Implementation aspects for interference alignment

Abstract

Several interference alignment (IA) testbeds have been reported by research groups that validate the theoretical findings thus demonstrating the feasibility of IA. The design complexity of the IA testbed is significant since many simultaneous wireless links have to be established to observe the benefits of IA. Therefore, the already enormous efforts needed for the development of multiple-input multiple-output (MIMO) testbeds are folded multiple times in IA testbeds. In general, testbeds can be categorized into three groups depending on the hardware platform, generic, specific and the hybrid of two. Clearly, developing on generic, hybrid and application specific platforms in turn are the safe steps towards real life prototyping. There are many research groups that have been developing IA on generic platforms [1]- [17]. To the best of our knowledge, there is only one research group that has developed on a hybrid platform [18], and none on the application specific platform. In this paper, we review the experimental IA evaluations in the literature, include important aspects from well-known prototyping principles in the picture, and give comparative discussion with the state-of-art wireless communications testbeds.

Improving mobile communications with antennas that map the channel and move to local maxima

“…Spatial and angular resolutions of fading channels depend highly on the environment, but generally sampling two directions might give similar overall results as sampling two positions with antenna selection. 32 The achievable rate of advanced techniques such as interference alignment 33 and channel modulation 34,35 also depends on the channels to the other users/antennas and channel changes are actively used. The proposed channel maximizing movement is a promising candidate for symbiosis with these schemes and not a direct competitor, seeing that these advanced schemes benefit from increased SNR and static channels.…”