A protection scheme for multimedia packet streams in bursty packet loss networks based on small block low-density parity-check codes

Abstract

This paper proposes an enhanced forward error correction (FEC) scheme based on small block low-density parity-check (LDPC) codes to protect real-time packetized multimedia streams in bursty channels. The use of LDPC codes is typically addressed for channels where losses are uniformly distributed (memoryless channels) and for large information blocks. This work suggests the use of this type of FEC codes at the application layer, in bursty channels (e.g., Internet protocol (IP)-based networks) and for real-time scenarios that require low transmission latency. To fulfil these constraints, the appropriate configuration parameters of an LDPC scheme have been determined using small blocks of information and adapting the FEC code to be capable of recovering packet losses in bursty environments. This purpose is achieved in two steps. The first step is performed by an algorithm that estimates the recovery capability of a given LDPC code in a burst packet loss network. The second step is the optimization of the code: an algorithm optimizes the parity matrix structure in terms of recovery capability against the specific behavior of the channel with memory. Experimental results have been obtained in a simulated transmission channel to show that the optimized LDPC matrices generate a more robust protection scheme against bursty packet losses for small information blocks.

Error Control Mechanism Based on Reed-Solomon Code for Wireless Networks

“…Similarly, in [17], another application layer FEC method is proposed based on small block low-density parity-check (LDPC) codes to protect real-time packetized multimedia streams in bursty channels. Although the scheme considers the wireless channel characters, it can only be used at the application layer for video file.…”

“…In the wireless channel model, we suppose the channel will be in one of the two states: bad state (B) and good state (G) [17], as shown in Figure 16. The bit error rate is low in good state, so both the RS code and our improved RS code can correct the error bits.…”

Error Control Mechanism Based on Reed-Solomon Code for Wireless Networks

“…It was inadequate to cope with the drastic changes in network status. Similarly, in [17],another application layer FEC method is proposed based on small block low-density parity-check (LDPC) codes to protect real-time packetized multimedia streams in bursty channels. Although the scheme considers the wireless channel characters, it can only be used at the application layer for video file.…”

Video over DSL with LDGM Codes for Interactive Applications

“…An algorithm to improve the LDGM matrix H is detailed in [28]. In this paper we informally outline the algorithm and compare error recovery with the improved LDGM matrix against original LDGM.…”