Hybrid Precoding With Time-Modulated Arrays for Mmwave MIMO Systems

González-Coma, José P.; Maneiro-Catoira, Roberto; Castedo, Luis

doi:10.1109/access.2018.2874005

Cited by 17 publications

(40 citation statements)

References 41 publications

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“…To evaluate the SR incurred by the TMA, we depict in Fig. 8 the total transmit power efficiency η TX η OFF [see (9) and (11)] obtained with the analog network with SPDT switches, and compare with that achieved using the analog network with SPST switches [4]. To distinguish between the two methods, the markers have been removed for the curves corresponding to the analog network with SPST switches.…”

Section: B Sr Reductionmentioning

confidence: 99%

“…Therefore, the total transmit power employed to achieve the performance results of Fig. 5 might be much larger for the curve corresponding to the benchmark codebookPSZF, depending on many factors such as the PS technology or the carrier frequency ω c [4]. For instance, using the reference values for a 4-bit PS, a 1-bit PS [4], a SPDT [32], and an adder [33], the power savings are about 2dB.…”

Section: B Sr Reductionmentioning

confidence: 99%

“…5 might be much larger for the curve corresponding to the benchmark codebookPSZF, depending on many factors such as the PS technology or the carrier frequency ω c [4]. For instance, using the reference values for a 4-bit PS, a 1-bit PS [4], a SPDT [32], and an adder [33], the power savings are about 2dB. The remarkable achievable performance, together with the superior efficiency, reveals the great interest of the proposed analog precoder design.…”

Section: B Sr Reductionmentioning

confidence: 99%

“…Time-Modulated Array (TMA) is an unconventional way to perform analog precoding using switches operating periodically instead of Phase Shifters (PSs) [4]. From a circuit perspective, RF switches exhibit significant advantages with respect to PSs like lower Insertion Lossess (ILs), less power consumption, reduced implementation costs and absence of quantization errors [5].…”

Section: Introductionmentioning

confidence: 99%

“…Recent work on hybrid digital-analog precoding shows the suitability of TMAs to develop low-cost analog processing networks [4]. Therein, the authors pose an architecture employing SPST switches and simple 1-bit PSs to obtain signed realvalued analog precoding matrices.…”

Section: Introductionmentioning

confidence: 99%

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Power Efficient Scheduling and Hybrid Precoding for Time Modulated Arrays

González-Coma¹,

Castedo²

2019

Preprint

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We consider power efficient scheduling and precoding solutions for multiantenna hybrid digital-analog transmission systems that use Time-Modulated Arrays (TMAs) in the analog domain. TMAs perform beamforming with switches instead of conventional Phase Shifters (PSs). The extremely low insertion losses of switches, together with their reduced power consumption and cost make TMAs attractive in emerging technologies like massive Multiple-Input Multiple-Output (MIMO) and millimeter wave (mmWave) systems. We propose a novel analog processing network based on TMAs and provide an angular scheduling algorithm that overcomes the limitations of conventional approaches. Next, we pose a convex optimization problem to determine the analog precoder. This formulation allows us to account for the Sideband Radiation (SR) effect inherent to TMAs, and achieve remarkable power efficiencies with a very low impact on performance. Computer experiments results show that the proposed design, while presenting a significantly better power efficiency, achieves a throughput similar to that obtained with other strategies based on angular selection for conventional architectures.<br>

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Section: B Sr Reductionmentioning

confidence: 99%

Section: B Sr Reductionmentioning

confidence: 99%

Section: B Sr Reductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Power Efficient Scheduling and Hybrid Precoding for Time Modulated Arrays

González-Coma¹,

Castedo²

2019

Preprint

Self Cite

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Bidirectional beamforming with +1st harmonic in time‐modulated linear arrays using two switching sequences

Miao

et al. 2020

Micro & Optical Tech Letters

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In this study, a novel scheme is proposed for bidirectional beamforming using time-modulated linear arrays (TMLAs). A beamforming method with a time shift was adopted to obtain the bidirectional pattern with the +1st harmonic using two switching sequences. Furthermore, the genetic algorithm was modified to obtain an additional beam using the fundamental component. In the proposed approach, the direction and sidelobe of the beam can be controlled by designing switching sequences, resulting in low complexity and a flexible structure in case of bidirectional beamforming. The simulation results show the effectiveness of the proposed methods, and the levels of the sidelobe and null were reduced to −20 and −53.7 dB, respectively.

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