Title :
Pilot assisted channel estimation for OFDM in mobile cellular systems
Author :
Tufvesson, Fredrik ; Maseng, Torleiv
Author_Institution :
Dept. of Appl. Electron., Lund Univ., Sweden
Abstract :
The use of pilot symbols for channel estimation introduces overhead and it is thus desirable to keep the number of pilot symbols to a minimum. The number of needed pilot symbols for a desired bit error rate and Doppler frequency is highly dependent on the pilot pattern used in orthogonal frequency division multiplexed, OFDM, systems. Five different pilot patterns are analysed by means of resulting bit error rate, which is derived from channel statistics. Rearrangement of the pilot pattern enables a reduction in the number of needed pilot symbols up to a factor 10, still retaining the same performance. The analysis is general and can be used for performance analysis and design of pilot patterns for any OFDM system
Keywords :
Doppler effect; cellular radio; coding errors; error statistics; frequency division multiplexing; multipath channels; parameter estimation; quadrature phase shift keying; Doppler frequency; OFDM; QPSK; bit error rate; channel statistics; mobile cellular systems; multipath distortion; orthogonal frequency division multiplexing; overhead; performance analysis; pilot assisted channel estimation; pilot patterns design; Bandwidth; Bit error rate; Broadcasting; Channel estimation; Mobile communication; Narrowband; OFDM; Pattern analysis; Time measurement; Transmitters;
Conference_Titel :
Vehicular Technology Conference, 1997, IEEE 47th
Conference_Location :
Phoenix, AZ
Print_ISBN :
0-7803-3659-3
DOI :
10.1109/VETEC.1997.605836
