Air-to-Ground Directional Channel Sounder With 64-antenna Dual-polarized Cylindrical Array

Gomez, Ponce, Jorge; Choi, Kup‐Sze; Abbasi, Naveed A.; Adame, Aldo; Alvarado, Alexander; Bullard, Colton; Shen, Ruiyi; Daneshgaran, F.; Dhillon, Harpreet S.; Molisch, Andreas F.

doi:10.48550/arxiv.2103.09135

Cited by 4 publications

(11 citation statements)

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“…We acquired our channel data with a measurement setup ("channel sounder") that includes a transmitter (TX) on a drone [34] and a receiver (RX) on the ground (Fig. 2).…”

Section: A Channel Soundermentioning

confidence: 99%

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Energy Efficiency of Uplink Cell-Free Massive MIMO With Transmit Power Control in Measured Propagation Channel

Choi,

Ito,

Kanno

et al. 2021

Preprint

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Cell-free massive MIMO (CF-mMIMO) provides wireless connectivity for a large number of user equipments (UEs) using access points (APs) distributed across a wide area with high spectral efficiency (SE). The energy efficiency (EE) of the uplink is determined by (i) the transmit power control (TPC) algorithms, (ii) the numbers, configurations, and locations of the APs and the UEs, and (iii) the propagation channels between the APs and the UEs. This paper investigates all three aspects, based on extensive (∼30,000 possible AP locations and 128 possible UE locations) channel measurement data at 3.5 GHz. We compare three different TPC algorithms, namely maximization of transmit power (max-power), maximization of minimum SE (max-min SE), and maximization of minimum EE (max-min EE) while guaranteeing a target SE. We also compare various antenna arrangements including fully-distributed and semi-distributed systems, where APs can be located on a regular grid or randomly, and the UEs can be placed in clusters or far apart. Overall, we show that the max-min EE TPC is highly effective in improving the uplink EE, especially when no UE within a set of served UEs is in a bad channel condition and when the BS antennas are fully-distributed.

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“…We acquired our channel data with a measurement setup ("channel sounder") that includes a transmitter (TX) on a drone [34] and a receiver (RX) on the ground (Fig. 2).…”

Section: A Channel Soundermentioning

confidence: 99%

“…Therefore, 1×8×2301 channel matrix may be captured at every 5 cm of drone movement. The characteristics of the drone sounder and the channel measurement principle for CF-mMIMO systems are further discussed in [2], [34].…”

Section: A Channel Soundermentioning

confidence: 99%

Energy Efficiency of Uplink Cell-Free Massive MIMO With Transmit Power Control in Measured Propagation Channel

Choi,

Ito,

Kanno

et al. 2021

Preprint

Self Cite

View full text Add to dashboard Cite

show abstract

“…We acquired our channel data with a sounder that includes a transmitter (TX) on a drone [26] and a receiver (RX) on the ground (Fig. 2).…”

Section: A Channel Soundermentioning

confidence: 99%

“…4 Therefore, 8×2301 channel matrix may be captured at every 5 cm of drone movement. The characteristics of the drone sounder and the channel measurement principle for CF-mMIMO systems are further discussed in [2], [26].…”

Section: A Channel Soundermentioning

confidence: 99%

See 1 more Smart Citation

Uplink Energy Efficiency of Cell-Free Massive MIMO With Transmit Power Control in Measured Propagation Channels

Choi,

Ito,

Kanno

et al. 2021

Preprint

Self Cite

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Cell-free massive MIMO (CF-mMIMO) is expected to provide reliable wireless services for a large number of user equipments (UEs) using access points (APs) distributed across a wide area. When the UEs are battery-powered, uplink energy efficiency (EE) becomes an important performance metric for CF-mMIMO systems. Therefore, if the "target" spectral efficiency (SE) is met, it is important to optimize the uplink EE when setting the transmit powers of the UEs. Also, such transmit power control (TPC) method must be tested on channel data from real-world measurements to prove its effectiveness. In this paper, we compare three different TPC algorithms using zero-forcing reception by applying them to 3.5 GHz channel measurement data featuring ∼30,000 possible AP locations and 8 UE locations in a 200m×200m area. We show that the max-min EE algorithm is highly effective in improving the uplink EE at a target SE, especially if the number of single-antenna APs is large, circuit power consumption is low, and the maximum allowed transmit power of the UEs is high.Index Terms-Cell-free (distributed) massive MIMO, energy efficiency, transmit power control, experimental evaluations, channel sounding, drone (UAV) channel sounder

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6G Radio Testbeds: Requirements, Trends, and Approaches

Callebaut,

Liu,

Eriksson

et al. 2024

IEEE Microwave

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The proof of the pudding lies in eating, that is why 6G testbeds are essential in the progress towards the next generation of wireless networks. Theoretical research towards 6G wireless networks proposes advanced technologies to serve new applications and drastically improve the energy performance of the network. Testbeds are indispensable to validate these new technologies under more realistic conditions. This paper clarifies the requirements for 6G radio testbeds, reveals trends, and introduces approaches toward their development.The sixth-generation of mobile networks is expected to be introduced starting 2030. Research and development toward this novel generation of networks started several years ago in different regions of the world, e.g., [2]. A myriad of applications and novel use cases, ranging from augmented reality (AR) and mixed reality (MR) in professional and entertainment contexts to support autonomous systems and connecting a massive number of battery-less devices, are envisioned to be served by these networks [3]. The analysis of these use cases has led to a harmonized view of which functions and capabilities 6G networks should offer. Summarizing, the desired features for 6G can be classified into three main categories:1) Improving diverse wireless network services: delivering higher throughput and network capacity, ultra-reliable operation, imperceptible latency, and connectivity to many devices with an extremely low-energy budget. 2) Providing novel functionalities: precise positioning and sensing [4], and communication with energy-neutral devices requiring wireless-power transfer [5]. 3) Enhancing coverage: delivering more uniform and truly ubiquitous services.

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Air-to-Ground Directional Channel Sounder With 64-antenna Dual-polarized Cylindrical Array

Cited by 4 publications

References 0 publications

Energy Efficiency of Uplink Cell-Free Massive MIMO With Transmit Power Control in Measured Propagation Channel

Energy Efficiency of Uplink Cell-Free Massive MIMO With Transmit Power Control in Measured Propagation Channel

Uplink Energy Efficiency of Cell-Free Massive MIMO With Transmit Power Control in Measured Propagation Channels

6G Radio Testbeds: Requirements, Trends, and Approaches

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