Hybrid Analog–Digital Precoding Revisited Under Realistic RF Modeling

García‐Rodríguez, Adrián; Venkateswaran, Vijay; Rulikowski, Pawel; Masouros, Christos

doi:10.1109/lwc.2016.2598777

Cited by 85 publications

(74 citation statements)

References 10 publications

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“…Using the similar method, the desired result is directly obtained by directly utilizing the results provided in (20) and setting the other parameters being constant except the number of RF chains.…”

Section: Corollary 6 Keeping the Number Of Bs Antennas The Snr Thementioning

confidence: 99%

“…Fortunately, the work of [20] found that using discrete Fourier transform (DFT) processing at analog domain has similar nature with electromagnetic lens and outperforms the fully connected phase shifters, which has low power consumption and is easy to implement. In light of these benefits, the DFT processing at the analog domain has gained great attention [21].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Low Cost and High Efficiency Hybrid Architecture Massive MIMO Systems Based on DFT Processing

Tan

Carvalho

et al. 2018

Wireless Communications and Mobile Computing

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Low cost and high efficiency, defined as energy efficiency (EE) and spectral efficiency (SE), have raised more and more attention in the fifth generation (5G) communication systems due to steadily rising hardware cost, energy consumption, and mobile traffic. This paper studies the hybrid architecture of multiuser massive MIMO systems, where the digital domain utilizes the zero-forcing (ZF) precoding scheme and the analog domain uses discrete Fourier transform (DFT) processing that significantly reduces hardware cost and energy consumption. We derive analytical expressions on the total achievable SE and EE, as well as offering insight into some engineering parameters in the system performance. Our aim is to achieve low cost and high efficiency massive MIMO system, with constraints on the overall transmit power, the number of users, and the number of radio frequency (RF) chains. Results exhibit that the total achievable SE of the hybrid architectures with DFT precessing is inferior to the full digital architectures and hybrid architectures with the ideal phase shifters, but the performance attenuation can be compensated by providing the more input SNR and higher number of RF chains. Moreover, we find that the total achievable EE of hybrid architectures with DFT precessing outperforms other massive MIMO architectures that include a full digital implementation, ideal phase shifters, and a switched network.

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Section: Corollary 6 Keeping the Number Of Bs Antennas The Snr Thementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Low Cost and High Efficiency Hybrid Architecture Massive MIMO Systems Based on DFT Processing

Tan

Carvalho

et al. 2018

Wireless Communications and Mobile Computing

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show abstract

“…The analog precoding block in Fig. 1 can be implemented using any of the proposals in [5]- [8]. It transforms the vector to ∈ ℂ ×1 in analog domain, and is updated at rate a .…”

Section: The Proposed Hybrid A-d Precodermentioning

confidence: 99%

“…Several implementation ideas for the analog part of hybrid A-D have been proposed in literature, including analog phase shifter networks [5]- [7] and Buttler matrices [8]. The main problem in implementing the analog part is that RF operations such as phase shifters and combiners normally lead to RF loss.…”

Section: Introductionmentioning

confidence: 99%

A novel hybrid analog-digital transmitter for multi-antenna base stations

Sedaghat

Gäde

Müller

et al. 2017

2017 25th European Signal Processing Conference (EUSIPCO)

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Abstract-A new hybrid Analog-Digital (hybrid A-D) precoder is proposed for multi-antenna base stations in massive MultipleInput Multiple-Output (MIMO) which allows a trade-off between the number of required RF-chains and the update rate of the analog part. It is shown that the number of RF-chains can be reduced even below the number of eigenmodes of the channel, thereby closing the gap between the standard hybrid A-D and the single-RF MIMO. This is achieved by dividing the input data streams into blocks and jointly optimizing the digital and the analog precoder parts for each block. The analog part of the precoder needs to be updated once per block and remains static over each block interval. Out of band radiation due to switching is resolved by inserting a short guard interval between blocks. It is shown the number of RF-chains can be any arbitrary positive integer to obtain zero distortion at the user terminals if the update rate is high enough. The proposed precoder offers a significant performance gain at the expenses of data dependent precoding and higher update rates of the analog part.

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“…Literature suggests that there will be a little amount of phase errors, which affect the return losses of the antenna array operating at a fixed frequency [25][26][27]33]. Another aspect is the choice of materials that would affect the size and insertion loss of a Butler matrix [28][29][30][31][32]. This paper is organized into four major sections.…”

Section: Introductionmentioning

confidence: 99%

Design Approach of Multibeam Using Phased Array Antenna Aided With Butler Matrix for a Fixed Coverage Area

Vani¹,

Subhashini²

2018

PIER B

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Abstract-This paper devises a framework of phased array antennas to radiate multiple beams for a fixed coverage. The phased antenna array is chosen so that the beamforming can be fixed in selected coverage area. The antenna arrays are employed with a Butler matrix (BM) to form required phases of excitation coefficients to the radiating elements. Optimally designed 4 × 4 or 8 × 8 Butler matrix is utilized at the I/O ports of the phased antenna array. The grating lobes are reduced by using the principle of orthogonality to the feeds of subarray (group of column arrays of phased array). This article also exploits the concept of skirt elements to reach the desired coverage area while reducing the beam overlapping in the restricted area. Simulation studies highlight the proposed claims with elaborated numerical analysis of different case studies.

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Hybrid Analog–Digital Precoding Revisited Under Realistic RF Modeling

Cited by 85 publications

References 10 publications

Low Cost and High Efficiency Hybrid Architecture Massive MIMO Systems Based on DFT Processing

Low Cost and High Efficiency Hybrid Architecture Massive MIMO Systems Based on DFT Processing

A novel hybrid analog-digital transmitter for multi-antenna base stations

Design Approach of Multibeam Using Phased Array Antenna Aided With Butler Matrix for a Fixed Coverage Area

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