Multi-User Hybrid MIMO at 60 GHz Using 16-Antenna Transmitters

Blandino, Steve; Mangraviti, Giovanni; Desset, Claude; Bourdoux, André; Wambacq, Piet; Pollin, Sofie

doi:10.1109/tcsi.2018.2866933

Cited by 30 publications

(21 citation statements)

References 17 publications

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“…We assume white noise at the mixer input and define the noise power across the input bandwidth to be N i . The pulse-skipped LO down-converts from equal noise bands around frequencies f = nf c /N , according to the conversion gains defined by the spectral components of the LO at these frequencies in (13). As noise at each input band is equal to the noise at the band around f c , we get output noise with (13) to be…”

Section: B Noise Increasementioning

confidence: 99%

See 1 more Smart Citation

True-Time-Delay Beamforming Receiver With RF Re-Sampling

Spoof

Unnikrishnan

Zahra

et al. 2020

IEEE Trans. Circuits Syst. I

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Analog domain true-time-delays (TTD) are desired in hybrid beamforming receivers with large relative bandwidths to mitigate the problem of beam squint. We propose a true-timedelay beamforming receiver architecture which enables squintfree wideband spatial filtering prior to the A/D conversion. The receiver implements true-time-delay with delayed re-sampling of the discrete-time output of a passive mixer. The receiver has the capability to extend the range of the beamforming delays from one to several carrier periods of the RF signal with pulse-skipped local oscillator (LO) signals, thereby enabling TTD beamforming with large antenna arrays. Further, a polyphase structure with parallel mixers is proposed to prevent spectral aliasing resulting from the lowered sample rate of the pulse-skipped LO signals. In addition, the maximum beamforming delay scales with the LO frequency, supporting large arrays also at low frequencies where the antenna separation set by the wavelength is large. We verify the proposed concepts with transistor-level simulation of the receiver implemented with a 28-nm CMOS process. The design achieves a squint-free beamforming for a 400 MHz RF bandwidth, and a maximum beamforming delay of three carrier time periods. The power consumption for a 3 GHz carrier frequency is 4 mW per antenna.

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Section: B Noise Increasementioning

confidence: 99%

“…On the other hand, digital beamforming does not provide spatial filtering at the ADC inputs, which limits dynamic range in the case of inband blockers [10]- [12]. Hybrid beamforming can alleviate the blocker problem by means of analog spatial filtering while retaining the computational flexibility of digital signal processing [1], [9], [13].…”

mentioning

confidence: 99%

True-Time-Delay Beamforming Receiver With RF Re-Sampling

Spoof

Unnikrishnan

Zahra

et al. 2020

IEEE Trans. Circuits Syst. I

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“…Several independent access points can be used to increase the number of transmit data streams in an area. Practical trials have shown that the system performance can be significantly boosted if joint processing takes place among the analog beamformers [12]. Such studies highlight the need for a third group of beamforming approaches, known as hybrid analog-and-digital beamformers.…”

Section: Introductionmentioning

confidence: 99%

“…However, these systems are much more expensive and complex to build. Hence, most of the existing hybrid beamforming testbeds and products are based on the subconnected approaches [9], [12], [21]- [23].…”

Section: Introductionmentioning

confidence: 99%

Developing the First mmWave Fully-Connected Hybrid Beamformer With a Large Antenna Array

et al. 2020

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Millimeter wave (mmWave) systems with effective beamforming capability play a key role in fulfilling the high data-rate demands of current and future wireless technologies. Hybrid analog-todigital beamformers have been identified as a cost-effective and energy-efficient solution towards deploying such systems. Most of the existing hybrid beamforming architectures rely on a subconnected phase shifter network with a large number of antennas. Such approaches, however, cannot fully exploit the advantages of large arrays. On the other hand, the current fully-connected beamformers accommodate only a small number of antennas, which substantially limits their beamforming capabilities. In this paper, we present a mmWave hybrid beamformer testbed with a fully-connected network of phase shifters and adjustable attenuators and a large number of antenna elements. To our knowledge, this is the first platform that connects two RF inputs from the baseband to a 16× 8 antenna array, and it operates at 26 GHz with a 2 GHz bandwidth. It provides a wide scanning range of 60 • , and the flexibility to control both the phase and the amplitude of the signals between each of the RF chains and antennas. This beamforming platform can be used in both short and long-range communications with linear equivalent isotropically radiated power (EIRP) variation between 10 dBm and 60 dBm. In this paper, we present the design, calibration procedures and evaluations of such a complex system as well as discussions on the critical factors to consider for their practical implementation. INDEX TERMS Millimeter wave, Multiple-input multiple-output, fully-connected hybrid beamforming, phased array antenna, testbed.

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“…Massive Multiple-Input Multiple-Output (Massive MIMO) is a reliable technique, which improves throughput by leveraging spatial freedom and array gain [7]. To enable multi-gigabit data rates, the integration of mm Wave bands with multi-user Massive MIMO (MU-Massive MIMO) systems are a vital TELKOMNIKA Telecommun Comput El Control  Integrating millimeter wave with hybrid precoding multiuser massive … (Mohammed Khudhur Hussein) 91 aspect [8]. Moreover, the large-scale antenna arrays for each Base Station (BS) and Mobile Station (MSs), as well as the precoding (beamforming), which contribute to the elimination of user's interference and achieve various benefits such as canceling out noise and fast fading through highly directional beamforming [9,10].…”

Section: Introductionmentioning

confidence: 99%

Integrating millimeter wave with hybrid precoding multiuser massive MIMO for 5G communication

Hussein

Khamiss

2020

TELKOMNIKA

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Nowadays, there has been growing interest in the Massive MIMO as a result of improving throughput by leveraging spatial freedom and array gain. It is equipped with millimeter wave (mm Wave) bands to resolve the high path-loss. It is known from the literature that iterated algorithms are usually used to attain the hybrid precoders to accomplish a specific optimization objective. Thus, the complexity remains high because each iteration may include singular value decomposition, the matrix inversion, and so on that motivates us to split the hybrid precoding and combining problem into sub-problems. The proposed solution is a multiuser Massive MIMO hybrid beamforming based on a convex optimization problem that is applied and solved for estimating the digital precoding to eliminate inter-user interference while using codebooks to select analog beamformers. It is apparent in the majority of cases; the proposed beamforming performance is higher than only-analog beamforming, single-user (no interference), the ZF precoding, the MMSE precoding, and the Kalman precoding where the full digital solution is a considerable as the benchmark point with different scenarios due to the reduction of user interference. Thus, there is no consideration for complicated operations such as SVD or inversion matrices as well as no need for data estimation. Our proposed solution can serve a large number of users simultaneously due to more directive gain by using numerous antennas at BS. Based on its less complexity and keeping performance, our solution can be recommended.

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Multi-User Hybrid MIMO at 60 GHz Using 16-Antenna Transmitters

Cited by 30 publications

References 17 publications

True-Time-Delay Beamforming Receiver With RF Re-Sampling

True-Time-Delay Beamforming Receiver With RF Re-Sampling

Developing the First mmWave Fully-Connected Hybrid Beamformer With a Large Antenna Array

Integrating millimeter wave with hybrid precoding multiuser massive MIMO for 5G communication

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