发明名称 |
METHODS AND APPARATUS FOR BACKWARDS COMPATIBLE COMMUNICATION IN A MULTIPLE ANTENNA COMMUNICATION SYSTEM USING TIME ORTHOGONAL SYMBOLS |
摘要 |
<p>A method and apparatus are disclosed for transmitting symbols in a multiple antenna communication system according to a frame structure, such that the symbols can be interpreted by a lower order receiver (i.e., a receiver having a fewer number of antennas than the transmitter). The disclosed frame structure comprises a legacy preamble having at least one long training symbol and N-1 additional long training symbols that are transmitted on each of N transmit antennas. The legacy preamble may be, for example, an 802.11 a/g preamble that includes at least one short training symbol, at least one long training symbol and at least one SIGNAL field. A sequence of each of the long training symbols on each of the N transmit antennas are time orthogonal. The long training symbols can be time orthogonal by introducing a phase shift to each of long training symbols relative to one another.</p> |
申请公布号 |
EP1639776(A1) |
申请公布日期 |
2006.03.29 |
申请号 |
EP20040756444 |
申请日期 |
2004.06.30 |
申请人 |
AGERE SYSTEMS, INC. |
发明人 |
KOPMEINERS, ROBERT JOHN;SCHENK, TIM;VAN ZELST, ALLERT |
分类号 |
H04B7/06;H04J99/00;H04L1/06;H04L25/02;H04L27/26;(IPC1-7):H04L27/26 |
主分类号 |
H04B7/06 |
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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