发明名称 |
TIME AND FREQUENCY CHANNEL ESTIMATION IN AN OFDM SYSTEM |
摘要 |
A radio channel estimation technique is described for use in a OFDM-based radio communications system. A block of OFDM symbols is transmitted from multiple antennas over multiple sub-carrier frequencies. The block of OFDM symbols includes known 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 received block of OFDM symbols. An N × M matrix of points corresponding to the received OFDM symbol block is formed. N is the number of sub-carriers and M is the number of OFDM symbols in the OFDM symbol block. The matrix is formed by inserting pilot channel estimates at predetermined positions in the N × M matrix according to the predetermined pilot pattern and inserting zeros in remaining positions in the N × M matrix. A two dimensional inverse Fourier transform of the N × M matrix is calculated resulting in multiple copies of a channel estimate in the time domain. One is selected, and a two dimensional Fourier transform of the selected channel estimate is calculated to obtain a channel estimate at each point in the OFDM block. |
申请公布号 |
CA2830386(A1) |
申请公布日期 |
2006.12.14 |
申请号 |
CA20062830386 |
申请日期 |
2006.05.17 |
申请人 |
TELEFONAKTIEBOLAGET L M ERICSSON (PUBL) |
发明人 |
OSSEIRAN, AFIF;LOGOTHETIS, ANDREW |
分类号 |
H04J11/00;H04B1/76;H04B7/06 |
主分类号 |
H04J11/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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