Title :
A new ranging method for OFDMA systems
Author :
Minn, Hlaing ; Fu, Xianoyu
Author_Institution :
Dept. of Electr. Eng., Texas Univ., Dallas, TX, USA
fDate :
28 Nov.-2 Dec. 2005
Abstract :
We present a new initial ranging method for OFDMA systems such as IEEE 802.16a. First, a new orthogonal ranging signal design is proposed by which an efficient, low-complexity multi-user ranging signal detection is developed. Based on the ranging signal detector results, power estimation for the detected ranging subscriber stations is performed. Then, by utilizing the proposed orthogonal ranging signal design together with the redundancy introduced by cyclic prefixes, a new iterative multi-user timing offset estimator is presented. Compared with the existing methods utilizing the CDMA-type ranging codes (in frequency-domain) defined in IEEE 802.16a, the proposed method achieves a better performance and greater robustness against multi-user interference and multi-path fading channels.
Keywords :
fading channels; frequency division multiple access; interference (signal); iterative methods; multipath channels; multiuser detection; timing; CDMA-type ranging codes; IEEE 802.16a; OFDMA systems; cyclic prefixes; initial ranging method; iterative multiuser timing offset estimator; multipath fading channels; multiuser interference; multiuser ranging signal detection; orthogonal ranging signal; orthogonal ranging signal design; power estimation; subscriber stations; Correlators; Decision support systems; Detectors; Fading; Interference; Multiaccess communication; Robustness; Signal design; Signal detection; Timing;
Conference_Titel :
Global Telecommunications Conference, 2005. GLOBECOM '05. IEEE
Print_ISBN :
0-7803-9414-3
DOI :
10.1109/GLOCOM.2005.1577888
