Journal ArticleDOI
Noncooperative Cellular Wireless with Unlimited Numbers of Base Station Antennas
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TLDR
A cellular base station serves a multiplicity of single-antenna terminals over the same time-frequency interval and a complete multi-cellular analysis yields a number of mathematically exact conclusions and points to a desirable direction towards which cellular wireless could evolve.Abstract:
A cellular base station serves a multiplicity of single-antenna terminals over the same time-frequency interval. Time-division duplex operation combined with reverse-link pilots enables the base station to estimate the reciprocal forward- and reverse-link channels. The conjugate-transpose of the channel estimates are used as a linear precoder and combiner respectively on the forward and reverse links. Propagation, unknown to both terminals and base station, comprises fast fading, log-normal shadow fading, and geometric attenuation. In the limit of an infinite number of antennas a complete multi-cellular analysis, which accounts for inter-cellular interference and the overhead and errors associated with channel-state information, yields a number of mathematically exact conclusions and points to a desirable direction towards which cellular wireless could evolve. In particular the effects of uncorrelated noise and fast fading vanish, throughput and the number of terminals are independent of the size of the cells, spectral efficiency is independent of bandwidth, and the required transmitted energy per bit vanishes. The only remaining impairment is inter-cellular interference caused by re-use of the pilot sequences in other cells (pilot contamination) which does not vanish with unlimited number of antennas.read more
Citations
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Journal ArticleDOI
Downlink Precoding With Mixed Statistical and Imperfect Instantaneous CSI for Massive MIMO Systems
TL;DR: This paper theoretically analyze the impact of the mutual interference between the two types of users and proposes an extended zero forcing and an extended maximum ratio transmission precoding methods to minimize the total transmit power of base station and to maximize the received signal power of users.
Journal ArticleDOI
On the Multi-User, Multi-Cell Massive Spatial Modulation Uplink: How Many Antennas for Each User?
TL;DR: This paper study the achievable uplink spectral efficiency (SE) of a multi-cell massive SM-MIMO system, and derive closed-form expressions to asymptotically lower-bound the SE yielded by two linear BS combining schemes, including maximum ratio combining and zero forcing combining.
Journal ArticleDOI
Channel Reciprocity Calibration in TDD Hybrid Beamforming Massive MIMO Systems
Xiwen Jiang,Florian Kaltenberger +1 more
TL;DR: This paper focuses on time division duplex systems with hybrid beamforming structure and proposes a reciprocity calibration scheme that allows to acquire full CSIT, and different from existing CSIT acquisition methods, does not require any assumption on the channel model and can estimate fullCSIT.
Journal ArticleDOI
Game-Theoretic Approaches for Energy Cooperation in Energy Harvesting Small Cell Networks
TL;DR: Two novel online approaches for enabling energy trading in multitier cellular networks with noncooperative energy-harvesting base stations (BSs) are proposed and the amount of information exchanged in the network to enable BSs to trade energy is reduced in the centralized algorithm compared to the decentralized algorithm at the expense of using a control center.
Proceedings ArticleDOI
Location-based channel estimation and pilot assignment for massive MIMO systems
TL;DR: The proposed location-based channel estimation algorithm for massive multi-input multi-output (MIMO) systems can reduce the inter-cell interference caused by the reuse of the pilot sequence and thus improves the overall system performance significantly.
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Duality, achievable rates, and sum-rate capacity of Gaussian MIMO broadcast channels
TL;DR: It is shown that the dirty paper achievable region achieves the sum-rate capacity of the MIMO BC by establishing that the maximum sum rate of this region equals an upper bound on the sum rate.