In this paper, we analyze the performance of interference alignment of device-to-device (D2D) uplink underlay\ncellular networks. By fully considering the impact of imperfect precoding vectors caused by limited feedback, the\nexact closed-form expressions of average throughput for cellular network and D2D network are derived in terms of\ntransmit power and the number of feedback bits. The accuracy of the average throughput is verified by simulation\nresults. Our analytic results provide great promises to practical system designs
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