Design and Implementation of A Real-time Baseband Adaptive Digital Interference Canceller

In this paper, a baseband digital canceller is designed and implemented to cancel the co-site interference. Especially, in order to achieve high-speed low-latency cancellation performance, a transposed form retimed delayed LMS (TFRDLMS) filter structure is introduced and extended to complex signal form. In the proposed complex TF-RDLMS filter, the basic Processing Module (PM) is established with a set of real cross-coupling signal flows. Then, the canceller is implemented with Xilinx field programmable gate array (FPGA) chip by cascading several PMs. Finally, the validity and effectiveness of the implemented canceller is confirmed by experimental results. It is shown that the canceller can achieve 31 dB and 27 dB cancellation performance for 5 MHz and 10 MHz interference signal, respectively.