Design of Millimeter Wave Hybrid Beamforming Systems

Kwon, Girim; Shim, Yeonggyu; Park, Hyuncheol; Kwon, Hyuck M.

doi:10.1109/vtcfall.2014.6965933

Cited by 26 publications

(34 citation statements)

References 13 publications

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“…In this simulation, we examine the tightness of the upper bound rates given in (18) under equal power allocation policy. To this end, we take N = 64, N a = 16, K i = K max and K t = 8.…”

Section: ) Verification Of Theoretical Ratesmentioning

confidence: 99%

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On the Number of RF Chains and Phase Shifters, and Scheduling Design With Hybrid Analog–Digital Beamforming

Bogale

Haghighat

et al. 2016

IEEE Trans. Wireless Commun.

235

186

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This paper considers hybrid beamforming (HB) for downlink multiuser massive multiple input multiple output (MIMO) systems with frequency selective channels. The proposed HB design employs sets of digitally controlled phase (fixed phase) paired phase shifters (PSs) and switches. For this system, first we determine the required number of radio frequency (RF) chains and PSs such that the proposed HB achieves the same performance as that of the digital beamforming (DB) which utilizes N (number of transmitter antennas) RF chains. We show that the performance of the DB can be achieved with our HB just by utilizing r t RF chains and 2r t (N − r t + 1) PSs, where r t ≤ N is the rank of the combined digital precoder matrices of all sub-carriers. Second, we provide a simple and novel approach to reduce the number of PSs with only a negligible performance degradation. Numerical results reveal that only 20 − 40 PSs per RF chain are sufficient for practically relevant parameter settings. Finally, for the scenario where the deployed number of RF chains (N a ) is less than r t , we propose a simple user scheduling algorithm to select the best set of users in each sub-carrier. Simulation results validate theoretical expressions, and demonstrate the superiority of the proposed HB design over the existing HB designs in both flat fading and frequency selective channels.

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“…In this simulation, we examine the tightness of the upper bound rates given in (18) under equal power allocation policy. To this end, we take N = 64, N a = 16, K i = K max and K t = 8.…”

Section: ) Verification Of Theoretical Ratesmentioning

confidence: 99%

“…where K s = N f Kt NaK and E{x HB 1 imax (K s ) (E{x HB 2 imax (K g )) is the expected value of the maximum of K s (K g ) independent χ 2 N −K+1 (χ 2 Na−K+1 ) random variables. By substituting (32), (36) and (37) into the average sum rate expressions of all sub-carriers, we get (18).…”

Section: Proposed Hb Approachmentioning

confidence: 99%

On the Number of RF Chains and Phase Shifters, and Scheduling Design With Hybrid Analog–Digital Beamforming

Bogale

Haghighat

et al. 2016

IEEE Trans. Wireless Commun.

235

186

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“…Equal gain transmission is one of the analog RF beamforming schemes controlling only phase of signal with phase shifters [5,6]. Also, analog-digital hybrid beamforming techniques with the limited number of RF chains are considered to reduce the hardware complexity especially in mmWave beamforming systems [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Interference mitigation using random antenna selection in millimeter wave beamforming system

Lim

Kwon

Park

2017

J Wireless Com Network

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In multi-user beamforming systems, the inter-user interference are controlled by spatial filtering. Since the implementation of digital beamforming is difficult due to high hardware cost of large array system, the analog beamforming system with one phase shifter at each antenna element is considered with antenna selection scheme. However, the beamwidth is not sufficiently narrow to perfectly remove the interference due to limited size of antenna arrays. To mitigate the interference, we propose the random antenna selection system in millimeter wave channel. The random antenna selection expands the effective array size so that the beamwidth becomes narrow. We compare the beamwidth of conventional fixed antenna selection with random antenna selection and analyze the amount of interference for each selection scheme. Theoretical analysis and bit error rate simulation results indicate that the beamforming with random antenna selection can take advantage of large array.

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“…Antena array yang banyak digunakan untuk mengatasi masalah pathloss yang besar. Tapi, banyaknya antena yang digunakan akan menyebabkan kompleksitas yang tinggi pada sisi hardware jika menggunakan sistem digital beamforming [3,4]. Karena pada digital beamforming, jumlah RF Chain yang dibutuhkan sama dengan jumlah antena yang digunakan.…”

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“…Untuk mengurangi kompleksitas pada sisi hardware dengan menggabungkan antara analog beamforming dengan digital beamforming atau sering disebut dengan hybrid beamforming [3].…”

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Analisis Estimasi Sudut Kedatangan Menggunakan Algoritma Esprit Pada Komunikasi Millimeter-Wave Untuk Hybrid Beamforming

2018

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Beberapa tahun belakangan ini, pertumbuhan traffic komunikasi wireless semakin meningkat pesat, hal inimenyebabkan ketersedian pita frekuensi semakin menipis. Cara untuk mengatasinya adalah denganmemanfaatkan pita frekuensi tinggi yaitu pada band millimeter-wave (mm-wave). Banyaknya antena yangdigunakan pada teknologi mm-wave untuk mengatasi pathloss yang besar, akan teetapi dapatmengakibatkan kompleksitas yang tinggi pada sisi hardware jika menggunakan digital beamforming,karena satu RF chain terhubung dengan satu antena. Hybrid beamforming digunakan untuk meminimalisirpenggunaan RF chain, sehingga kompleksitas pada sisi hardware menurun. Pada penelitian kali ini, telahdilakukan analisis algoritma ESPRIT pada hybrid beamforming untuk meningkatkan performansi sistemdalam hal penentuan posisi dan lokasi dari user atau sering disebut estimasi DOA yang nantinya akandigunakan dalam proses beamforming. Dari penelitian yang dilakukan, hasilnya adalah semakin banyakantena, RF chain, dan semakin besar nilai SNR yang digunakan maka akurasi algoritma ESPRIT dalammelakukan estimasi DOA akan semakin tinggi. Sedangkan jika semakin banyak sudut datang makaakurasinya akan semakin menurun. Hasil akurasi terbaik terjadi saat menggunakan jumlah antenna 8�8dan RF chain sebanyak 6, dengan nilai ? sebesar 0,00186� dan nilai BER sebesar 5,7�10�6.

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Design of Millimeter Wave Hybrid Beamforming Systems

Cited by 26 publications

References 13 publications

On the Number of RF Chains and Phase Shifters, and Scheduling Design With Hybrid Analog–Digital Beamforming

On the Number of RF Chains and Phase Shifters, and Scheduling Design With Hybrid Analog–Digital Beamforming

Interference mitigation using random antenna selection in millimeter wave beamforming system

Analisis Estimasi Sudut Kedatangan Menggunakan Algoritma Esprit Pada Komunikasi Millimeter-Wave Untuk Hybrid Beamforming

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