The design and simulated performance of a mobile video telephony application for satellite third-generation wireless systems

Abstract

The design and performance of a low bit-rate video telephony service for mobile third-generation (3G) systems is presented. The ITU-T G.723.1 speech coding and the ITU-T H.263 video coding recommendations are used, as proposed by the ITU-T H.324 low bit-rate multimedia communications recommendation. The target bit-rate for the H.324 service is 64 kb/s. The design is performed in conjunction with that of a wideband-code division multiple access (W-CDMA) radio transmission technology (RTT) system, proposed by the European Space Agency (ESA) for the satellite component of the ITU IMT-2000 standard. Most of the results could also be applied to the 3G terrestrial systems. The use of concatenated channel coding with convolutional inner coding and Reed-Solomon (RS) outer coding is investigated. Service designs based on equal error protection (EEP) and unequal error protection (UEP) schemes for the audio and video sources are compared. The simulation of the proposed video telephony servicesshows that significantly more graceful video and audio degradation is obtained with the proposed UEP scheme than with a more straightforward EEP method. The UEP scheme reduces significantly the occurrence of highly annoying audio and video artefacts, allowing satellite-based video telephony services that are compatible with the current Internet-based applications.Index Terms-H.263, mobile satellite communications, unequal error protection (UEP), video coding and partitioning, video telephony.

Quality-of-service provisioning and efficient resource utilization in CDMA cellular communications

“…• Joint source/channel coding-power/rate allocation for video services: An effective way for video transmission over wireless links is to use joint source-channel coding [20]. For CDMA networks with interference-limited capacity, it is important to take into account the power/rate management in CDMA systems when designing the source and channel coding.…”

An error-resilient H.263+ coding scheme for video transmission over wireless networks

“…For error-free transmission, the PSNR reproduced at the receiver is given by [7] The ITU-T error pattern files for WCDMA [8] are used to simulate the random errors of wireless channels. The encoded streams from baseline and improved encoders are disturbed respectively by the error pattern files W1~W6.…”

Performance of Video Telephony Services in UMTS using Live Measurements and Network Emulation

“…In [16] tests with a H.263 video codec that provides data on two different prioritized layers have been introduced. The effects of an Unequal Error Protection (UEP) were analyzed within this article.…”

“…This is demonstrated by the channels that connect the system control to the audio and the video codec. The video transport channels are adapted to the measurements of [16] and to the previous results. The high priority data of the video codec is transmitted in the acknowledged mode and is protected by a one third turbo code and an attached checksum.…”