Time and frequency channel estimation

专利名称：Time and frequency channel estimation发明人：Afif Osseirar,Andrew Logothets申请号：US12461420申请日：20090811

公开号：US201002024A1公开日：20100812

专利附图：

摘要：A radio channel estimation technique is described for use in a OFDM-basedradio communications system. A block of OFDM symbols is transmitted from multipleantennas over multiple sub-carrier frequencies. The block of OFDM symbols includesknown pilot symbols as well as data symbols to be determined by a receiver. The pilot

symbols are transmitted in a predetermined pattern at periodic times on periodic sub-carriers. A pilot channel estimate is determined for each pilot symbol in the receivedblock of OFDM symbols. An N×M matrix of points corresponding to the received OFDMsymbol block is formed. N is the number of sub-carriers and M is the number of OFDMsymbols in the OFDM symbol block. The matrix is formed by inserting pilot channelestimates at predetermined positions in the N×M matrix according to the predeterminedpilot pattern and inserting zeros in remaining positions in the N×M matrix. A twodimensional inverse Fourier transform of the N×M matrix is calculated resulting inmultiple copies of a channel estimate in the time domain. One is selected, and a twodimensional Fourier transform of the selected channel estimate is calculated to obtain achannel estimate at each point in the OFDM block.

申请人：Afif Osseirar,Andrew Logothets

地址：Kista SE,Deaconsfield Buckinghamshire GB

国籍：SE,GB

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