An analysis of two-dimensional pilot-symbol assisted modulation for OFDM

Author

Nilsson, Rickard ; Edfors, Ove ; Sandell, Magnus ; Börjesson, Per Ola

Author_Institution

Div. of Signal Process., Lulea Univ. of Technol., Sweden

fYear

1997

fDate

17-19 Dec 1997

Firstpage

71

Lastpage

74

Abstract

In this paper we analyze two-dimensional (2D) pilot-symbol assisted modulation (PSAM) for wireless orthogonal frequency-division multiplexing (OFDM). 2D-PSAM has been suggested for wireless OFDM by several authors and is included in a preliminary draft of the standard for European digital video broadcast. We generalize the analysis of single-carrier PSAM to the 2D time-frequency lattice of OFDM. We analyze 2D-PSAM for two different channel estimators: one with good performance and high complexity and one suboptimal with low complexity. We verify that a good rule of thumb is to place the pilots at least as twice as close, in time and frequency, as required by the 2D sampling theorem

Keywords

frequency division multiplexing; modulation; telecommunication channels; time-frequency analysis; 2D sampling theorem; 2D time-frequency lattice; 2D-PSAM; OFDM; channel estimators; two-dimensional pilot-symbol assisted modulation; wireless orthogonal frequency-division multiplexing; Bandwidth; Channel estimation; Delay; Digital modulation; Digital signal processing; Digital video broadcasting; Lattices; OFDM modulation; Random variables; Sampling methods;

fLanguage

English

Publisher

ieee

Conference_Titel

Personal Wireless Communications, 1997 IEEE International Conference on

Conference_Location

Mumbai

Print_ISBN

0-7803-4298-4

Type

conf

DOI

10.1109/ICPWC.1997.655481

Filename

655481