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Open AccessArticle

Low-Complexity QRD-M with Path Eliminations in MIMO-OFDM Systems

uT Communication Research Institute, Sejong University, Seoul 05006, Gwangjin-gu, Gunja-dong 98, Korea
Author to whom correspondence should be addressed.
Appl. Sci. 2017, 7(12), 1206;
Received: 18 September 2017 / Revised: 21 November 2017 / Accepted: 21 November 2017 / Published: 23 November 2017
(This article belongs to the Special Issue Advanced Internet of Things for Smart Infrastructure System)
The QR decomposition-M algorithm (QRD-M) is a popular signal detector which has similar error performance with maximum likelihood (ML) in multiple input multiple output-orthogonal frequency division multiplexing (MIMO-OFDM) systems. The QRD-M uses M candidates at each layer, unlike the ML. However, the complexity of the QRD-M is high in huge MIMO-OFDM systems due to unnecessary survival paths at each layer. In this paper, a low-complexity QRD-M with variable number of survival paths at each layer is proposed. In the conventional QRD-M, path eliminations at the previous layer reduce the number of calculations for accumulated squared Euclidean distance (ASED) in subsequent layers. The proposed QRD-M eliminates unnecessary survival paths by comparing the ASED and the calculated threshold at each layer. The simulation results show that the proposed QRD-M maintains the error performance for the conventional QRD-M and has a very low complexity. View Full-Text
Keywords: MIMO-OFDM; QRD-M; survival path; path elimination MIMO-OFDM; QRD-M; survival path; path elimination
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MDPI and ACS Style

Ro, J.-H.; Kim, J.-K.; You, Y.-H.; Song, H.-K. Low-Complexity QRD-M with Path Eliminations in MIMO-OFDM Systems. Appl. Sci. 2017, 7, 1206.

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