Title :
New ICI reduction schemes for OFDM system
Author :
Sathananthan, K. ; Tellambura, C.
Author_Institution :
Fac. of Inf. Technol., Monash Univ., Clayton, Vic., Australia
fDate :
6/23/1905 12:00:00 AM
Abstract :
Orthogonal frequency division multiplexing (OFDM) is sensitive to the carrier frequency offset (CFO). We introduce the peak interference-to-carrier ratio (PICR) to measure the resulting intercarrier interference (ICI). This paper shows that the PICR can be reduced by coding to select only those messages with low PICR as valid codewords. While explicit constructions of higher-rate, ICI-suppressing codes are rather difficult, we propose two new codes that map data onto three and four adjacent subcarriers. We also propose a new ICI reduction scheme, called tone reservation, that inserts optimized pilot tones in the data frame. Computing these pilot tones at the transmitter is a simple optimization technique
Keywords :
OFDM modulation; block codes; interference suppression; mobile radio; optimisation; radiofrequency interference; statistical analysis; OFDM; block codes; carrier frequency offset; intercarrier interference reduction; interference suppressing codes; mobile radio; optimization; orthogonal frequency division multiplexing; pilot tones; statistical distribution; tone reservation; Australia; Bit error rate; Frequency estimation; Gaussian noise; Information technology; Interference; OFDM modulation; Peak to average power ratio; Throughput; Wireless sensor networks;
Conference_Titel :
Vehicular Technology Conference, 2001. VTC 2001 Fall. IEEE VTS 54th
Conference_Location :
Atlantic City, NJ
Print_ISBN :
0-7803-7005-8
DOI :
10.1109/VTC.2001.956889