Patent ID: 7382717
Filing Date: 2008-06-03
Classification: H04L

Abstract:
1. A system for reducing adjacent channel interference (ACI) in a multicast multicarrier modulation system comprising: a generator for generating a spectrally efficient modified pulse for multicast multicarrier modulation using better than root raised cosine orthogonal frequency division multiplexing (BTRRC OFDM) in an Offset OFDM structure, wherein the BTRRC is expressed as a square root form of: where bandwidth B=1/(2Ts) and where Ts is a symbol interval and α is a roll-off factor; and wherein the BTRRC is calculated using a Fourier transform, the BTRCC providing better bit error rate (BER) than the BER achieved with RRC in presence of timing errors; and wherein the Offset OFDM structure is expressed by where m is a subcarrier number or a symbol number in frequency, s at least one processor for adapting the spectrally efficient modified pulse at the edge of subchannel for reducing the ACI product by the total multicarrier signal.