Channel identifiability of OFDM-CDMA system based on subspace method

Subspace method is well-known in CDMA channel estimation. But a basic problem, channel identifiability by subspace method, is still not well-solved. In this paper, two subspace based blind methods for estimating the channel responses of a OFDM-CDMA system in downlink and uplink are discussed respect...

Full description

Saved in:
Bibliographic Details
Published inICICS-PCM 2003 proceedings of the 2003 Joint Conference of the Fourth International Conference on Information, Communications & Signal Processing and Fourth Pacific-Rim Conference on Multimedia : 15-18 December 2003, Meritus Mandarin Singapore Hotel, Singa Vol. 1; pp. 663 - 667 Vol.1
Main Authors Yonghong Zeng, Tung Sang Ng
Format Conference Proceeding
LanguageEnglish
Published IEEE 2003
Subjects
Channel estimation
Discrete Fourier transforms
Downlink
Interference
Multiaccess communication
Multicarrier code division multiple access
OFDM
Robustness
Upper bound
Wireless communication
Online AccessGet full text
ISBN0780381858
9780780381858
DOI10.1109/ICICS.2003.1292537

Cover

More Information
Summary:Subspace method is well-known in CDMA channel estimation. But a basic problem, channel identifiability by subspace method, is still not well-solved. In this paper, two subspace based blind methods for estimating the channel responses of a OFDM-CDMA system in downlink and uplink are discussed respectively. Under some reasonable assumptions, it is mathematically proved that subspace method for downlink can estimate the channel subject to a scalar ambiguity, and the method for uplink can give the channel responses subject to a diagonal matrix ambiguity. The methods do not need precise channel order information (only an upper bound for the orders is required). Simulations show that the methods are effective and robust.
ISBN:0780381858
9780780381858
DOI:10.1109/ICICS.2003.1292537