Robust transmission of packet based H.264/AVC video with data partitioning over DS-CDMA wireless channels.

摘要

In this thesis, we address the problem of robust transmission of packet based H.264/AVC video over Direct Sequence - Code Division Multiple Access (DS-CDMA) channels. H.264 provides excellent coding efficiency and ease of transportation over a wide range of networks. Along with other error-resilience features, data partitioning is employed while encoding the source to produce video packets of unequal importance. We investigate the use of data partitioning for such wireless systems for a wide range of channel conditions and various DS-CDMA receiver types. The performance of this system is compared with the encoding and transmission schemes not using data partitioning.; In the proposed system, the data partitioned video packets are packetized into packets of equal size, as per IP/UDP/RTP based network architecture and are sorted into levels for giving unequal error protection (UEP) using Rate Compatible Punctured Convolutional (RCPC)/Cyclic Redundancy Check (CRC) codes. After spreading and modulating, the resultant bitstream is transmitted over a multipath Rayleigh fading channel with Additive White Gaussian Noise (AWGN) and interference. The received data are despreaded and demodulated using the Auxiliary Vector (AV) receiver or conventional RAKE matched filter (RAKE-MF) receiver and, subsequently, channel and source decoded.; Our experimental results show the effectiveness of using data partitioning for transmissions over wireless networks. Also for such systems, the superior interference mitigation capabilities of the AV receiver are shown in comparison to the RAKE-MF receiver.