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It is known that by extracting log-likelihood ratio (LLR) values from the received MIMO signals, a MIMO detector is able to exchange a posteriori soft information with a channel decoder to improve the error performance. A minimum mean-square error with parallel interference cancellation (MMSE-PIC) detector is considered to be a practical MIMO detector, but the computational complexity for the LLR...
This paper presents a listed maximum mutual information increase (LM2I2)-based algorithm, which is used to arrange low-density parity-check (LDPC) decoding schedules for faster convergence. The increments in the predicted mutual information for the messages to be updated is used to guide the arrangement of the fixed decoding schedule. Consequently, by looking ahead for several decoding stages, a high-order...
A Class-G headphone amplifier for hi-fi audio playback with high immunity to supply disturbance and Class-G switching noise is presented that achieves 130dB PSRR at 217Hz and higher than 100dB PSRR up to 20kHz. In addition, a Class-G amplifier with load-adaptive voltage supply rails selection and Class-G switching scheme improves the power efficiency for different impedances. Realized in 0.18μm CMOS,...
We consider a multiuser scenario with a center node for data fusion, where simultaneously transmitting is required in real time and with low probability of interception. We established a novel multiple access scheme, named matrix division multiple access (MDMA), based on OFDM technology. Precoded with different matrices, the signal from different end nodes can be distinguished due to the signal space...
In the encoding of Luby transform (LT) codes, information bits (variable nodes) are randomly connected to the check nodes. Although the check-node degrees have been optimized for error-rate performance, the arbitrary connections in the code graph cannot guarantee efficient propagation of the channel information (intrinsic messages), and may slow down the convergence speed of the iterative decoding...
Recently, a turbo-coded noncoherent space-time modulation scheme, which is aimed at providing both a high data transmission rate and a low receiving complexity, was proposed for noncoherent block fading channels. However, in cases where a large number of transmit antennas exist, the turbo code does not match well with the noncoherent space-time modulation scheme, and results in performance degradation...
Luby Transform (LT) codes are a new member in the family of forward error correction codes without a fixed code rate. The property called rateless is attractive to researchers in last decade, and lots of studies have been proposed and attempted to improve the performance of LT codes. One variation is the use of a sparse degree distribution instead of a full one referred to in the encoding process...
As part of the tradeoff between error performance, decoding complexity and the overhead of rateless codes, the combination of incremental decoding (ID) and informed dynamic scheduling (IDS), known as IDIDS (incremental decoding with informed dynamic scheduling), is an attractive solution in binary symmetric channels (BSC). However, applying IDIDS in the AWGN (additive white Gaussian noise) channel...
In this paper, a new spectral precoding scheme is developed for constant-envelope orthogonal frequency-division multiplexing (CE-OFDM) signals to provide very small power spectral sidelobes. It is shown that the proposed spectrally precoded CE-OFDM scheme can provide higher spectral compactness than previously designed spectrally precoded CE-OFDM block scheme and continuous-phase CE-OFDM scheme.
Luby Transform code (LT code) has been a popular and practical technique in the field of channel coding since its proposal. One of the key components of LT code is a degree distribution which is used to determine the relationship between source data and codewords. Luby in his proposal suggested two general methods to construct feasible degree distributions. Such general designs work appropriately...
Luby Transform code (LT code) is the first practical digital fountain code and has been widely used as basic components in many communication applications. The coding behavior of LT code is mainly decided by a probability distribution of codeword degrees. In order to customize a degree distribution for different purposes, multi-objective evolutionary algorithm is introduced to optimize degree distributions...
In this paper, we propose to approach the capacity limit for channels with fast phase variation by using a serial concatenation scheme with an outer turbo encoder and an inner block modulator. A distinct feature of the proposed transmission scheme is that coded symbols from adjacent codewords are interleaved into the same input vectors of the block modulator. At the receiver, we not only perform the...
For the decoding of a binary block code of Hamming distance of d over AWGN channels, a soft-decision decoder is said to achieve bounded-distance (BD) decoding if its squared error-correction radius is equal to d. A Chase-3-like algorithm outputs the best (most likely) codeword in a list of candidates generated by a conventional algebraic binary decoder whose input sequences have nonzero entries confined...
With rapid advances in multimedia and wireless network technologies, it is now feasible to provide live video streaming over wireless networks. However, since bandwidth is a scarce resource in wireless networks, it is important to design an adaptive bandwidth allocation scheme for video streams to make efficient use of wireless bandwidth. In this paper, we propose an adaptive bandwidth allocation...
In this paper, we propose to mitigate the effect of inter-symbol interference (ISI) by first interleaving symbols labelled by bits in one codeword with symbols respectively labelled by bits in the two adjacent codewords and then transmitting the interleaved symbol vectors through the ISI channel. At the receiver, we not only perform turbo equalization between the equalizer and the channel decoder,...
A Blue-ray Disc (BD) player, back-end SoC supporting multiple protection, video and display formats is fabricated in a 90 nm 1P7M CMOS process with a core area of 62.95 mm2. This SoC adopts a general copy protection (GCP) unit to integrate various kinds of protection algorithms (e.g. AES, CSS, CPPM/CPRM, DES, SHA-1/MD5), designs a dedicated memory management unit (MMU) for realizing multiple video...
While CD, DVD and Blu-ray disc (BD) are on the market, attempts are being made by industry and research facilities to further increase the storage density for the next or 4th generation of optical storage. The objective is an increase by a factor of 3...4 compared to BD. The European funded project MobileDrive/4GOOD (4th-Generation, omni-purpose optical disc-system) chose the super-resolution near-field...
It is recently of interest to design Chase-like algorithms to achieve BD decoding with as least trials as possible. In this paper, we show that Chase-like algorithms can achieve bounded-distance decoding with only O(radic(d ln d)) trials, where d is the minimal Hamming distance of the code.
In this paper, we study and analyze the computational complexity of deblocking filter in H.264/AVC baseline decoder based on SimpleScalar/ARM simulator. The simulation result shows that the memory reference, content activity check operations and filter operations are known to be very time consuming in the decoder of this new video coding standard. In order to improve overall system performance, we...
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