US 7,532,563 B1
	Mechanism to improve quality of channel estimates in OFDM transmissions
Kedar Shirali, Sunnyvale, Calif. (US); and Hemanth Sampath, Sunnyvale, Calif. (US)
Assigned to Marvell International Ltd., Hamilton (Bermuda)
Filed on Mar. 11, 2004, as Appl. No. 10/799,548.
Claims priority of provisional application 60/525014, filed on Nov. 25, 2003.
Int. Cl. H04J 9/00 (2006.01); H04L 5/04 (2006.01)

U.S. Cl. 370—205  [370/203; 370/204; 370/208; 370/209; 370/210; 379/343; 375/260; 375/261; 375/264; 375/348; 375/349]

67 Claims

1. A method performed by at least one device of a communication system, the method comprising: transmitting a pilot symbol structure including a first pilot symbol including pilot information on a first plurality of alternate tones, and a second pilot symbol including pilot information on a second plurality of alternate tones, wherein the tones in the second plurality of alternate tones and the first plurality of alternate tones are on opposite sides of and a same distance from a tone.