Ubiquitous access to entertainment and information
The ever-increasing demands on video or data services in modern telecommunications have imposed a need for robust infrastructure for wireless high-data rate systems. Broadband is a signalling technique over a wide range of frequencies; in data communications multiple pieces of data are sent simultaneously to increase the effective rate of transmission. The term refers to high speed connectivity communications where telephone, Internet and TV are combined to offer communication, entertainment and information to users. Orthogonal Frequency Division Multiplex (OFDM) communication is considered to be the most popular scheme of all the modern high-data rate systems. These include terrestrial or digital audio broadcast or broadband radio access networks (HIPERLAN/2 and IEEE802.11a). Yet, at high Doppler spreads that normally occur when the user is moving fast, for instance while travelling, OFDM modulation may become low performing. Urged by this the BROADWAY project focused on building a system for broadband communications that is aimed for all at anytime and anyplace. Part of the project work involved the development of new Pseudo Random Postfix OFDM multi-carrier modulation schemes to accommodate effective transmission at high carrier frequencies. At such frequencies (60GHz) the Doppler phenomena are frequent and channel variations occur, but the new modulation schemes have been tested and proved powerful in mobile connections. Moreover, the Pseudo Random Postfix OFDM modulation can be effectively applied at all frequencies, and is also suitable for lower bands under various indoor/outdoor operations. For further info click at: http://www.ist-broadway.org/
