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In this paper, the problem of relay selection is considered for a wireless network consisting of one transmit source, one destination and R relays. For such a network, assuming that channel state information is available, we propose a new multiple relay selection approach. In our approach, the receive quality-of-service at the destination is maximized while keeping the individual relay transmit power...
Shaping gain for trellis shaping is presented in LDPC-coded QAM DSL system. A labelling scheme is designed for current constellations to derive regional shaping effects. The performance of BER results are investigated for various QAM orders from 256QAM to 32768QAM. It is found that for even bits QAM the shaping gain is more evident than odd bits QAM, especially when the QAM order is high; and larger...
The end-to-end latency in 5th generation (5G) wireless communication is required to be less than a millisecond for delay sensitive scenarios, which becomes a serious constraint for the designing of 5G Turbo decoder. Traditional Turbo decoders primarily concern on throughput and resource consumption, which leads the latency unoptimized. This work targets on minimizing the decoding latency with the...
A new strategy of belief propagation (BP) decoder for LDPC codes is presented by sequentially concatenating the scheduling algorithms of flooding and node-wise residual belief propagation (NW RBP) without increasing the complexity of hardware implementation. Compared to NW RBP, the concatenated BP decoder significantly decreases the decoding latency caused by computing and sorting the residual of...
The fifth-generation (5G) is coming. Quo vadis 5G? What architectures, network topologies and technologies will define 5G? Are methodologies to the analysis, design and optimization of current cellular networks still applicable to 5G? The proposed tutorial is intended to offer a comprehensive and in depth crash course to communication professionals and academics. It is aimed to critically illustrate...
A robust transceiver design with Tomlinson-Harashima precoding (THP) for QR decomposition (QRD)-based multiuser multiple-input multiple-output (MU-MIMO) relaying systems is proposed, which exploits the relationship between QRD and Gram-Schmidt orthogonalization (GSO) to jointly optimize the transmit precoder and receive beamforming vectors of users. Then we propose a correlation-based approach which...
The paper investigates a buffer-aided relay selection scheme for an underlay cognitive radio network in the presence of an eavesdropper. Eavesdropper can intercept the information transmission from the secondary source or the relay to the corresponding receiver. Relay is equipped with a buffer of finite buffer size so that it can store packets. We propose a max-ratio secure link selection scheme which...
In this paper, the impairment of a Coded OFDM (COFDM) signals has been evaluated through simulation imposing various severe channel constraints in combination of Additive White Gaussian Noise (AWGN), AWGN with Inter carrier Interference (ICI) due to Carrier Frequency Offset (CFO) and AWGN with ICI having various m parameters of Nakagami-m fading distribution. Since Reed-Muller codes, with Golay Complementary...
In the space Disruption-Tolerant Network (DTN), high-speed relative motion between the spacecraft-piggybacking nodes leads to rapid changes of link range, which incurs the time-varying properties of such channel parameters as Signal-to-Noise Ratio (SNR) and One-Way Light Time (OWLT). In this paper, we propose a joint optimization algorithm for bundle and segment sizes, which can update optimal sizes...
Compressed sensing (CS) theory provides a new solution for the possibility of using impulse radio ultra-wideband (IR-UWB) for high-precision time of arrival (TOA) estimation. Because of the sparsity of IR-UWB signals, the CS theory enables the reconstruction of signals from a small set of random measurements at a sub-Nyquist rate. In current studies involving CS-based sampling architectures, the quantization...
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