Beamforming Based on Specular Component for Massive MIMO Systems in Ricean Fading

Yue, Dian-Wu; Zhang, Yan; Jia, Yanan

doi:10.1109/lwc.2015.2396071

Cited by 36 publications

(20 citation statements)

References 9 publications

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“…This means that P = SNR dg N s L/(N r N t ) for a given designed SNR SNR dg . In fact, there exists a power scaling law for mmWave communications which states that the data transmit power P can be scaled down proportionally to 1/(N r N t ) in order to maintain a desirable BER performance [35].…”

Section: Simulation Results and Discussionmentioning

confidence: 99%

Diversity gain of millimeter-wave massive MIMO systems with distributed antenna arrays

Yue

Nguyen

2019

J Wireless Com Network

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This paper is concerned with diversity gain analysis for millimeter-wave (mmWave) massive MIMO systems employing distributed antenna subarray architecture. First, for a single-user mmWave system in which the transmitter and receiver consist of K t and K r subarrays, respectively, a diversity gain theorem is established when the numbers of subarray antennas go to infinity. Specifically, assuming that all subchannels have the same number of propagation paths L, the theorem states that by employing such a distributed antenna subarray architecture, a diversity gain of K r K t L − N s + 1 can be achieved, where N s represents the number of data streams. This result means that compared to the co-located antenna architecture, using the distributed antenna subarray architecture can scale up the diversity gain proportionally to K r K t . The analysis of diversity gain is then extended to the multiuser scenario as well as the scenario with conventional partially connected radio-frequency structure in the literature. Simulation results obtained with the hybrid analog/digital processing corroborate the analysis results and show that the distributed subarray architecture indeed yields a significantly better diversity performance than the co-located antenna architectures. IntroductionMillimeter-wave (mmWave) communication has recently gained considerable attention as a candidate technology for 5G mobile communication systems and beyond [1][2][3][4][5]. The main reason for this is the availability of vast spectrum in the mmWave band that is very attractive for high data rate communications. However, compared to communication systems operating at lower microwave frequencies (such as those currently used for 4G mobile communications), propagation loss in mmWave frequencies is much higher, in orders of magnitude. Fortunately, given the much smaller carrier wavelengths, mmWave communication systems can make use of compact massive antenna arrays to compensate for the increased propagation loss.Nevertheless, the large-scale antenna arrays together with high cost and large power consumption of the mixed analog/digital signal components make it difficult to equip a separate radio-frequency (RF) chain for each

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Section: Simulation Results and Discussionmentioning

confidence: 99%

Diversity gain of millimeter-wave massive MIMO systems with distributed antenna arrays

Yue

Nguyen

2019

J Wireless Com Network

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“…Due to the fact that the channel state information (CSI) needs to be acquired by channel estimation which will be a heavy overhead, a linear transmission only based on the LOS component in Rician fading environment was proposed in [31]- [33], while scattered component is omitted.…”

Section: Introductionmentioning

confidence: 99%

Downlink Transmission of Multicell Distributed Massive MIMO With Pilot Contamination Under Rician Fading

2020

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In this paper, we investigate the spectral efficiency (SE) of a multicell downlink (DL) distributed massive MIMO (DM-MIMO) system with pilot contamination operating over Rician fading channels in which each remote access unit (RAU) is equipped with a large number of distributed massive antenna arrays, while each user has a single antenna. In contrast to many previous works about DM-MIMO systems, the channel between users and the RAUs antennas in the same cell is modeled to be Rician fading, which is general for the 5G scenarios like Internet of Things. We explore maximum-ratio transmission (MRT) and line-of-sight (LOS) component-based equal-gain transmission (EGT) under imperfect channel state information. The tractable, but accurate closed-form expressions for the lower bounds of the achievable rate are derived for the MRT and the LOS component-based EGT over Rician fading channels in the DM-MIMO systems. Based on the obtained closed-form expressions, various power scaling laws concerning DL data transmit power and pilot transmit power are analyzed in detail. Numerical results are used to corroborate that these approximations are asymptotically tight, but accurate for systems. They also show that employing the LOS component-based EGT processing is more preferable than the MRT processing for DM-MIMO systems in conditions having a large number of RAU antennas and stronger LOS scenarios. Finally, the simulation results further show that when the number of all antennas for RAUs is fixed, the better SE performance can be obtained with more RAUs. INDEX TERMS Distributed Massive MIMO (DM-MIMO), Rician fading, Line-of-sight (LOS) component, power scaling law.

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“…However, the channel estimation will result in not only heavy overhead but also pilot contamination in multi-cells, which will become a serious problem [2,8]. For a point to point massive MIMO system in Ricean fading, to reduce the heavy overhead to estimate the CSI, we investigated a scheme with equal gain transmission /equal gain combining (EGT/EGC), which is only based on the line-of-sight (LOS) component (or say specular component) and has low hardware complexity [9]. It was showed that, with this scheme, the ergodic achievable rate can converge to that of the corresponding MRT/MRC based on the perfect CSI as the two numbers of antennas at the transmitter and receiver go to infinity.…”

Section: Introductionmentioning

confidence: 99%

LOS-Based Equal Gain Transmission and Combining in General Frequency-Selective Ricean Massive MIMO Channels

2019

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In general frequency-selective Ricean fading environments with doubly-ended spatial correlation, this paper investigates the spectral efficiency of a broadband massive multiple-input multiple-output (MIMO) system. In particular, in order to reduce overhead of channel estimation effectively, it proposes a scheme of equal gain transmission and combining, which is only based on line- of-sight (LOS) component and has low hardware complexity. With the scheme, several interesting transmit power scaling properties without and with spatial correlation are derived when the number of antennas at the transmitter or the number of antennas at the receiver grows in an unlimited way. Furthermore, the asymptotical rate analysis is extended to the cooperative relaying scenarios with decode-and-forward and amplify-and-forward protocols, respectively, and then two novel power scaling laws are given.

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Beamforming Based on Specular Component for Massive MIMO Systems in Ricean Fading

Cited by 36 publications

References 9 publications

Diversity gain of millimeter-wave massive MIMO systems with distributed antenna arrays

Diversity gain of millimeter-wave massive MIMO systems with distributed antenna arrays

Downlink Transmission of Multicell Distributed Massive MIMO With Pilot Contamination Under Rician Fading

LOS-Based Equal Gain Transmission and Combining in General Frequency-Selective Ricean Massive MIMO Channels

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