The Interference Channel Revisited: Eliminating Interference with a Two Antenna Receiver

01/31/2019
by   Amir Leshem, et al.
0

It is shown that a receiver equipped with two antennas may null an arbitrary large number of spatial directions to any desired accuracy, while maintaining the interference-free signal-to-noise ratio, by judiciously adjusting the distance between the antenna elements. The main theoretical result builds on ergodic theory. The practicality of the scheme in moderate signal-to-noise systems is demonstrated for a scenario where each transmitter is equipped with a single antenna and each receiver has two receive chains where the desired spacing between antenna elements is achieved by selecting the appropriate antennas from a large linear antenna array. We then extend the proposed scheme to show that interference can be eliminated also in specular multipath channels as well as multiple-input multiple-output interference channels. To demonstrate the performance of the scheme, we show significant gains at low and moderate signal-to-noise ratios (0-20 dB) with 4 and 6 users scenarios. The robustness of the proposed technique to small direction estimation errors is also explored.

READ FULL TEXT

Please sign up or login with your details

Forgot password? Click here to reset