Multi-user multiple-input and multiple-output (MU-MIMO) transmission has been extensively studied to enhance the spectral efficiency of wireless communication systems. The performance of MU-MIMO suffers due to the presence of residual multi-user interference. Linear interference cancellation can offer excellent performance when a large number of antennas are available. This, however, is impractical in a mobile station. In this paper, we apply a collaborative interference cancellation scheme to a precoded MU-MIMO system. In order to effect collaboration, we implement received signal sharing among mobile stations using wireless local area network connections. We carried out transmission experiments in an indoor environment to test the performance of our precoded MU-MIMO system with collaborative interference cancellation.