Impact of Relay Cooperation on the Performance of Large-scale Multipair Two-way Relay Networks
Muris Sarajlic, Liang Liu, Fredrik Rusek, Farhana Sheikh, Ove Edfors

TL;DR
This paper analyzes how relay cooperation affects the sumrate in large-scale multipair two-way relay networks, showing that multiple smaller groups can achieve similar performance to a single large group, thus optimizing resource use.
Contribution
It derives a lower bound for the ergodic sumrate considering relay group size and demonstrates that smaller groups can replace large ones without significant performance loss.
Findings
Sumrate is independent of group size when groups are large.
Multiple smaller relay groups can match the performance of a single large group.
Relay cooperation is more resource-efficient with several smaller groups.
Abstract
We consider a multipair two-way relay communication network, where pairs of user devices exchange information via a relay system. The communication between users employs time division duplex, with all users transmitting simultaneously to relays in one time slot and relays sending the processed information to all users in the next time slot. The relay system consists of a large number of single antenna units that can form groups. Within each group, relays exchange channel state information (CSI), signals received in the uplink and signals intended for downlink transmission. On the other hand, per-group CSI and uplink/downlink signals (data) are not exchanged between groups, which perform the data processing completely independently. Assuming that the groups perform zero-forcing in both uplink and downlink, we derive a lower bound for the ergodic sumrate of the described system as a…
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Taxonomy
TopicsCooperative Communication and Network Coding · Advanced MIMO Systems Optimization · Wireless Communication Security Techniques
