Title :
Interference resistant scalable video transmission over DS-CDMA channels
Author :
Bansal, Manu ; Pynadath, Elizabeth S. ; Kondi, Lisimachos P. ; Matyjas, John D. ; Medley, Michael J. ; Reichhart, Stephen P. ; Turck, Kurt A.
Author_Institution :
Dept. of Electr. Eng., State Univ. of New York, Buffalo, NY
Abstract :
In this work, we demonstrate the interference mitigation capabilities of the auxiliary vector (AV) receiver for scalable video transmission over direct-sequence code division multiple access (DS-CDMA) systems using a hardware testbed. The proposed receiver design is also compared to the conventional RAKE matched-filter (RAKE-MF) and minimum variance distortionless response (MVDR) receivers. The DS-CDMA video data stream is transmitted over an RF channel under \´\´real world\´\´ Rayleigh-faded multipath channel conditions, emulating open and/or urban battlefield environments. The state-of-the-art Agilent E4438C vector signal generator and baseband studio fader is used to provide a configurable "real time" RF channel. In this work, the "foreman" video sequence is source encoded using an MPEG-4 compatible video codec and channel-coded using rate-compatible punctured convolutional (RCPC) codes. After spreading and modulating, the resultant bitstream is transmitted over a user-defined Agilent wireless channel emulation. Upon chip-matched filtering and sampling at the chip-rate on a hardware testbed, the received data are despread/demodulated using the AV, RAKE-MF and MVDR receivers and, subsequently, channel and source decoded. The resultant video clips exemplify that the AV receiver outperforms the MVDR and the RAKE-MF receiver counterparts under a wide range of rates and channel conditions
Keywords :
Rayleigh channels; code division multiple access; combined source-channel coding; convolutional codes; image sequences; interference suppression; military communication; multipath channels; radiofrequency interference; spread spectrum communication; video coding; video communication; video streaming; DS-CDMA channels; RF channel; Rayleigh-faded multipath channel; auxiliary vector receiver; battlefield environments; channel code; direct-sequence code division multiple access; foreman video sequence; interference resistant; rate-compatible punctured convolutional codes; scalable video transmission; source code; video codec; video data stream; wireless channel emulation; Baseband; Hardware; Interference; Multiaccess communication; Multipath channels; RAKE receivers; Radio frequency; Signal generators; Streaming media; System testing;
Conference_Titel :
Military Communications Conference, 2005. MILCOM 2005. IEEE
Conference_Location :
Atlantic City, NJ
Print_ISBN :
0-7803-9393-7
DOI :
10.1109/MILCOM.2005.1605750