ACCESS SYSTEMS BASED ON THE OFDM TRANSMISSION TECHNIQUE

摘要

ABSTRACT The present invention relates to a new power-efficient multi-user indoor wireless method and system based on the OFDM transmission technique on the downlink. In the new system subcarrier and modulation mode are allocated such that the bit-rate and bit-error rate requirements of all the active users are simultaneously satisfied. Such a system is expected to be valuable in wireless multimedia communications where high-speed downlink access is extremely important. Power and bandwidth are two valuable resources in communications and the new system allocates these resources in an efficient manner. At present there are no schemes which have been presented to allocate resources in such an efficient manner while taking care of the user requirements. Results presented using simulations clearly illustrate the performance advantages of the new scheme when compared with other schemes.