Results 231 to 240 of about 72,590 (262)
Some of the next articles are maybe not open access.
Pseudo analog video transmission based on LTE physical layer
2016 IEEE/CIC International Conference on Communications in China (ICCC), 2016The existing wireless video transmission scheme has the cliff effect. When signal to noise ratio is lower than the decoding threshold, the video quality drops dramatically. Recently, a novel approach called SoftCast has shown the characteristics of overcoming cliff effect, but it has never been integrated into a universal communication system.
Zhuang Ding +4 more
openaire +1 more source
Hybrid digital-analog scheme for video transmission over fading channel
2016 IEEE International Symposium on Circuits and Systems (ISCAS), 2016In this paper, we consider video communication over fading channel, where the perfect instantaneous channel state information (CSI) is available at both sender and receiver. Most of existing coding schemes are inefficient in this communication scenario. The reason is that for digital coding scheme, it has high coding efficiency but unavoidably leads to
Jian Shen, Lei Yu, Houqiang Li
openaire +1 more source
Transmission of Analog Video and Digital Signals Over Analog-Repeatered Coaxial Lines
IEEE Transactions on Communications, 1976The transmission of digital telephony or data, alone and together with analog video, over analog-repeatered coaxial-cable lines is discussed. Expressions for the total random noise power and the signal-to-noise ratio (SNR) are derived. These expressions include the effects of thermal noise and the intermodulation distortion due to nonlinearity in the ...
openaire +1 more source
Linearization of a light emitting diode for analog baseband video transmission
Electronics and Communications in Japan (Part II: Electronics), 1986AbstractNonlinearity compensation is very important when using an LED source for video transmission. In general, wideband negative optoelectronic feedback makes a high‐quality, low‐distortion, adjustment‐free light source possible. However, when attempting to apply this technique to the LED, a stable feedback loop design is difficult to achieve because
Masaru Nakamura +4 more
openaire +1 more source
Coherent analog FM-SCM video transmission using direct frequency modulation of semiconductor lasers
Digest of Conference on Optical Fiber Communication, 1992The advantages of analog subcarrier-multiplexed (SCM) FM video transmission using frequency modulation of the optical carrier over other analog laser modulation schemes include the reduced impact of laser relative intensity noise and the phase noise suppression achievable in a receiver employing FM demodulation of both the subcarrier and optical ...
L. G. Kazovsky, J. C. Fan
openaire +1 more source
Residual Signals Modeling for Layered Image/Video Softcast with Hybrid Digital-Analog Transmission
2018 25th IEEE International Conference on Image Processing (ICIP), 2018Recently, the SoftCast scheme has shown great potential for robust image/video communication in wireless scenarios, where the channel quality may fluctuate drastically and unpredictably. However, the analog-like transmission in Soft-Cast is not always efficient in terms of power usage, compared with digital approaches.
Jing Zhao, Jiyu Xie, Ruiqin Xiong
openaire +1 more source
Study of a Raman Crosstalk Management Technique for Analog Video RF Signal Transmission Systems
2006 International Topical Meeting on Microwave Photonics, 2006When analog terrestrial broadcasting and Gigabit Ethernet signals co-exist in the same network, the Raman crosstalk effect might damage the analog video signal. In this paper, we have investigated the effectiveness of adding some dispersion at the input-end of the fiber to manage the Raman crosstalk and successfully demonstrated adequate suppression of
Ayako Murakami +2 more
openaire +1 more source
2014 IEEE International Conference on Multimedia and Expo (ICME), 2014
Due to the mobility of transceivers and the interference from other signals, the condition of a wireless channel may vary drastically and unpredictably. In such scenario, conventional communication systems usually suffer from cliff effect due to the nature of entropy coding and channel coding.
Zhihai Song +4 more
openaire +1 more source
Due to the mobility of transceivers and the interference from other signals, the condition of a wireless channel may vary drastically and unpredictably. In such scenario, conventional communication systems usually suffer from cliff effect due to the nature of entropy coding and channel coding.
Zhihai Song +4 more
openaire +1 more source
Digital-Analog Superposition Coding for Ofdm Channels with Application To Video Transmission
2018 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), 2018A new approach to hybrid digital-analog (HDA) video transmission over orthogonal frequency division multiplexing (OFDM) channels is presented. The goal is to achieve the best video quality by optimal power allocation, when the OFDM sub-channels have unequal and time-varying signal-to-noise ratios (SNR). In this method, the quantization error of a video
openaire +1 more source
Intensity noise of semiconductor laser diodes in fiber optic analog video transmission
IEEE Journal of Quantum Electronics, 1983This paper presents an investigation of the effects of laser diode noise on analog video transmission in the HF and VHF bands, which resulted in the development of several designs of graded-index multimode fiber systems that can ignore reflection induced laser noise.
openaire +1 more source