一种基于CDMA系统的MPEG-4视频传输速率平滑算法
doi: 10.3724/SP.J.1146.2005.01597
A Real-time Smoothing Scheme of MPEG-4 Video for CDMA Systems
-
摘要: 该文研究了码分多址(CDMA)系统中反向链路上传输MPEG-4视频流的速率平滑算法。由于MPEG-4视频编码具有峰值速率高、速率变化频繁等特点，使得在CDMA蜂窝系统中传输变比特速率(VBR)视频有一定的难度。通过对MEPG视频在图像组(GOP)内应用速率平滑算法，结合CDMA系统物理层的传输速率匹配，可减小传输速率的峰值和变化率，节约带宽。仿真结果表明，该算法有利于提高反向链路系统稳定性，并保证MPEG-4视频的QoS要求，对于信道条件较差的用户，该算法带来的性能改进较明显。
-
关键词:
- 码分多址;MPEG-4视频;速率平滑
Abstract: 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. -
陈前斌，张云麟，李乐民. 实时性MPEG视频源的图片组内平滑算法. 通信学报，2000，21(6)：42-48. Chen Qian-bin, Zhang Yun-lin, and Li Le-min. MPEG video source smoothing within GOP pattern for real-time video applications. Journal on Communications, 2000，21(6)：42-48.[2]Rexford J, Sen S, Dey J, Feng W, and Kurose J, et al.. Online smoothing of live, variable-bit-rate video[C]. Network and Operating System Support for Digital Audio and Video, 1997, Proceedings of the IEEE 7th International Workshop on 19-21 May, 1997: 235-243.[3]Lam S S, Chow S, and Yau D K Y. An algorithm for lossless smoothing of MPEG video[C]. Proceedings of ACM/ SIGCOMM, August 1994: 282-293.[4]Cyril-Daniel Iskander and P Takis Mathiopoulos. Online smoothing of VBR H263 video for the CDMA2000 and IS-95B uplinks[J].. IEEE Trans. on Multimedia.2004, 6(4):647-658[5]Frank H P Fitzek and Reisslein M. MPEG-4 and H.263 video traces for network performance evaluation[J]. IEEE Network, November/December 2001.[6]3GPP2/TSG-C.R1002, 1xEV-DV Evaluation Methodology (V13), 2003.[7][7] 3GPP2 S.R0022-Version 1.0, Video Conferencing Services - Stage 1[S], 2000.[8][8] 3GPP2 C.S0002-C v1.0, Physical layer standard for cdma2000 spread spectrum systems release C[S], 2002.[9][9] 3GPP2 C30-20030414-064R1, IS-2000 release C simulation configuration specification rev.11[S], 2003.[10][10] 3GPP TS 23.107 V6.2.0, Quality of Service (QoS) concept and architecture[S], 2004. -
计量
- 文章访问数: 3869
- HTML全文浏览量: 81
- PDF下载量: 1615
- 被引次数: 0
下载:
