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2008

Iterative frequency domain channel estimation for dft-precoded ofdm systems using in-band pilots

8 years 5 months ago
Iterative frequency domain channel estimation for dft-precoded ofdm systems using in-band pilots
We consider two techniques of in-band frequency domain multiplexed (FDM) pilots using interleaved frequency domain multiple access (IFDMA) signal with a Chu sequence for DFT-precoded OFDM (or single-carrier (SC)) systems. One, called frequency domain superimposed pilot technique (FDSPT), superimposes pilot tones onto scaled or deleted data tones, which preserves spectral efficiency at the expense of a slight performance loss. The other, called frequency expanding technique (FET), multiplexes pilot tones by displacing data tones, which slightly reduces spectral efficiency. Using FDM pilots in SC systems facilitates flexible and efficient assignment of signals to available spectrum. We propose an iterative frequency domain decision-directed interference cancellation technique to reduce the intersymbol interference level of SC signals with FDSPT pilots (resulting from the suppression of data tones). Moreover, we propose a low complexity frequency domain iterative decisiondirected channel ...
Chan-Tong Lam, David D. Falconer, Florence Danilo-
Added 13 Dec 2010
Updated 13 Dec 2010
Type Journal
Year 2008
Where JSAC
Authors Chan-Tong Lam, David D. Falconer, Florence Danilo-Lemoine
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