Title :
Use of wavelet transforms for the delay detection of a new user entering a CDMA communications system
Author :
Casal, Carlos Rodriguez ; Santos, Angel M Bravo ; Bhargava, Vijay K.
Author_Institution :
Dept. de Ingenieria Electr. y Electron., Univ. Publica de Navarra, Spain
Abstract :
In this paper the problem of estimating the delay of a new user entering the system is studied. A receiver structure is proposed for the estimation of the transmission delay of the new user, and different structures are used to implement the de-noising algorithms. The detector presented solves the problem of detecting the presence of a new user by making the determination of the difference between the received signal and the expected signal, knowing the previous users. This difference is then used to provide the delay of the new user using a structure based on the performance of the correlation between this difference and a reference signal. This structure will be improved with different de-noising possibilities
Keywords :
code division multiple access; delays; estimation theory; interference suppression; mobile satellite communication; radio receivers; radiofrequency interference; wavelet transforms; CDMA communications system; correlation; de-noising algorithms; delay detection; expected signal; new user; performance; received signal; receiver structure; transmission delay; wavelet transforms; Base stations; Decorrelation; Delay effects; Delay estimation; Detectors; Multiaccess communication; Noise reduction; Propagation delay; Satellites; Wavelet transforms;
Conference_Titel :
Personal Wireless Communications, 1997 IEEE International Conference on
Conference_Location :
Mumbai
Print_ISBN :
0-7803-4298-4
DOI :
10.1109/ICPWC.1997.655474
