The methods of adaptive and robust signal processing in the system of space-time coding are considered. The urgency of this problem in active radar installations and communication systems is shown.
ISBN:
(纸本)9781728103396
The methods of adaptive and robust signal processing in the system of space-time coding are considered. The urgency of this problem in active radar installations and communication systems is shown.
In order to improve the reliability of the aircraft telemetry communication in complex attitude conditions, a system model with concatenated LPDC space-time codes and a 2 × 1 antenna system is established. A chan...
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Multiple Input Multiple Output (MIMO) uses the multiple antennas at transmitter and receiver to improve the spectral efficiency of the communication system. In this paper, an overview of implementing MIMO is described...
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ISBN:
(纸本)9781538646496
Multiple Input Multiple Output (MIMO) uses the multiple antennas at transmitter and receiver to improve the spectral efficiency of the communication system. In this paper, an overview of implementing MIMO is described while meeting the challenges of current communication systems such as channel estimation, baseband synchronization, and local oscillator synchronization. The paper begins with the system model designed at both transmitter and receiver using the space-time coding. Developed algorithms are also discussed for improving the throughput and spectral efficiency of the designed system. We particularly focus on finding the probability of bit error rate with the variation on the TX-RX distance and comparing with other MIMO implementations. Finally, we analyze the performance of the received signals based on several metrics such as quadrature skew, IQ gain imbalance, modulation error ratio, phase offset, frequency drift, frequency offset, phase error in peak and magnitude error in peak before and after using space-time wireless coding with the 16-QAM modulation scheme. All the algorithms designed are implemented using the Universal Software Radio Peripheral (USRP) testbed using Software Defined Radio (SDR) platform with LabVIEW software.
Recent results have shown that the recently proposed Orthogonal Chirp Division Multiplexing (OCDM) system outperforms OFDM under frequency-selective channels in single-input single-output case. In this work, we invest...
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ISBN:
(纸本)9781728136271
Recent results have shown that the recently proposed Orthogonal Chirp Division Multiplexing (OCDM) system outperforms OFDM under frequency-selective channels in single-input single-output case. In this work, we investigate the viability of OCDM in a multiple-input multiple-output case with different spacetimecoding techniques. In particular, we consider: Alamouti, cyclic delay diversity (CDD) and Alamouti with CDD (ACDD) techniques. The contribution of this paper is twofold. Firstly, we provide a comprehensive model for ACDD, which for the best of the authors' knowledge is not available in the literature. Secondly, we evaluate this model in a vehicular communication scenario based on ITS-G5 standard, and we show that OCDM outperforms OFDM in terms of frame error rate performance.
Spatial modulation (SM) is introduced into layered space-time coding (L-STC) used in image sensor (IS)-based visible light communication (VLC) systems. STC was basically investigated for extending the communication ra...
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Spatial modulation (SM) is introduced into layered space-time coding (L-STC) used in image sensor (IS)-based visible light communication (VLC) systems. STC was basically investigated for extending the communication range of the IS-based VLC link [10], although it is out of the range when IS receivers are at the long distance from the LED array of the transmitter where the number of pixels capturing the transmitter on the image plane is less than the number of LEDs of the array. Furthermore, LSTC was done in [11] for increasing the reception rate with improving the pixel resolution while the receiver was approaching the transmitter. In this paper, SM is combined into L-STC by mapping additional information bits on the location of the pair of STC bit matrices of each layer. Experimental results show that additional SM bits are extracted with no error, without deteriorating the reception quality of and shrinking the transmission range of the original L-STC.
space-division multiplexing (SDM) is becoming essential to increase the capacity of future optical communication systems. Propagating modes through multimode fibers are affected by a non-unitary crosstalk known as mod...
