Mixed-digital-analog video transmission scheme based on recursive distortion estimation in wireless relay system
A distortion estimation and wireless relay technology, applied in the field of video transmission, can solve problems such as reducing system efficiency, not considering channel fading, and not being able to represent channel fading
Active Publication Date: 2021-02-12
ZHONGBEI UNIV +1
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Problems solved by technology
[0006] Most of the current HDA schemes have two limitations: First, the current schemes almost assume that the digital part is transmitted without distortion, which brings great difficulties to practical applications. For example, in order to ensure the distortion-free transmission of the digital part, a Allocate a strong transmit power to the digital part or use high bit rate channel coding, which will greatly reduce the efficiency of the entire system
The second is to assume that the superimposed signal is transmitted in a Gaussian channel without considering channel fading. However, this assumption cannot represent the fading phenomenon that exists in the actual transmission channel
In addition, the current HDA has hardly considered the video transmission scheme in the wireless relay system
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[0065] The mixed digital analog video transmission scheme based on recursive distortion estimation in the wireless relay environment proposed by the present invention and the adaptive power allocation algorithm for this scheme are realized by MATLAB software simulation, figure 1 Shown is the transmission channel model diagram of the present invention. The sending end S transmits the video to the relay end through the mixed-digital-analog video transmission HDA scheme, and at the same time obtains the expected distortion of the scheme through the recursive distortion estimation algorithm, and obtains the optimal power allocation factor of the digital-analog part in HDA through the traversal method , the HDA digital and analog signals are optimized for power distribution and then transmitted to the destination. In this invention, we default that the relay can receive the information from the sender without error. After receiving the transmission signal, the relay decodes it tran...
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The invention belongs to the technical field of video transmission methods, and in particular relates to a mixed-mode video transmission scheme based on recursive distortion estimation in a wireless relay system. Aiming at a wireless Rayleigh fading channel with a relay, the HDA video transmission scheme is studied, and the number of HDA is not limited. For signal transmission without distortion, first deduce the video transmission distortion model using HDA in the Rayleigh fading relay system, and then based on this model, optimize the power distribution of HDA digital and analog signals, on the basis of overcoming the traditional cliff effect and quality saturation effect The main feature of this scheme is that according to the characteristics of the transmission channel, the sending end S estimates the end-to-end distortion model of the HDA encoded video from the source end to the receiving end, including HDA video encoding, power allocation, relay Decoding and forwarding at the end, channel transmission, decoding and recovery at the receiving end, etc., by selecting the optimal power allocation factor to achieve better video restoration quality.
Description
technical field [0001] The invention belongs to the technical field of video transmission methods, and in particular relates to a mixed digital mode transmission scheme based on recursive distortion estimation in a wireless relay system and an adaptive power allocation algorithm for the scheme. Background technique [0002] Wireless video transmission is more and more widely used, but there are still problems such as channel fading and serious packet loss, which affect the restored video quality. Relay transmission technology improves the quality and reliability of communication by assisting communication, so research on wireless transmission technology combined with relay will help to obtain better video transmission effects. [0003] The traditional wireless relay system transmits video through digital transmission, that is, first compresses the video into a binary code stream (Bitstream) with a standard coding algorithm, and then digitally modulates the binary code stream...
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IPC IPC(8): H04N7/18H04B17/391H04B17/382H04B17/336H04N19/177
CPCH04N7/18H04N19/177H04B17/336H04B17/382H04B17/391
Inventor 李沛豪杨风暴范志成张静王安红
Owner ZHONGBEI UNIV