A novel adaptive equalization and cancellation algorithm for direct conversion receivers

A novel technique is proposed in this paper to remove IM2, DC offset, ISI and AWGN simultaneously in a direct conversion receiver by using an adaptive complex filter. DC offset is modeled as a random tap, and IM2 signals are treated as variable real DC values both in I/Q channels separately. Then we can remove DC offset and IM2 simultaneously with only one complex tap. Furthermore, a decision feedback equalizer is employed to cancel the channel ISI. Simulation results are provided which verify the superior performance of the proposed method.