications over the Gaussian wiretap channel. This scheme is based on non-systematic Rate-Compatible Low-Density-Parity-Check (RC-LDPC) codes. The rate compatibility involves the presence of a feedback channel that allows transmission at the minimum rate required for legitimate successful decoding. Whenever the decoding is unsuccessful,...
We show how a single spatially coupled LDPC code constructed from an optimized protograph with optimized windowed decoding outperforms different conventional LDPC codes in iterative differential decoding with significantly lower error floors and identical complexity.
We compare hybrid turbo differential decoding with other FEC-schemes that reduce the penalty usually associated with differential encoding applied for cycle slip mitigation. We discuss implementation aspects and show robust FEC-performance in nonlinear transmission experiments.
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