This paper develops low-complexity adaptive receivers for space-time block-coded (STBC) transmissions over frequency-selective fading channels. The receivers are useful for equalization purposes for single user transm...
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This paper develops low-complexity adaptive receivers for space-time block-coded (STBC) transmissions over frequency-selective fading channels. The receivers are useful for equalization purposes for single user transmissions and for joint equalization and interference cancellation for multiuser transmissions. The receivers exploit the rich code structure of STBC codes in order to deliver recursive-least-squares (RLS) performance at least-mean-squares (LMS) complexity. Besides reduced complexity, the proposed adaptive receivers also lower system overhead requirements.
This paper investigates the keyhole or pinhole effect on the pairwise error probability (PEP) performance of the multiple-input multiple-output (MIMO) space-time block-code (STBC) based selective decode and forward (S...
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This paper investigates the keyhole or pinhole effect on the pairwise error probability (PEP) performance of the multiple-input multiple-output (MIMO) space-time block-code (STBC) based selective decode and forward (S-DF) protocol. The closed form PEP expressions are derived for several configurations in terms of number of hops, phases, and relays over Nakagami-m fading channel, with perfect and imperfect channel state information (CSI), and with and without the keyhole condition. Further, a framework is developed for deriving the diversity order (DO) for each configuration. It demonstrates that full DO for cooperation protocol can be achieved when there is a knowledge of perfect CSI. A convex optimization framework is formulated for obtaining the optimal source-relay power allocation factors which significantly improve the end-to-end reliability of the system under power constraint scenarios. Monte Carlo simulations are performed for both equal and optimal power allocation factors and results show the substantial improvement in PEP performance with an increase in the value of the shape parameter and relay to destination (RD) link channel variance. Results show an improved PEP performance by increasing the RD link channel variance in comparison to increasing the source to relay (SR) link channel variance. Also PEP performance degrades for keyhole Nakagami-m fading channel as compared to Nakagami-m fading channel. Simulation results are in close agreement with the analytical results at high signal to noise ratio (SNR) regimes. (C) 2018 Elsevier B.V. All rights reserved.
Low complexity space-frequency turbo detection and decoding schemes are proposed for multi-user space-time block-coded (STBC) block transmission systems, including cyclic prefix based single-carrier block transmission...
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Low complexity space-frequency turbo detection and decoding schemes are proposed for multi-user space-time block-coded (STBC) block transmission systems, including cyclic prefix based single-carrier block transmission (CP-SCBT) system and OFDM system. Using the algebraic properties of these systems, we give the implementation of MMSE- and match-filter-based (MF) turbo detector in the frequency domain. The detector complexity is independent of the channel memory and of the constellation size. To further reduce the complexity, a switched MMSE/MF detector is applied to the turbo receivers. Simulation results show that in the mobile frequency selective channels the performance of the proposed receivers is comparable to the near optimal list sphere decoding based turbo receiver, and it is very close to that of the single-user in the Gaussian channel.
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