NBI Suppression in Non-Linear UWB Channels using Second Order CPP-ANF

UWB systems are continuously affected by narrow band interference (NBI) emanating from traditional sources for which its mitigation continues to be a challenging issue. This is more so if the channels are considered to be non-linear which in reality is the actual scenario. NBI suppression is an essential element for achieving appropriate quality of service (QoS) and ensuring link reliability. Here, we report the design of a second-order adaptive notch filter (ANF) based scheme designed for suppression of single and multiple NBI in non-linear channel condition used by UWB systems. The proposed second order ANF uses a gradient descent adaptation in combined pipelined-parallelism (CPP) approach demonstrating reduced computational complexity and lower power requirement for an efficient hardware design. The CPP mode is ascertained after performing certain experiments using a number of digital filter design approaches like direct, cascade etc. Further, the system is also tested under IEEE 802.15.3a CM1, CM2, CM3, and CM4 channels. Key–Words: UWB, NBI, ANF, CPP, non-linear, NARMA