OFDMA uplink ranging for IEEE 802.16e using modified generalized chirp-like polyphase sequences

Author

Lee, Doo Hwan

Author_Institution

Sch. of Electr. Eng. & Comput. Sci., Seoul Nat. Univ.

fYear

2005

fDate

26-29 Sept. 2005

Abstract

For uplink synchronization, IEEE 802.16e wireless metropolitan area networks group has suggested ranging for OFDMA based uplink system. However, it is inherently vulnerable to the channel selectivity and other users´ interferences at low SNR. In this paper, a novel detection scheme for OFDMA ranging has been proposed using modified generalized chirp-like (GCL) sequences to cope with these drawbacks. Modifying GCL sequences, hybrid detection scheme which simultaneously carrying out non-coherent and differential detection can be achieved. The ranging performance has been considerably enhanced with this algorithm. Simulation results show that the proposed scheme is applicable to -3 dB with the mobility up to 50 km/h

Keywords

OFDM modulation; metropolitan area networks; mobile computing; mobile radio; GCL sequences; IEEE 802.16e; OFDMA based uplink system; OFDMA ranging; OFDMA uplink ranging; WirelessMAN; channel selectivity; differential detection; hybrid detection scheme; low SNR; modified generalized chirp-like polyphase sequences; noncoherent detection; uplink synchronization; user interferences; wireless metropolitan area networks; Base stations; Chirp; Computer science; Frequency conversion; Frequency synchronization; Interference; Metropolitan area networks; Peak to average power ratio; Signal processing; Wireless LAN; GCL sequences; Ranging; WirelessMAN;

fLanguage

English

Publisher

ieee

Conference_Titel

Internet, 2005.The First IEEE and IFIP International Conference in Central Asia on

Conference_Location

Bishkek

Print_ISBN

0-7803-9179-9

Type

conf

DOI

10.1109/CANET.2005.1598197

Filename

1598197