Question

A time frequency well localised pulse for multiple carrier transmission

Answer 1

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Multiple carrier transmission represents a way to cope with the time and frequency selectivity of mobile radio channels. The signals are pulse shaped and transmitted on multiple carriers to reduce the multipath effects. The usually used rectangular or Nyquist root impulses permit a transmission with nearly optimal spectral efficiency, but they are not well localized either in time or in frequency so that the residual intersymbol interference (ISI) and interchannel interference (ICI) lower the system performance. Therefore, we present a new impulse to minimize ISI and ICI

Answer 2

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ABSTRACT :

in multi carrier transmission schemes , the essential requirement on the elementry or envelope functions is the orthogonality with it's time - frequency shifted version. However , the time and frequency dispersion of the mobile radio channel leads to the loss of orthogonality which produces intersymbol interference ( ISI ) and interchannel interference ( ICI ). Therefore another requirement on the elementry pulse has to be imposed : the good localization in time and frequency. Based on the characteristics of the mobile radio channel , we design a new pulse to minimize ICI and ISI....

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