Channel Estimation of MIMO Relay Systems With Multiple Relay Nodes

He, Zhiqiang; Yang, Jiaolong; Wang, Xiaodan; Liu, Yang; Rong, Yue

doi:10.1109/access.2017.2775202

Cited by 7 publications

(3 citation statements)

References 23 publications

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“…The latter has been gaining momentum, as it can enable the efficient utilization of communication resources by permitting nodes to co-operate in information exchange with other, thus enhancing the QoS. In this sense, the use of Relay Nodes (RNs) presents several advantages, such as a reduction in the total transmission power, spread in the network capacity, the elimination of penetration losses in outdoor-to-indoor scenarios, and an increase in network coverage [3,4]. Accordingly, several system architectures involving Relay Nodes have been proposed in the literature [5][6][7], in which a stage of intermediate nodes helps the transmitter to communicate with its receiver by employing a shared radio resource [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

A Comparative Experimental Study of MIMO A&F and D&F Relay Nodes Using a Software-Defined Radio Platform

Peña

Alonso

2021

Electronics

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The relaying technologies in co-operative systems are considered a core element in actual and future wireless communications, assisting the network by enhancing its reliability and improving its capability through exploiting co-operativity. In this paper, a co-operative system testbed based on Software Defined Radio (SDR) through Universal Software Radio Peripherals (USRPs) and the MATLABTM software is presented. The main novelty in this development of the platform is the implementation of 4G signal features, such as Physical Downlink Shared Channel (PDSCH) and Downlink Shared Channel (DL-SCH) for transport channel coding, which is one of the main contribution of the paper. The developed SDR Multi-Input and Multi-Output (MIMO) co-operative platform is capable of developing prototypes for the Relay Nodes (RNs). More specifically, the Amplify-&-Forward (A&F)—with or without Zero Forcing (ZF) and Mean Maximum Square Error (MMSE) Pre-Equalization—and Decode-&-Forward (D&F) protocols were implemented. Both Single-Input and Single-Output (SISO) and MIMO modes are supported by our testbed. The developed A&F and D&F MIMO co-operative systems in this paper utilize Orthogonal Space-Frequency Block Codes (OSFBCs) for the transmission of data symbols from the source to the destination. Our results show that RNs can substantially improve the Bit Error Rate (BER) and throughput in communications between the eNodeB and User Equipment (UE). In particular, the maximum throughput achieved by conventional MIMO A&F is 9.3Mbps at Signal-to-NoiseRatio(SNR)=16dB, which is 4Mbps higher than throughput of MIMO Non-Co-operative. It also shows the capacity improvement when considering the pre-equalization in the A&F schemes, compared to the conventional A&F RN. For example, with MIMO A&F-MMSE pattern, a value os 11.8 Mbps is achieved for SNR=16dB, which is 84.8% of the maximum system throughput (13.95 Mbps). On the other hand, the obtained results with D&F schemes far exceed those obtained with A&F strategies, achieving the maximum performance with the 2×2 MIMO D&F protocol from SNR=8dB.Furthermore, this work constitutes a first stage to the implementation of a 5G New-Radio Co-operative System platform.

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Section: Introductionmentioning

confidence: 99%

A Comparative Experimental Study of MIMO A&F and D&F Relay Nodes Using a Software-Defined Radio Platform

Peña

Alonso

2021

Electronics

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“…In fact, relaying technology has proven to be an optimal solution to guarantee the quality of service in certain scenarios. In this context, the use of RNs presents several advantages, such as a reduction in total transmission power, a decrease in network capacity dispersion, the elimination of penetration losses in outdoor-to-indoor scenarios, and an increase in network coverage that combined with the access link in millimeter bands can lead to a notable improvement in network operation [ 11 , 12 ]. Furthermore, RN techniques have been studied and considered for standardization by the 3GPP [ 13 ].…”

Section: Introductionmentioning

confidence: 99%

A Two-Hop mmWave MIMO NR-Relay Nodes to Enhance the Average System Throughput and BER in Outdoor-to-Indoor Environments

