Abstract
In this paper, we study the emergence of topological interference alignment and the characterizing features of a multi-user broadcast interference relay channel. We propose an alternative transmission strategy named the relay space-time interference alignment (R-STIA) technique, in which a -user multiple-input-multiple-output (MIMO) interference channel has massive antennas at the transmitter and relay. Severe interference from unknown transmitters affects the downlink relay network channel and degrades the system performance. An additional (unintended) receiver is introduced in the proposed R-STIA technique to overcome the above problem, since it has the ability to decode the desired signals for the intended receiver by considering cooperation between the receivers. The additional receiver also helps in recovering and reconstructing the interference signals with limited channel state information at the relay (CSIR). The Alamouti space-time transmission technique and minimum mean square error (MMSE) linear precoder are also used in the proposed scheme to detect the presence of interference signals. Numerical results show that the proposed R-STIA technique achieves a better performance in terms of the bit error rate (BER) and sum-rate compared to the existing broadcast channel schemes.
Highlights
As the size of a wireless network increases, interference alignment becomes more complex and challenging
Numerical results confirm that the proposed relay space-time interference alignment (R-space-time interference alignment (STIA)) technique significantly improves the sum-rate and bit error rate (BER) performance compared to the existing broadcast channel schemes [17,18]
We considered that the transmit power for each transmitter ( P) and relay ( PR ) are 50 mW are fixed throughout the simulation
Summary
As the size of a wireless network increases, interference alignment becomes more complex and challenging. K-user MIMO broadcast channels (BC) with a shared relay and channel state information (CSI) are essential for enhancing the performance of a wireless broadcast channel network. It has been demonstrated in [1] that the channel state information at the transmitter (CSIT) is essential for optimizing the wireless-broadcast-channel performance. In [2], the authors discuss about the fully-associated interference networks, where a relay equipped with several antennas forwards the received signals instantly to the desired receivers. The outdated CSI from all the transmitters sends the estimated CSI back to the relay with a handling delay
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