Paper Info
Title
ALAVIT: An adaptive layered video transmission for wireless OFDM channels.
Abstract
Abstract It is well-known that the layered transmission for video bit-streams generated by a layered coding can gracefully accommodate the receiversu0027 heterogeneity in wireless networks. In this paper, we propose a new layered video transmission scheme employing the subcarrier allocation based on the wireless channel characteristics of orthogonal frequency division multiplexing (OFDM) physical (PHY) layer, leading to an a daptive la yered vi deo t ransmission (ALAVIT). In our scheme, scalable video coding (SVC) is exploited to generate the layered video bit-streams; and the resulting base layer (BL) and enhancement layer (EL) bits are modulated differently to obtain their individual wireless symbols. According to the estimated channel characteristics described by the subcarrier channel gains of a connected wireless receiver, subcarriers with good channel quality are allocated to BL symbols for a better protection of these more important bits. In this unicast case, our ALAVIT scheme is demonstrated to provide a much better performance as compared to the state-of-the-art PHY layer techniques such as s-mod and MixCast. This framework is then generalized from unicast to multicast where the problem is formulated into an optimization involving the average bit-error-rate (BER) over all connected receivers. While the complexity of solving this problem remains extremely high for the current OFDM case of 64 or even more subcarriers, we demonstrate by using a case study of 8 subcarriers that the optimal solution indeed offers a better performance than the heuristic solutions.
Year
Venue
Field
2016
Digital Signal Processing
Subcarrier,Wireless network,Computer science,Computer network,Communication channel,Physical layer,PHY,Unicast,Orthogonal frequency-division multiplexing,Scalable Video Coding
DocType
Volume
Citations 
Journal
55
0
PageRank 
References 
Authors
0.34
26
5
Name
Order
Citations
PageRank
Fan Zhang113437.15
Wang Anhong216938.51
Xiaoli Ma353732.48
Cairong Xing400.34
B Zeng51374159.35