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A compensation-based user scheduling (CBUS) for multiuser multi-input multi-output (MU-MIMO) systems with delayed feedback channel state information (CSI) is proposed. To cope with the great performance degradation caused by imperfect CSI in the selective transmission/ selective combining (ST/SC) transceiving systems, we propose the CBUS algorithm, which can effectively alleviate the effect of time...
The rapid increasing demands of wireless multimedia applications have boosted the developments of video delivery technologies with cross-layer designs, driven by optimizing quality of experiences (QoEs) of end users. In this paper, a near optimal power allocation scheme, targeting at maximizing QoE, is proposed for transmitting scalable video coding (SVC) based videos over multi-input multi-output...
An efficient component-interleaved nonbinary Low Density Parity Check Code (LDPC) scheme is proposed, which can significantly outperform the binary LDPC codes scheme without a component interleaver on fading channels. In this paper, the bit-error-rate (BER) performances of nonbinary LDPC codes are compared with the binary LDPC codes on the independent Rayleigh fading channel. And then we use a fast...
Since the dynamic range of state metrics is limited due to the finitude of their quantization, it is needed to take an anti-overflow operation in the implementation of Turbo decoder. In traditional methods, plenty of calculations should be done for the anti-overflow protection in a single cycle, which greatly restricts the actual running clock frequency, thus to bring a strong impact on the final...
Based on the good degree distribution of a kind of irregular repeat accumulate (IRA) code, the base check matrix is designed according to quasi-cyclic method, and the length-4 short circles are eliminated. The obtained IRA code has flexible code length from 150 to 6000, with link-level performance close to the LDPC code specified by IEEE802.16e standard. The proposed IRA code family is suitable for...
Power line communications (PLC) play an important role in smart grid for its cost efficiency. However, the power line is not designed for communication purposes so that its communication environment is hostile with formidable obstacles such as frequency selective fading and impulsive noise. A number of existing methods have been used to deal with the challenges of PLC. Nevertheless, most of existing...
Multi-input multi-output (MIMO) is an attractive solution to high data rate underwater acoustic communications (UAC) with limited bandwidth. However, the long delay spread characteristic of UAC channels makes the equalization challenging for those MIMO schemes. Although maximum likelihood sequence estimation (MLSE) is known to be optimum and is intensively used in many terrestrial wireless applications,...
In this paper we evaluate the use of parallel interleavers for user separation in coded IDMA systems. The parallel interleavers have previously been evaluated for uncoded systems, and we here present extended results for the coded case. The new results are important for real systems, as they will most likely use performance enhancing channel coding. The parallel interleavers are designed to remove...
In this paper, we propose a parallel interleaver design for interleave-division multiple-access (IDMA) systems. The advantages of our approach are the low complexity induced from an algebraic solution and the parallel processing with negligible performance degradations against random interleavers. It is specially suitable for parallel implementation of multiple user detections and decoding of IDMA...
Turbo codes are widely used in many radio systems due to its superior performance and Software Radio (SR) is an emerging paradigm of the wireless communication system design due to its good flexibility and adaptability. However, since turbo decoding is computationally intensive, the SR implementation of turbo decoding is always challenging. In this paper, an efficient software implementation of the...
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