Low Complexity Codebook-Based Beamforming for MIMO-OFDM Systems in Millimeter-Wave WPAN

Lee, Hyun-Ho; Ko, Young-Chai

doi:10.1109/twc.2011.091911.102114

Cited by 46 publications

(32 citation statements)

References 9 publications

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“…However, we would like to elucidate the potential of 60 GHz DAS, so full channel knowledge is assumed for the analysis to get more general results. For a practical beamforming approach, one can refer to other studies like [17,19], which use limited channel information feedback or codebook based beamforming.…”

Section: Selective Transmissionmentioning

confidence: 99%

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Distributed Antenna System for Mitigating Shadowing Effect in 60 GHz WLAN

Wang

Debbarma

et al. 2014

Wireless Pers Commun

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The 60 GHz unlicensed frequency band has been adopted to support high data rate WLAN applications. The problem of this frequency band is that the wireless signal is vulnerable to the shadowing of objects. Especially in indoor scenarios, humans may frequently block the signal paths that cause disconnections of devices. This problem can be mitigated by using multiple antennas that can create rich signal paths between the devices. The idea presented in this paper is to employ a distributed antenna system (DAS) architecture enabled by radio-over-fiber technology to alleviate the shadowing problem. In the DAS architecture, multiple remote antenna units (RAUs), each of them equipped with an antenna array, are connected with the same WLAN access points via optical fibers. But there are questions that need to be answered, including the beamforming strategy with multiple RAUs, and the placement and the required number of the RAUs. These questions are related to factors like room size, population density, etc. We discuss these questions in this paper and present our findings through theoretical models and extensive simulations, which can be referred to for practical implementations. We find that the proposed 60 GHz DAS can significantly improve the link connectivity. Even when only two RAUs are used, the signal coverage can be improved to an acceptable percentage in heavy shadowing scenarios.

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Section: Selective Transmissionmentioning

confidence: 99%

“…We employ in this paper the exponential effective SNR mapping (EESM) scheme which is widely adopted, like in [16,17], to characterize the OFDM signal quality. The relation between the effective SNR and the SNR of the subcarriers is expressed as [18] …”

mentioning

confidence: 99%

Distributed Antenna System for Mitigating Shadowing Effect in 60 GHz WLAN

Wang

Debbarma

et al. 2014

Wireless Pers Commun

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“…To compensate the significant path loss, the directional antenna is used to generate narrow directional beams, which provides significant gain [4], [5].…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, the beam-forming technology can be used to improve the link quality as well as angle information distribution. All these factors motivate the researchers to focus on mmW communication [4], [5]. Analog beam-forming is much less hardware complexity and power consumption constraint so that it preferred in 60GHz indoor mmWave communication [2], [5].…”

Section: Introductionmentioning

confidence: 99%

“…All these factors motivate the researchers to focus on mmW communication [4], [5]. Analog beam-forming is much less hardware complexity and power consumption constraint so that it preferred in 60GHz indoor mmWave communication [2], [5]. The main purpose of the array antenna is to improve the SNR by adding correlated signals and uncorrelated noise.…”

Section: Introductionmentioning

confidence: 99%

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Codebook metrics evaluation for millimeter wave communications by antenna array response and signal to noise ratio

et al. 2018

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Abstract. Codebook design is a key point in beam-forming which is necessary for millimeter Wave (mmWave) communications to compensate its huge path loss. In our study, we demonstrate the benefits of the number of antenna elements for beamforming; we focus on the number of required beams to cover the whole circle with considering the available number of antenna elements. In addition to, we propose a new codebook structure based on unique phase states. Based on the Array Factor (AF) and Signalto-Noise Ratio (SNR), the proposed codebook is compared and evaluated with the uniform weighting codebook, circular array codebook, and IEEE802.15.3c standard codebook. The results show that the proposed codebook achieves SNR values and side-lobes cancel a bit better than IEEE802.15.3c, but higher peak and wider dynamic range of SNR and better array directivity compared with the uniform weighting and circular antenna codebooks. Thus, the proposed codebook is expected to improve signal quality and increases user throughput significantly.

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CSMA/CA‐based medium access control for indoor millimeter wave networks

Qiao

Shen

Mark

et al. 2014

Wireless Communications

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Millimeter wave (mmWave) communication is a promising technology to support high-rate (e.g., multi-Gbps) multimedia applications because of its large available bandwidth. Multipacket reception is one of the important capabilities of mmWave networks to capture a few packets simultaneously. This capability has the potential to improve medium access control layer performance. Because of the severe propagation loss in mmWave band, traditional backoff mechanisms in carrier sensing multiple access/collision avoidance (CSMA/CA) designed for narrowband systems can result not only in unfairness but also in significant throughput reduction. This paper proposes a novel backoff mechanism in CSMA/CA by giving a higher transmission probability to the node with a transmission failure than that with a transmission success, aiming to improve the system throughput. The transmission probability is adjusted by changing the contention window size according to the congestion status of each node and the whole network. The analysis demonstrates the effectiveness of the proposed backoff mechanism on reducing transmission collisions and increasing network throughput. Extensive simulations show that the proposed backoff mechanism can efficiently utilize network resources and significantly improve the network performance on system throughput and fairness.

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Low Complexity Codebook-Based Beamforming for MIMO-OFDM Systems in Millimeter-Wave WPAN

Cited by 46 publications

References 9 publications

Distributed Antenna System for Mitigating Shadowing Effect in 60 GHz WLAN

Distributed Antenna System for Mitigating Shadowing Effect in 60 GHz WLAN

Codebook metrics evaluation for millimeter wave communications by antenna array response and signal to noise ratio

CSMA/CA‐based medium access control for indoor millimeter wave networks

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