发明名称 |
WIRELESS LOCAL AREA NETWORK SPREAD SPECTRUM TRANSCEIVER WITH MULTIPATH INTERFERENCE MITIGATION |
摘要 |
A demodulator used in a base band processor of the spread spectrum radio transceiver includes a demodulator circuit for spread spectrum phase shift keying (PSK) demodulating an information signal received from a radio circuit. The information signal includes data symbols formed from a plurality of high rate mode chips forming a spread spectrum information signal. At least one predetermined code function correlator is in line with a signal input for decoding the information signal according to a predetermined code. A carrier loop circuit allows phase and frequency tracking of the information signal and a chip decision circuit is operative with the carrier loop circuit for tracking high rate mode chips. A decision feedback equalizer formed from a feedback finite impulse response filter is operative with the chip decision circuit and the carrier loop circuit. It has a plurality of feedback taps. At least one feedback tap is selected for logical add/subtract operations to aid in canceling multipath signal echoes. A feed forward finite impulse response filter can also be positioned in line to the code function correlator and the signal input and has a plurality of feed forward taps that are selected for logical multiply operations to aid in reducing multipath signal echoes. A method aspect of the invention is also disclosed. |
申请公布号 |
WO9946887(A3) |
申请公布日期 |
1999.10.21 |
申请号 |
WO1999US00852 |
申请日期 |
1999.01.15 |
申请人 |
HARRIS CORPORATION;ANDREN, CARL;WEBSTER, MARK, A. |
发明人 |
ANDREN, CARL;WEBSTER, MARK, A. |
分类号 |
H04L27/00;H04B1/707;H04B7/08;H04B7/26;H04L12/28;H04L12/56;H04L25/03;H04L27/227;H04L27/233;H04L27/38 |
主分类号 |
H04L27/00 |
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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