Methods for Obtaining CIR Based on IFFT in MIMO-OFDMA Mobile Communication Systems

Author

Lu Xin ; Wang Jian-hua ; Xu Jong

Author_Institution

Shenzhen Inst. of Inf. Technol., Shenzhen

fYear

2008

fDate

12-14 Oct. 2008

Firstpage

1

Lastpage

4

Abstract

This paper mainly focus on methods for obtaining the CIR by performing the IFFT of CFR, which are heuristic or direct to improve channel estimation and tracking in MIMO- OFDMA systems. When FUSC mode is used, pilot signal are uniformaly inserted into the carrier sets during preamble and the FFT size over pilots spacing is an integer in mobile WiMAX. Therefore, it is possible to obtain CPR based on IFFT of CFR In this paper, we propose two methods involved in IFFT to get CIR, and the size of FFT used by method-1 is smaller than that done by method-2 however, method-1 has to consider the problem about the offset of pilot carriers.

Keywords

MIMO communication; OFDM modulation; WiMax; fast Fourier transforms; mobile communication; multi-access systems; FUSC mode; IFFT; MIMO-OFDMA mobile communication systems; channel impulse response; mobile WiMAX; pilot spacing; Baseband; Channel estimation; Diversity reception; Information technology; MIMO; Mobile communication; OFDM; Peak to average power ratio; Transmitting antennas; WiMAX;

fLanguage

English

Publisher

ieee

Conference_Titel

Wireless Communications, Networking and Mobile Computing, 2008. WiCOM '08. 4th International Conference on

Conference_Location

Dalian

Print_ISBN

978-1-4244-2107-7

Electronic_ISBN

978-1-4244-2108-4

Type

conf

DOI

10.1109/WiCom.2008.157

Filename

4678066