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Interference cancellation scheme without feedback is proposed for X channels with four antennas at each user. Space-time codeword with Alamouti structure is designed for each user. Codewords are combined according a certain rule. The unwanted codewords are cancelled by linear operation on the received signals. Then, multi-user interference is mitigated by the orthogonal property of the Alamouti code. Comparing with the existing scheme for the same scene, feedback information is not required in the proposed scheme. So the transmission efficiency is improved.

Improved Interference Cancellation Scheme for &lt;i&gt;X&lt;/i&gt; Channels with Four Antennas

Improved Interference Cancellation Scheme for <i>X</i> Channels with Four Antennas