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A novel concatenated multi-input multi-output (MIMO) communication system based on time varying linear transformation (TVLT) and Tanner codes is proposed in this paper. The girth 4 property of Tanner codes is discussed briefly. Combined with the outstanding distance property of Tanner codes, TVLT can provide full diversity and maximum coding gain at the same time without exhaustive search for the...
In recent work we have incorporated self-encoded spread spectrum (SESS) in multiple-input multiple-output (MIMO) systems as a novel means to combat fading in wireless channels. In this paper, we report analytical study of the bit error rate (BER) performance of MIMO-SESS systems under Rayleigh fading. The BER expressions are derived in closed-form and the veracity of the analysis was confirmed with...
In this paper, the variational expectation-maximization (VEM) algorithm is used to provide channel estimates in a space-time decoder. The proposed estimator works for many types of space-time codes (STC), including full-rate full-diversity (FRFD) codes, Bell Laboratories layered space-time architecture (BLAST) and orthogonal STC's. The principle idea is to treat the channel coefficients as the unknown...
Full search L1-norm (FS-L1) and sphere decoding L∞-norm (SD-L∞) detectors have been previously proposed for multiple-input multiple-output (MIMO) systems as they entail a lower receiver complexity than the optimal L2-norm detector. However, the performance loss caused by application of these suboptimal detectors in additive white Gaussian noise (AWGN) has not been well investigated yet. In this paper,...
We consider the problem of finding the least-squares solution to a system of linear equations where the unknown vector has integer entries (or, more precisely, has entries belonging to a subset of the integers), yet where the coefficient matrix and given vector are comprised of real numbers. Geometrically, this problem is equivalent to finding the closest lattice point to a given point and is known...
In this paper, we present a low-complexity list sphere search algorithm for achieving near-optimal a posteriori (APP) detection in iterative detection and decoding (IDD). Motivated by the fact that the list sphere decoding searching fixed number of lattice points is inefficient in many scenarios, we design a criterion to search lattice points with non-vanishing likelihood and derive the optimal sphere...
For multiple-input multiple-output (MIMO) wireless communication system with minimum mean square error (MMSE) detection, power allocation between pilot and data symbols is investigated under MMSE channel estimation in this paper. We first propose a novel soft-output MMSE MIMO detector by taking the channel estimation error into consideration. Then, by random matrix theorem, we propose an effective...
In this paper, we propose a parallel hybrid merge-select sorting approach for the implementation of K-best list sphere detection (LSD) multi-input multi-output (MIMO) decoder based on a recently developed novel Reconfigurable Instruction Cell Array (RICA). Several popular sorting algorithms adopted in MIMO decoding are analyzed and mapped onto our proposed platform. We discuss the targeted K-best...
In this paper, an oversampled orthogonal frequency division multiplexing (OFDM) detector is proposed for multiple-input multiple-output (MIMO) underwater acoustic (UWA) communications. With simple time-domain oversampling and frequency-domain signal processing, the new oversampled OFDM (OOFDM) detector can achieve multipath diversity that is unavailable in a conventional uncoded OFDM system, while...
By modeling the corresponding MIMO channel as a factor graph (FG), STBC decoder, bit interleaver and LDPC decoder can be combined together to form a larger joint factor graph (JFG). Extrinsic information transfer (EXIT) charts and bit error rate (BER) results show that the JFG enables a shuffled decoding superior to the classical serial iterative detection in performance while reducing complexity.
Free Probability Theory (FPT) portrays a strong link between free probability and eigenvalue distributions of large random matrices. The FPT can be utilized to the digital communication systems that can be modelled by the random matrices. Especially, the asymptotic behaviour of the systems can be described by the FPT. In this paper, a new FPT detection scheme for spectrum sensing is proposed for a...
We consider in this paper high spectral efficiency bit interleaved coded modulation (BICM) MIMO system where, after serial to parallel conversion and per antenna coding, spatial data streams are simultaneously transmitted by using an antenna array. We carry out the performance analysis of an earlier proposed detection algorithm for such system which is based on the combination of linear and non linear...
Multiple-input multiple-output (MIMO) wireless technology is the key to meet the demands for data rate, quality-of-service, and bandwidth-efficiency of modern wireless communication systems. MIMO technology is therefore adopted in many recent communication standards, such as IEEE 802.11n. Here, the MIMO detector has a strong impact on the overall system performance. In fact, the full potential of...
This paper presents a pipelined MIMO detector designed for 4×4 16-QAM spatial multiplexing systems. A modified Dijkstra's algorithm and a pre-calculation technique are proposed to improve the throughput up to 2.6Gb/s, and the Euclidean norm computation is approximated to reduce the chip area without degrading the error-rate performance. The entire detector occupies 1.56mm2 in a 0.18μm CMOS process,...
A Noisy Independent Component Analysis (ICA) based method for detection in the compound system MIMO-OFDM and in the context of CDMA is proposed. Noisy-ICA algorithm is used as a post processor attached to a subspace based CDMA receiver in the presence of Gaussian noise. The proposed architecture of the detector reduces the bias caused by the channel noise and further decreases the noise by dimensionality...
In this paper, we propose a novel precoding selection criterion for coded iterative maximum likelihood (ML) detection in spatial multiplexing multiple input, multiple output (MIMO) systems. With the help of this criterion, the adaptive linear precoding technique can significant improve the system performance and provide full diversity by allowing different data stream mappings to the transmit antennas...
In this paper, we investigate the benefit of joint network-channel (JNC) distributed coding for the multiple-access half-duplex relay channel. In contrast with previous work, the orthogonality of the medium access is partially relaxed and the source-to-relay links are not error-free. More specifically, the sources are allowed to transmit simultaneously during the listening phase of the relay, while...
Quantum evolutionary complex sphere decoder algorithm (QECSDA) is proposed. A brief analysis is then given to the theoretical basis and practical performance of signal detection in multiple-input multiple-output communication systems using QECSDA. The emulation results have shown that the proposed algorithm outperforms not only the zero-forcing (ZF) detector but also the ordered successive cancellation...
The performance of spatial multiplexing-based multiple-input multiple output (MIMO) systems using zero forcing (ZF) detector in frequency selective fading channels is analyzed in this paper. The approximation of a linear combination of Wishart matrices is used to derive the probability density function (p.d.f.) of output signal-to-noise ratio (SNR) expression. Analytical error rate expressions for...
In recent publications, some special detectors were proposed to improve the performance and complexity gaps between the optimal detector and the suboptimal detector. In this paper, we propose a multistage chase detection algorithm for MIMO-OFDM systems, which use chase detection framework to design sub-detector, so the nest chase detection was implemented that can further decrease the error spread...
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