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检索条件"主题词=Space-Time Block Coding"

共 247 条记录，以下是151-160 订阅

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Channel Modeling and Signal Transmission for Land Mobile Satellite MIMO

Channel Modeling and Signal Transmission for Land Mobile Sat...

引用

IEEE Global Communications Conference (GLOBECOM)

作者： Peng, Hongwei Qi, Chenhao Chen, Yang Zhang, Qian Chen, Dong Ding, Rui Southeast Univ Sch Informat & Sci & Engn Nanjing Peoples R China China Acad Space Technol Inst Telecommun Satellite Beijing Peoples R China

ISBN: (纸本)9781728181042

In this paper, a land mobile satellite (LMS) multiple-input multiple-output (MIMO) is considered, where two satellites simultaneously communicate with a mobile user terminal (UT). Spatial degree of freedom brought by the two satellites is introduced in the channel modeling, aside of other channel parameters including time correlation, shadowing, multipath fading and Doppler effect. Then an algorithm table using Markov multiple-state transition is provided to generate the LMS MIMO channels. Based on the modeled LMS MIMO channels, signal transmission between two satellites and the UT using space-time block coding is considered. Simulation results show that compared to the single satellite communications, the dual-satellite MIMO communications can achieve better bit error rate performance under the same signal-to-noiseratio condition. In particular, the performance of dual-satellite single-polarization communications is slightly worse than that of single-satellite dual-polarization communications, since the spatial correlation is stronger than the polarization correlation.

关键词： Channel modeling land mobile satellite (LMS) multiple-input multiple-output (MIMO) signal transmission space-time block coding

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Novel Unified Expressions for Error Rates and Ergodic Channel Capacity Analysis over Generalized Fading Subject to AWGGN

Novel Unified Expressions for Error Rates and Ergodic Channe...

引用

IEEE Global Communications Conference (GLOBECOM)

作者： Salahat, Ehab Hakam, Ali Khalifa Univ Sci Technol & Res Abu Dhabi U Arab Emirates United Arab Emirates Univ Al Ain U Arab Emirates

ISBN: (纸本)9781479935123

Many generalized fading distributions are given in terms of special functions, complicating the analysis of wireless performance metrics. This paper presents novel approximations to the extended incomplete gamma function, the modified Bessel function of the second type, and the generalized Q-function. New simpler and unified form for the probability density function of the extended generalized-K (EGK) and M-N distributions is developed, avoiding complicated and computationally-expensive functions, e. g. Fox and Meijer-G. Based on the new unified PDF and the proposed approximations, we derive novel generic and unified expressions for the average bit error rate and average channel capacity for the recently introduced six most generalized fading channels, namely the EGK, the M-N, the alpha-eta-mu, alpha-lambda-mu, alpha-kappa-mu, and alpha-lambda-eta-mu, including the generalized-K, generalized Nakagami-m, the alpha-mu, the eta-mu, the lambda-mu, the kappa-mu, the Nakagami-Lognormal, the Weibull, the Rice, the Hoyt, the Maxwell and other fading scenarios as special cases. The Additive White Generalized Gaussian Noise (AWGGN) is considered as the noise model, that includes the AWGN, the Laplacian, the Gamma and the impulsive noise as special cases, being an application to the generalized Q-function approximation. Moreover, novel analysis for space-time block Codes in generalized-K fading is also developed as an application to the developed approximation of the modified Bessel function. The derived expressions are very simple and analytically traceable. Monte Carlo simulation and published work corroborate our obtained results.

关键词： Extended Incomplete Gamma Function Additive White Generalized Gaussian Noise Generalized Q-Function Modified Bessel Function M-N-Distribution alpha-lambda-eta-mu a-kappa-mu Extended Generalized-K space-time block coding

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Multiuser detection in DS-CDMA systems using POCS algorithm

Multiuser detection in DS-CDMA systems using POCS algorithm

引用

21st Telecommunications Forum (TELFOR)

作者： Voicu, C. Lohan, E. S. Halunga, S. Univ Politehn Bucuresti Telecommun Dept Elect Telecommun & Informat Technol Fac Bul Iuliu Maniu 1-3 Bucharest 061071 Romania Tampere Univ Technol Dept Elect & Commun Engn Tampere 33101 Finland

ISBN: (纸本)9781479914203

This paper presents the results obtained by a new multiuser detector based on the Projection Onto Convex Sets (POCS) deconvolution algorithm, in comparison with those obtained by the decorrelating detector, when the channel is affected by the flat Rayleigh fading and gray images are transmitted through the system. All the users transmit their information with the same power, but the spreading codes are correlated. We will investigate the fading effect on the received images and the impact of the crosscorrelation of the spreading codes on the quality of the received images. In the end, several conclusions are highlighted, with respect to the level of performance achieved.

