Energy-Efficient Power and LNA Control for Wireless Multi-Channel Communication

Zhao, Pengkai; Bhattacharjee, Supratik; Park, Jong Hyeon; Subrahmanya, P.; Banister, B.A.; Narasimha, M.

doi:10.1109/wcnc.2017.7925813

Cited by 3 publications

(12 citation statements)

References 8 publications

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“…To simulate a frequency-selective propagation environment, it is assumed that the transmit signal from transmitter k is received from V scattering clusters, each located at the position (x kv , y kv ). Then, instead of the expression in (26), the received signal is given by…”

Section: Frequency-selective Channelsmentioning

confidence: 99%

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Impact of Spatial Filtering on Distortion From Low-Noise Amplifiers in Massive MIMO Base Stations

Mollén

Gustavsson

Eriksson

et al. 2018

IEEE Trans. Commun.

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In massive MIMO base stations, power consumption and cost of the low-noise amplifiers (LNAs) can be substantial because of the many antennas. We investigate the feasibility of inexpensive, power efficient LNAs, which inherently are less linear. A polynomial model is used to characterize the nonlinear LNAs and to derive the second-order statistics and spatial correlation of the distortion. We show that, with spatial matched filtering (maximum-ratio combining) at the receiver, some distortion terms combine coherently, and that the SINR of the symbol estimates therefore is limited by the linearity of the LNAs. Furthermore, it is studied how the power from a blocker in the adjacent frequency band leaks into the main band and creates distortion. The distortion term that scales cubically with the power received from the blocker has a spatial correlation that can be filtered out by spatial processing and only the coherent term that scales quadratically with the power remains. When the blocker is in free-space line-of-sight and the LNAs are identical, this quadratic term has the same spatial direction as the desired signal, and hence cannot be removed by linear receiver processing.

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Section: Frequency-selective Channelsmentioning

confidence: 99%

“…The work in [26], [27] proposed a hardware architecture for the receiver in a massive MIMO base station that only employs a single LNA for the whole array. That work, however, used a simplistic hardware model that did not take nonlinear effects into account.…”

Section: B Other Related Workmentioning

confidence: 99%

Impact of Spatial Filtering on Distortion From Low-Noise Amplifiers in Massive MIMO Base Stations

Mollén

Gustavsson

Eriksson

et al. 2018

IEEE Trans. Commun.

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“…Finally, the energy efficiency is defined as the ratio between spectral efficiency and consumed power of the system [25]. Note that in our model, and also in other literature [13], [20], the overall consumed power includes the circuit power and the transmit power. Therefore, the energy efficiency defined here is a system-level metric rather than that of only the tranceivers.…”

Section: System Modelmentioning

confidence: 99%

“…In this paper, we follow the same design philosophy and study an attractive low-complexity MIMO receiver structure, where a single low-noise amplifier (LNA) [13] is used to cover all receive antennas at the base station (BS). This architecture has the benefits of reduced implementation cost and lower power consumption, compared to the separate LNA approach where each RF chain uses an independent LNA for gain control.…”

Section: Introductionmentioning

confidence: 99%

“…This architecture has the benefits of reduced implementation cost and lower power consumption, compared to the separate LNA approach where each RF chain uses an independent LNA for gain control. The shared-LNA structure is previously used by multichannel communications [13] where signals from different channels are non-overlapping in the frequency domain. This feature mostly relies on LNA's wider bandwidth and more relaxed saturation point compared to other RF components like ADC.…”

Section: Introductionmentioning

confidence: 99%

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On Energy Efficient Uplink Multi-User MIMO with Shared LNA Control

Yu¹,

Shen²,

Zhao³

et al. 2017

Preprint

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Implementation cost and power consumption are two important considerations in modern wireless communications, particularly in large-scale multi-antenna systems where the number of individual radio-frequency (RF) chains may be significantly larger than before. In this work, we propose to deploy a single low-noise amplifier (LNA) on the uplink multipleinput-multiple-output (MIMO) receiver to cover all antennas. This architecture, although favorable from the perspective of cost and power consumption, introduces challenges in the LNA gain control and user transmit power control. We formulate an energy efficiency maximization problem under practical system constraints, and prove that it is a constrained quasi-concave optimization problem. We then propose an efficient algorithm, Bisection -Gradient Assisted Interior Point (B-GAIP), that solves this optimization problem. The optimality, convergence and complexity of B-GAIP are analyzed, and further corroborated via numerical simulations. In particular, the performance loss due to using a shared LNA as opposed to separate LNAs in each RF chain, when using B-GAIP to determine the LNA gain and user transmit power, is very small in both centralized and distributed MIMO systems.

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