video telephony
The Performance of H263 Based Video Telephony over Turbo Equalized GSM/GPRS
... video telephony. Although the 2G systems have not been designed with video communications in mind, with the aid of the spe- cially designed error-resilient, fixed-rate video codecs [3]–[6] ...
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Turbo Detected Unequal Protection MPEG 4 Wireless Video Telephony using Trellis Coded Modulation and Space Time Trellis Coding
... Again, in this contribution, a novel unequal-protection joint source-coding, channel-coding, modulation and spatial diver- sity aided turbo-transceiver is proposed, which consists of a STTC, a TCM and two different-rate ...
5
Voice and Video Telephony Services in Smartphone
... Multimedia telephony is a delay-sensitive ...the telephony service and user ...video telephony. Through a simulation study the impact of voice and video telephony is evaluated on ...
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Synergy effects with mobile (audio and) video telephony
... mobile video telephony (MVT) is not used on a large ...and video was under ...standardized video-listening test was determined for three screen sizes: mobile phone, PDA and PC ...
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Burst by burst Adaptive Joint Detection CDMA/H 26L Based Wireless Video Telephony using TTCM and LDPC Codes
... bit-rate video coding techniques using the ...wireless video telephony and characterise its performance when communicating over the UTRA wideband vehicular fading ...
5
HIPERLAN like Turbo Coded Multi user Detection Assisted OFDM Based Interactive Video Telephony
... Abstract— Multiuser detection assisted, multiple transmit antenna based OFDM arrangements are studied in the context of HIPERLAN 2-like sys- tems. It is demonstrated that the system’s user capacity can be improved with ...
5
Interactive Cellular and Cordless Video Telephony: State of the Art System Design Principles and Expected Performance
... the video datastream has to be demodulated and FEC decoded in order to check whether there were er- rors in the video stream, since this event has to be signaled in the next transmission burst to the ...
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Error Rate Based Power controlled Multimode H 263 Assisted Video Telephony
... When there is no power control, the average transmit- ted power is identical to the fixed power of each portable. When using power control, the average transmitted power required for maintaining an FER of 5% and, hence, ...
13
Turbo and BCH Coded Wide Band Burst by Burst Adaptive H 263 Assisted Wireless Video Telephony
... decoded video quality, measured in terms of the peak SNR ...decoded video quality in terms of PSNR versus channel SNR for both the ideal and realistic adaptive modem, and for the four modes of the ...
9
Burst by Burst Adaptive Decision Feedback Equalised TCM, TTCM and BICM for H 263 Assisted Wireless Video Telephony
... as video, speech, or audio quality by automatically adjusting the achievable bit rate and the associated multimedia source-signal representation quality in order to match the channel quality ...adaptive ...
12
Subband adaptive turbo coded OFDM based interactive video telephony
... digital video broadcasting [14], [15] (DVB) as well as for high-rate Wireless Asynchronous Transfer Mode (WATM) systems due to its ability to combat the effects of highly dispersive channels ...
11
Burst by Burst Adaptive Turbo coded OFDM Based Video Telephony
... Figure 4: Frame Error Rate FER or video packet loss ratio PLR versus channel SNR for the BPSK and QPSK xed modulation mode OFDM transceivers and for the corresponding subband-adaptive AO[r] ...
5
Near Instantaneously Adaptive Decision Feedback Equalized Coded Modulation for Wireless Video Telephony
... decoded video quality, measured in terms of the video peak signal to noise ratio (PSNR) versus time for the CIF resolution “Salesman” sequence for each of the four fixed modulation modes using the TTCM ...
5
Burst by Burst Adaptive Wireless Video Telephony over Dispersive Channels
... Figure 7: Video bitrate versus channel SNR comparison for the adaptive burst-by-burst modem AQAM with a realistic one TDMA frame delay between channel estimation and mode switching for t[r] ...
5
Burst by Burst Adaptive Joint Detection CDMA/H2 63 Based Video Telephony
... the video quality quantified in terms of PSNR is portrayed in ...the video quality degrades as the PLR ...of video quality as the channel SNR reduced, the best policy was to switch to a more robust ...
7
Multi Mode Joint Detection CDMA/H 263 Based Video Telephony
... Figure 6: Video packet loss ratio versus channel SNR for the turbo-coded 11.1 Kbps video stream, comparing the performance of matched ltering and joint detection for 2{8 users.. Therefor[r] ...
6
Volume 37: Kommunikation in Verteilten Systemen 2011
... Die Abb. 2 verdeutlicht, dass der Verbindungsaufbau sehr übersichtlich und kurz ist. Man sieht, dass zwei Duplex RTP-Sessions eröffnet werden, eine für Video- und die zweite für Audioübertragung. In der ...
12
A survey of requirements and standardization efforts for IP telephony security
... - Quality of service is a major concern for realtime IP-Telephony services. It must match or exceed that of PSTNs [13]. Different measures should be considered. The call setup delay is one significant aspect. The ...
11
Computer Telephony Demystified pdf
... A fact often overlooked is that a CT system serves not only its owner, but also—just as importantly—those who interact with the owner through the telephone. Whether the CT system in question is in a home, small business, ...
836
NexPath Telephony Server User’s Guide
... NexPath Telephony Server simply passes these key presses on to the other ...NexPath Telephony Server that you want to do something special like put a call on hold once you are in the middle of a ...
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