![]() We compare the performances of this type of spatiotemporal chaotic code with those of a conventional code used frequently in digital communication, the Gold code, and demonstrate that our code is comparable or even superior to the Gold code in several key aspects: security, bit error rate, code generation speed, and the number of possible code sequences. We propose a scheme to generate binary code for baseband spread-spectrum communication by using a chain of coupled chaotic maps. Wang Xingang Zhan Meng Gong Xiaofeng Lai, C.H. International Nuclear Information System (INIS) Spread-spectrum communication using binary spatiotemporal chaotic codes ![]() The simulation results demonstrate that the performance of the Wiener filter is much better than the matched filter, and Baker code achieves higher elastographic signal-to-noise ratio (SNRe) than the short pulse in low eSNR or great depth conditions due to the increased eSNR with it. We also compare the performance of Barker code and the conventional short pulse in simulation method. Instead of using the conventional matched filter, we use the Wiener filter to decode the Barker-coded echo signal to suppress the range sidelobes. For the Baker code of length 13, the sidelobe level of the matched filter output is -22dB, which is unacceptable for ultrasound strain imaging, because high sidelobe level will cause high decorrelation noise. Barker code as a coded excitation signal can be used to improve the echo signal-to-noise ratio (eSNR) in ultrasound imaging system. In this paper, Barker code is applied to strain imaging to improve its quality. Ultrasound strain imaging is showing promise as a new way of imaging soft tissue elasticity in order to help clinicians detect lesions or cancers in tissues. ![]() Ultrasound strain imaging using Barker code ![]()
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