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Energies 2019, 12(4), 599; https://doi.org/10.3390/en12040599

Low Power Consumption Signal Detector Based on Adaptive DFSD in MIMO-OFDM Systems

uT Communication Research Institute, Sejong University, Gunja-dong 98, Gwangjin-gu, Seoul 05006, Korea
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Received: 17 December 2018 / Revised: 31 January 2019 / Accepted: 11 February 2019 / Published: 14 February 2019
(This article belongs to the Section Electrical Power and Energy System)
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Abstract

For a low complexity signal detector to reduce the power consumption for multiple input and multiple output orthogonal frequency division multiplexing (MIMO-OFDM) systems, the depth-first sphere decoding (DFSD) detection scheme was proposed. However, the DFSD detection scheme still has high complexity in the hardware implementation. The complexity is especially high when the signal-to-noise ratio (SNR) is low. Therefore, this paper proposes an adaptive DFSD detection scheme. The proposed detection scheme arrays nodes, sorting by ascending order of squared Euclidean distance (ED) at the top layer of tree structure. Then, the proposed detection scheme uses the different number of nodes according to thresholds based on channel condition. In the simulation results, the proposed detection scheme has similar error performance and low complexity compared with the conventional DFSD detection scheme. Therefore, the proposed detection scheme reduces the power consumption in the signal detector. View Full-Text
Keywords: MIMO; OFDM; thresholds; adaptive DFSD MIMO; OFDM; thresholds; adaptive DFSD
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Shim, S.-J.; Choi, S.-J.; Song, H.-K. Low Power Consumption Signal Detector Based on Adaptive DFSD in MIMO-OFDM Systems. Energies 2019, 12, 599.

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