US 7,492,701 B2
Apparatus and method for controlling adaptive modulation and coding in an orthogonal frequency division multiplexing communication system
Kee-Bong Song, Chuncheon-si (Korea, Republic of); and Dong-Jun Lee, Seoul (Korea, Republic of)
Assigned to Samsung Electronics Co., Ltd, (Korea, Republic of)
Filed on Nov. 18, 2004, as Appl. No. 10/992,164.
Claims priority of application No. 10-2003-0082327 (KR), filed on Nov. 19, 2003.
Prior Publication US 2005/0157639 A1, Jul. 21, 2005
Int. Cl. H04J 11/00 (2006.01)
U.S. Cl. 370—208  [455/23] 13 Claims
OG exemplary drawing
 
1. A method of controlling adaptive modulation and coding (AMC) in an orthogonal frequency division multiplexing (OFDM) communication system in which an entire frequency band is divided into a plurality of sub-carrier bands, comprising the steps of:
(1) calculating a power and a number of transmission bits for each of the sub-carriers in a predetermined method for each coding method available in the OFDM communication system;
(2) calculating a data rate for each coding method based on the number of transmission bits and the power for each sub-carrier;
(3) determining a coding method having a highest of the calculated data rates for the OFDM communication system; and
(4) determining a modulation method for the OFDM communication system according to a number of transmission bits in the determined coding method;
wherein the step of calculating the number of transmission bits and the power for each sub-carrier for each of the coding methods is performed by

OG Complex Work Unit Drawing
where i is an index of a coding method available in the OFDM communication system, R(Ci) is a coding rate of an ith coding method Ci, and mn is a number of transmission bits for an nth sub-carrier Pn is transmit power of bits transmitted on the nth sub-carrier.