Optimizing Antenna Arrays for Spatial Multiplexing: Towards 6G Systems

Abstract

In this paper we discuss the design of antenna arrays to be used for multiplexing applications. In particular, we introduce a suitable performance index to analyze the effect of the antenna geometry and the distribution of users for the overall performance of Multi-User Multiple Input Multiple Output systems. By means of such performance index, antenna arrays can be designed so as to increase the number of multiplexed parallel sub-channels . Numerical results show that a proper design could allow to double the contemporary served users and the overall system throughput.

A System-Performance-Based Comparison of Sparse Regular and Irregular Antenna Arrays for Millimeter-Wave Multi-User MIMO Base Stations

“…In [15], it was shown that data streams became less correlated when the inter-element spacing was increased, regardless of the appearance of grating lobes. In [16], a similar finding was obtained, where it was shown that the overall data rate was improved when employing a sparse regular array rather than a dense one. This conclusion was also reached in [17], where in addition to regularly spaced arrays, an irregularly spaced array with 200 antenna elements was considered.…”

“…A similar conclusion was reached in [15], where it was shown that sparse arrays led to a lower probability that the streams of two users became correlated. In [16], it was shown that an improvement of the stability of the inversion in (6) occurred when the antenna elements were spaced in a sparse regular fashion. This was also in line with the result that was found here, since the outages occurred whenever the matrix HH † became singular (i.e., the matrix was unstable).…”

Analysis of Wave Propagation Models With Radio Network Planning Using Dual Polarized MIMO Antenna for 5G Base Station Applications

“…Simultaneously the network operators are maximizing their LTE network by applying LTE-Advacned for providing capacity scalability and also to make it felxibile to adpot cellular connectivity. Recently, the mobile traffic increased drastically (also by changes induced by COVID- VOLUME 4, 2016 19) which allows antennas to further optimize towards 6G systems [21]. For 5G systems to be reliable RF propagation models have to be generated to ensure standard performance which also includes path loss models [22], [23].…”

The Dynamics of the Radiated Field Near a Mobile Phone Connected to a 4G or 5G Network

“…This approach expands beam-forming and spatial filtering and allows the reuse of time and frequency resources with a low level of user interference. Optimization of the antenna array to obtain maximum performance in Line-of-Sight (LoS) propagation condition was explored in [21], introducing a predictor factor for beam-forming losses and a way to use it in MU-MIMO systems. Moreover, grating lobes did not have a negative impact in MU-MIMO systems, while using larger inter-element spacings can be advantageous.…”