Experimental evaluation of digital beamforming for 5G multi-site massive MIMO

Okuyama, Toru; Suyama, Satoshi; Mashino, Jun; Yoshioka, Shohei; Okumura, Yukihiko; Yamazaki, Kazuo; Nose, Daisuke; Maruta, Yasushi

doi:10.1109/wpmc.2017.8301860

Cited by 12 publications

(6 citation statements)

References 7 publications

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“…By considering the computed weights α k and evaluation at the weight α 2 in each step i.e. using (20), we have…”

Section: Theoretical Boundsmentioning

confidence: 99%

Efficient and Self-Recursive Delay Vandermonde Algorithm for Multi-Beam Antenna Arrays

Perera,

Madanayake,

Cintra

2022

Preprint

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This paper presents a self-contained factorization for the delay Vandermonde matrix (DVM), which is the super class of the discrete Fourier transform, using sparse and companion matrices. An efficient DVM algorithm is proposed to reduce the complexity of radio-frequency (RF) N-beam analog beamforming systems. There exist applications for wideband multi-beam beamformers in wireless communication networks such as 5G/6G systems, system capacity can be improved by exploiting the improvement of the signal to noise ratio (SNR) using coherent summation of propagating waves based on their directions of propagation. The presence of a multitude of RF beams allows multiple independent wireless links to be established at high SNR, or used in conjunction with multiple-input multiple-output (MIMO) wireless systems, with the overall goal of improving system SNR and therefore capacity. To realize such multi-beam beamformers at acceptable analog circuit complexities, we use sparse factorization of the DVM in order to derive a low arithmetic complexity DVM algorithm. The paper also establishes an error bound and stability analysis of the proposed DVM algorithm. The proposed efficient DVM algorithm is aimed at implementation using analog realizations. For purposes of evaluation, the algorithm can be realized using both digital hardware as well as software defined radio platforms.

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“…By considering the computed weights α k and evaluation at the weight α 2 in each step i.e. using (20), we have…”

Section: Theoretical Boundsmentioning

confidence: 99%

Efficient and Self-Recursive Delay Vandermonde Algorithm for Multi-Beam Antenna Arrays

Perera,

Madanayake,

Cintra

2022

Preprint

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“…The additive cost is based on the number of nonzero elements the rows of each W i matrix, as detailed in [6]. Therefore, the matrices W 1 , W 2 , and W 5 require 60 real additions; (3,3), (3,15), (4,4), (4,14), (5,5), (5,13), (6,6), (6,12), (7,7), (7,11), (8,8), (8,10), (9,9), (10,8), (11,7), (12,6), (13,5), (14,4), (15,3), (16,2), (17,1), (18,18), (18,32), (19,19), (19,31), (20,20), (20,30), (21,21),…”

Section: Fast Algorithm For Computing the 32-point Adftmentioning

confidence: 99%

“…(1,1), (1,5), (2,2), (2,4), (3,3), (4,2), (5,1), (6,6), (7,7), (7,9), (8,8), (9,7), (10,10), (11,11), (11,13), (12,12), (13,11), (14,14), (14,16), (15,15), (16,14), (17,17), (17,29), (18,18), (19,19), (20,20), (21,21), (21,25), (22,22), (23,23), (24,24), (25,21), (26,26), (27,27), (28,28), (29,17), (30,30), (31,31), (32,…”

Section: Fast Algorithm For Computing the 32-point Adftmentioning

confidence: 99%

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Towards a Low-SWaP 1024-beam Digital Array: A 32-beam Sub-system at 5.8 GHz

Madanayake,

Ariyarathna,

Madishetty

et al. 2022

Preprint

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Millimeter wave communications require multibeam beamforming in order to utilize wireless channels that suffer from obstructions, path loss, and multi-path effects. Digital multibeam beamforming has maximum degrees of freedom compared to analog phased arrays. However, circuit complexity and power consumption are important constraints for digital multibeam systems. A low-complexity digital computing architecture is proposed for a multiplication-free 32-point linear transform that approximates multiple simultaneous RF beams similar to a discrete Fourier transform (DFT). Arithmetic complexity due to multiplication is reduced from the FFT complexity of O (N log N) for DFT realizations, down to zero, thus yielding a 46% and 55% reduction in chip area and dynamic power consumption, respectively, for the N = 32 case considered. The paper describes the proposed 32-point DFT approximation targeting a 1024-beams using a 2D array, and shows the multiplierless approximation and its mapping to a 32-beam sub-system consisting of 5.8 GHz antennas that can be used for generating 1024 digital beams without multiplications. Real-time beam computation is achieved using a Xilinx FPGA at 120 MHz bandwidth per beam. Theoretical beam performance is compared with measured RF patterns from both a fixed-point FFT as well as the proposed multiplier-free algorithm and are in good agreement.

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“…In the low SHF bands, the Massive MIMO technology employing the fully digital BF is being investigated in collaboration with NEC [8]- [13], Huawei [14]- [21], and Nokia [22], [23]. Intersite coordination algorithm exploiting beam search information in the digital BF algorithm has been proposed [10] and performances of the proposed algorithm have been evaluated by computer simulations using channel data measured in outdoor propagation experiments [11]. Ultra-high-throughput Massive MIMO field trial with peak spectrum efficiency of 79.82 bps/Hz has been conducted [17], [18].…”

Section: Overview Of Recent 5g Experimental Trialsmentioning

confidence: 99%

Recent Activities of 5G Experimental Trials on Massive MIMO Technologies and 5G System Trials Toward New Services Creation

Okumura

Suyama

Mashino

et al. 2019

IEICE Trans. Commun.

Self Cite

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In order to cope with recent growth of mobile data traffic and emerging various services, world-wide system trials for the fifthgeneration (5G) mobile communication system that dramatically extends capability of the fourth-generation mobile communication system are being performed to launch its commercial service in 2020. In addition, research and development of new radio access technologies for 5G evolution and beyond 5G systems are beginning to be made all over the world. This paper introduces our recent activities on 5G transmission experiments that aim to validate Massive MIMO technologies using higher frequency bands such as SHF/EHF bands, that is, 5G experimental trials. Recent results of 5G system trials to create new services and applications in 5G era in cooperation with partners in vertical industries are also introduced.

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Experimental evaluation of digital beamforming for 5G multi-site massive MIMO

Cited by 12 publications

References 7 publications

Efficient and Self-Recursive Delay Vandermonde Algorithm for Multi-Beam Antenna Arrays

Efficient and Self-Recursive Delay Vandermonde Algorithm for Multi-Beam Antenna Arrays

Towards a Low-SWaP 1024-beam Digital Array: A 32-beam Sub-system at 5.8 GHz

Recent Activities of 5G Experimental Trials on Massive MIMO Technologies and 5G System Trials Toward New Services Creation

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