Patent ID: 6680966
Filing Date: 2004-01-20
Classification: H04L

Abstract:
A spread-spectrum transmission system with multiple carrier modulation, the system comprising a plurality of filters for filtering signals for transmission over subcarriers prior to being transmitted in order to enable synchronization of the subcarriers in time upon reception, wherein each of the subcarriers carries a plurality of chips that result from spreading a single symbol, and each of said filters is adapted to limit a level of interference generated on a given sub-carrier by adjacent carriers by providing an attenuation of approximately 30 dB at a freguency (fk+fkâˆ’1)/2, where fk is a carrier frequency for each of the subcarriers, 0&lE;k&lE;Mâˆ’1, M is the number of subcarriers, k is an index of the subcarriers, and k and M are integers.