Root raised cosine roll-off (RRC) filter is one of the most fundamental elements in modern digital communications. This paper proposes a new method to efficiently realize the RRC filter. The method employs cubic Hermite interpolation to obtain a piecewise-polynomial approximation for the impulse response of the RRC filter. Then, the approximated impulse response is efficiently realized by using...

This article introduces the notion of uncoded, partially overlapped, staggered quadrature raised-cosine modulation (SQORC-P) as well as that of a trellis-coded form that is implemented as a specific embodiment of the recently introduced crosscorrelated trellis-coded quadrature modulation (XTCQM). Consideration is given to the power spectral density (PSD) of the scheme over both linear and nonli...

Discrete multitone (DMT) offers an elegant way to achieve high capacity, dividing the spectrum into small bands and processing these individually. The per tone equalizer (PTEQ) optimizes the capacity for each band individually, thus optimizing the whole. However, it provides little protection against narrow band radio frequency interference (RFI), being spread over all tones because of the high...

This paper introduces a novel algorithm for partial band interference excision in direct sequence spread spectrum (DSSS) communication systems like the Wideband Code Division Multiple Access (WCDMA) air interface standard used in third generation mobile telecommunication networks. The excision algorithm consists of two stages: signal decomposition using the raised cosine empirical mode decompos...

The current research trends towards mobile broadband communications highly focused on mitigating the power spectral analysis and frequency localization issues associated with Orthogonal Frequency Division Multiplexing namely OFDM signals. There are various existing research works have been found ensure less efficient communications strategies. Therefore to address various interference problems ...

The problem of inter-carrier interference (ICI) in orthogonal frequency-division multiplexing (OFDM) systems has a dramatic impact on their overall performance and robustness. For this reason, various techniques have been proposed in order to eliminate this undesired phenomenon with the most common being the use of transmitter pulse-shaping. Capitalizing on some previous investigations, we here...

Specified ultra-short pulse waveforms could be synthesized with high-resolution zero-dispersion pulse shaping system. The system and parameters are analyzed and discussed. The pulse shaping system with optimized parameters could resolve the frequency components of ultra-broad bandwidth pulse and prevent the spatial shaping of individual frequency components. The specified waveforms, Meyer wavel...