Limited Feedback Hybrid Beamforming Based on Dual Polarized Array Antenna

Sung, L. S. Ma; Park, Dae-Hee; Cho, Dong-Ho

doi:10.1109/lcomm.2018.2817190

Cited by 9 publications

(14 citation statements)

References 9 publications

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“…A matrix decomposition method that could convert any existing precoder/combining design for the full digital scheme into an analog-digital precoder/combining for the hybrid architecture was addressed in [16]. Approaches for narrowband multi-user systems were also considered in [17][18][19][20][21][22]. A limited feedback hybrid analog-digital precoding/combining scheme for multi-user systems was addressed in [17].…”

Section: Previous Work On Fully Connected Architecturesmentioning

confidence: 99%

“…In [21], an iterative precoder and combiner design was proposed by exploiting the duality of the uplink and downlink multi-user MIMO channels. In [22], a hybrid beamforming system based on a dual polarized array antenna was proposed for single user systems. The hybrid architecture for either single or multi-user the mmW mMIMO wideband systems was considered in [23][24][25].…”

Section: Previous Work On Fully Connected Architecturesmentioning

confidence: 99%

“…where N rx represents the number of receive antennas, ρ PL represents the path-loss between the transmitter and the receiver, α u q,l is the complex path gain of the lth ray in the qth scattering cluster, and a raised-cosine filter is adopted for the pulse shaping function p rc (.) for T S -spaced signaling, as in [22]. The qth cluster has a time delay τ u q , angles of departure θ u q , and arrival φ u q .…”

Section: Channel Model Descriptionmentioning

confidence: 99%

“…Each ray l from qth cluster has a relative time delay τ u q,l , relative angles of departure ϑ u q,l , and arrival ϕ u q,l . The paths delay is uniformly distributed in [0, DT s ] where D denotes the length of the CP, and the angles follow the random distribution mentioned in [22], such that E[…”

Section: Channel Model Descriptionmentioning

confidence: 99%

“…The q th cluster has a time delay u q τ , angles of departure u q θ , and arrival u q φ . Each ray l from qth cluster has a relative time delay , u q l τ , relative angles of departure , paths delay is uniformly distributed in [ ] 0, s DT where D denotes the length of the CP, and the anglesfollow the random distribution mentioned in[22], such that receive and transmit array response vectors, respectively.…”

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confidence: 99%

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Multi-User Linear Equalizer and Precoder Scheme for Hybrid Sub-Connected Wideband Systems

et al. 2019

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Millimeter waves and massive multiple-input multiple output (MIMO) are two promising key technologies to achieve the high demands of data rate for the future mobile communication generation. Due to hardware limitations, these systems employ hybrid analog–digital architectures. Nonetheless, most of the works developed for hybrid architectures focus on narrowband channels, and it is expected that millimeter waves be wideband. Moreover, it is more feasible to have a sub-connected architecture than a fully connected one, due to the hardware constraints. Therefore, the aim of this paper is to design a sub-connected hybrid analog–digital multi-user linear equalizer combined with an analog precoder to efficiently remove the multi-user interference. We consider low complexity user terminals employing pure analog precoders, computed with the knowledge of a quantized version of the average angles of departure of each cluster. At the base station, the hybrid multi-user linear equalizer is optimized by using the bit-error-rate (BER) as a metric over all the subcarriers. The analog domain hardware constraints, together with the assumption of a flat analog equalizer over the subcarriers, considerably increase the complexity of the corresponding optimization problem. To simplify the problem at hand, the merit function is first upper bounded, and by leveraging the specific properties of the resulting problem, we show that the analog equalizer may be computed iteratively over the radio frequency (RF) chains by assigning the users in an interleaved fashion to the RF chains. The proposed hybrid sub-connected scheme is compared with a fully connected counterpart.

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Section: Previous Work On Fully Connected Architecturesmentioning

confidence: 99%

Section: Previous Work On Fully Connected Architecturesmentioning

confidence: 99%

Section: Channel Model Descriptionmentioning

confidence: 99%

Section: Channel Model Descriptionmentioning

confidence: 99%

mentioning

confidence: 99%

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Multi-User Linear Equalizer and Precoder Scheme for Hybrid Sub-Connected Wideband Systems

et al. 2019

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Millimetre wave frequency band as a candidate spectrum for 5G network architecture: A survey

Al-Falahy

Alani

2019

Physical Communication

106

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In order to meet the huge growth in global mobile data traffic in 2020 and beyond, the development of the 5 th Generation (5G) system is required as the current 4G system is expected to fall short of the provision needed for such growth. 5G is anticipated to use a higher carrier frequency in the millimetre wave (mm-wave) band, within the 20 to 90 GHz, due to the availability of a vast amount of unexploited bandwidth. It is a revolutionary step to use these bands because of their different propagation characteristics, severe atmospheric attenuation, and hardware constraints. In this paper, we carry out a survey of 5G research contributions and proposed design architectures based on mm-wave communications. We present and discuss the use of mm-wave as indoor and outdoor mobile access, as a wireless backhaul solution, and as a key enabler for higher order sectorisation. Wireless standards such as IEE802.11ad, which are operating in mm-wave band have been presented. These standards have been designed for short range, ultra high data throughput systemS in the 60GHz band. Furthermore, this survey provides new insights regarding relevant and open issues in adopting mm-wave for 5G networks. This includes increased handoff rate and interference in Ultra-Dense Network (UDN), waveform consideration with higher spectral efficiency, and supporting spatial multiplexing in mm-wave line of site. This survey also introduces a distributed base station architecture in mm-wave as an approach to address increased handoff rate in UDN, and to provide an alternative way for network densification in a time and cost effective manner.

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Hybrid Multi-User Equalizer for Massive MIMO Millimeter-Wave Dynamic Subconnected Architecture

et al. 2019

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This paper proposes a hybrid multiuser equalizer for the uplink of broadband millimeterwave massive multiple input/multiple output (MIMO) systems with dynamic subarray antennas. Hybrid subconnected architectures are more suitable for practical applications since the number of required phase shifters is lower than in fully connected architectures. We consider a set of only analog precoded users transmitting to a base station and sharing the same radio resources. At the receiver end, the hybrid multiuser equalizer is designed by minimizing the sum of the mean square error (MSE) of all subcarriers, considering a two-step approach. In the first step, the digital part is iteratively computed as a function of the analog part. It is considered that the digital equalizers are computed on a per subcarrier basis, while the analog equalizer is constant over the subcarriers and the digital iterations due to hardware constraints. In the second step, the analog equalizer with dynamic antenna mapping is derived to connect the best set of antennas to each radio frequency (RF) chain. For each subset of antennas, one antenna and a quantized phase shifter are selected at a time, taking into account all previously selected antennas. The results show that the proposed hybrid dynamic two-step equalizer achieves a performance close to the fully connected counterpart, although it is less complex in terms of hardware and signal processing requirements. INDEX TERMS Multiuser equalizer, hybrid dynamic architecture, massive multiple input/multiple output (MIMO), millimeter-wave communications.

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Limited Feedback Hybrid Beamforming Based on Dual Polarized Array Antenna

Cited by 9 publications

References 9 publications

Multi-User Linear Equalizer and Precoder Scheme for Hybrid Sub-Connected Wideband Systems

Multi-User Linear Equalizer and Precoder Scheme for Hybrid Sub-Connected Wideband Systems

Millimetre wave frequency band as a candidate spectrum for 5G network architecture: A survey

Hybrid Multi-User Equalizer for Massive MIMO Millimeter-Wave Dynamic Subconnected Architecture

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