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Low-density parity-check (LDPC) codes of column weight two, also called cycle codes, can be constructed based on connected simple graphs. In this paper, efficiently encodable cycle codes and modified Repeat-Accumulate codes based on Hamiltonian graphs with large girths are devised. Specifically, the Hamiltonian property of the graphs is exploited to obtain efficient encoder structures and a concise...
In this paper, A new cross-layer design combining of adaptive modulation coding (AMC) with hybrid automatic repeat request (HARQ) based on rate-compatible low-density parity-check codes is proposed. In physical layer the AMC adjusts the data rates roughly according to the CSI by choosing different modulation mode. In data link layer HARQ adjusts the data rates accurately according to the CSI by changing...
Network coding can facilitate the communications from a sender to a set of receivers in a network by enlarging the multicast throughput. However, when applying network coding in practical network, problems such as link delay, delay jitter, and random link loss may seriously impair the network coding based multicast communications. In this paper, we carefully analyze the insufficiencies of the existing...
In this paper, we proposed a new method for constructing quasi-cyclic low-density parity-check (QC-LDPC) codes based on circulant permutation matrices via the one-coincidence sequences. The main advantage is that QC-LDPC codes with a variety of block lengths and rates can be easily constructed with no cycles of length four or less. Simulation results show that the proposed QC-LDPC codes perform slight...
Parallel-input parallel-output (PIPO) structure for quasi-cyclic low-density parity-check (QC-LDPC) codes is proposed in this paper to implement a faster and more efficient QC-LDPC encoder than that based on conventional serial-input parallel-output (SIPO) or parallel-input serial-output (PISO) structure. An encoding architecture based on the proposed PIPO structure for multi-rate QC-LDPC codes employed...
This paper presents a decision-feedback-equalizer for 10-Gb/s backplane transceivers for highly lossy channels. Forward equalization is not used in order to avoid noise enhancement. The sampling phase is optimized to achieve maximum signal-to-noise-ratio at the sampling instants. The coefficients of feedback finite-impulse-response filter and the gain of variable-gain-amplifier are obtained automatically...
Error-control coding (ECC) is a classic approach to save transmission energy in wireless sensor networks (WSN). In this paper, we consider a single-hop wireless sensor network, where Repeat-Accumulate (RA) codes are utilized. RA codes, which are asymmetric codes with low encoding complexity and high decoding complexity, are applied to WSN for the transmission from sensors to the base station. Experiments...
Testbench generation is of great importance for function verification of RCA. Traditional testbench generation using pseudo-random method is not very effective; so many other generations have been developed. In this paper, genetic algorithm based generation with syntax restriction is introduced at length. The method with syntax restriction not only generates more executable testbenches for reconfigurable...
In this paper, a scheme of signal space diversity based on non-binary LDPC codes is presented. Signal space diversity can provide good performance gains over fading channels with multi-dimension rotated constellation. This paper studies the extension of such schemes with a non-binary code. It is shown that non-binary LDPC-coded modulation with signal space diversity over a fading channel may lead...
Combining linear feedback shift register (LFSR) and Johnson folding counter, a dual-encoding built-in self-test (BIST) design with low power consumption based on clock gating is proposed. Firstly, folding counter feeds were encoded by LFSR, and secondly deterministic test patterns were generated by using the selected fold distance from ROM. Also, with the specialized encoder and clock gating, these...
The hierarchical B-picture coding is introduced into the extension of H.264/AVC in order to improve coding performance and provide strong temporal scalability as well. In general, coding performance is affected by the content variation in GOP. Therefore, the ways to determine the size of GOP (group of picture) is a critical problem for video coding. In this paper, the adaptive GOP structure determination...
This paper proposes a parallel architecture design for motion estimation (ME) by using the new three step search (NTSS) block-matching algorithm. The proposed NTSS-based parallel architecture adopts the partition technique to separate the encoded frame into two parts for operating. By using the partition technique, the search time of the proposed NTSS-based parallel architecture can be reduced more...
This paper presents a high performance and low cost architecture for H.264/AVC baseline profile entropy encoder. In the proposed design, an efficient method is used to design CAVLC to reduce the hardware cost. The regularity of nC calculation allows the architecture in reducing area. With the synthesis constraint of 100Mhz clock, the logic gate count of the proposed design is 16K gates based on a...
From system-on-chip (SOC) perspective, memory bandwidth plays an important role in system performance for video coding applications. Owing to the locality of video data, the data reuse scheme is widely applied to reduce the memory bandwidth requirement. For further improvement of performance, frame-based data reuse scheme, single reference frame and multiple current macroblocks (SRMC), can provide...
H.264/AVC standard employs some advanced technologies that can provide high coding efficiency to reduce the video bit-rate. This paper presents an effectively adaptive group-of-picture (AGOP) coding control for H.264/AVC system based on the temporal correlation. We efficiently estimate the parameter of temporal correlation and to decide the quantization scale. The I-frame is adaptively replaced by...
In this paper, the discrete wavelet transform, the complex wavelet transform, and the wavelet packet transform are applied to denoise G and C binary indicator-type of DNA sequences derived from both the Voss representation and the Z curve representation. The technique aims to reveal coding and non-coding regions of genes in a DNA sequence. DNA sequences of four selected model organisms including a...
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