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In this paper, we consider the performance analysis of a decode-and-forward (DF) cooperative relaying (CR) scheme over bursty impulsive noise channel. As compared to existing literature, here, we generalize the performance analysis to the multi-relay scenario with and without considering error propagation from the relays. For this scheme, we evaluate the bit error rate (BER) performance in the presence...
Linear detectors such as zero forcing (ZF) or minimum mean square error (MMSE) are imperative for large/massive MIMO systems for both the downlink and uplink scenarios. However these linear detectors require matrix inversion which is computationally expensive for such huge systems. In this paper, we assert that calculating an exact inverse is not necessary to find the ZF/MMSE solution and an approximate...
The focus of this work is on the design of Raptor codes for continuous variable Quantum key distribution (CV-QKD) systems. We design a highly efficient Raptor code for very low signal to noise ratios (SNRs), which enables CV-QKD systems to operate over long distances with a significantly higher secret key rate compared to conventional fixed rate codes. The degree distribution design of Raptor codes...
This paper presents an extrinsic information transfer (EXIT) chart based irregular repeat-accumulate (IRA) code design technique for a two-dimensional magnetic recording (TDMR) turbo-equalizer that employs a Voronoi magnetic grain model. The channel model also includes two-dimensional inter-symbol interference (2D-ISI) and additive white Gaussian noise (AWGN). At high bit densities (e.g., between...
Multi Carrier CDMA (MC CDMA) is a stringent candidate for the next generation networks. In this paper, a multiuser detection scheme is proposed to mitigate the effects of MAI in the fading channel. Sub-optimal multiuser detection techniques are usually used owing to the exponentially increasing complexity of the optimum multiuser detector with the increase in number of users. A flexible chase algorithm...
In this paper, we propose a high-rate nonbinary multi-parallel-concatenated single-parity-check (NB-MPCSPC) code as a low-complexity coding scheme for data storage channels. The proposed scheme is composed of parallel branches of nonbinary SPC codes over a Galois Field (GF) and can be flexibly designed to achieve a wide range of code rates and codeword lengths. The encoding can be directly implemented...
In this paper, we consider the protograph low-density parity-check (LDPC) codes in two-dimensional inter two-dimensional (2D) intersymbol interference (ISI) channels, which are widely used in modeling ultra-high-density magnetic recoding systems. In particular, we study the convergence and error performance of protograph codes over 2D-ISI channels. We modify the finite-length (FL) extrinsic information...
This paper examines a method for controlling the energy of decoded signal at the recovery frame from a packet loss. Our observation unveiled that a packet loss before speech onset causes sudden increase in the amplitude of the decoded signal at the recovery frame when predictive quantization of line spectral frequency is used. To mitigate the artifact caused by the overshoot, a detector of the overshoot...
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,...
Sparse code multiple access (SCMA) is a promising multiplexing approach to achieve high system capacity. In this paper, we develop a novel iterative detection and decoding scheme for SCMA systems combined with Low-density Parity-check (LDPC) decoding. In particular, we decompose the output of the message passing algorithm (MPA) based SCMA multiuser detection into intrinsic part and prior part. Then...
The performance of coded MIMO systems can be enhanced by effectively utilizing soft iterative estimation techniques at the receiver. The main concern on this iterative techniques is computational complexity and feasibility of the hardware implementation. This paper evaluates a number of soft iterative MIMO detection schemes in terms of the bit error rate performance as well as computational complexity...
This paper describes an approach to real-time human activity recognition using hidden Markov models (HMMs) and sensorised objects, and its application to rehabilitation of stroke patients with apraxia or action disorganisation syndrome (AADS). Results are presented for the task of making a cup of tea. Unlike speech or other sequential decoding problems where HMMs have previously been successfully...
A “Dichotomous-3D” DOI PET detector design approach is proposed. The approach can potentially reduce the production cost of incorporating Depth-of-Interaction (DOI) in PET systems because the photo-sensors usage and electronic complexity would be even less than that of the current non-DOI PET detectors. The “Dichotomous-3D” approach can be implemented in two ways: (a) the Dichotomous-Offset-Quadrant-Sharing...
In this paper, a low complexity overlapped cluster search algorithm which is employed in MIMO detection is proposed. The proposed algorithm allows more than one clusters possess the same candidate constellation points to decrease the possibility of choosing the wrong cluster while picking candidates. The proposed algorithm can maintain performance within 0.57dB such that the method is suitable for...
This work analyses Polychronous Neuronal Groups (PNGs) and the possibilities of encoding and decoding information from these signals. We considered the use of single neuron coincidence detectors as decoders of PNGs and determined the total number of symbols these detectors could handle. Simulations using the Izhikevich's neuron model yielded several constraints of these systems, from which we obtained...
A low-density parity-check (LDPC)-coded multiple-input multiple-output (MIMO) systems with iterative detection and decoding (IDD) chip is integrated in 1.33mm2 in 40nm CMOS. The maximum gross throughput is 794Mb/s for a 4×4 16-QAM configuration at 288MHz. The chip dissipates 135mW at 0.9V, achieving an energy efficiency of 170pJ/bit. Compared to non-IDD receivers, composed of state-of-the art MIMO...
This paper investigates the belief propagation decoding of spatially-coupled MacKay-Neal (SC-MN) codes over erasure channels with memory. We show that SC-MN codes with bounded degree universally achieve the symmetric information rate (SIR) of arbitrary erasure channels with memory. We mean by universality the following sense: the sender does not need to know the whole channel statistics but needs...
The distributed binary hypothesis testing problem with communication and security constraints is investigated. A legitimate statistician (referred to as Bob) is interested in detecting the joint probability distribution of two remotely located sources. To this end, Bob has access to analog and coded data where the later is observed at another node (referred to as Alice) and communicated over a public...
The two-dimensional (2D) interference is a major impairment in bit-patterned media recording (BPMR) systems because of small bit and track pitches, especially at high recording densities [1]. To mitigate this problem, we introduced 2D modulation codes [2-3], which output only the hard decision, for an uncoded BPMR system (i.e., without error-correction codes). To utilize a rate-4/5 constructive inter-track...
Bit Patterned media recording (BPMR), heat assisted magnetic recording (HAMR), and shingled writing (SMR) with 2-dimensional (2-D) readback have been explored to further scale magnetic recording areal density over the next decade. However, from a signal processing perspective, all these magnetic recording technologies face a common challenge that is how to efficiently recover recorded data from the...
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