Abstract

This paper addresses the problem of efficient bandwidth allocation for multiuser orthogonal frequency division multiplexing (OFDM) systems over frequency-selective channels. For a given coding and medium access scheme and for specific channel gains, the achievable data rates depend on the assignment of the available subchannels to the different users. However, in frequency-selective channels, the various users experience different channel conditions, thus the application of effective bandwidth allocation rules results in enhanced multiuser diversity. This paper presents a computationally efficient solution for dynamic subchannel assignment. The proposed algorithm provides enhanced system performance compared with the fixed time division multiple access (TDMA) solution and also results in proportional data rates according to channel quality of each user. As a case study, we demonstrate the performance of the proposed algorithm in the indoor power line network with multiple OFDM links between a central station and a number of user devices.

Talk to us

Join us for a 30 min session where you can share your feedback and ask us any queries you have

Schedule a call

Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.