Extending 5G TDD Coverage With XDD: Cross Division Duplex

Ji, Hyoungju; Kim, Younsun; Khurram, Muhammad; Tarver, Chance; Tonnemacher, Matthew; Kim, Taehyoung; Oh, Jae Eung; Yu, Bin; Xu, Gary; Lee, Juho

doi:10.1109/access.2021.3068977

Cited by 23 publications

(8 citation statements)

References 49 publications

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“…Figure 5 shows the UL sum-rate (

) of the training strategies per channel use according to the number of UEs (

) and the SI training overhead (

), where

dB [ 47 , 48 ] and

[ 38 ], and an 80 dB path loss (obtained by assuming a 100 m distance between the BS and UE with a path loss exponent of four [ 17 ]) between the BS and UE was considered. The UL sum-rates per channel use in Figure 5 are not normalized by the amount of training overhead

, and the SI channel estimation accuracy improves regardless of the training strategy as

increases.…”

Section: Simulation Resultsmentioning

confidence: 99%

Self-Interference Channel Training for Full-Duplex Massive MIMO Systems

Kim

Min

Park

2021

Sensors

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Full-duplex (FD) is a promising technology for increasing the spectral efficiency of next-generation wireless communication systems. A major technical challenge in enabling FD in a real network is to remove the self-interference (SI) caused by simultaneous transmission and reception at the transceiver, and the SI cancellation performance depends significantly on the estimation accuracy of the SI channel. In this study, we proposed a novel partial SI channel training method for minimizing the residual SI power for FD massive multiple-input multiple-output (MIMO) systems. Based on an SI channel training framework under a limited training overhead, using the proposed scheme, the BS estimates only a part of the SI channel vectors, while skipping the channel training for the other remaining SI channel vectors by using their last estimates. With this partial training framework, the proposed scheme finds the optimal partial SI channel training strategy for pilot allocation to minimize the expected residual SI power, considering the time-varying Rician fading channel model for the SI channel. Therefore, the proposed scheme can improve the sum-rate performance compared with other simple partial training schemes for FD massive MIMO systems under a limited training overhead. Numerical results confirm the effectiveness of the proposed scheme for FD massive MIMO systems compared with the full training scheme, as well as other partial training schemes.

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“…Figure 5 shows the UL sum-rate (

) of the training strategies per channel use according to the number of UEs (

) and the SI training overhead (

), where

dB [ 47 , 48 ] and

, and the SI channel estimation accuracy improves regardless of the training strategy as

increases.…”

Section: Simulation Resultsmentioning

confidence: 99%

Self-Interference Channel Training for Full-Duplex Massive MIMO Systems

Kim

Min

Park

2021

Sensors

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“…We first discuss the potential of JPTA using simple linkbudget calculations, similar to the analysis done in [51]. The calculations are shown in Table 5 From the table, we can see that to maintain a 10% BLER at max, the path loss has to be at maximum 155.04, 160.96, and 170.44, in dB for the three cases presented in the table (PAA, JPTA with 8 spatial zones (N SZ = 8), JPTA with 1 spatial zone (N SZ = 1)).…”

Section: A Link-budget Analysismentioning

confidence: 99%

Extending Uplink Coverage of mmWave and Terahertz Systems Through Joint Phase-Time Arrays

AlAmmouri

Ratnam

et al. 2022

IEEE Access

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In this paper, we establish the potential of joint phase-time arrays (JPTAs) for uplink coverage extension in cellular systems. JPTA allows the base station (BS) to create frequency-dependent widebeams without sacrificing the array gain. In this work, we propose a novel use case of JPTA where the BS exploits the frequency-dependent beams to serve multiple users' equipment (UEs) at different directions simultaneously with the full array gain and with no inter-UE interference. This is achieved by assigning each UE a corresponding bundle of sub-carriers that benefit from the full array-gain. A key feature of this scheme is the prolonged channel access for uplink communication for each user, due to the BS's ability to serve multiple UEs at the same time. We focus on two performance metrics: uplink coverage and uplink throughput. Our results show that using JPTA can extend the uplink coverage range by 3× while boosting the uplink throughput by providing more flexibility for the BS in resource allocation. These results are based on both theoretical analysis and 3GPP spec-compliant simulations with a sub-terahertz transceiver prototype.

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“…To justify the deployment of wireless networks equipped with full-duplex, it is paramount that researchers conduct studies that prove its network-level gains over traditional multiplexing strategies, such as TDD, FDD, and space-division multiple access, as well as the recently-proposed cross-division duplexing (XDD) [90]. This has been examined fairly extensively for sub-6 GHz wireless networks but less so for mmWave networks and applications of IAB, in particular.…”

Section: Network-level Studies Comparing Full-duplex To Other Duplexi...mentioning

confidence: 99%

Full-Duplex Transceivers for Next-Generation Wireless Communication Systems

Roberts¹,

Suraweera²

2022

Preprint

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Wireless communication systems can be enhanced at the link level, in medium access, and at the network level when transceivers are equipped with fullduplex capability: the transformative ability to simultaneously transmit and receive over the same frequency spectrum. Effective methods to cancel self-interference are required to facilitate full-duplex operation, which we overview herein in the context of traditional radios, along with those in next-generation wireless networks. We highlight advances in self-interference cancellation that leverage machine learning, and we summarize key considerations and recent progress in full-duplex millimeterwave systems and their application in integrated access and backhaul. We present example design problems and noteworthy findings from recent experimental research to introduce and motivate the advancement of full-duplex millimeter-wave systems. We conclude this chapter by forecasting the future of full-duplex and outlining important research directions that warrant further study.

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Extending 5G TDD Coverage With XDD: Cross Division Duplex

Cited by 23 publications

References 49 publications

Self-Interference Channel Training for Full-Duplex Massive MIMO Systems

Self-Interference Channel Training for Full-Duplex Massive MIMO Systems

Extending Uplink Coverage of mmWave and Terahertz Systems Through Joint Phase-Time Arrays

Full-Duplex Transceivers for Next-Generation Wireless Communication Systems

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