关键词： Decorrelating detector POCS algorithm image transmission space-time block coding universal image quality index visual information fidelity index

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Power optimization of Decode-and-Forward assisted ARQ relaying 27

Power optimization of Decode-and-Forward assisted ARQ relayi...

引用

27th International Conference on Microelectronics (ICM)

作者： Kamouch, Ali Chaoub, Abdelaali Guennoun, Zouhair Mohammed V Agdal Univ Mohammadia Sch Engineers Lab Elect & Commun Rabat Morocco Natl Inst Posts & Telecommun Dept Telecommun Rabat Morocco

ISBN: (纸本)9781467387590

In this paper we investigate the performances of Decode-and-forward (DF) assisted by automatic repeat request (ARQ) relaying over Rayleigh fast fading channel. We derive a tight asymptotic approximation of the outage probability at high signal-to-noise ratio(SNR) regime. Furthermore we formulate an optimization problem aiming at achieving a target outage probability with an optimum allocation of the power budget depending on the relative position of the relay with regard to source and destination.

关键词： Decode and forward Automatic retransmission request maximum ratio combining Outage probability Power allocation space-time block coding

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Multi-rate STBC Transmission Based on a New Fuzzy Method over Dynamic Fading Channels

Multi-rate STBC Transmission Based on a New Fuzzy Method ove...

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2nd International Conference on Computer and Electrical Engineering

作者： Moridveisi, H. Panahi, Fereidoun H. Farhadi, P. Mehrnoush, M. Farzad, H. Panahi Islamic Azad Univ Dept Elect & IT Engn Sanandaj Iran Kurdistan Univ Sanandaj Iran Iran Univ Sci & Technol Dept Elect Engn Tehran Iran

ISBN: (纸本)9780769539256

This paper proposes a new fuzzy-based multi-rate STBC transmission method over dynamic fading channels in order to have an optimal channel usage and to control performance according to the instantaneous channel situations. The proposed method employs a fuzzy inference system (HS) over estimated average delay and minimum value of cost function designed for Alamouti code in each block decision. We consider several membership functions (MBFs) and rules to cover all possible values of the parameters. Monte Carlo simulation is used to evaluate the system performance in mobile radio channel environments according to the COST207* channel model.

关键词： fuzzy inference system minimum value of cost function estimated average delay space-time block coding membership function

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A Comparative Study of Alamouti and Golden space-time block Codes 13

A Comparative Study of Alamouti and Golden Space-Time Block ...

引用

13th International Conference on Communications (COMM)

作者： Toma, Eduard Valentin Toma, Anca Mihaela Ruxandra Univ Politehn Bucuresti Transportat Fac Bucharest Romania

ISBN: (纸本)9781728156118

In this conference paper, we study the BER and FER performance of the best-known space-time block codes: the Alamouti scheme and the Golden code. By way of computer simulations using a channel simulator based on the geometrical one-ring scattering model, we show that, for equal quantity of information transmitted per channel use, the performance of the Alamouti code is clearly superior to that of the Golden code for a distance between collocated antennas that is equal to and smaller than the wavelength of the carrier. The performances become comparable for an antenna separation equal to and larger than the double of the carrier wavelength. This important result was not known from the open literature.

关键词： Alamouti's scheme Golden code space-time block coding wireless communications

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space-time block coded-transmit/receive diversity 62

Space-time block coded-transmit/receive diversity

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62nd IEEE Vehicular Technology Conference

作者： Tomeba, H Takeda, K Adachi, F Tohoku Univ Grad Sch Engn Dept Elect & Commun Engn Aoba Ku Sendai Miyagi 9808579 Japan

ISBN: (纸本)0780391527

Antenna diversity is an effective technique for improving the transmission performance in a multi-path fading channel. Recently, transmit diversity has been attracting much attention since it can alleviate the complexity problem of the mobile terminal. However, by distributing antennas between the transmitter and receiver, similar performance improvement can be achieved to the case of implementing all antennas only at the transmitter or receiver side. In this paper, we propose a space-time block coded-transmit/receive diversity (STBC-TRD), which requires the channel state information (CSI) only at the transmitter side. Unlike STTD, STBC-TRD can use arbitrary number of transmit antennas, while the number of receive antennas is limited to 4. STBC-TRD achieves a larger diversity gain than joint STTD and receive antenna diversity. The performance improvement of STBC-TRD is confirmed by computer simulation.

