Abstract:

The interference alignment is a transmission technology which aligns interference signal from other transmitters to the same signal subspace for reducing the interference to the desired signal. In recent years this technology has been widespread concerned. An interference alignment precoding optimization algorithm based on power allocation was proposed for the K user multiple input multiple output (MIMO) interference channel system. First, the signal is transmitted according to the best matching of the precoding matrix with the best feature sub channel based on the chord distance matrix by the singular value decomposition of the channel. Then the power allocation is assigned according to the channel matrix strength and also the precoding matrix is optimized. This method can ensure the signal strength maximally. Furthermore, the proposed algorithms calculate the precoding matrix and the receiver inhibition matrix without iteration. Simulation shows that this method not only reduces the complexity of the system, but also improves the bit error rate (BER) performance.

Key words: channel state information, interference alignment, power allocation, singular value decomposition