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Journal of Electronic Imaging • Open Access

Hybrid digital-analog video transmission in wireless multicast and multiple-input multiple-output system
Author(s): Yu Liu; Xiaocheng Lin; Nianfei Fan; Lin Zhang

Paper Abstract

Wireless video multicast has become one of the key technologies in wireless applications. But the main challenge of conventional wireless video multicast, i.e., the cliff effect, remains unsolved. To overcome the cliff effect, a hybrid digital-analog (HDA) video transmission framework based on SoftCast, which transmits the digital bitstream with the quantization residuals, is proposed. With an effective power allocation algorithm and appropriate parameter settings, the residual gains can be maximized; meanwhile, the digital bitstream can assure transmission of a basic video to the multicast receiver group. In the multiple-input multiple-output (MIMO) system, since nonuniform noise interference on different antennas can be regarded as the cliff effect problem, ParCast, which is a variation of SoftCast, is also applied to video transmission to solve it. The HDA scheme with corresponding power allocation algorithms is also applied to improve video performance. Simulations show that the proposed HDA scheme can overcome the cliff effect completely with the transmission of residuals. What is more, it outperforms the compared WSVC scheme by more than 2 dB when transmitting under the same bandwidth, and it can further improve performance by nearly 8 dB in MIMO when compared with the ParCast scheme.

Paper Details

Date Published: 13 January 2016
PDF: 14 pages
J. Electron. Imaging. 25(1) 013006 doi: 10.1117/1.JEI.25.1.013006
Published in: Journal of Electronic Imaging Volume 25, Issue 1
Show Author Affiliations
Yu Liu, Beijing Univ. of Posts and Telecommunications (China)
Xiaocheng Lin, Beijing Univ. of Posts and Telecommunications (China)
Nianfei Fan, Beijing Univ. of Posts and Telecommunications (China)
Lin Zhang, Beijing Univ. of Posts and Telecommunications (China)


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