Title :
Channel-aware video softcast scheme
Author :
Fan Zhang ; Anhong Wang ; Haidong Wang ; Suyue Li ; Xiaoli Ma
Author_Institution :
Inst. of Digital Media & Commun., Taiyuan Univ. of Sci. & Technol., Taiyuan, China
Abstract :
The main challenge of wireless video multicast is to support receivers´ heterogeneous characteristics and realize graceful degradation of video quality. The newly emerged Softcast provides smooth video quality for wireless multicast based on raw orthogonal frequency division multiplexing (OFDM) over additive white Gaussian noise (AWGN) channels but its performance suffers when transmitted over practical wireless fading channels. This paper proposes a new Channel-Aware Softcast (Softcast-CA) scheme to address the case of practical multipath fading instead of the raw one. Softcast-CA selects the subcarriers with better channel qualities to transmit video in an analog-like fashion. The simulation results show that Softcast-CA scheme achieves up to 3 dB improvement compared with the original Softcast in the scenarios of unicast and multicast.
Keywords :
AWGN channels; OFDM modulation; fading channels; multicast communication; video coding; AWGN channels; OFDM; additive white Gaussian noise channels; channel qualities; channel-aware video softcast scheme; raw orthogonal frequency division multiplexing; scalable video coding; softcast-CA scheme; subcarrier allocation; video quality smoothing; wireless fading channels; wireless video multicast; Channel estimation; Decision support systems; Fading; Media; Mobile communication; Multimedia communication; Resource management; OFDM; Softcast; subcarrier allocation;
Conference_Titel :
Signal and Information Processing (ChinaSIP), 2015 IEEE China Summit and International Conference on
Conference_Location :
Chengdu
DOI :
10.1109/ChinaSIP.2015.7230469
