<![CDATA[In high-speed networks such as 4G/5G, bandwidth constraints are a major challenge to digital communication systems, where Inter-Symbol Interference (ISI) is a major problem. The present paper addresses the application of raised cosine filtering to eliminate ISI and improve signal integrity in the context of several modulation methods (BPSK, QPSK and M-PSK). By using MATLAB simulations, a series of roll-off values (0.1 to 0.9) were studied, with the performance measured in terms of Bit Error rate (BER), peak-to-average power ratio (PAPR) and signal quality, represented by eye diagrams. The work concludes that a higher roll-off factor has led to a better reduction of ISI and signal clearance although there is an expense of using more bandwidth. The findings point out to a trade-off between bandwidth efficiency and ISI mitigation which is useful in the design of optimized filters in contemporary high-speed communication systems. Such results can be applied to the creation of more efficient filtering methods to realistic networks such as 4G/5G and Wi-Fi, which can provide useful information to the designers of the communication systems.]]>
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