Distributed Multiuser Two-Way AF Relaying Systems under Jamming Environment

A distributed multiuser two-way amplify-and-forward (AF) wireless relay strategy consisting of 2M sources (or 2M destinations) and N relays all equipped with single antenna per communication node is studied in this paper. All sources act as both sources and destinations with a self-interference cancelation process at the 2M destinations. The main objective is to design the closed-form of minimum mean square error (MMSE)-based relay amplifying matrices under a jamming environment with the transmit power constraint at the relays. Additionally, the system performance is evaluated in relation to the average bit error rate (BER) by computer simulation. With the derived optimal diagonal relay amplifying matrix, the jamming influence on system performance with various jamming fractions is examined numerically by using Monte-Carlo simulations. Furthermore, the BER performance under the broadband noise jamming environment is better than the one under the partial-band noise jamming (PBNJ) environment. Finally, the BER performance degrades as the PBNJ jamming fraction γ decreases. Keywords-Amplify-and-forward (AF), Two-way relaying, relay amplifying matrix, minimum mean square error (MMSE), partial-band noise jamming (PBNJ).