发明名称 |
Spread spectrum multipath receiver without a tracking loop |
摘要 |
An improvement to a receiver for receiving multiple rays, due to multipath, of a received spread-spectrum signal having a chip-sequence signal with a chip rate embedded therein. The received spread-spectrum signal is sampled by an analog-to-digital converter at approximately twice the chip rate and then the samples are shifted in a shift register. The shift register shifts the chips of the underlying chip-sequence signal at approximately twice the chip rate. A matched filter includes an adder tree which, in cooperation with the shift register, forms an impulse response matched to the chip-sequence signal. The adder tree detects initially the chip-sequence signal embedded in the first ray, and outputs a first correlation signal. The adder tree then detects the chip-sequence signal embedded in the second ray, and outputs a second correlation signal. The adder tree continues to detect the chip-sequence signal of subsequent rays, and outputs subsequent correlation signals. A combiner combines each of the correlation signals using maximal-ratio combining. No tracking loop is required even though the chip clock and the sampling clock have slightly different frequencies.
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申请公布号 |
US6014405(A) |
申请公布日期 |
2000.01.11 |
申请号 |
US19970957733 |
申请日期 |
1997.10.24 |
申请人 |
GOLDEN BRIDGE TECHNOLOGY, INC. |
发明人 |
GARODNICK, JOSEPH;SCHILLING, DONALD L. |
分类号 |
H04B1/707;(IPC1-7):H04B15/00 |
主分类号 |
H04B1/707 |
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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