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This algorithm can remove the effect of BeiDou NH code effectively and weaken the influence of frequency deviation. The results show that the proposed algorithm outperforms the traditional method with a frequency deviation of 50 Hz. Finally, Monte Carlo simulations are conducted to analyze the detection performance of the proposed algorithm compared with a traditional algorithm under the CN0s of 20~40 dB-Hz and different frequency deviations.
Secondly, the maximum likelihood function detection is used to improve the detection probability of weak signals. Firstly, a differential coherent approach is used to remove the effect of frequency deviation, and the differential delay time is set to be a multiple of bit cycle to remove the influence of NH code. In order to realize bit synchronization for BeiDou weak signals with large frequency deviation, a bit synchronization algorithm based on differential coherent and maximum likelihood is proposed. Therefore, a bit synchronization algorithm is necessary to obtain bit edges and NH code phases. Han, Zhifeng Liu, Jianye Li, Rongbing Zeng, Qinghua Wang, YiīeiDou system navigation messages are modulated with a secondary NH (Neumann-Hoffman) code of 1 kbps, where frequent bit transitions limit the coherent integration time to 1 millisecond. (semiconductor integrated circuits)Ī Modified Differential Coherent Bit Synchronization Algorithm for BeiDou Weak Signals with Large Frequency Deviation. With a 4.9 MHz sine wave input, the prototype ADC implemented in a 0.18-, demonstrates a maximum signal-to-noise distortion ratio (SNDR) and SFDR of 66.32 and 83.38 dB, respectively, at a 4.9 MHz analog input and a power consumption of 102 mW from a 1.8 V supply.
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This paper describes a 12- bit 40 MS/s calibration-free pipelined analog-to-digital converter (ADC), which is optimized for high spurious free dynamic range (SFDR) performance and low power dissipation. Wei Qi Yin Xiumei Han Dandan Yang Huazhong, E-mail: [Department of Electronic Engineering, Tsinghua University, Beijing 100084 (China)
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