发明名称 |
RANGE EXTENSION TECHNIQUES FOR A WIRELESS LOCAL AREA NETWORK |
摘要 |
Techniques for extending transmission range in a WLAN are described. In an aspect, a receiving station determines the frequency error between a transmitting station and the receiving station based on one or more initial packet transmissions and corrects this frequency error for subsequent packet transmissions received from the transmitting station. The residual frequency error is small after correcting for the frequency error and allows the receiving station to perform coherent accumulation/ integration over a longer time interval to detect for a packet transmission. The longer coherent accumulation interval improves detection performance, especially at low SNRs for extended transmission range. The techniques may be used whenever the receiving station knows the identity of the transmitting station, e.g., if the subsequent packet transmissions are scheduled. In another aspect, a preamble is generated with a longer spreading sequence and sent with each packet transmission. |
申请公布号 |
WO2007120331(A3) |
申请公布日期 |
2008.06.12 |
申请号 |
WO2006US62033 |
申请日期 |
2006.12.13 |
申请人 |
QUALCOMM INCORPORATED;WALLACE, MARK S.;WALTON, JAY RODNEY |
发明人 |
WALLACE, MARK S.;WALTON, JAY RODNEY |
分类号 |
H04L27/26;H04B1/707;H04L7/04;H04W72/12;H04W74/02;H04W84/12;H04W88/04 |
主分类号 |
H04L27/26 |
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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