title: Two-Level Scheduling for Video Transmission over Downlink OFDMA Networks.
abstract: This paper presents a two-level scheduling scheme for video transmission over downlink orthogonal frequency-division multiple access (OFDMA) networks. It aims to maximize the aggregate quality of the video users subject to the playback delay and resource constraints, by exploiting the multiuser diversity and the video characteristics. The upper level schedules the transmission of video packets among multiple users based on an overall target bit-error-rate (BER), the importance level of packet and resource consumption efficiency factor. Instead, the lower level renders unequal error protection (UEP) in terms of target BER among the scheduled packets by solving a weighted sum distortion minimization problem, where each user weight reflects the total importance level of the packets that has been scheduled for that user. Frequency-selective power is then water-filled over all the assigned subcarriers in order to leverage the potential channel coding gain. Realistic simulation results demonstrate that the proposed scheme significantly outperforms the state-of-the-art scheduling scheme by up to 6.8 dB in terms of peak-signal-to-noise-ratio (PSNR). Further test evaluates the suitability of equal power allocation which is the common assumption in the literature.
authors.affiliation: Department of Electrical Engineering, Faculty of Engineering, University of Malaya, Kuala Lumpur, Malaysia.|Wireless Innovation, MIMOS Berhad, Technology Park Malaysia, Kuala Lumpur, Malaysia.
authors.forename: Mau-Luen
authors.initials: ML
authors.lastname: Tham
authors.affiliation: Department of Electrical Engineering, Faculty of Engineering, University of Malaya, Kuala Lumpur, Malaysia.
authors.forename: Chee-Onn
authors.initials: CO
authors.lastname: Chow
authors.affiliation: College of Information Science and Technology, Nanjing Forestry University, Nanjing, China.
authors.forename: Yi-Han
authors.initials: YH
authors.lastname: Xu
authors.affiliation: Wireless Innovation, MIMOS Berhad, Technology Park Malaysia, Kuala Lumpur, Malaysia.
authors.forename: Nordin
authors.initials: N
authors.lastname: Ramli
mesh_terms: D000465:Algorithms; D003195:Computer Communication Networks; D044962:Data Compression; D059629:Signal-To-Noise Ratio; D014741:Video Recording