Peña

Alonso

2021

Sensors

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Millimeter-Wave (mmWave) bands are receiving enormous attention in 5G mobile communications, due to the capability to provide a multi-gigabit transmission rate. In this paper, a two-hop architecture for 5G communications with the capacity to support high end-to-end performance due to the use of Relay Nodes (RNs) in mmWave-bands is presented. One of the novelties of the paper is the implementation of Amplify-and-Forward (A&F) and Decode-and-Forward (D&F) RNs along with a mmWave-band transceiver chain (Tx/Rx). In addition, two approaches for channel estimation were implemented at the D&F RN for decoding the backhaul link. One of them assumes complete knowledge of the channel (PCE), and the other one performs the channel estimation through Least Square (LS) estimator. A large number of simulations, using MATLABTM and SimulinkTM software, were performed to verify the potential benefits of the proposal two-hop 5G architecture in an outdoor-to-indoor scenario. The main novelty in performing these simulations is the use of signals with 5G features, as DL-SCH transport channel coding, PDSCH generation, and SS Burst generation, which is another of the main contributions of the paper. On the other hand, mmWave transmitter and receiver chains were designed and implemented with off-the shelf components. The simulations show that the two-hop network substantially improves the Key Performance Indicators (KPIs), Bit Error Rate (BER), and Throughput, in the communications between the logical 5G Radio Node (gNodeB), and the New Radio User Equipment (NR-UE). For example, a throughput improvement of 22 Mbps is obtained when a 4 × 4 × 2 MIMO D&F with LS architecture is used versus a SISO D&F with PCE architecture for Signal-to-Noise Ratio (SNR) = 20 dB and 64-QAM signal. This improvement reaches 96 Mbps if a 256-QAM signal is considered. The improvement in BER is 11 dB and 10.5 dB, respectively, for both cases. This work also shows that the obtained results with D&F RNs are better than with A&F RNs. For example, an improvement of 17 Mbps in the use of SISO D&F with LS vs. SISO A&F, for the 64-QAM signal is obtained. Besides, this paper constitutes a first step to the implementation of a mmWave MIMO 5G cooperative network platform.

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“…Recently, relays and multi-input multi-output (MIMO) have been identified as two key technologies to improve communications over a wireless channel [1][2][3]. With multiple transmit and multiple receive antennas, MIMO systems can obtain either a diversity gain or a capacity gain compared with the single-input single-output (SISO) systems [4].…”

Section: Introductionmentioning

confidence: 99%

Two-Stage Channel Estimation Assisted by Correlation Exploitation for Amplify and Forward Relay Networks With Multiple Transmit and Receive Antennas

Lv¹,

Duan²,

Yang³

2018

PIER M

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This paper proposes a new two-stage channel estimation (TSCE) method to estimate the cascaded channels in amplify-and-forward (AF) one-way relay network (OWRN) with multiple transmit and receive antennas. Different from existing estimation methods, the proposed TSCE estimates the cascaded channel matrix by utilizing the special structure of the received signal in the destination and by exploiting the correlations among the cascaded channel matrix entries. The TSCE not only obtains the channel state information (CSI) when receiving training sequences, but also improves the accuracy of CSI when receiving the data sequences. Simulation results demonstrate that the proposed TSCE can improve estimation accuracy compared with traditional channel estimation schemes.

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Channel Estimation of MIMO Relay Systems With Multiple Relay Nodes

Cited by 7 publications

References 23 publications

A Comparative Experimental Study of MIMO A&F and D&F Relay Nodes Using a Software-Defined Radio Platform

A Comparative Experimental Study of MIMO A&F and D&F Relay Nodes Using a Software-Defined Radio Platform

A Two-Hop mmWave MIMO NR-Relay Nodes to Enhance the Average System Throughput and BER in Outdoor-to-Indoor Environments

Two-Stage Channel Estimation Assisted by Correlation Exploitation for Amplify and Forward Relay Networks With Multiple Transmit and Receive Antennas

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