Adaptive network abstraction layer packetization for low bit rate h 264 AVC video transmission over wireless mobile networks under cross layer optimization

... adaptive H. 264/ AVC NAL packetization scheme to video transmission system over wireless mobile networks and proposes a channel adaptive H. 264/ AVC video transmission framework under cross layer optimization ... The first byte of each NALU is the header byte which indicates the data type of NALU The 1-byte NALU header has three fixed-length bit fields...

Ngày tải lên: 26/09/2015, 11:07

... the rate control The video encoder rate control is responsible for allocating the bits per frame for optimum performance At low bit rates where every bit is important, the rate control performs ... picture The adaptive rate control scheme in the H.264/ AVC is composed of two layers: the GOP layer rate control and the frame layer rate control An add...

Ngày tải lên: 20/06/2014, 22:20

... those using only single-layer coding and uniform MPSK either with or without JSCC The results are demonstrated in Figures 11 and 12 for the AWGN and Rician fading channels, respectively For the ... function of ES /NI in dB for 2-layer adaptive modulation and coding scheme for Rician fading channel with ζ = dB Fixed symbol transmission rate rS = 128 Ksps other...

Ngày tải lên: 22/06/2014, 19:20

... section The Long-Term Model for LSF Trajectories In this section, we first consider the problem of modeling the time-trajectory of a sequence of K consecutive LSF parameters These LSF parameters ... should be well suited to capture the global shape of LSF trajectories Formally, the DCM model is defined for each of the I LSF trajectories by P ωi (n) = ci,p c...

Ngày tải lên: 21/06/2014, 16:20

... as: Mukhtar et al.: An occupancy-based and channelaware multi-level adaptive scheme for video communications over wireless channels EURASIP Journal on Wireless Communications and Networking 2011 ... complex and allows real time adjustment of video frame sizes Video streaming performance was studied for the three main ARQ schemes, Stop -and- Wait, Go-back-N,...

Ngày tải lên: 20/06/2014, 21:20

... the sensing and data transmission in accordance with the PRR based time slot allocation, while the PHY layer performs adaptive modulation and coding to allow data transmission rate adaptation At ... action can be taken Sensing information can be a consideration for QoS requirements especially in multimedia application as it can assist C -UWB to dynamically allocate app...

Ngày tải lên: 21/06/2014, 11:20

... = for 802.15.4 residual channels [19] and K = 10 for 802.11 residual channels [21], and we perform all our analysis for a parameterized value of K so that the analysis is valid for Markov channels ... results for reliable transmission over a single hop Multihop results are similar and are skipped for brevity For Packet Length Optimization, we use packet sizes of 15, 20 and...

Ngày tải lên: 21/06/2014, 22:20

... RadioChannelManager ∗ rcm; RadioChannelManager PathLoss ∗ pl; ReceiverNoise ∗ rn; FastFading ∗ ff; SlowFading ∗ sf; FastFading double getFastFading() { return 1; } double getFastFading(FastFadingInfo ... return 1; } SlowFading FastFadingInfo double getSlowFading() { return 1; } double getSlowFading(SlowFadingInfo ∗ sfi) { return 1; } GroundBasedShadowing SlowFadingInfo Figure 5: Radio channel m...

Ngày tải lên: 21/06/2014, 23:20

... , , x7 ] is defined as [5] Input image X Y k f WDCT encoder Channel Output image X g Y k WDCT decoder Figure 1: WDCT-based low bit-rate block coding using image downsampling (2n + 1)kπ xn cos ... superior compression performance for low- bit-rate applications can be achieved by using WDCT in conjunction with image downsampling-based block coding Instead of using co...

Ngày tải lên: 22/06/2014, 20:20

... boundaries of DECT are maintained in mDECT-SB, so that it can coexist with existing DECT systems The presence of a signal in one or more subbands of a DECT channel will result in any DECT- compliant ... Thus, there is a problem in providing low bit-rate TDMA channels having link performance comparable with FDMA or CDMA systems In principle, therefore, while providing for...

Ngày tải lên: 22/06/2014, 22:20

... an advanced video trace framework that overcomes the outlined limitation of the existing video traces and allows for accurate prediction of the visual quality of the reconstructed video after lossy ... the existing video traces to form advanced video traces We develop quality predictors that based on the advanced video traces predict the quality of the reconstr...

Ngày tải lên: 22/06/2014, 23:20

... Proposed video and transport features for different applications with performance in terms of delay and average PSNR for different RLC-PDU loss rates and QCIF video sequence Foreman coded at 7.5 fps Video ... account multiple users in a wireless system are not further discussed For some specific video- related issues and system design of schedulers and network buffe...

Ngày tải lên: 22/06/2014, 23:20

... Processing Video presentation Video sequence Video encoder Streaming server scheduling Bit rate adaptivity by (i) stream switching (ii) temporal scalability Data Wireless network Video decoder Streaming ... compression efficiency (for an analysis of bit stream switching for streaming, see [12]) The switching predictive (SP) picture concept in H.264/ AVC [13], however, i...

Ngày tải lên: 22/06/2014, 23:20

... the effect of packet losses occurring on wireless links Cross-Layer QoS Control for Video over Ad Hoc Networks RTP-H.264 packet video delivery over ad hoc networks Finally, Section provides a ... performance compared to the other two Cross-Layer QoS Control for Video over Ad Hoc Networks Table 2: Performance comparison (in PSNR, dB) of the proposed joi...

Ngày tải lên: 23/06/2014, 00:20

... which make it suitable for video streaming, and it can be used for efficient switching among the H.264/AVC coded video streams of different qualities, to map the rate of VBR video content to ... the P-frames of the bitstream at the transition points of the original FOR function (FOR of the original bitstream without SP) Since bits per frame of the SP-frames dif...

Ngày tải lên: 20/06/2014, 22:20