A novel approach for designing cosine-modulated transceivers

This paper introduces a novel approach for designing critically sampled cosine-modulated transceivers (CMTs) for communications applications. The key idea in this approach is to design the prototype filter in such a manner that it provides a properly optimized tradeoff between the inter-symbol and inter-channel interferences for CMTs without directly concentrating on designing the prototype filter according to any predetermined criteria. In order to generate a very fast technique for testing this approach, the windowing technique is used for optimizing the prototype filter and the window function is a generalized Blackman window in the sense that this window function has the fourth additional term. Using this windowing approach results in a very fast unconstrained optimization problem with only three unknowns involved for optimally determining the above-mentioned tradeoff for a CMT, independently of the order of the prototype filter and the number of channel of the CMT. Several exampled are included showing that CMTs with very good properties can be achieved very quickly by using the proposed technique.