Analysis of Single-RF MIMO Receiver with Beam-Switching Antenna

Gwak, Donghyuk; Sohn, Illsoo; Lee, Seung Hwan

doi:10.4218/etrij.15.0114.0618

Cited by 14 publications

(14 citation statements)

References 14 publications

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“…We consider a beamspace-domain MIMO channel model [27,32] that represents a MIMO channel matrix with channel gains between the transmitting beam patterns and receiving beam patterns. The channel matrix between the BS and user u is H u , where the element in the mth row and the nth column denotes the channel gain between the nth transmitting beam pattern at the BS and the mth receiving beam pattern at user u.…”

Section: System Modelmentioning

confidence: 99%

“…We propose a practical single-RF MIMO-OFDM system with a BSA that resolves replica interference problem. Compared to two most closely related works in [25,27], this paper includes the following differential work and novelty. In contrast to continuously rotating antennas in [25], we investigate beam switching antennas, which improves implementation feasibility with the help of rapid advances in electrical switching devices, e.g., PIN diodes.…”

Section: Introductionmentioning

confidence: 99%

“…In contrast to continuously rotating antennas in [25], we investigate beam switching antennas, which improves implementation feasibility with the help of rapid advances in electrical switching devices, e.g., PIN diodes. In [27], only single-carrier system model is considered for the simplicity of analysis while this paper extends the system model to capture multi-carrier and co-existing system scenarios. Thus, this paper provides more practical results for real-world communication environments.…”

Section: Introductionmentioning

confidence: 99%

“…The induced replicas may interfere with the desired signals, which is the major drawback of this type of antenna. A more detailed analysis of the impacts of replicas in a single-RF MIMO receiver with a BSA is presented in [27]. Several restrictions on beam pattern switching rates to avoid replica interference have been presented.…”

Section: Introductionmentioning

confidence: 99%

“…The performance of beam-steerable antennas at a single-RF MIMO receiver has been analyzed in [25]. In [26,27], a beam switching antenna (BSA) has been proposed for use in a single-RF MIMO receiver as a simplified form of beam-steerable antenna. In [28,29], BSAs are utilized at user devices and improve multi-user system throughput by exploiting pattern diversity.…”

Section: Introductionmentioning

confidence: 99%

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Single-RF MIMO-OFDM system with beam switching antenna

Sohn

Gwak

2016

J Wireless Com Network

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In this paper, we investigate the replica interference problem of a multiple input multiple output (MIMO) receiver with a beam switching antenna (BSA) within the orthogonal frequency division multiplexing (OFDM) framework. Our frequency-domain analysis has revealed the following important findings: (i) without co-existing system, replica interference in the system can be completely avoided as long as the beam pattern switching rate of the BSA receiver is an integer multiple of the product of the OFDM sampling rate and the number of receiving beam patterns and (ii) with co-existing systems, replica interference cannot always be avoided because co-existing systems may induce replicas in the operating frequency bands of the system. We present a replica interference criterion that depends on the co-existing status and users' beam switching capabilities. Based on our findings, we propose various replica interference avoidance (RINA) strategies for different co-existing and cooperating network scenarios. In addition, the overall network operation principles of the proposed RINA strategy are presented. Simulation results verify that the proposed MIMO-OFDM system with a BSA successfully provides both MIMO and OFDM benefits, thereby resolving replica interference issues.

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Section: System Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Single-RF MIMO-OFDM system with beam switching antenna

Sohn

Gwak

2016

J Wireless Com Network

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Experimental investigation of beam-steering applied to 2 × 2 MIMO system with single receiving RF chain and time-modulated antenna array

Bogdan

Godziszewski

Yashchyshyn

2020

Int. J. Microw. Wireless Technol.

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Multiple antennas and multiple radio frequency (RF) chains in both the transmitter and receiver are required in conventional radio systems employing the multiple-input multiple-output (MIMO) method. This paper presents an experimental investigation of a beam-steering time-modulated MIMO receiver with a single RF chain. Implementation of the receiver is based on a time-modulated antenna array (TMAA) and a software-defined radio. The sidebands generated inherently by the TMAA are utilized as virtual spatial channels with the beam-steering functionality. Performance of the system is investigated experimentally. The bit error rate and condition number of the channel matrix are examined for different radiation patterns in order to determine favorable configurations in a given multipath environment. Obtained results show a considerable impact of the beam-steering on the performance of MIMO transmission.

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Performance Evaluation of Uplink Multiuser MIMO-OFDM System With Single RF Chain Receiver

et al. 2022

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In response to the recent increase in wireless-traffic demand in various wireless communication networks, the number of spatial multiplexings, represented by multiple input multiple output (MIMO) systems, has been increasing. Assuming a realistic hardware configuration achieving an increase in the number of spatial multiplexings depends on increasing the amount of hardware, such as analog/digital (A/D) and D/A converters, and radio frequency (RF) chains. Simplifying the hardware configuration while maintaining large channel capacity was the challenging issue to further improve the channel capacity in Beyond-5G and 6G. This paper proposes a novel system configuration based on an uplink multiuser MIMO -orthogonal frequency division multiplexing (OFDM) system with a single RF chain receiver. By oversampling OFDM signals with a single RF chain receiver, our approach provides an additional spatial multiplexing by switching the antenna directivity pattern in synchronization with the received sampling frequency. Oversampled OFDM signals are typically used for noise reduction, in the proposed configuration, they are used for adding spatial multiplexings. We clarify the potential of the proposed configuration for improving the channel capacity by applying it to the uplink multiuser MIMO-OFDM system. To demonstrate its feasibility, we developed a testbed and analyzed its effectiveness in experiment in an actual indoor office environment.INDEX TERMS uplink, multiuser MIMO, OFDM, oversampling, RF chain, channel capacity, hardware simplification.

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Analysis of Single-RF MIMO Receiver with Beam-Switching Antenna

Cited by 14 publications

References 14 publications

Single-RF MIMO-OFDM system with beam switching antenna

Single-RF MIMO-OFDM system with beam switching antenna

Experimental investigation of beam-steering applied to 2 × 2 MIMO system with single receiving RF chain and time-modulated antenna array

Performance Evaluation of Uplink Multiuser MIMO-OFDM System With Single RF Chain Receiver

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