Abstract
An application of a second-order adaptive lattice IIR notch filter for rejection of NBI in direct sequence spread spectrum system (DSSS) is studied . Closed-form analytical expressions for signal-to-noise ratio (SNR) improvement factor and bit error ratio (BER) of the system are derived. The performances of the algorithm have been researched and simulated in MATLAB. The adaptive filter is designed and implemented on FPGA, which is simple to realize. It is shown by the test on hardware circuit that the filter had a capacity of about 21dB for NBI rejection which satisfies the requirement.
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