Results 11 - 20 of 13,990

AN EFFICIENT FAST-FADING CHANNEL ESTIMATION AND EQUALIZATION METHOD WITH SELF ICI CANCELLATION

by Yen-hui Yeh, Sau-gee Chen
"... OFDM systems are vulnerable to time-selective fading ef-fect, due to the relatively long symbol duration, compared with single-carrier systems. This results in non-negligible inter-carrier interference (ICI). This paper proposes an effec-tive frequency-domain pilot-symbol-aided channel estima-tion m ..."
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method for fast-fading channels. By first observing high correlation between ICIs of adjacent subcarriers, we then devise an inter-carrier cancellation scheme. From the ICI-reduced signal, we are able to achieve good channel estima-tion and equalization accuracy. Simulations show that the new method can

Performance of single carrier transmission with cooperative diversity over fast fading channels

by Dae-young Seol, Ui-kun Kwon, Gi-hong Im, Senior Member - IEEE Trans. Commun , 2009
"... Abstract—Space-time block coded (STBC) single carrier (SC) transmission was extended in a distributed fashion for practical implementation of user cooperation. However, STBC was de-signed under the assumption that the channel is static over the duration of a space-time codeword. Thus, the distribute ..."
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, the distributed STBC SC system suffers from the time selectivity of wireless fading channels. To achieve a reliable performance over fast fading channels, we propose a distributed space-frequency block coded (D-SFBC) SC transmission. This paper analytically compares the performance of these two distributed SC

Upper bound on the error probability for space-time codes in fast fading channels

by Hyundong Shin, Jae Hong Lee - Vehicular Technology Conference VTC , 2002
"... Abstract−We present exact union bounds on the error probability of space-time codes in fast Rayleigh and Rician fading channels. Using Craig’s formula for the Gaussian Q-function, an exact pairwise error probability (PEP) of space-time codes is expressed in the form of a single finite-range integral ..."
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Abstract−We present exact union bounds on the error probability of space-time codes in fast Rayleigh and Rician fading channels. Using Craig’s formula for the Gaussian Q-function, an exact pairwise error probability (PEP) of space-time codes is expressed in the form of a single finite

Blind Collision Resolution for Mobile Radio Networks in Fast-Fading Channels

by unknown authors
"... Abstract — Network-assisted diversity multiple access (NDMA) is a novel algorithm that resolves packet collisions deterministically by means of source separation techniques. The blind version of NDMA (B-NDMA) relies on the presence of a fading process that induces constant channel parameters over lo ..."
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long slot times, as well as, the transmitter-receiver phase synchronization. In this paper, independent component analysis (ICA) is integrated into NDMA to provide blind collision resolution with high throughput/delay performance in a fast-fading channel environment and without phase control. Index

Blind Collision Resolution for Mobile Radio Networks in Fast-Fading Channels

by unknown authors
"... Abstract — Network-assisted diversity multiple access (NDMA) is a novel algorithm that resolves packet collisions deterministically by means of source separation techniques. The blind version of NDMA (B-NDMA) relies on the presence of a fading process that induces constant channel parameters over lo ..."
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long slot times, as well as, the transmitter-receiver phase synchronization. In this paper, independent component analysis (ICA) is integrated into NDMA to provide blind collision resolution with high throughput/delay performance in a fast-fading channel environment and without phase control. Index

Space-Time Trellis Code Construction for Fast Fading Channels

by Zoltan Safar, K. J. Ray Liu - Proceedings of ICC , 2002
"... Abstract—The need for bandwidth- and power-efficient wireless communication systems has raised considerable interest in space-time codes. In this work, we propose a systematic space-time code construction procedure for fast fading channels. The method can be used to design space-time codes for an ar ..."
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Abstract—The need for bandwidth- and power-efficient wireless communication systems has raised considerable interest in space-time codes. In this work, we propose a systematic space-time code construction procedure for fast fading channels. The method can be used to design space-time codes

Turbo-NFSK: Iterative estimation, noncoherent demodulation, and decoding for fast fading channels

by Shi Cheng, Matthew C. Valenti Don Torrieri - Department of Computer Science and Electrical Engineering, West Virginia University, Morgantown. He , 2005
"... This paper ∗ considers the problem of communicating over fast fading channels, where the channel coherence time is only on the order of a few symbols. Since the fading is too fast for coherent reception, we employ M-ary frequency shift keying with soft noncoherent demodulation. Information is encode ..."
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This paper ∗ considers the problem of communicating over fast fading channels, where the channel coherence time is only on the order of a few symbols. Since the fading is too fast for coherent reception, we employ M-ary frequency shift keying with soft noncoherent demodulation. Information

Dpsk Vs. Pilot-Aided Psk Map Equalization For Fast-Fading Channels

by Linda Davis, Iain Collings , 1999
"... In this paper, we extend our recent work in maximum a posteriori (MAP) equalization for frequencyselective fast-fading channels to the case of differentially encoded transmitted symbols. The equalizer employs an expanded trellis for the purpose of joint channel estimation and equalization. Channel e ..."
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In this paper, we extend our recent work in maximum a posteriori (MAP) equalization for frequencyselective fast-fading channels to the case of differentially encoded transmitted symbols. The equalizer employs an expanded trellis for the purpose of joint channel estimation and equalization. Channel

InFRA: In-Frame Rate Adaptation in Fast Fading Channel Environments

by Hyunjoong Lee, Hyung-sin Kim, Saewoong Bahk
"... Abstract—In wireless networks, frame retransmission is used to increase reliability with the use of additional wireless resources. Recently, various approaches have been proposed to reduce the overhead for retransmission. However, they still suffer from performance degradation due to unpredictable w ..."
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wireless channel variation during a frame transmission in fast-fading environ-ments. In this paper, we propose an in-frame rate adaptation (InFRA) scheme as a solution for mitigating the retransmission overhead. In InFRA, a receiver estimates the channel SNR of incoming symbols and feeds it back

Semi-Blind Equalization for OFDM Systems over Fast Fading Channels

by Tao Cui, Chintha Tellambura
"... Abstract — We consider semi-blind data detectors for OFDM systems over fast fading channels. Three maximum-likelihood (ML) data detectors (MLD) are derived assuming exact channel correlation. The first two exploit the correlation among pre-DFT and post-DFT received signals and the third one average ..."
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Abstract — We consider semi-blind data detectors for OFDM systems over fast fading channels. Three maximum-likelihood (ML) data detectors (MLD) are derived assuming exact channel correlation. The first two exploit the correlation among pre-DFT and post-DFT received signals and the third one average
Results 11 - 20 of 13,990