Academic literature on the topic 'Time-Frequency fading'

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Journal articles on the topic "Time-Frequency fading"

1

Zhiqiang Liu, Yan Xin, and G. B. Giannakis. "Space-time-frequency coded OFDM over frequency-selective fading channels." IEEE Transactions on Signal Processing 50, no. 10 (2002): 2465–76. http://dx.doi.org/10.1109/tsp.2002.803332.

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2

Hongbin Li. "Differential space-time-frequency modulation over frequency-selective fading channels." IEEE Communications Letters 7, no. 8 (2003): 349–51. http://dx.doi.org/10.1109/lcomm.2003.814711.

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3

ISHII, K. "Space-Time-Frequency Turbo Code over Time-Varying and Frequency-Selective Fading Channel." IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences E88-A, no. 10 (2005): 2885–95. http://dx.doi.org/10.1093/ietfec/e88-a.10.2885.

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4

Chu, James. "Frequency-Selective and Time-Selective Fading [Book\/Software Reviews]." IEEE Microwave Magazine 19, no. 5 (2018): 87–103. http://dx.doi.org/10.1109/mmm.2018.2821089.

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5

TAO, X., C. ZHANG, J. LU, and N. SUEHIRO. "Adaptive CI-OSDM in Time-Frequency Selective Fading Channel." IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences E91-A, no. 12 (2008): 3712–22. http://dx.doi.org/10.1093/ietfec/e91-a.12.3712.

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6

Borah, D. K., and B. D. Hart. "Receiver structures for time-varying frequency-selective fading channels." IEEE Journal on Selected Areas in Communications 17, no. 11 (1999): 1863–75. http://dx.doi.org/10.1109/49.806817.

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7

Al-nahari, A. Y., F. E. Abd El-Samie, and M. I. Dessouky. "Distributed Space-Time/Frequency Coding Schemes for Single-Carrier Frequency Division Multiple Access Systems." ISRN Communications and Networking 2011 (April 4, 2011): 1–10. http://dx.doi.org/10.5402/2011/549706.

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The single carrier-frequency division multiple access (SC-FDMA) system is a new system that was adopted in the standardization of the upcoming 3GPP long-term evolution (LTE). Designing diversity-achieving schemes for the SC-FDMA system is a challenging task. The codes adopted should not affect the peak-to-average power ratio (PAPR) among other constraints. In this paper, we consider the design of cooperative diversity schemes for SC-FDMA systems in the uplink direction. Specifically, two relay-assisted distributed space-time/frequency codes are proposed. The proposed distributed space-frequency code (SFC) achieves full spatial diversity in the uplink fast-fading channels, where a diversity of order three can be achieved. The proposed code keeps a low PAPR, which is a good feature of the system. A minimum mean square error (MMSE) decoder is used at the receiver of the destination node. Moreover, we propose a bandwidth-efficient distributed space-time code (STC) for slow-fading relay channels. A decode-and-forward (DF) protocol is used at the relay node, and the possibility of erroneous decoding is taken into account. Simulation results demonstrate the performance improvement of the proposed schemes.
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8

Sun, Zeng You, and Xia Ling. "Time-Varying Channel Multi-Carrier Modulation Technology Research." Applied Mechanics and Materials 513-517 (February 2014): 2680–86. http://dx.doi.org/10.4028/www.scientific.net/amm.513-517.2680.

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With frequency selective fading from multi-path characteristic and time selective fading from high speed mobility, double selective channel has become the typical context for the current wireless communication system. To realize high performance transmission in time-varying channel, this paper presents DAFT-OFDM multicarrier modulation scheme. The simulation results show that the scheme is applicable to time-varying fading channel, in which each path experiences independent Doppler spread. The scheme can also reduce ICI effectively.
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9

Fokin, G. "Modeling multi-beam radio channel." Telecom IT 9, no. 1 (2021): 59–78. http://dx.doi.org/10.31854/2307-1303-2021-9-1-59-78.

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In this work, a simulation model of a radio channel with fading is implemented for use 
 in research of the multipath channel, as well as for assessing the noise immunity of transmission, recep-tion and processing systems in modern and future mobile communication and radio access networks. Formalization of mathematical models of a radio channel with fading, including the Rayleigh amplitude distribution, uniform phase distribution and a given Doppler spectrum, made it possible to visualize 
 the time-frequency and probabilistic characteristics of a radio channel with fading. The implementation 
 of the procedures for delaying and attenuating copies of signals in a multipath radio channel made it pos-sible to reproduce scenarios of flat and frequency selective fading, which are widely used in practice in assessing the noise immunity of signals with given frequency and time characteristics.
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10

Kim, Minhyuk, and Sekchin Chang. "A real-time locating system for localization of high-speed mobile objects." International Journal of Distributed Sensor Networks 14, no. 5 (2018): 155014771877447. http://dx.doi.org/10.1177/1550147718774475.

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This article addresses a novel real-time locating system for localization of high-speed mobile objects in fading environments. The proposed locating system exploits time difference of arrival measurements based on ultra-wideband signals. However, the ultra-wideband signals cause a frequency-selective fading due to their short time duration, which induces severe inter-symbol interference. Moreover, high-speed objects cause fast fading due to large Doppler spread. Therefore, the fading cases considerably reduce the localization performance. The presented locating system relies on a new localization approach in order to overcome the fading issues, which utilizes a modification of extended Kalman filtering. Especially, the suggested locating method works well even in the zero time difference of arrival case, which occurs due to a very deep fading. Experiment results verify that the proposed real-time locating system gives excellent localization performance in severe fading environments. The results also exhibit that the presented locating system is superior to the conventional locating systems in the localization of high-speed mobile objects under fading environments.
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