Performance Comparison of Interference Alignment

Optimum performance of any transmission scheme is implicitly coupled with the optimal receive-strategy. Linear receiver strategies for interference alignment based precoding are investigated here and compared with other cooperative and non cooperative schemes in OFDM based downlink cellular system. For this purpose, the transceiver schemes have been applied on two different cooperation scenarios namely Intra Base Station and Inter Base Station. Using the system simulations, we have evaluated and compared the mean spectral efficiency and cell border throughput. The results have shown that the interference alignment based scheme is optimum only when there is no out of cluster interference. The signal to leakage optimization based precoding outperforms interference alignment in such scenarios. Moreover, interference alignment has shown sustainable gains only when the receiver is able to estimate all the interferences and suppress them. Further more Intra BS cooperation has shown high cell spectral efficiency and Inter BS cooperation provides gain in the cell-edge throughput.