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

Ro, Jae-Hyun; Kim, Jong-Kwang; You, Young-Hwan; Song, Hyoung‐Kyu

doi:10.3390/app7121206

Cited by 4 publications

(4 citation statements)

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“…However, the complexity for QRD-M is increased exponentially as modulation order and the number of transmit antennas is large because unnecessary survival paths at each layer are also increased exponentially. In [13], thresholds are calculated at each layer to eliminate unnecessary survival paths. For path eliminations, ASED is compared with a calculated threshold at each layer and paths which are larger than a threshold are eliminated.…”

Section: Proposed Schemementioning

confidence: 99%

“…Unlike the conventional FIC, the proposed scheme completely cancels the IRI at relay nodes and the effects of error propagations are low at a destination. To remove the IRI at relay nodes, the proposed scheme uses MIMO signal detection [9][10][11][12][13][14][15][16][17][18]. The complexity for the MIMO signal detection is high at a receiver.…”

Section: Introductionmentioning

confidence: 99%

“…However, complex signal detection may be applied well when the receiver is a relay which is not usually mobile user. To optimally cancel the IRI, the relays use the low-complexity QR decomposition-M algorithm (QRD-M) in [13] which has the same error performance as maximum likelihood (ML). The conventional QRD-M is reduced complexity version of the ML.…”

Section: Introductionmentioning

confidence: 99%

“…The main reason for high complexity of the conventional QRD-M is that it calculates many unnecessary survival paths at all layers. To reduce the number of unnecessary survival paths, [13] eliminates unnecessary survival paths which have larger accumulated squared Euclidean distance (ASED) than adaptively calculated threshold at each layer.…”

Section: Introductionmentioning

confidence: 99%

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An Interference Cancellation Scheme for High Reliability Based on MIMO Systems

Park

Song

2018

Applied Sciences

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This article proposes a new interference cancellation scheme in a half-duplex based two-path relay system. In the conventional two-path relay system, inter-relay-interference (IRI) which severely degrades the error performances at a destination occurs because a source and a relay transmit signals simultaneously at a specific time. The proposed scheme removes the IRI at a relay for higher signal-to-interference plus noise ratio (SINR) to receive interference free signal at a destination, unlike the conventional relay system, which removes IRI at a destination. To handle the IRI, the proposed scheme uses multiple-input multiple-output (MIMO) signal detection at the relays and it makes low-complexity signal processing at a destination which is a usually mobile user. At the relays, the proposed scheme uses the low-complexity QR decomposition-M algorithm (QRD-M) to optimally remove the IRI. Also, for obtaining diversity gain, the proposed scheme uses cyclic delay diversity (CDD) to transmit the signals at a source and the relays. In simulation results, the error performance for the proposed scheme is better when the distance between one relay and another relay is low unlike the conventional scheme because the QRD-M detects received signal in order of higher post signal-to-noise ratio (SNR).

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Section: Proposed Schemementioning

confidence: 99%