关键词： component Antenna diversity space-time block coding time-division duplex

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space-time block Coded Spatial Modulation Aided mmWave MIMO with Hybrid Precoding 26

Space-Time Block Coded Spatial Modulation Aided mmWave MIMO ...

引用

26th IEEE Signal Processing and Communications Applications Conference (SIU)

作者： Elganimi, Taissir Y. Elghariani, Ali A. Univ Tripoli Elect & Elect Engn Dept Tripoli Libya

ISBN: (纸本)9781538615010

In this paper, a combination of space-time block Coded Spatial Modulation with Hybrid Analog-Digital Beamforming (STBC-SM-HBF) for 60 GHz Millimeter-wave (mmWave) communications is proposed in order to take advantage of the merits of Spatial Modulation (SM), space-time block Codes (STBC), Analog Beamforming (ABF), and digital precoding techniques while avoiding their drawbacks. This proposed system benefits from the multiplexing gain of SM, from the transmit diversity gain of STBC and from the Signal-to-Noise Ratio (SNR) gain of the beamformer. The simulation results demonstrate that the Zero Forcing (ZF) and the Minimum Mean Square Error (MMSE) precoded STBC-SM systems have better Bit Error Rate (BER) performance than the precoded SM system, and the former showed a performance degradation compared to STBC-SM system tough. Furthermore, the error performance is significantly improved by employing an array of ABF which improves the system performance as the number of antenna array elements increases due to providing a beamforming gain, which is hence of great significance to the Fifth Generation (5G) mmWave communications. In addition, it is demonstrated that a minimum of 2 antenna elements in the proposed scheme of STBC-SM-HBF are required to obtain better error performance than that of the conventional SM and STBC-SM systems under the same spectral efficiency of 2 bits/s/Hz.

关键词： Millimeter-wave Spatial Modulation space-time block coding Analog Beamforming Linear Precoding

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Performance Analysis of an STBC-MIMO LoRa System over Nakagami and Ricean Fading Channels with Imperfect Channel State Information 95

Performance Analysis of an STBC-MIMO LoRa System over Nakaga...

引用

IEEE 95th Vehicular Technology Conference: (VTC-Spring)

作者： Ma, Huan Cai, Guofa Fang, Yi Wu, Huihui Mumtaz, Shahid Guangdong Univ Technol Sch Informat Engn Guangzhou Peoples R China Huawei Technol Co Ltd Hong Kong Res Ctr Hong Kong Peoples R China Inst Telecommun Aveiro Portugal

ISBN: (数字)9781665482431

ISBN: (纸本)9781665482431

In this paper, we investigate the performance of space-time block-coded multiple-input-multiple-output (STBC-MIMO) LoRa system over Nakagami-m and Ricean fading channels with perfect and imperfect channel state information (CSI). Specifically, we derive the closed-form bit-error-rate expressions and analyze the diversity order of the STBC-MIMO LoRa system with perfect and imperfect CSI, where two common channel estimation error models are considered. Moreover, we perform simulations to evaluate the coverage performance of the system and to verify the accuracy of the theoretical analyses.

关键词： LoRa bit error rate diversity order Nakagami fading Ricean fading coverage performance space-time block coding multiple-input-multiple-output

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Comparative analysis of equalization techniques for STBC with application to EDGE

Comparative analysis of equalization techniques for STBC wit...

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59th IEEE Vehicular Technology Conference

作者： Mheidat, H Uysal, M Al-Dhahir, N Univ Waterloo Dept Elect & Comp Engn Waterloo ON N2L 3G1 Canada

ISBN: (纸本)0780382552

In this paper, we describe and compare three practical equalization schemes for space-time block coded transmissions with and without outer channel coding. The three schemes extend the original symbol-level schemes developed for flat-fading channels to a block-level implementation either in the time or frequency domain. The considered schemes are applied to the EDGE-TDMA system and their performances are compared under both perfect and estimated channel conditions. Various practical aspects of implementation are also addressed.

关键词： OFDM equalization space-time block coding frequency-selective channel

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