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USER SIGNAL TRANSMITTING AND RECEIVING METHOD, APPARATUS AND SYSTEM IN OFDMA SYSTEM

  • US 20100296385A1
  • Filed: 09/27/2008
  • Published: 11/25/2010
  • Est. Priority Date: 09/27/2007
  • Status: Active Grant
First Claim
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1. A user signal transmitting method in an Orthogonal Frequency-Division Multiple Access (OFDMA) system, wherein the OFDMA system comprises multiple terminals and multiple Base Transceiver Stations (BTS), a user communicates with the BTS via the terminal, and in an OFDMA access manner, a radio resource is divided into multiple two-dimensional time-frequency grids, and wherein all the time-frequency grids of each timeslot are divided into multiple sub-channels, in which each sub-channel comprises Nf sub-carriers overlapping in time, where Nf

  • 4, and in the Nf sub-carriers comprised in each sub-channel, a maximum value of a frequency interval between adjacent sub-carriers is three times or more than three times of a minimum value of the frequency interval between the adjacent sub-carriers; and

    ,when any one of the terminal and the BTS acts as a transmitter used for transmitting a user message of the user, the method comprises;

    generating a modulating signal of the user based on the user message to be sent;

    mapping the modulating signal of the user to a time-frequency grid set allocated by a network side to the user, to generate a frequency-domain signal of the user, wherein the time-frequency grid set is a union set of one or more sub-channels, in which a quantity of the one or more sub-channel is determined by a size of the user message, and a time-frequency position of the sub-channel is selected according to a predetermined rule; and

    ,performing Inverse Fast Fourier Transform on the frequency-domain signal of the user to generate a time-domain signal of the user, and transmitting the time-domain signal.

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