On the Multiplexing Capability of mmWave Doubly-Massive MIMO Systems in LOS Environments

On the Multiplexing Capability of mmWave Doubly-Massive MIMO Systems in LOS Environments

Blog Article

This paper is concerned with the potential of spatial multiplexing in a millimeter wave (mmWave) multiple-input multiple-output (MIMO) downlink system in which the base station (BS) is equipped with multiple distributed massive antenna subarrays to serve multiple users.The paper first introduces the concept of cocktail tree for sale multiplexing gain when the number of antennas goes to infinity and the transmit power is finite.Assume that each of the user terminals is equipped with a large antenna array, the paper focuses on the simple and cost-effective analog beamforming scheme for the MIMO system operating in mmWave line-of-sight propagation environments.We obtain simple and approximate expressions for the sum rate of the system based on asymptotic analysis in the limit of the numbers of antennas at the BS and at the user terminals when the total transmit power is fixed or scaled down.The approximate expressions show that the employed analog beamforming scheme can achieve a multiplexing gain that is equal to the product of the number of subarrays at the BS and the number of users when the total transmit power is fixed, whereas the multiplexing gain decreases proportionally to such a product when the total transmit power is scaled down.

Extensive numerical results are also provided to corroborate here analytical results.