Title :
A low complexity carrier recovery and frequency estimation algorithm for Iridium handset system
Author :
Hwang, Syang-Myau ; Yu, Mao ; Yang, Lin
Author_Institution :
Cadence Design Syst. Inc., San Jose, CA, USA
Abstract :
This paper presents a low complexity carrier recovery and frequency estimation algorithm tailored for Iridium satellite communication handset system. The algorithm can acquire carrier frequency from large Doppler offset (larger than symbol rate) in short preamble period and track carrier frequency and phase for the rest of the TDMA slot. It also accurately estimates Doppler offset at the end of the slot. This final Doppler estimation value is further used in upper layer and satellite for Doppler prediction and pre correction. Simulation results show that with at ±37.5 KHz Doppler frequency offset at 4.5 db Eb/Na, the estimated Doppler frequency error and standard deviation is less than 1 Hz, and 3 Hz, respectively
Keywords :
Doppler effect; computational complexity; frequency estimation; mobile satellite communication; synchronisation; time division multiple access; Doppler frequency error; Doppler frequency offset; Doppler prediction; Iridium satellite communication handset system; TDMA slot; carrier frequency; final Doppler estimation value; frequency estimation algorithm; large Doppler offset; low complexity carrier recovery; pre correction; short preamble period; simulation; standard deviation; Algorithm design and analysis; Artificial satellites; Automatic frequency control; Frequency estimation; Low earth orbit satellites; Phase locked loops; Propagation delay; Satellite communication; Signal to noise ratio; Telephone sets;
Conference_Titel :
Wireless Communications and Networking Conference, 1999. WCNC. 1999 IEEE
Conference_Location :
New Orleans, LA
Print_ISBN :
0-7803-5668-3
DOI :
10.1109/WCNC.1999.796927
