With the rapid development of wireless network and multimedia technology, the efficient transmission over unreliable channel is becoming more and more important. The error control technique for video coding and transm...
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ISBN:
(纸本)9781509017812
With the rapid development of wireless network and multimedia technology, the efficient transmission over unreliable channel is becoming more and more important. The error control technique for video coding and transmission has drawn considerable attention, tries to recover the data loss and bit errors due to congestion or physical channel fading. Currently, there are three kinds of error control schemes, namely, error resilient coding at the encoder, error concealment at the decoder and the retransmission in the transport layer. In this paper, an error control scheme is proposed which uses the soft information in channeldecoding to recover the corrupted bit stream. When bit error is detected in a slice, soft information of channeldecoding is employed to locate it, and the wrong bits are flipped and decoded again at the beginning of the slice. The combination of XOR at source and the syntax checking of H.264 decoder has increased the error detection rate from around 60% to 99% without increasing source redundancy. Simulation results show that, when the same error concealing algorithm is used, the PSNR of the proposed scheme using soft information of channeldecoding at the decoder is 1-2dB higher than that using the traditional method.
In this paper we are interested to the decoding of blocks turbo codes constructed from Reed Solomon (RS) codes. We have modified the iterative algorithm proposed by Chase in order to exploit the a priori information p...
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ISBN:
(纸本)9781538621233
In this paper we are interested to the decoding of blocks turbo codes constructed from Reed Solomon (RS) codes. We have modified the iterative algorithm proposed by Chase in order to exploit the a priori information provided by a correlated source. Indeed, some sources such as images have a strong correlation. A simple iterative decoding algorithm does not take this feature into account. The choice of using RS turbo codes has an advantage compared to the BCH turbo codes when we focus on the example of the image, which is a good representative of correlated sources. A bijection between the pixels of the image and the symbols of the codes will be considered to introduce the bidirectional correlation in the iterative decoding of the rows and columns. Simulation results show that a significant performance gain is obtained with this type of decoding, compared to a classical RS turbo decoding, in case of correlated source and also in case of image transmission.
With the rapid development of wireless network and multimedia technology,the efficient transmission over unreliable channel is becoming more and more *** error control technique for video coding and transmission has d...
详细信息
With the rapid development of wireless network and multimedia technology,the efficient transmission over unreliable channel is becoming more and more *** error control technique for video coding and transmission has drawn considerable attention,tries to recover the data loss and bit errors due to congestion or physical channel ***,there are three kinds of error control schemes,namely,error resilient coding at the encoder,error concealment at the decoder and the retransmission in the transport *** this paper,an error control scheme is proposed which uses the soft information in channeldecoding to recover the corrupted bit *** bit error is detected in a slice,soft information of channeldecoding is employed to locate it,and the wrong bits are flipped and decoded again at the beginning of the *** combination of XOR at source and the syntax checking of H.264 decoder has increased the error detection rate from around 60%to 99%without increasing source *** results show that,when the same error concealing algorithm is used,the PSNR of the proposed scheme using soft information of channeldecoding at the decoder is 1-2dB higher than that using the traditional method.
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