Generalized Hybrid Beamforming for Vehicular Connectivity Using THz Massive MIMO

Busari, Sherif Adeshina; Huq, Kazi Mohammed Saidul; Mumtaz, Shahid; Rodrı́guez, Jonathan; Fang, Yi; Sicker, Douglas; Al‐Rubaye, Saba; Tsourdos, Antonios

doi:10.1109/tvt.2019.2921563

Cited by 116 publications

(60 citation statements)

References 30 publications

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“…(42) Note that (S) TS = diag(L 0 , L −L 0 ), according to (6). The solution to a relaxed version of this problem is formulated in the following theorem.…”

Section: Hybrid Combing Of Directional Antennasmentioning

confidence: 99%

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Hybrid Combining of Directional Antennas for Periodic Broadcast V2V Communication

Lehocine

Ström

Brännström

2022

IEEE Trans. Intell. Transport. Syst.

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A hybrid analog-digital combiner for broadcast vehicular communication is proposed. It has an analog part that does not require any channel state information or feedback from the receiver, and a digital part that uses maximal ratio combining (MRC). We focus on designing the analog part of the combiner to optimize the received signal strength along all azimuth angles for robust periodic vehicle-to-vehicle (V2V) communication, in a scenario of one dominant component between the communicating vehicles (e.g., highway scenario). We show that the parameters of a previously suggested fully analog combiner solves the optimization problem of the analog part of the proposed hybrid combiner. Assuming L directional antennas with uniform angular separation together with the special case of a two-port receiver, we show that it is optimal to combine groups of L/2 and L/2 antennas in analog domain and feed the output of each group to one digital port. This is shown to be optimal under a sufficient condition on the sidelobes level of the directional antenna. Moreover, we derive a performance bound for the hybrid combiner to guide the choice of antennas needed to meet the reliability requirements of the V2V communication links.

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“…(42) Note that (S) TS = diag(L 0 , L −L 0 ), according to (6). The solution to a relaxed version of this problem is formulated in the following theorem.…”

Section: Hybrid Combing Of Directional Antennasmentioning

confidence: 99%

“…The design objective is, typically, maximizing the rate or the signalto-noise ratio (SNR) experienced by the user [3]. An example of a study of HCs that take into account vehicular users is [6]. There, a general framework is set for the design of hybrid beamformers/combiners according to three main architectures.…”

Section: Introductionmentioning

confidence: 99%

Hybrid Combining of Directional Antennas for Periodic Broadcast V2V Communication

Lehocine

Ström

Brännström

2022

IEEE Trans. Intell. Transport. Syst.

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“…By defining b = P π1 h (1) , h (1) = C d h (2) , h (2) = P π2 h (3) , h (3) = E v h (4) , h (4) = P π3 h (5) , h (5) = Dvh (6) , h (6) = P π4 a, (105) we can further have…”

Section: Appendix Dmentioning

confidence: 99%

“…Moreover, an extensive theory for massive MIMO has been developed in recent years, including capacity and spectral efficiency analysis, system design for high energy efficiency, pilot contamination, etc. However, implementation of such systems faces many technical difficulties, and to this day remains very challenging and costly [6], [7]. In conventional fully-digital (FD) MIMO systems, each antenna element requires a dedicated radio frequency (RF) chain.…”

Section: Introductionmentioning

confidence: 99%

Generalized Framework for Hybrid Analog/Digital Signal Processing in Massive and Ultra-Massive-MIMO Systems

2020

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The conventional fully-digital implementation of massive-MIMO systems is not efficient due to the large required number of radio-frequency (RF) chains. To address this issue, hybrid analog/digital (A/D) beamforming was proposed and to date remains a topic of ongoing research. In this paper, we explore the hybrid A/D structure as a general framework for signal processing in massive and ultra-massive-MIMO systems. To exploit the full potential of the analog domain, we first focus on the analog signal processing (ASP) network. We investigate a mathematical representation suitable for any arbitrarily connected feed-forward ASP network comprised of the common RF hardware elements in the context of hybrid A/D systems, i.e., phase-shifter and power-divider/combiner. A novel ASP structure is then proposed which is not bound to the unit modulus constraint, thereby facilitating the hybrid A/D systems design. We then study MIMO transmitter and receiver designs to exploit the full potential of digital processing as well. It is shown that replacing the linear transformation in the digital domain with a generic mapping can improve the system performance. In some cases, the performance of optimal fully-digital MIMO systems can be achieved without extra calculations compared to sub-optimal hybrid A/D techniques. An optimization model based on the proposed structure is presented that can be used for hybrid A/D system design. Specifically, precoding and combining designs under different conditions are discussed as examples. Finally, simulation results are presented which illustrate the superiority of the proposed architecture to the conventional hybrid designs for massive-MIMO systems. INDEX TERMS Hybrid beamforming, hybrid analog and digital signal processing, ultra massive MIMO, massive MIMO, precoding, combining, beamforming.

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“…Towards 5G/B5G, the third generation partnership project (3GPP) is finalizing Release 16 and defining Release 17 1 . In the area of vehicular networks, the 3GPP, in partnership with the Fifth Generation Automotive Association (5GAA), is driving the efforts on 5G-based vehicle-to-everything (V2X) paradigm which adds advanced features to the LTE-V2X from Release 14, particularly in the areas of support for ultrareliable and low-latency communication (URLLC) applications for the future intelligent transport systems (ITS) [1], [2], [3]. In the evolution path from LTE-V2X to 5G-V2X, the authors in [1] advocated the incorporation of softwaredefined networking (SDN) in the architecture to enhance the system perfromance through SDN's capabilities in facilitating intelligent multihop routing, dynamic resource allocation and advanced mobility support, among others.…”

Section: Introductionmentioning

confidence: 99%

SDN-Sim: Integrating a System-Level Simulator with a Software Defined Network

Ghosh¹,

Busari²,

Dagiuklas³

et al. 2020

IEEE Comm. Stand. Mag.

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With the introduction of diverse technology paradigms in next-generation cellular and vehicular networks, design and structural complexity are skyrocketing. The beyond-5G use cases such as mobile broadband, 5G-V2X and UAV communications require support for ultra-low latency and high throughput and reliability with limited operational complexity and cost. These use cases are being explored in 3GPP Release 16 and 17. To facilitate end-to-end performance evaluation for these applications, we propose SDN-Sim-an integration of a System Level Simulator (SLS) with a Software Defined Network (SDN) infrastructure. While the SLS models the communication channel and evaluates system performance on the physical and data link layers, the SDN performs network and application tasks such as routing, load balancing, etc. The proposed architecture replicates the SLS-defined topology into an SDN emulator for offloading control operations. It uses link and node information calculated by the SLS to compute routes in SDN and feeds the results back to the SLS. Along with the architecture, data modeling and processing, replication and route calculation frameworks are proposed.

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Generalized Hybrid Beamforming for Vehicular Connectivity Using THz Massive MIMO

Cited by 116 publications

References 30 publications

Hybrid Combining of Directional Antennas for Periodic Broadcast V2V Communication

Hybrid Combining of Directional Antennas for Periodic Broadcast V2V Communication

Generalized Framework for Hybrid Analog/Digital Signal Processing in Massive and Ultra-Massive-MIMO Systems

SDN-Sim: Integrating a System-Level Simulator with a Software Defined Network

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