| US 7,526,035 B2 | ||
| Apparatus and method for switching between an AMC mode and a diversity mode in a broadband wireless communication system | ||
| Chang-Ho Suh, Seongnam-si (Korea, Republic of); Young-Kwon Cho, Suwon-si (Korea, Republic of); Su-Ryong Jeong, Suwon-si (Korea, Republic of); and Seok-Hyun Yoon, Suwon-si (Korea, Republic of) | ||
| Assigned to Samsung Electronics Co., Ltd, (Korea, Republic of) | ||
| Filed on Apr. 04, 2005, as Appl. No. 11/98,679. | ||
| Claims priority of application No. 10-2004-0023631 (KR), filed on Apr. 07, 2004. | ||
| Prior Publication US 2005/0238108 A1, Oct. 27, 2005 | ||
| Int. Cl. H04K 1/10 (2006.01) | ||
| U.S. Cl. 375—260 [375/267; 375/148; 375/138; 375/132] | 11 Claims |
| 1. A communication method for a mobile station in a broadband wireless communication system in which a total frequency band
of sub-carriers is divided into a plurality of sub-bands and frame cells (FCs) are defined, each FC being defined by one sub-band
and a predetermined time period, and having at least one time-frequency cell (TFC) defined by one orthogonal frequency division
multiplexing (OFDM) symbol and a predetermined number of subcarriers, the method comprising the steps of:
OFDM-demodulating a received signal by fast Fourier transform (FFT)-processing the received signal and separating the OFDM-demodulated
data according to the sub-bands;
extracting pilot data from the separated OFDM-demodulated data;
generating channel estimates of each of the sub-bands for the predetermined time period using the extracted pilot data;
calculating a channel mean (A) and a channel secondary statistical value (B) of each of the sub-bands using channel estimates
for a predetermined time among the generated channel estimates;
calculating a channel secondary statistical value (C) of at least one of the sub-bands using channel estimates for a predetermined
frequency among the generated channel estimates; and
transmitting, to a base station, channel measurement information including the calculated one or more mean value(s) (A), the
calculated one or more secondary statistical value(s) (B), and the calculated one or more secondary statistical value(s) (C);
detecting data of allocated TFCs from the OFDM-demodulated data; generating a symbol sequence by despreading the detected
data with a predetermined spreading code; and
recovering data by demodulating and decoding the symbol sequence;
wherein the one or more mean value(s) (A) represents an average frequency-domain channel states, the one or more secondary
statistical value(s) (B) represents a channel variation in frequency-domain, and the one or more secondary statistical value(s)
(C) represents a channel variation in time-domain.
|