DCT domain filtering method for multi-antenna code acquisition  

作　　者：Xiaojie Li Luping Xu Shibin Song Hua Zhang 

机构地区：[1]School of Electronic Engineering, Xidian University

出　　处：《Journal of Systems Engineering and Electronics》2013年第5期734-741,共8页系统工程与电子技术（英文版）

基　　金：supported by the National Natural Science Foundation of China(61172138);the Natural Science Basic Research Plan in Shaanxi Province of China(2013JQ8040);the Fundamental Research Funds for the Central Universities(K5051302015;K5051302040)

摘　　要：For global navigation satellite system （GNSS） signals in Gaussian and Rayleigh fading channel, a novel signal detection algorithm is proposed. Under the low frequency uncertainty case, after performing discrete cosine transform （DCT） to the outputs of the partial matched filter （PMF） for every antenna, the high order com- ponents in the transforming domain will be filtered, then the equalgain （EG） combination for the inverse discrete cosine transform （IDCT） reconstructed signal would be done subsequently. Thus, due to the different frequency distribution characteristics between the noise and signals, after EG combination, the energy of signals has almost no loss and the noise energy is greatly reduced. The theoretical analysis and simulation results show that the detection algorithm can effectively improve the signal-to-noise ratio of the captured signal and increase the probability of detection under the same false alarm probability. In addition, it should be pointed out that this method can also be applied to Rayleigh fading channels with moving antenna.For global navigation satellite system （GNSS） signals in Gaussian and Rayleigh fading channel, a novel signal detection algorithm is proposed. Under the low frequency uncertainty case, after performing discrete cosine transform （DCT） to the outputs of the partial matched filter （PMF） for every antenna, the high order com- ponents in the transforming domain will be filtered, then the equalgain （EG） combination for the inverse discrete cosine transform （IDCT） reconstructed signal would be done subsequently. Thus, due to the different frequency distribution characteristics between the noise and signals, after EG combination, the energy of signals has almost no loss and the noise energy is greatly reduced. The theoretical analysis and simulation results show that the detection algorithm can effectively improve the signal-to-noise ratio of the captured signal and increase the probability of detection under the same false alarm probability. In addition, it should be pointed out that this method can also be applied to Rayleigh fading channels with moving antenna.

关 键 词：ACQUISITION DETECTION FADING discrete cosine transform （DCT） partial matched filter （PMF） probability of false alarm probability of detection. 

分 类 号：TN967.1[电子电信—信号与信息处理] TN713[电子电信—信息与通信工程]