OFDM Air-interface Design for Multimedia Communications

  • Prasad, Ramjee, (Projektdeltager)



    The main topic of this activity is the design of the air-interface of an OFDM-based, wide-band mobile communications systems for indoor and low-range, low-mobility outdoor scenarios. Wireless computer networks are the intended application of such systems, enabling wireless multimedia communications. The emphasis of this study lies on the physical radio link. Wireless transmission of ATM cells should be supported at peak data rates of 155 Mbit/s, according to the target specifications of the air-interface multiple access scheme under development. The 60 GHz mm-wave frequency band is considered, mainly because the required bandwidth in the order of several hundreds of MHz is only available at these frequencies. Synchronization and channel estimation algorithms are developed and evaluated, utilizing a known training symbol, which is periodically transmitted in the beginning of the fixed frame structure. It has been considered that robust and efficient synchronization and channel estimation schemes - critical tasks for OFDM receivers - are enabled by the training symbol, at the cost of a very small overhead. Now the implementation of the main signal-processing algorithm for the OFDM transceivers is in plan on a DSP-based experimental platform. (Klaus Witrisal, Ramjee Prasad)
    Effektiv start/slut dato31/12/200331/12/2003