Robust video transmission over wideband wireless channel using space-time coded OFDM systems
نویسندگان
چکیده
A space-time coded orthogonal frequency-division multiplexed (STC-OFDM) system is proposed to transmit layered video signals over wireless channels. The space-time coding can provide a diversity gain for the multiple-antenna system while OFDM can alleviate the frequency-selective fading effect. An input video sequence is compressed and partitioned into layers with different priorities. Then, an unequal error protection scheme based on the product Reed-Solomon (RS) codes is employed to provide different levels of protection to different layers. At the receiver, a minimum mean square error (MMSE) detector with interference cancellation (IC) is integrated with the space-time decoder to reconstruct the desired signal effectively. We derive an analytic bound for the error probability, and conduct experiments for the transmission of the H.263 video bitstream. It is shown that the proposed scheme enhances the PSNR performance significantly in the environment with a moderate signal-to-noise ratio.
منابع مشابه
A joint channel estimation and unequal error protection scheme for image transmission in wireless OFDM systems
Abmac-OrIhqonal Frequency Division Multiplexing (OFDM) modulatlon, adopted by the L%@tal Video Broadcasting (DVB-T) standard, has been remgniml for its good performance for high data rate wireless communications. Therelore, the study ofthe robust transmission of multimedia data over OFDM system bas attracted e d d v e research interests. In the past, channel eslimation, which is an important as...
متن کاملSource-channel coding for robust image transmission and for dirty-paper coding
Source-channel Coding for Robust Image Transmission and for Dirty-paper Coding. (December 2005) Yong Sun, B.S., Tsinghua University, Beijing, P.R.China; M.S., Tsinghua University, Beijing, P.R.China Chair of Advisory Committee: Dr. Zixiang Xiong In this dissertation, we studied two seemingly uncorrelated, but conceptually related problems in terms of source-channel coding: 1) wireless image tra...
متن کاملCo-channel interference cancellation for space-time coded OFDM systems
Combined with space-time coding, the orthogonal frequency division multiplexing (OFDM) system explores space diversity. It is a potential scheme to offer spectral efficiency and robust high data rate transmissions over frequency-selective fading channel. However, space-time coding impairs the system ability to suppress interferences as the signals transmitted from two transmit antennas are supe...
متن کاملA New Unequal Error Protection Technique Based on the Mutual Information of the MPEG-4 Video Frames over Wireless Networks
The performance of video transmission over wireless channels is limited by the channel noise. Thus many error resilience tools have been incorporated into the MPEG-4 video compression method. In addition to these tools, the unequal error protection (UEP) technique has been proposed to protect the different parts in an MPEG-4 video packet with different channel coding rates based on the rate...
متن کاملTo Improve Bit Error Rate of Turbo Coded Ofdm Transmission over Noisy Channel
Orthogonal Frequency Division Multiplexing (OFDM) has become a popular modulation method in high speed wireless communications. By partitioning a wideband fading channel into flat narrowband channels, OFDM is able to mitigate the detrimental effects of multipath fading using a simple one-tap equalizer. There is a growing need to quickly transmit information wirelessly and accurately. OFDM is a ...
متن کامل