Power Scaling of Uplink Massive MIMO Systems With Arbitrary-Rank Channel Means
TLDR
It is found that regardless of the Ricean K-factor, in the case of perfect CSI, the approximations converge to the same constant value as the exact results, as the number of base station antennas grows large, while the transmit power of each user can be scaled down proportionally to 1/M.Abstract:
This paper investigates the uplink achievable rates of massive multiple-input multiple-output (MIMO) antenna systems in Ricean fading channels, using maximal-ratio combining (MRC) and zero-forcing (ZF) receivers, assuming perfect and imperfect channel state information (CSI). In contrast to previous relevant works, the fast fading MIMO channel matrix is assumed to have an arbitrary-rank deterministic component as well as a Rayleigh-distributed random component. We derive tractable expressions for the achievable uplink rate in the large-antenna limit, along with approximating results that hold for any finite number of antennas. Based on these analytical results, we obtain the scaling law that the users' transmit power should satisfy, while maintaining a desirable quality of service. In particular, it is found that regardless of the Ricean K-factor, in the case of perfect CSI, the approximations converge to the same constant value as the exact results, as the number of base station antennas,, grows large, while the transmit power of each user can be scaled down proportionally to. If CSI is estimated with uncertainty, the same result holds true but only when the Ricean K-factor is non-zero. Otherwise, if the channel experiences Rayleigh fading, we can only cut the transmit power of each user proportionally to 1 root M. In addition, we show that with an increasing Ricean K-factor, the uplink rates will converge to fixed values for both MRC and ZF receivers.read more
Citations
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Uplink Achievable Rate for Massive MIMO Systems With Low-Resolution ADC
TL;DR: An approximate analytical expression is derived for the uplink achievable rate of a massive multiinput multioutput (MIMO) antenna system when finite precision analog-digital converters (ADCs) and the common maximal-ratio combining technique are used at the receivers.
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On the Spectral Efficiency of Massive MIMO Systems With Low-Resolution ADCs
TL;DR: This letter derives tractable and exact approximation expressions of the uplink SE of massive MIMO with the typical maximal-ratio combining (MRC) receivers and reveals that the use of low-cost and low-resolution ADCs can still achieve satisfying SE in massive M IMO systems.
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Residual Transceiver Hardware Impairments on Cooperative NOMA Networks
TL;DR: It is proved that the OP at high signal-to-noise ratios (SNRs) is a function of threshold, distortion noises, estimation errors and fading parameters, which results in 0 diversity order, and it is demonstrated that the outage performance of cooperative NOMA scenario exceeds the non-cooperative NomA scenario in the high SNR regime.
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No Downlink Pilots Are Needed in TDD Massive MIMO
Hien Quoc Ngo,Erik G. Larsson +1 more
TL;DR: In this article, a blind algorithm is proposed to estimate the effective channel gain at each user, that does not require any downlink pilots, for the massive MIMO downlink with zero-forcing processing and time division duplex operation.
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Performance Analysis of Mixed-ADC Massive MIMO Systems over Rician Fading Channels
TL;DR: This work investigates the performance of mixed-ADC massive MIMO systems over the Rician fading channel, which is more general for the 5G scenarios like Internet of Things, and reveals the tradeoff between the achievable rate and the energy efficiency.
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Digital communications
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