| US 7,542,504 B2 | ||
| Frequency hopping ofdma method using symbols of comb pattern | ||
| Kyung-Hi Chang, Daejon (Korea, Republic of); Kwang-Soon Kim, Daejon (Korea, Republic of); Yong-Soo Cho, Seoul (Korea, Republic of); and Suk-Won Ha, Seoul (Korea, Republic of) | ||
| Assigned to Electronics and Telecommunications Research Institute, (Korea, Republic of) | ||
| Appl. No. 10/532,734 PCT Filed Nov. 26, 2002, PCT No. PCT/KR02/02214 § 371(c)(1), (2), (4) Date Oct. 03, 2005, PCT Pub. No. WO2004/038972, PCT Pub. Date May 06, 2004. |
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| Claims priority of application No. 10-2002-0065638 (KR), filed on Oct. 26, 2002. | ||
| Prior Publication US 2006/0072649 A1, Apr. 06, 2006 | ||
| Int. Cl. H04B 1/00 (2006.01); H04B 1/66 (2006.01) | ||
| U.S. Cl. 375—132 [375/135; 375/136; 375/240.26] | 31 Claims |
| 1. method for performing frequency hopping Orthogonal Frequency Division Multiple Accesses (OFDMA), comprising the steps of:
a) allocating frequency domain signals X(k) of a comb pattern to a modulated data sequence, X(k) being comb symbols and k
being a frequency index;
b) performing frequency hopping so that the comb symbols could have an independent frequency offset; and
c) performing inverse Fast Fourier Transform (iFFT) on the comb symbols to be transformed to time domain signals x(n) and
transmitting, using a transmitter, the time domain signals x(n), n being a time index,
wherein the comb symbols formed of a predetermined number of sub-carriers, which is called a sub-carrier group, are positioned
on an entire usable frequency band at predetermined intervals and the number of subcarriers on the entire usable frequency
is expressed as:
 where NC denotes the number of comb symbols that can be allocated in the entire usable frequency band;
Nsi denotes the number of sub-carriers within an ith comb symbol, the size of the ith comb symbol, or the size of a sub-carrier group constituting the ith comb symbol, and
 wherein, in the step b), frequency hopping is performed on comb symbols Xa,b(k) allocated to the mobile station in the cell according to a frequency indicator function Ya,b(k;l), which is a frequency hopping pattern and expressed as:
Ya,b(k;l)==Xa,b((k+P(l))modN)
where P(l) (0≤P(l)≤N) is a frequency hopping pattern of comb symbols within a cell in a time slot 1; and
N denotes the entire number of sub-carriers.
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