Monopulse Beam Synthesis Using a Sparse Single Layer of Weights

Kwak, Semin; Chun, Joohwan; Ye, Sung Hyuck

doi:10.1109/tap.2019.2899850

Cited by 9 publications

(2 citation statements)

References 25 publications

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“…However, for the dynamic subarray case, the situation is more complicated. The synthesis of the sum or difference beam under the dynamic subarray cannot utilize a simple closed-form analytic solution and requires a complex numerical computation [63]- [65]. However, assuming such a numerical method is available for providing sum and difference beams satisfying both (20) and (21), the proposed AoA error estimation can be applied to the dynamic subarray case in a straightforward manner.…”

Section: B: Monopulse Ratio Based Aoa Error Estimatormentioning

confidence: 99%

Hybrid Precoding Based on Monopulse Ratio for Millimeter Wave Systems With Limited Feedback

2020

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Multiuser hybrid precoding in 5G NR mmWave communication system faces significant challenges such as establishing accurate directional radio links and maintaining links for mobile stations (MSs) moving in outdoor environments. A conventional solution relies on finite codebook-based beam sweeping for initial first-stage beam acquisition and subsequent second-stage beam tracking by sweeping adjacent beam pairs. However, such a conventional solution has inevitable residual AoA/AoD errors even after the best beam pair is established in the first stage and incurs nonnegligible overheads to sound adjacent beam pairs for maintaining the best beam pair in the second stage. To overcome these problems, a novel codebook-based two-stage solution that combines a novel beam tracking protocol with a low sounding overhead, a unique receiver structure employing a beam scheduler and a beam tester, and a fine accuracy residual AoA/AoD error estimation algorithm based on the monopulse ratio concept is proposed. The solution is unique because of the receiver structure for the residual AoA/AoD error estimation that exploits the cyclic prefix in OFDM systems, inspired by the monopulse ratio in radar systems. Moreover, it can be applied to MSs with a single RF chain. This solution, using the proposed receiver structure and algorithm, can establish a more accurate directional beam pair right after the initial beam sweeping in the first stage. For beam tracking in the second stage, it estimates the residual AoA/AoD errors of the current best beam pair rather than sweeping adjacent beam pairs, thereby reducing beam tracking overheads. Numerical evaluation and computer simulations show that the proposed solution offers more accurate beam acquisition (i.e., average array gain improvement of several dB) and costs considerably reduced beam sounding overheads compared to the conventional solution. Lastly, a ray-tracing tool is used to demonstrate that our solution is effective in practical channel parameters for outdoor environments. INDEX TERMS Monopulse ratio, mmWave, multiuser hybrid precoding, limited feedback, AoA/AoD, beam acquisition, beam tracking, cyclic prefix, OFDM, and single RF chain.

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Section: B: Monopulse Ratio Based Aoa Error Estimatormentioning

confidence: 99%

Hybrid Precoding Based on Monopulse Ratio for Millimeter Wave Systems With Limited Feedback

2020

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“…Each weight vector set forms a sparse subarray to form a single beam. Our algorithm decomposes the original nonconvex optimization problem into the problem of finding disjoint weight vectors [26]. Morabito proposed a new synthetic one-dimensional reconfigurable sparse array method, which can generate summation and difference power patterns.…”

Section: Introductionmentioning

confidence: 99%

A PSO-CVX Algorithm of Sum and Difference Beam Patterns for Time-Modulated Antenna Array

Dong

Tan

et al. 2021

International Journal of Antennas and Propagation

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An integrated optimization of sum and difference beam for time-modulated linear antenna array is studied in this paper. The goal of sum and difference beam synthesis is to generate sum beam in the main band and difference beams in the first-order sideband with low side-lobe level through timing switches. The turn-on times of antenna array are achieved by solving a quadratic constraint linear programming; meanwhile, the opening times are optimized by particle swarm optimization algorithm. The results of linear array show that the sum and difference beam can be scanned within ± 40 degrees, with lower peak side-lobe level.

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