Image wireless transmission energy consumption minimization method based on unequal error protection (UEP) policy

Abstract

The invention provides an image wireless transmission energy consumption minimization method based on an unequal error protection (UEP) policy in a frequency selective channel, which relates to an image wireless transmission system. In view of the image transmission problem in the frequency selective fading channel and in combination with characteristics of OFDM wireless communication, the invention provides the whole image wireless transmission energy consumption minimization method based on the UEP policy. Firstly, transmission energy consumption during a process of transmitting all image data frames by an OFDM system is analyzed, and distortion caused by error bits in the image data frame transmission is analyzed; on the basis, through distributing different transmission powers for different image data frame parts and through selecting a channel, different data frame parts are matched to different channels; and in a condition of meeting a certain quality constraint, the total system energy needed by whole image wireless transmission is minimized. The method of the scheme consumes less energy.

Description

technical field [0001] The invention relates to the field of wireless image transmission, in particular to a transmission scheme of an OFDM system. Background technique [0002] The transmission of multimedia data such as images generally requires a larger bandwidth and rate. High-speed broadband wireless transmission is more likely to be affected by inter-symbol interference and frequency selective fading. OFDM technology can well solve inter-symbol interference in high-speed transmission. Broadband The frequency selective channel is divided into many narrowband flat fading channels, thereby improving the efficiency of spectrum utilization. OFDM is Orthogonal Frequency Division Multiplexing technology. Its basic principle is to divide the channel into several two-two mutually orthogonal sub-channels through the orthogonal separation technology at the sending end, and convert the high-speed data stream to these sub-channels through serial-to-parallel conversion. Low-speed t...

AI Technical Summary

Problems solved by technology

The existing energy-efficient wireless transmission methods for images based on UEP mainly have two deficiencies: on the one hand, in the literature [Alajel K M, XiangWei, Wang Yafeng. Unequal error protection scheme based hierarchical 16-QAM for3-D video transmission [J] .IEEE Transactions on Consumer Electronics,2012,58(3):731-738.] and literature [Tang Zhenhua, Qin Tuanfa, Liu Wenyu. Energy-minimized adaptive resource allocation for image transmission over wireless channel[C] / / 2010 International Conference on Intelligent Control and Information Processing (ICICIP).Dalian:IEEE Press,2010:398-403.], the transmission system uses complex error correction coding to channel code the data, this method reduces distortion, but consumes more energy consumption, and reduces the effective data transfer rate

Both methods do not consider the error suppression of the coded image data stream. Since the compressed code stream adopts variable-length coding, errors are easy to spread in the code stream, which in turn affects the decoding of subsequent coefficients.

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