Test-Bed Implementation of Iterative Transceiver Design and Power Control for Wireless MIMO Interference Networks

Test-bed implementation of iterative transceiver design and power control algorithm for downlink transmission in a multiple-input multiple-output (MIMO) cellular network is presented1. The network consists of three cells where within each cell one base station (BS) communicates with one mobile station (MS) while interferes the other MSs outside the cell. Each terminal is equipped with two antennas and the air interface of the network is designed based on OFDM modulation. The implemented algorithm performs power control to guarantee successful communication at a desired transmission rate while designing transmitter precoders according to the elegant interference alignment concept. Interference alignment in an interference network refers to “a construction of signals in such a manner that they cast overlapping shadows at the receivers where they constitute interference while they remain distinguishable at the intended receivers where they are desired” [3]. An extension of the original interference alignment algorithm, called MaxSINR, along with a power control method is incorporated in our algorithm to guarantee a fixed rate communication and minimization of transmit power at the same time. The indoor measurements were performed on an universal software radio peripheral (USRP) based test-bed. Fig. 1 shows the network structure where the algorithm was implemented in.