Adaptive-Truncated-HARQ-Aided Layered Video Streaming Relying on Interlayer FEC Coding

Abstract

Abstract-Inter-layer forward error correction coding (IL-FEC) constitutes an effective unequal error protection (UEP) scheme conceived for transmitting layered video over wireless channels. In contrast to traditional UEP schemes, it operates by embedding extra information concerning the base layer (BL) into the enhancement layers (ELs) without requiring extra transmission resources. The received EL packets assist in the decoding of the BL in order to reduce the distortion of the reconstructed video. The optimum scheduling of the IL-FEC coded layered video streaming in a truncated HARQ (THARQ) aided system is an open problem. Hence in this treatise, we conceive an adaptive THARQ (ATHARQ) algorithm for finding the most appropriate scheduling of the IL-FEC coded layered video packets for the sake of minimizing the video distortion under the constraint of a given total number of transmission time slots. Furthermore, we develop a method of on-line coding-rate optimization algorithm for our IL-ATHARQ transmission scheme, in order to find the best FEC code rate distribution among the video layers that results in the lowest possible video distortion. When using a recursive systematic convolutional (RSC) code, our simulation results show that the proposed rate-optimized IL-ATHARQ system outperforms the traditional THARQ transmission scheme by about 5.3 dB of E b /N0 at a peak signal-to-noise ratio (PSNR) of 38.5 dB. Viewing the improvements in terms of the video quality, 2.5 dB of PSNR improvement is attained at an E b /N0 of 15 dB.

Energy Optimization For Wireless Video Transmission Employing Hybrid ARQ

“…The maximum number of transmissions is changed based on the importance of the packet for LTE networks in [34], [35]. The authors in [36] considered interlayer FEC and HARQ, and found the best FEC code rate distribution among the video layers to minimize the video distortion. In [37], retransmissions are used for the base layer to reduce network congestion.…”

Hierarchical Colour-Shift-Keying Aided Layered Video Streaming for the Visible Light Downlink

“…Reed-Solomon (RS) codes or Luby transform (LT) codes are invoked for mitigating the packet loss events at the application layer [67]. By contrast, the bit-level arrangements operate at the physical layer and rely on soft-decoded FEC codes for correcting bit-errors in wireless scenarios [47], [68], [69]. Specifically, the authors of [47] proposed a bit-level inter-layer coded FEC (IL-FEC) scheme that embeds the BL into the FEC coded ELs, so that the reception of the BL can be improved with the aid of the ELs using soft decoding.…”

Streaming High-Definition Real-Time Video to Mobile Devices with Partially Reliable Transfer

“…Second, the FEC solutions [14][15][16][17][18] provide a certain level of reliability but also induce higher bandwidth consumption (e.g., 20 − 50% redundancy) and larger coding latency. Third, the HARQ (Hybrid ARQ) methods [30] [46] are conventionally plagued with the deficiencies of both FEC and ARQ schemes. Thus, the real-time and reliability performance of the existing error-control solutions are still inadequate to achieve excellent real-time video quality.…”