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space-division multiplexing (SDM) is becoming essential to increase the capacity of future optical communication systems. Propagating modes through multimode fibers are affected by a non-unitary crosstalk known as mode dependent loss (MDL), that requires either optical or digital signal processing solutions to be reduced. space-time (ST) coding designed and used for wireless communications was proved to be efficient to reduce polarization-dependent loss in PolMux systems and MDL in SDM systems. In this letter, we study a complete transmission scheme, including forward error correction (FEC) and ST coding. FEC is used to protect the transmission from errors, but in the presence of MDL, system's performance is reduced. We show by simulations and error probability derivation that coding gain summation is obtained, which makes both codes essential for the next generation of optical transmission systems.
Two-path successive relaying is used as a method of transmission for recovering the bandwidth loss of conventional relay networks. In this paper, a new beamforming method is employed alongside the proposed distributed...
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ISBN:
(纸本)9781509050499
Two-path successive relaying is used as a method of transmission for recovering the bandwidth loss of conventional relay networks. In this paper, a new beamforming method is employed alongside the proposed distributed space-time coding (DSTC) transmission scheme in a two-path successive relay network which enjoys SNR-based selection relaying protocol. A closed-form expression for the end-to-end bit error rate (BER) of the system is derived. Regardless of the fading in inter-relay channel, the proposed scheme ensures that full rate and full diversity can be attained in the presence of decoding errors at the relay nodes. Simulation results, show a significant power saving about 2.5 dB at BER (10(-4)) in comparison to other conventional methods.
The achievement of an optimal trade-off between reliability and rate has always been one of the most challenging issues in underwater acoustic links. In this context, the implementation of suitable transmission techni...
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ISBN:
(纸本)9781538616543
The achievement of an optimal trade-off between reliability and rate has always been one of the most challenging issues in underwater acoustic links. In this context, the implementation of suitable transmission techniques on Multiple-Input Multiple-Output (MIMO) architectures results to be an efficient solution to improve the communication performance. Following this direction, we investigate a space-time block coding scheme for MIMO-PPM (Pulse Position Modulation) systems that is able to provide a satisfactory compromise between rate and reliability.
The aim of this paper is twofold. In a first part, we present a new tensor decomposition that we call Tucker train decomposition or nested Tucker decomposition (NTD). NTD can be viewed as a particular case of tensor-t...
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The aim of this paper is twofold. In a first part, we present a new tensor decomposition that we call Tucker train decomposition or nested Tucker decomposition (NTD). NTD can be viewed as a particular case of tensor-train decomposition recently proposed for representing and approximating high-dimensional tensors in a compact way. NTD of a fourth-order tensor is more specially analysed in terms of parameter estimation and uniqueness issue. In a second part, We show that the use of a tensor space-time coding (TSTC) structure at both the source node and the relay node of a one-way two-hop multi input multi-output (MIMO) relay communication system leads to a nested Tucker decomposition of the fourth-order tensor formed by the signals received at the destination. Two semi-blind receivers are then proposed for jointly estimating the transmitted information symbols and the two individual relay channels. The first one is iterative, based on a three-step alternating least squares (ALS) algorithm, whereas the second one;denoted 2LSKP, is a closed-form solution based on the LS estimations of two Kronecker products. Two supervised receivers are also derived by using a (short) pilot-assisted closed form solution for calculating channel estimates. These estimates are exploited either for initializing the ALS receiver or for designing a zero-forcing (ZF) receiver. Extensive Monte Carlo simulation results are provided to demonstrate the performance of the proposed relay system. (C) 2016 Elsevier B.V. All rights reserved.
With the rapid development of high speed railway(HSR), people intensively have the demand of wireless communication with high-quality while traveling by very high speed trains. However, the current communication syste...
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ISBN:
(纸本)9781510872752
With the rapid development of high speed railway(HSR), people intensively have the demand of wireless communication with high-quality while traveling by very high speed trains. However, the current communication system for high speed railway is mainly designed under the assumption that the train velocity is a constant, while in fact the train is moving with a time varying velocity. Under these circumstances, there is some deviation between the current system design and its real working status. Therefore, we focus on the robustness in this work and investigate how the performance of the HSR communication system is affected if the train moving velocity is changing where a 2×2 antenna system and the Alamouti space-time coding are employed.
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