| 1. |
- Bertilsson, Erik, 1990-, et al.
(författare)
-
Low-Latency Parallel Hermitian Positive-Definite Matrix Inversion for Massive MIMO
- 2021
-
Ingår i: 2021 IEEE WORKSHOP ON SIGNAL PROCESSING SYSTEMS (SIPS 2021). - : Institute of Electrical and Electronics Engineers (IEEE). - 9781665401449 - 9781665401456 ; , s. 23-28
-
Konferensbidrag (refereegranskat)abstract
- In this work, the effect of latency for three different positive definite matrix inversion algorithms when implemented on parallel and pipelined processing elements is considered. The work is motivated by the fact that in a massive MIMO system, matrix inversion needs to be performed between estimating the channels and producing the transmitted downlink signal, which means that the latency of the matrix inversion has a significant impact on the system performance. It is shown that, despite the algorithms having different complexity, all three algorithms can have the lowest latency for different number of processing elements and pipeline levels. Especially, in systems with many processing elements, the algorithm with the highest complexity has the lowest latency.
|
|
| 2. |
- Mazloum, Nafiseh, et al.
(författare)
-
Initial Analysis of Dynamic Panel Activation for Large Intelligent Surfaces
- 2021
-
Ingår i: Proceedings - 2021 IEEE Workshop on Signal Processing Systems, SiPS 2021. - 1520-6130. - 9781665401449 ; 2021-October, s. 18-22
-
Konferensbidrag (refereegranskat)abstract
- Large intelligent surfaces (LIS) have the potential to be the beyond-massive-MIMO solution, even further improving spectral efficiency, coverage, reliability and other performance measures. They also open up for entirely new services, such as precise localization, environment sensing, and wireless energy transfer. By constructing larger surfaces as a grid of panels, we can activate and deactivate these panels depending on their individual contributions to an overall service-defined performance measure and thereby use as little resources as possible. In this paper, we take initial steps in this direction by analyzing how surfaces built as grids of panels, of which only a fraction are activated, compare. We present three types of results, for an example environment: i) received power gain when allowing dynamic activation over a large surface rather than a single central located panel, ii) the required number of activated antenna elements to reach a minimum received power for different panel sizes, and iii) the locations of activated surface areas.
|
|
