In this paper, two-stage BP detection is proposed for overloaded MIMO. In the two-stage BP detection scheme, the BP with MMSE pre-cancellation algorithm followed by the normal BP detection is applied. In overloaded MIMO systems, the loops in a factor graph degrade the demodulation performance of BP detection. MMSE pre-cancellation reduces the number of connections or coefficient values in the factor graph and improves the convergence characteristics of posteriori probabilities. Numerical results obtained through computer simulation have shown that the BERs of the proposed two-stage BP detection are about 1.0-1.5dB better than those of the conventional BP with MMSE pre-cancellation when the MMSE block size is four and the number of MMSE blocks is one.
|Title of host publication
|2021 IEEE 94th Vehicular Technology Conference, VTC 2021-Fall - Proceedings
|Institute of Electrical and Electronics Engineers Inc.
|Published - 2021
|94th IEEE Vehicular Technology Conference, VTC 2021-Fall - Virtual, Online, United States
Duration: 2021 Sept 27 → 2021 Sept 30
|IEEE Vehicular Technology Conference
|94th IEEE Vehicular Technology Conference, VTC 2021-Fall
|21/9/27 → 21/9/30
ASJC Scopus subject areas
- Computer Science Applications
- Electrical and Electronic Engineering
- Applied Mathematics