By Haohong Wang, Lisimachos Kondi, Ajay Luthra, Song Ci
A finished presentation of the video communique ideas and platforms, this ebook examines 4G instant structures that are set to revolutionise ubiquitous multimedia communication.4G instant Video Communications covers the elemental thought and appears at platforms descriptions with a spotlight on electronic video. It addresses the foremost subject matters linked to multimedia verbal exchange on 4G networks, together with complicated video coding criteria, errors resilience and blunder concealment innovations, in addition to complex content-analysis and version ideas for video communications, cross-layer layout and optimization frameworks and techniques. It additionally presents a high-level assessment of the electronic video compression common MPEG-4 AVC/H.264 that's anticipated to play a key position in 4G networks. fabric is gifted logically permitting readers to show on to particular attractions. the 1st 1/2 the ebook covers basic conception and structures, whereas the second one part strikes onto complicated innovations and purposes. This ebook is a well timed mirrored image of the most recent advances in video communications for 4G instant platforms.
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To characterize the channel variation, it is very important to know the distribution of SNR and the autocorrelation function, which are widely used 21 Characteristics and Modeling of Wireless Channels in adaptive modulation and coding. 4) where v is the velocity of the mobile user and λ is the wavelength of RF. There are two classical channel models, the Jakes model and Markov channel model , which are widely adopted in the research work on adaptive modulation and coding. In , narrow-band Rayleigh fading is generated by adding a set of six or more sinusoidal signals with predetermined frequency offsets.
Two years later, MPEG-2 was designed so as to provide the coding and transmission of high quality, multi-channel and multimedia signals over terrestrial broadcast, satellite distribution and broadband networks. The concept of ‘profiles’ and ‘levels’ was first introduced in MPEG-2 in order to stipulate conformance between equipment that does not support full implementation. , image size, frame rate and bit rates). MPEG-2 supports the coding and processing of interlaced video sequences, as well as scalable coding.
For a given sinusoid waveform, there are three waveform attributes: amplitude, phase, and frequency. Therefore, there are three major modulation schemes: Amplitude Shift-Keying (ASK), Phase Shift-Keying (PSK) and Frequency Shift-Keying (FSK). In ASK, the appearance of a carrier waveform represents a binary ‘1’ and its absence indicates a binary ‘0’: s0 (t) = 0 and s1 (t) = cos(2πfc t) where s0 (t) is the modulated signal for bit ‘0’ and s1 (t) is for bit ‘1’ and fc is the carrier frequency. ASK usually works with some other modulation scheme such as PSK in order to form a new modulation scheme called quadrature amplitude modulation (QAM) for higher channel utilization.
4G wireless video communications by Haohong Wang, Lisimachos Kondi, Ajay Luthra, Song Ci