MSE-Based Hybrid RF/Baseband Processing for Millimeter-Wave Communication Systems in MIMO Interference Channels

Kim, Minhyun; Lee, Yong H.

doi:10.1109/tvt.2014.2346400

Cited by 107 publications

(85 citation statements)

References 13 publications

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“…These weights are then transferred to the analog combiner hardware using a serial peripheral interface (SPI) protocol, which is used to control the dedicated analog combiner board. 4) Analog combiner board: The analog combiner board is a self-designed dedicated hardware, which realizes a controllable analog combiner network, and can serve as any of the common combiner architectures, e.g., phase shifter networks, switching networks [9] and DFT beamforming [17]. The designed analog combiner supports two different types of input signals: one is passband signals in the frequency band up to 4.5 GHz and another is BB signals each with a 125 MHz maximum bandwidth.…”

Section: B Prototype Physical Entitiesmentioning

confidence: 99%

RF Chain Reduction for MIMO Systems: A Hardware Prototype

Gong

Shlezinger

Ioushua

et al. 2020

IEEE Systems Journal

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RF chain circuits play a major role in digital receiver architectures, allowing passband communication signals to be processed in baseband. When operating at high frequencies, these circuits tend to be costly. This increased cost imposes a major limitation on future multiple-input multiple-output (MIMO) communication technologies. A common approach to mitigate the increased cost is to utilize hybrid architectures, in which the received signal is combined in analog into a lower dimension, thus reducing the number of RF chains. In this work we present a hardware prototype implementing analog combining for RF chain reduction. The prototype consists of a specially designed configurable combining board as well as a dedicated experimental setup. Our hardware prototype allows to evaluate the effect of analog combining in MIMO systems using actual communication signals. The experimental study, which focuses on channel estimation accuracy in MIMO channels, demonstrates that using the proposed prototype, the achievable channel estimation performance is within a small gap in a statistical sense from that obtained using a costly receiver in which each antenna is connected to a dedicated RF chain. Furthermore, in the considered scenarios, this gap becomes negligible when the reduction rate, i.e., the ratio of the number of RF chains to the number of antennas, is above 62.5%.

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Section: B Prototype Physical Entitiesmentioning

confidence: 99%

RF Chain Reduction for MIMO Systems: A Hardware Prototype

Gong

Shlezinger

Ioushua

et al. 2020

IEEE Systems Journal

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“…In these simulations we consider a simple Rician-fading channel model, which allows to easily control the compressibility of the CSI in the angular domain via the Rician K-factor. In Section 6.3, we then utilize the more realistic QUADRIGA channel model [76] to compare the proposed leakage-bounded angular precoding methods to the interference-aware precoding methods summarized in Section 5.2 4 . We first of all evaluate the compressibility of the channel realizations obtained from QUADRIGA in the angular domain.…”

Section: Simulationsmentioning

confidence: 99%

“…3 We investigate a related max-min problem that accounts for uncertainty in the signal direction in [39]; it can only be approximately solved via SDR. 4 The simulation results were generated using QuaDRiGa Version 1.4.8-571. 5 Notice, the antenna boresight direction is (φ, θ) = (0 • , 90 • ).…”

Section: Endnotesmentioning

confidence: 99%

“…Currently, most implementation proposals of FD-MIMO transceivers are based on hybrid architectures, where part of the signal processing is performed in base band and part in the analog radio frequency (RF) domain in order to limit the number of required RF chains. This approach is especially important in the millimeter wave band, where hardware complexity is a limiting factor [4][5][6][7][8]. When designing hybrid precoding systems, several challenges need to be addressed [9][10][11]: the design freedom of RF precoders is commonly restricted by hardware limitations, such as discrete angular resolution and constant modulus of the phase-shifting elements, as well as partial connectivity of the phase-shift network to limit insertion loss.…”

Section: Introductionmentioning

confidence: 99%

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Robust full-dimension MIMO transmission based on limited feedback angular-domain CSIT

Schwarz

2018

J Wireless Com Network

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In this paper, we propose robust multi-user beamforming and precoding techniques for full-dimension MIMO transmission based on limited feedback. We propose to employ an over-complete basis decomposition in the angular domain to approximate the channel matrices as sums of few dominant specular components, facilitating efficient channel state information (CSI) quantization at the users. The selected expansion vectors of such a sparse approximation, parametrized by azimuth and elevation angles, are relatively robust with respect to channel estimation errors as well as channel variations over time. Based on this CSI feedback, we propose incoherent beamforming/precoding methods that make use only of the azimuth and elevation angles as well as the norm of the expansion coefficients and do not rely on coherent multipath interference to eliminate inter-user interference. Our optimization aims at maximizing the signal power or the achievable rate of a user, while limiting the amount of interference leakage caused to other users. To further improve robustness, we account for uncertainty in the angular channel decomposition in the proposed precoder optimization.

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“…While (9) describe the power constraint with ρ k is the transmitted power of the kth relay. Jointly optimizing the problem in (7) with the constrains in (8) is known to be intractable [10], [23]. A near optimal solution is suggested by firstly decoupling the relay and destination, then minimize the Frobenius norm of the difference between the hybrid processors and the unconstrained processors G u,k , W u .…”

Section: B Channel Modelmentioning

confidence: 99%

Hybrid Beamformers Design for MIMO Relay Networks in Millimeter Wave

Abbas

Hamdi

2017

2017 IEEE Wireless Communications and Networking Conference (WCNC)

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Abstract-One of the challenges for the wireless networks is meeting the high demand for cellular data. One approach is to utilize the wide bandwidth provided by the millimeter wave (mmWave) frequencies. In this work, we propose using multiple relays to link two points in the outdoor mmWave environments. We use hybrid (analog and digital) beamformers in the Amplify-and-Forward (AF) half duplex relays to overcome the propagation losses usually arise in such environments. The design is based on the the widely known Orthogonal Match Pursuit (OMP) algorithm. Results show significant performance improvement for multiple relay links as compared to links with single relay. The results also discuss the influence of the array size and the number of RF chains on the overall performance.

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MSE-Based Hybrid RF/Baseband Processing for Millimeter-Wave Communication Systems in MIMO Interference Channels

Cited by 107 publications

References 13 publications

RF Chain Reduction for MIMO Systems: A Hardware Prototype

RF Chain Reduction for MIMO Systems: A Hardware Prototype

Robust full-dimension MIMO transmission based on limited feedback angular-domain CSIT

Hybrid Beamformers Design for MIMO Relay Networks in Millimeter Wave

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