In massive Multiple-Input Multiple-Output (MIMO) systems, the high power consumption of radio frequency (RF) chains is unbearable. Low-resolution analog-to-digital converters (ADCs) serve as a potential method, but they may lead to performance degradation. To get a tradeoff, mixed- ADC architecture is considered as a promising approach to balance performance and power consumption. In this paper, an optimal bits allocation scheme is proposed for uplink massive MIMO systems with mixed ADCs. Based on the derivation of closed-form expressions for achievable sum rate and energy efficiency (EE), optimization problems are formulated to reflect the relationship between system performance and different ADC resolutions on antennas with total bits constraint. Moreover, a hierarchical traversal algorithm is further provided to reduce the computation complexity. Numerical results validate that the proposed bits allocation scheme shows significant performance gain compared with other schemes. Furthermore, it has been proved feasible for practical massive MIMO systems due to its much lower complexity.
Uplink Performance Analysis and Bits Allocation for Massive MIMO Systems with Mixed ADCs
2024-06-24
486518 byte
Conference paper
Electronic Resource
English