Title :
Performance evaluation of channel estimation techniques for a mobile fourth generation wide area OFDM system
Author :
Dowler, Alex ; Doufexi, Angela ; Nix, Andrew
Author_Institution :
Centre for Commun. Res., Bristol Univ., UK
Abstract :
In this paper channel estimation techniques for a mobile fourth generation coherent orthogonal frequency division multiplexing (OFDM) system are proposed. Coherent detection dictates that a per-subband estimate of the frequency response of the channel is generated for each OFDM symbol. This is achieved by inserting pilot symbols amongst the data symbols in the OFDM modulation grid. With suitable interpolation, the channel estimate at all intermediate symbols can be generated. A number of channel estimation methods with different pilot patterns and interpolation methods are examined for a range of UTRA specified channel environments. Each environment is shown to have an optimal pilot scheme, power level, pattern and density and the paper proposes the use of adaptive pilot processing.
Keywords :
4G mobile communication; OFDM modulation; adaptive signal processing; cellular radio; channel estimation; interpolation; signal detection; 4G cellular network; OFDM symbol; adaptive pilot processing; channel estimation; coherent detection; data symbols; frequency response; interpolation; mobile fourth generation system; optimal pilot scheme; orthogonal frequency division multiplexing; per-subband estimate; performance evaluation; pilot symbols; power level; wide area OFDM system; Channel estimation; Delay; Frequency estimation; Frequency response; Interpolation; Land mobile radio cellular systems; Nonlinear distortion; OFDM modulation; Wideband; Wiener filter;
Conference_Titel :
Vehicular Technology Conference, 2002. Proceedings. VTC 2002-Fall. 2002 IEEE 56th
Print_ISBN :
0-7803-7467-3
DOI :
10.1109/VETECF.2002.1040576