Analysis of performance of QAM system when subjected to sharpened Raised Cosine filter

摘要

This paper proposes to sharpen a pulseshaping Raised Cosine filter. Filter sharpening could be used when improved filtering is needed, but insufficient ROM space is available to store more filter coefficients, or as a way to reduce ROM requirements. QAM is one of widely used modulation techniques because of its efficiency in power and bandwidth. In this paper, the coefficients of raised cosine and sharpened raised cosine filter are generated in MATLAB. Utilizing these coefficients the performance of raised cosine filter and sharpened raised cosine filter is observed under different QAM(16QAM, 32QAM and 64QAM) by comparing their error rates and SNR using VSG (vector signal generator) and VSA(vector signal analyser).