Design, optimization, and verification of an antenna array for the 60 GHz Hybrid Smart Antenna System

Çelik, Nuri; Iskander, Magdy F.

doi:10.1109/aps.2010.5561696

Cited by 3 publications

(2 citation statements)

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“…Hence, for microwave frequency bands, the proposed HB can utilize electronic switches which needs to be updated once every T c [42]. Furthermore, mmWave switches are capable of switching at a fraction of nanosecond speeds where smart switches have also been used for 60 GHz application at the receiver side in [43]. On the other hand, according to the detailed study of [40], the price and energy consumptions of switches are insignificant compared to those of PSs [40], [44].…”

Section: (B)mentioning

confidence: 99%

“…As mentioned above, the price of digitally controlled PSs is much higher than that of PSs having fixed phases. On the other hand, the digitally controlled switches can be realized like in [43] and this design can be customized to have either fully connected (partially) connected HB architecture as suggested in [33]. Due to these reasons, we believe that the architecture proposed in Fig.…”

Section: (B)mentioning

confidence: 99%

See 1 more Smart Citation

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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