Patent ID: 7885345
Filing Date: 2011-02-08
Classification: H04L

Abstract:
1. A pilot allocation method for an orthogonal frequency division multiplexing system, used for the communication system which at least including one transmitter and two transmitting antennas, including the following steps: step 1, a user data carrier allocating module in the transmitter allocating data carriers to a data symbol of a user, then mapping user data to the allocated carriers, and finally, outputting the mapped user data to an inverse fourier transform module in the transmitter; and step 2, at the same time with step 1, a pilot data carrier allocating module in the transmitter determining the allocation rule of pilot data according to the subchannel allocation manner and the number of the transmitting antennas of the system, and allocating pilot carriers to the pilot data, then mapping the pilot data to the allocated carriers, and finally, outputting the pilot data to the inverse Fourier transform module, wherein, in step 2, in the circumstance that the subchannel allocation manner of the system is usage of all subchannels, through the manner of setting the carrier offsets of the variable pilot sets of the system, obtaining four groups of variable pilot sets numbered as 0, 1, 0+, 1+, and in conjunction with two groups of the fixed pilot sets of the system numbered as 0 and 1 and according to the number of the transmitting antennas, determining the pilot allocation of each transmitting antenna to each symbol, and the determining method for pilot allocation being as follows: in a pilot allocation period, the pilot interval of the pilots allocated to each antenna is the same with that of the usage of all subchannels in a mode of non-space-time code.