The Design Of Multicarrier Baseband Sending Circuit With Image Perception

With the people's increasing demand for multimedia data,such as picture,audio and vedio,wireless multimedia sensor network technology increasingly affect people's lives.Wireless image transmission technology has a vast potential for future development,therefore the multicarrier baseband sending circuit with image perception has an important practical significance.Domestic and foreign academic institutions have conducted in-depth research on it.They push technology forward,and face many challengesat the same time,such as image reconstruction of the peak signal to noise ratio is not high,the wireless transmission speed is slow and so on.Based on the analysis of the research status at home and abroad,aiming at the shortcomings of the current wireless image transmission system,the index of the wireless image transmission system are determined in this thesis.A problem was found that constructing the sparse vector after multi-layer discrete wavelet transform is not well.A solution has been proposed to overcome it.Dividing the column vector after Kalra and Qureshi construction algorithm into groups on average,and scheme extracts the vector from the different groups of vectors at the same position to form a longer new vector.The simulation shows that this solution can effectively improve the peak signal to noise ratio of the image.After constructing the orthogonal frequency division multiplexing(OFDM)baseband simulation platform,the simulation shows that the design of baseband meet the index requirements.After the completion of the algorithm simulation,the circuit modules were optimally designed and the function simulation was completed by Modelsim.A FPGA verification platform has been-set up to finishe the verification work for the circuit.The result of circuit synthesis shows that the design of image perception module has the characteristic of low circuit complexity and occupy less hardware resources.And comparing the data from the oscilloscope and Matlab,the result proves that the function of the circuit is correct and the RTL code can be synthesizable.Under the condition that the signal to noise ratio is 10.0 dB,the circuit system test shows that the peak signal to noise ratio is greater than 30.0 db for the image perception module and the bit error rate of the wireless transmission module reaches 10-6.The designed circuit meets the requirements of the index.