%0 Journal Article
%T A Real-time Smoothing Scheme of MPEG-4 Video for CDMA Systems<br>一种基于CDMA系统的MPEG-4视频传输速率平滑算法
%A Qin Jie
%A Liu Bing-zhang
%A Zhang Xin
%A Yang Da-cheng
%A <br>秦 洁
%A 刘兵章
%A 张 欣
%A 杨大成
%J 电子与信息学报
%D 2007
%I 
%X A real-time smoothing scheme of MEPG-4 video for CDMA systems is proposed in this paper. Due to the high peak rate and frequent rate variations nature of MPEG-4 video, it is a challenge to transmit real-time variable bit rate video on CDMA systems. In the proposed scheme, a real-time video smoothing algorithm within Group of Pictures (GOP) is carried out first, and transmitter chooses the transmission rate among CDMA physical layer rate set according to the smoothing rate. This scheme can considerably reduce the peak rate, variance and bandwidth of the transmitted signal. The simulation results show that with the proposed smoothing scheme, higher system stability and better QoS have been achieved. Moreover, the system performance gain is more considerable when the channel condition is relatively bad.
%K MPEG-4 video
%K Rate smoothing<br>码分多址
%K MPEG-4视频
%K 速率平滑
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=1319827C0C74AAE8D654BEA21B7F54D3&jid=EFC0377B03BD8D0EF4BBB548AC5F739A&aid=6953E004F3FCBAEE&yid=A732AF04DDA03BB3&vid=771469D9D58C34FF&iid=DF92D298D3FF1E6E&sid=0E6C9B38667ABC5C&eid=3F0F3A1477A0E1FE&journal_id=1009-5896&journal_name=电子与信息学报&referenced_num=0&reference_num=11