Abstract
In this research work, we have presented an iterative joint source channel decoding- (IJSCD-) based wireless video communication system. The anticipated transmission system is using the sphere packing (SP) modulation assisted differential space-time spreading (DSTS) multiple input-multiple output (MIMO) scheme. SP modulation-aided DSTS transmission mechanism results in achieving high diversity gain by keeping the maximum possible Euclidean distance between the modulated symbols. Furthermore, the proposed DSTS scheme results in a low-complexity MIMO scheme, due to nonemployment of any channel estimation mechanism. Various combinations of source bit coding- (SBC-) aided IJSCD error protection scheme has been used, while considering their identical overall bit rate budget. Artificial redundancy is incorporated in the source-coded stream for the proposed SBC scheme. The motive of adding artificial redundancy is to increase the iterative decoding performance. The performance of diverse SBC schemes is investigated for identical overall code rate. SBC schemes are employed with different combinations of inner recursive systematic convolutional (RSC) codes and outer SBC codes. Furthermore, the convergence behaviour of the employed error protection schemes is investigated using extrinsic information transfer (EXIT) charts. The results of experiments show that our proposed R a t e − 2 / 3 SBC-assisted error protection scheme with high redundancy incorporation and convergence capability gives better performance. The proposed R a t e − 2 / 3 SBC gives about 1.5 dB E b / N 0 gain at the PSNR degradation point of 1 dB as compared to R a t e − 6 / 7 SBC-assisted error protection scheme, while sustaining the overall bit rate budget. Furthermore, it is also concluded that the proposed R a t e − 2 / 3 SBC-assisted scheme results in E b / N 0 gain of 24 dB at the PSNR degradation point of 1 dB with reference to R a t e − 1 SBC benchmarker scheme.
Highlights
Multimedia communication systems require high data rate, which results in high demand for transmission power and available bandwidth
15 64 11 9 3 recursive systematic convolutional (RSC) 1⁄2 differential space-time spreading (DSTS) sphere packing (SP) (L = 16) 2 1 Walsh code 8 4 Correlated Rayleigh fading 0.01 frame is divided into nine segments, and every segment consists of a row of 11 MBs within each quarter common intermediate format (QCIF) frame
The performance of different diverse-rated source bit coding (SBC) outer-coding schemes was investigated in combination with RSC inner codes, while keeping the overall bit rate budget constant
Summary
Multimedia communication systems require high data rate, which results in high demand for transmission power and available bandwidth. Predictive coding technique and variable-length coding (VLC) increase the H.264/AVC codec compression efficiency required for transmission system, but it makes the transmitted bitstream more prone to the error [2]. A transmission system with reversible variable-length codes (RVLC) using irregular convolutional codes (IRCC) that helps in compressing and protecting video codec and uses maximum a posteriori (MAP) algorithm for decoding is discussed in [5]. In [7], the authors have discussed the decrease in energy cost for the communication systems over the wireless channel through an orthogonal coding scheme. STC has different coding matrix for multiple inputmultiple output (MIMO) transmission, but STBC4 algorithm due to maximum clock transmission steps gives a better peak signal-to-noise ratio (PSNR) and bit error rate (BER).
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