The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 09, 2012
Filed:
Sep. 27, 2008
Hang LI, Beijing, CN;
Hang Li, Beijing, CN;
Beijing Xinwei Telecom Technology Inc., Beijing, CN;
Abstract
This invention provides a user signal transmitting method in an OFDMA system, where all the time-frequency grids of each timeslot are divided into sub-channels, each sub-channel comprises Nsub-carriers overlapping in time, N≧4, and in each sub-channel, a maximum value of a frequency interval between adjacent sub-carriers is no less than three times of a minimum value thereof; and when a user message is sent, comprising: generating a modulating signal; allocating a time-frequency grid set which is a union set of sub-channel, where the sub-channel's quantity is determined by the user message's size, and the sub-channel's time-frequency position is selected according to a rule; and mapping the modulating signal to the time-frequency grid set to generate a frequency-domain signal; performing IFFT on the frequency-domain signal to generate a time-domain signal for transmission. This invention also provides a corresponding user signal receiving method, user signal transmitting and receiving apparatus and access system.