Title :
Code-blind reception of frequency hopped signals over multipath fading channels
Author :
Liu, Xiangqian ; Sidiropoulos, Nicholas D. ; Swami, Ananthram
Author_Institution :
Dept. of Electr. & Comput. Eng., Louisville Univ., KY, USA
Abstract :
A noncoherent reception scheme is developed for joint blind estimation of hop timing, hop frequency and direction-of-arrival (DOA) of frequency hopped signals over multipath fading channels. Based on the principle of dynamic programming and 2-dimensional harmonic retrieval, the method does not require knowledge of users´ hop codes, and it remains operational even with multiple (unknown) hop rates, frequency offsets, and asynchronism. The model is based on FSK, but the scheme is also evaluated with GMSK modulation and shown to be robust.
Keywords :
direction-of-arrival estimation; dynamic programming; fading channels; frequency estimation; frequency hop communication; frequency shift keying; harmonic analysis; minimum shift keying; multipath channels; parameter estimation; radio receivers; radio reception; spread spectrum communication; timing; DOA estimation; FHSS communications; FSK; GMSK modulation; asynchronism; blind estimation; code-blind reception; direction-of-arrival estimation; dynamic programming; frequency hopped signals; frequency hopped spread spectrum communications; frequency offset; harmonic retrieval; hop frequency estimation; hop timing estimation; multipath channels; multipath fading channels; noncoherent reception scheme; Bandwidth; Delay effects; Dynamic programming; Fading; Frequency estimation; Frequency shift keying; Maximum likelihood estimation; Parameter estimation; Spread spectrum communication; Timing;
Conference_Titel :
Acoustics, Speech, and Signal Processing, 2003. Proceedings. (ICASSP '03). 2003 IEEE International Conference on
Print_ISBN :
0-7803-7663-3
DOI :
10.1109/ICASSP.2003.1202712
