Reliable Positioning and mmWave Communication via Multi-Point Connectivity

Kumar, Dileep; Saloranta, Jani; Kaleva, Jarkko; Destino, Giuseppe; Tölli, Antti

doi:10.3390/s18114001

Cited by 11 publications

(5 citation statements)

References 54 publications

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“…where φ 1 b,k and φ m b,k denote the angle-of-arrival (AoA) at kth user for the LoS and the m-th non-LoS (NLoS) path, respectively. Note that the AoA for each NLoS path m > 1 is assumed to be uniformly distributed, i.e., φ m b,k ∈ [−π/2, π/2], whereas, the LoS AoA φ 1 b,k is related to the actual position of RRU-user (b, k) pair [34]. Finally, g…”

Section: B Channel Modelmentioning

confidence: 99%

Blockage-Aware Reliable mmWave Access via Coordinated Multi-Point Connectivity

Kumar

Kaleva

Tölli

2021

IEEE Trans. Wireless Commun.

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The fundamental challenge of the millimeter-wave (mmWave) frequency band is the sensitivity of the radio channel to blockages, which gives rise to unstable connectivity and impacts the reliability of a system. To this end, multipoint connectivity is a promising approach for ensuring the desired rate and reliability requirements. A robust beamformer design is proposed to improve the communication reliability by exploiting the spatial macro-diversity and a pessimistic estimate of rates over potential link blockage combinations. Specifically, we provide a blockage-aware algorithm for the weighted sum-rate maximization (WSRM) problem with parallel beamformer processing across distributed remote radio units (RRUs). Combinations of non-convex and coupled constraints are handled via successive convex approximation (SCA) framework, which admits a closed-form solution for each SCA step, by solving a system of Karush-Kuhn-Tucker (KKT) optimality conditions. Unlike the conventional coordinated multi-point (CoMP) schemes, the proposed blockage-aware beamformer design has, per-iteration, computational complexity in the order of RRU antennas instead of system-wide joint transmit antennas. This leads to a practical and computationally efficient implementation that is scalable to any arbitrary multi-point configuration. In the presence of random blockages, the proposed schemes are shown to significantly outperform baseline scenarios and result in reliable mmWave communication.

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Section: B Channel Modelmentioning

confidence: 99%

Blockage-Aware Reliable mmWave Access via Coordinated Multi-Point Connectivity

Kumar

Kaleva

Tölli

2021

IEEE Trans. Wireless Commun.

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“…The authors of [ 11 ] presented recent advances in the field of wireless positioning under sensor mobility, highlighting the importance of mobility exploitation, sensor cooperation in terms of processing power, and advanced signal processing techniques. Reliable positioning in a multipoint connectivity scenario was considered in [ 12 ]. As it was shown, the use of coordinated multipoint reception increases positioning accuracy considerably.…”

Section: Prior Workmentioning

confidence: 99%

Monitoring for Rare Events in a Wireless Powered Communication mmWave Sensor Network

Koutsioumpos

Zervas

Hadjiefthymiades

et al. 2020

Sensors

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The use of a wireless sensor network to monitor an area of interest for possible hazardous events has become a common practice. The difficulty of replacing or recharging sensor batteries dictates the use of energy harvesting as a means to extend the network’s lifetime. To this end, energy beamforming is used in a millimeter wave wireless power sensor network with randomly deployed nodes. A simple protocol is proposed that allows nodes to report their charging conditions in an effort to select efficient energy-beamforming strategies. Analytical expressions for the probability of successful information reception and successful reporting are provided for two benchmark schemes: the random and the circular energy-beamforming scheme. A Markov chain is used for the former to model the energy level of sensor nodes. Simple sector selection strategies are presented and their performance, in terms of delay and failure information delivery, is assessed through simulations.

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“…where ϕ 1 b,k (ϕ m b,k ) denotes the angle-of-departure (AoD) for a LoS (NLoS) path. Note that the AoD for each NLoS path m is assumed to be uniformly distributed ϕ m b,k ∈ [0, 2π], whereas, ϕ 1 b,k is related to actual position of BS-user (b, k) pair [15]. The transmit array steering vector of ULA is a…”

Section: A Channel and Blockage Modelmentioning

confidence: 99%

“…In addition to (15) and the feasibility constraints, the KKT conditions also include the complementary slackness conditions as…”

Section: Appendix Amentioning

confidence: 99%

Rate and Reliability Trade-Off for mmWave Communication via Multi-Point Connectivity

Kumar

Kaleva

Tölli

2019

2019 IEEE Global Communications Conference (GLOBECOM)

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The fundamental challenge of mmWave frequency band is the sensitivity of the radio channel to blockage, which gives rise to unstable connectivity and also impacts the reliability of a system. In this paper, we explore the viability of using Coordinated Multi-point (CoMP) connectivity for robust and resilient downlink communication. We provide a novel iterative algorithm for Weighted Sum-Rate Maximization (WSRM) problem leveraging Successive Convex Approximation (SCA) with low computational complexity, which admits closed-form solution via iterative evaluation of optimal Karush-Kuhn-Tucker (KKT) conditions. Unlike in the conventional CoMP schemes, the propose precoder design has, per-iteration, computational complexity in the order of base-station (BS) antennas instead of system-wide joint transmit antennas. This is achieved by splitting the beamformer design to be parallel across the coordinating BSs. For the downlink precoder design, a conservative estimate of the user specific rate is obtained by considering possible combinations of potentially blocked links. In the presence of random blockages, the effective throughput and outage performance of the proposed method significantly outperform several baseline scenarios, hence providing more reliable connectivity.

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Reliable Positioning and mmWave Communication via Multi-Point Connectivity

Cited by 11 publications

References 54 publications

Blockage-Aware Reliable mmWave Access via Coordinated Multi-Point Connectivity

Blockage-Aware Reliable mmWave Access via Coordinated Multi-Point Connectivity

Monitoring for Rare Events in a Wireless Powered Communication mmWave Sensor Network

Rate and Reliability Trade-Off for mmWave Communication via Multi-Point Connectivity

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