US 7,457,324 B2
Multi-carrier CDMA radio transmitting method and apparatus, and channel estimation method and apparatus for multi-carrier CDMA radio transmitting system
Sadayuki Abeta, Yokosuka (Japan); Hiroyuki Atarashi, Yokohama (Japan); and Mamoru Sawahashi, Yokohama (Japan)
Assigned to NTT DoCoMo, Inc., Tokyo (Japan)
Filed on Feb. 12, 2001, as Appl. No. 9/780,501.
Claims priority of application No. 2000-046624 (JP), filed on Feb. 23, 2000; and application No. 2000-081050 (JP), filed on Mar. 22, 2000.
Prior Publication US 2001/0028637 A1, Oct. 11, 2001
Int. Cl. H04J 3/00 (2006.01)
U.S. Cl. 370—521  [370/480; 370/493] 11 Claims
OG exemplary drawing
 
7. A multi-carrier CDMA radio transmitting apparatus replicating each information symbols, disposing the replicated information symbols along a frequency axis, multiplying the replicated information symbols by a spreading code along the frequency axis, thus spreading the information symbols into components of a plurality of sub-carriers having different frequencies, and thus rendering multiplex transmission of the information, comprising
an intermittent transmission control part variably controlling a duration of multiplex transmission interval between a first transmission of a symbol and a subsequent transmission of a symbol, along a time axis for each user to which the information is to be transmitted, and controlling the transfer timing of transmission data by increasing or decreasing intervals between the first transmission and the subsequent transmission along the time axis.