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Linear space-time precoding for OFDM Systems Based on Long-Term Channel State Information

INTERNATIONAL JOURNAL OF WIRELESS INFORMATION NETWORKS 2005年第4期12卷 225-233页

作者： Kusume, Katsutoshi Europe GmbH DoCoMo Commun Labs Landsberger Str 312 D-80687 Munich Germany

This work addresses the severe performance degradation for OFDM systems when long channel delays exceed the guard interval. Such long delays can be seen as an interference source on the one hand and also as a valuable frequency diversity source on the other hand. Instead of simply suppressing such long delays, e.g. by beamforming at the transmitter, we propose a new precoding scheme, which attempts to find an optimum trade-off between the interference suppression and the diversity gain. An optimization problem is formulated by exploiting only long-term channel state information instead of instantaneous one. Then, it is solved based on the minimum mean square error criterion with a constraint on the transmit power. Computer simulation results show that the proposed scheme outperforms the conventional beamforming scheme.

关键词： OFDM ISI ICI space-time precoding long-term channel state information

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space-time Physical-Layer Network Coding

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IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS 2015年第2期33卷 323-336页

作者： Lee, Namyoon Heath, Robert W., Jr. Univ Texas Austin Dept Elect & Comp Engn Wireless Networking & Commun Grp Austin TX 78712 USA

A space-time physical-layer network coding (ST-PNC) method is presented for information exchange among multiple users over fully connected multiway relay networks. The method involves two steps: 1) side-information learning and 2) space-time relay transmission. In the first step, different sets of users are scheduled to send signals over networks, and the remaining users and relays overhear the transmitted signals, thereby learning the interference patterns. In the second step, multiple relays cooperatively send out linear combinations of signals received in the previous phase using space-time precoding so that all users efficiently exploit their side information in the form of 1) what they sent and 2) what they overheard in decoding. This coding concept is illustrated through two simple network examples. It is shown that ST-PNC improves the sum of degrees of freedom (sum-DoF) of the network compared to existing interference management methods. With ST-PNC, the sum-DoF of a general multiway relay network without channel knowledge at the users is characterized in terms of relevant system parameters, chiefly the number of users, the number of relays, and the number of antennas at relays. A major implication of the derived results is that efficiently harnessing both transmitted and overheard signals as side information brings significant performance improvements to fully connected multiway relay networks.

关键词： Physical-layer network coding space-time precoding multi-way relay channels

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Achieving Full Diversity over the MIMO Fading Channel with space-time Precoders and Iterative Linear Receivers

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IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS 2011年第8期10卷 2407-2411页

作者： Kraidy, Ghassan M. Rossi, Pierluigi Salvo Norwegian Univ Sci & Technol Dept Elect & Telecommun N-7034 Trondheim Norway Univ Naples 2 Dept Informat Engn Aversa CE Italy

We study the performance of space-time bit-interleaved coded modulation (ST-BICM) over quasi-static multiple-antenna fading channels with linear receivers. We show that, under iterative linear detection and decoding, an ST-BICM can achieve full diversity with a special class of space-time precoders. We then study the outage probability at the output of the linear detector that determines the theoretical performance of coded modulations with such receivers. Finally, symbol and word error rate performances under Monte Carlo simulations are shown.

关键词： Diversity techniques iterative decoding MMSE receivers space-time precoding

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