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In this paper, we propose a complexity reduced soft bit estimation for iterative multiple-input multiple-output (MIMO) system with linear order of complexity. A maximum likelihood (ML) detection achieves the maximum performance, but its complexity increases exponentially by the number of antennas and modulation orders. In this paper, we propose an efficient soft bit estimation method for iterative...
Power wastage in dense WLANs is a challenging problem. In order to reduce the power wastage, AP switching on/off strategies have been developed, aiming at decreasing the number of active APs (according to the traffic conditions). The efficiency of such strategies is strongly dependent on the efficiency of detecting WLAN users communication attempts, as a trigger for switching on the inactive APs....
In this paper, a novel setpoint-based design approach for Irregular Repeat Accumulate (IRA) codes in iterative detection and decoding structures is presented. In contrast to conventional IRA code design in which the convolutional decoder is combined with the detector, the goal behind this approach is to keep the IRA decoding structure consisting of convolutional decoder and repetition decoder intact,...
In this paper, we propose a non-binary belief propagation approach (NB-BP) for detection of $M$-ary modulation symbols and decoding of $q$-ary LDPC codes in large-scale multiuser MIMO systems. We first propose a message passing based symbol detection algorithm which computes vector messages using a scalar Gaussian approximation of interference, which results in a total complexity of just $O(KN\sqrt{M})$,...
In this paper, we propose an expectation propagation based iterative multi-user detection algorithm for multiple input multiple output interleave-division multiple access (MIMO-IDMA) systems with high-order modulation. The proposed detector can be well integrated into the traditional structure of turbo receivers for MIMO-IDMA systems. By formulating a scalar factor graph representation of the multi-user...
The highly parallel 2D-clustering FPGA implementation used for the input system of the Fast TracKer (FTK) processor for the ATLAS experiment of the Large Hadron Collider (LHC) at CERN is presented. The LHC after the 2013–2014 shutdown periods is planned to have increased luminosity, which will make it more difficult to have efficient online selection of rare events due to the increase of the overlapping...
We propose an Iterative Detection and Decoding (IDD) scheme with Low Density Parity Check (LDPC) codes for Multiple Input Multiple Output (MIMO) systems in block-fading receivers and fast fading Rayleigh channels. An IDD receiver with soft information processing that exploits the code structure and the behaviour of the log likelihood ratios (LLR)'s is developed. Minimum Mean Square Error (MMSE) receivers...
One of the aims of brain-computer interface (BCI) is to restore the means of communication for people suffering severe motor impairment, anarthria, or persisting in a vegetative state. Yes/no decoding with the help of an imaging technology such as functional near-infrared spectroscopy (fNIRS) can make this goal a reality. fNIRS is a relatively new non-invasive optical imaging modality offering the...
In this paper we have classified two movement intensions (left and right) using mental arithmetic and mental counting for development of brain-computer interface (BCI). Mental arithmetic task was associated to left movement intension and right movement intension was acquired using mental counting. The brain signals of four healthy subjects were acquired using functional near-infrared spectroscopy...
In this paper, an efficient iterative receiver for digital communication systems is investigated. It combines a Non-Binary Low-Density Parity-Check (NB-LDPC) decoder with a high-order constellation demapper and a Multiple-Input Multiple-Output (MIMO) detector. A suboptimal MIMO detector based on the Belief Propagation (BP) algorithm is investigated as an alternative to a Maximum Likelihood (ML) detector...
Digital Load-Side Transmission (DLT) is a two-wire bound power line communication methodology that has been specifically developed for general lighting applications and transmits data over mains. This paper proposes three DLT receiver concepts and compares them to one other regarding robustness, complexity and power consumption. All of these detectors have been realized and tested in hardware. To...
Massive multiple-input multiple-output (MIMO) is expected to be a key technology in next-generation multi-user cellular systems for achieving higher throughput and better link reliability than existing (small-scale) MIMO systems. In this work, we develop a novel, low-complexity iterative detection and decoding algorithm for single carrier frequency division multiple access (SC-FDMA)-based massive...
The research and development on in-vehicle networks (IVNs) is driven by two main requirements: bandwidth and robustness. In this paper we address the robustness requirement. We focus on FlexRay IVNs that are used for safety-critical applications. We analyze and discuss faults that may affect the startup and operation of a FlexRay network. These failures may not only occur during the startup phase...
Two-dimensional magnetic recording (TDMR) is expected to drive continued areal density growth of hard-disk drives (HDDs) as the growth for conventional perpendicular magnetic recording (PMR)-based HDDs is slowing down. Feasibility of manufacturing more than one reader in a single head has hastened the development of TDMR and considerable effort is underway in developing read channels that can exploit...
Performing joint activity and data detection has recently gained ubiquitous attention for reducing signaling overhead in multi-user Machine-to-Machine Communication systems. To this end investigations on the application of Compressed Sensing have focused on estimating data and node activity jointly in scenarios where the per node activity is very low. The focus of this paper is to enhance the performance...
In our previous work, it was shown that the conventional approximate Bayes' theorem based probabilistic data association (PDA) algorithms output “nominal APPs”, which are unsuitable for the classic architecture of iterative detection and decoding (IDD) aided receivers. To circumvent this predicament, in this paper we propose an exact Bayes' theorem based logarithmic domain PDA (EB-Log-PDA) method,...
We have proposed a novel center-of-gravity (COG) time-over-threshold (TOT) method for PET detectors readout. In order to reduce the output channels it uses the charge division architecture and all the detector signals will be read out and multiplexed into 3 TOT outputs. The COG position can be decoded from the TOT information only without causing too much distortion. This method has very simple structure...
A multi-core FPGA-based 2D-clustering algorithm for real-time image processing is presented. The algorithm uses a moving window technique adjustable to the cluster size in order to minimize the FPGA resources required for cluster identification. The window size is generic and application dependent (size/shape of clusters in the input images). A key element of this algorithm is the possibility to instantiate...
We have successfully developed a new high-resolution PMT-Quadrant-Sharing (PQS)[1] PET panel detector system. Each bank consists of 48 × 112 LYSO detector elements with a pixel size of 2.35 × 2.35 × 15.5 mm3. After grinding a regular detector bank into a half pentagon shape with tapered-end crystals, 24 half pentagon banks will form a gapless cylindrical ring with 87-cm in diameter and 27.6-cm in...
Positron emission tomography (PET) is typically based on 2-D array of scintillation crystals and light sharing technique decoded by Anger-logic. The decoded result is a pseudo-position of the gamma interaction. A crystal position map generated from the flood histogram is used as a crystal look-up table (CLT) to assign each pseudo-position to a specific crystal. For the light sharing based PET detector...
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