Title :
OFDM Blind Parameter Identification in Cognitive Radios
Author :
Ishii, Hiroyuki ; Wornell, Gregory W.
Author_Institution :
Massachusetts Inst. of Technol., Cambridge, MA
Abstract :
In this paper we introduce a blind parameter identification algorithm for orthogonal frequency division multiplexing (OFDM) signals. The algorithm correlation-based processes automatically estimate all parameters of OFDM signals with a blind process that works from a limited amount of data without any prior information. We also derive novel identification performances of algorithms under various conditions, assuming actual conditions in feasible systems: data offset, AWGN, frequency offset, and fading channels. The algorithm is essential for two systems: first, cognitive radios, one of the most exciting being radios that change fundamental parameters frequently to provide high throughput and high quality of services; and, second, radio monitoring systems that detect illegal signals transmitted by unlicensed devices
Keywords :
AWGN channels; OFDM modulation; fading channels; quality of service; AWGN; OFDM blind parameter identification; algorithm correlation-based processes; cognitive radios; data offset; fading channels; frequency offset; orthogonal frequency division multiplexing; quality of services; radio monitoring systems; AWGN; Change detection algorithms; Cognitive radio; Fading; OFDM; Parameter estimation; Quality of service; Radiofrequency identification; Signal processing; Throughput; Blind processes; Cognitive Radios; OFDM systems; Parameter identifications; Radio monitoring;
Conference_Titel :
Personal, Indoor and Mobile Radio Communications, 2005. PIMRC 2005. IEEE 16th International Symposium on
Conference_Location :
Berlin
Print_ISBN :
9.7838007291e+012
DOI :
10.1109/PIMRC.2005.1651526