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In a PET detector using pixelated scintillator, a 511 keV annihilation photon incident on a pixel might deposit part of its energy and could be almost simultaneously detected in several adjacent pixels. These inter-crystal scattered events are typically considered invalid events in PET if their energies are not within the energy window. The purpose of this study is to develop a new position decoder...
This paper considers detection and error control coding for the two-dimensional magnetic recording (TDMR) channel modeled by the two-dimensional (2D) four-rectangular-grain model proposed by Kavcic, Huang et. al. in 2010. This simple model captures the effects of different 2D grain sizes and shapes, as well as the TDMR grain overwrite effect: grains large enough to be written by successive bits retain...
Performing joint activity and data detection has recently gained attention for reducing signaling overhead in multi-user Machine-to-Machine Communication systems. In this context, Compressed Sensing has been identified as a good candidate for joint activity and data detection especially in scenarios where the activity probability is very low. This paper augments activity and data detection for frame...
In this paper, we investigate a spectrum-sensing algorithm for detecting spatial dimension holes in Multiple-Input Multiple-Output (MIMO) transmissions for OFDM systems using Compressive Sensing (CS) tools. This extends the energy detector to allow for detecting transmission opportunities even if the band is already energy filled. We show that the task described above is not performed efficiently...
This paper explores how iterative channel estimation, symbol detection and decoding at the receiver affects the achievable capacity compared with a non-iterative, purely pilots-based scheme. First, a bound is put on the linear minimum mean-square error (LMMSE) estimator of doubly selective radio channels. Subsequently, a bound on the capacity using an LMMSE estimator is found. These bounds take into...
The scaling of Silicon devices has exacerbated the unreliability of modern computer systems, and power constraints have necessitated the involvement of software in hardware error detection. At the same time, emerging workloads in the form of soft computing applications, (e.g., multimedia applications) can tolerate most hardware errors as long as the erroneous outputs do not deviate significantly from...
We propose a new approach that achieves near maxlog optimal performance by improving soft information of the eliminated bits in reduced and fixed complexity coded multiple-input multiple-output (MIMO) systems. As a fixed-complexity MIMO detection, we consider both the QR decomposition with M-algorithm (QRM) and the fixed-complexity sphere decoding (FSD). In general, for the MIMO system with channel...
In this paper, we present a novel soft-input soft-output detector for large-scale MIMO systems that offers substantial complexity reduction over the existing detectors and performance close to the full dimensional symbol detector. The proposed algorithm, termed soft-input soft-output successive group (SSG) detector, detects a subset of symbols successively with an aid of the preprocessing designed...
In this paper, we consider a hybrid automatic repeat request (HARQ) system with bit-interleaved coded modulation over wireless channels. At higher-order modulations, bit-level combining of log-likelihood ratios (LLRs) is sub-optimal compared to symbol-level maximal ratio combining (MRC). Since symbol level combining is not always feasible, we propose novel bit-level LLR HARQ combining techniques that...
This paper presents a high-throughput, hardware-efficient iterative soft-input soft-output signal detector for spatial-multiplexing system. The detector provides near-optimal performance with much reduced complexity by adopting imbalanced tree-travel strategy, LLR correction techniques, and iteration-adaptive node-selection method. A multi-stage highly-parallel VLSI architecture is employed to implement...
Orthogonal Frequency Division Multiplexing (OFDM) is a promising technology for high data rate transmission, that is widely used in modern wireless communication systems because of its suitability for frequency selective channels. However channel time variations destroy the orthogonality between sub-carriers resulting in Inter-Carrier Interference (ICI), that degrades performance in OFDM. Various...
In this paper, we propose multi-carrier code division multiple access (MC-CDMA)-aided space-time shift keying (STSK) for mitigating the performance erosion of the classic STSK scheme in dispersive channels, while supporting multiple users. The codewords generated by the STSK scheme are appropriately spread in frequency-domain (FD) and transmitted over a number of parallel frequency-flat subchannels...
In wireless networks, interference from adjacent base stations is usually a dominant factor for user performance degradation. A maximum likelihood (ML) detection can provide superior performance by jointly detecting the serving and interfering signals. However, the complexity is extremely high. This paper presents a soft tree pruning based fixed-complexity sphere decoder. It uses reliability information...
SRAM memory cell is considered to be more suitable for designing memory, particularly, cache memory. A reliable memory system that can tolerate multiple transient errors in the memory words as well as transient errors in the encoder and decoder (corrector) circuitry is to be introduced. Such novel development is the fault-secure detector (FSD), its error-correcting code (ECC) definition and associated...
We propose a novel joint channel estimation and three-stage iterative detection/decoding scheme for near-capacity MIMO systems. In our scheme, as usual, the detected soft information is first exchanged a number of times within the inner turbo loop between the unity-rate-code (URC) decoder and the MIMO soft-demapper, and the information gleaned from the inner URC decoder is then iteratively exchanged...
Recently, a variety of low complexity soft-input soft-output detection algorithms have been introduced for iterative detection and decoding (IDD) systems. However, it is still challenging to implement soft-input soft-output detector detector at feasible complexity for massive MIMO systems due to the heavy burden in computational complexity. In this paper, we present a novel soft-input soft-output...
AC-3 audio compression find applications in home cinema, DVD, BD and digital television. This paper addresses the challenge of transparently watermarking AC-3 bit streams instead of the conventional decoding — baseband watermarking — re-encoding approach. We discuss the alternate possibilities to embed watermarks by altering the MDCT coefficients delivered in the bit stream, which consists of mantissas...
In this paper we propose a new noncoherent relay selection strategy for two-way relay cooperative networks. In our proposed scenario, channel state information (CSI) or feedback link is not needed, neither for relay selection nor for data detection. We assume Mary frequency shift keying (FSK) modulation for our transmission scheme and decode-and-forward (DF) protocol for our system relaying method...
This paper proposes a soft-detector with near-maximum likelihood (ML) performance in multiple-input multiple-output (MIMO) systems. The proposed detector performs an initial detection for candidate vectors by applying a low complexity channel matrix ordering. The detection order then is diversified to extend the list of candidates, from which high-quality soft-output can be generated. In addition,...
Maximum likelihood detection (MLD) has been shown to offer large performance gains within the context of linearly precoded MIMO-OFDM systems with multiple-stream transmission when compared to an all-linear setup (i.e., linear transmitter/receiver), although at the cost of a higher computational complexity. To overcome this handicap, this paper proposes a method to selectively choose the detection...
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