发明名称 |
DEVICES AND METHODS EMPLOYING HERMETIC TRANSFORMS FOR ENCODING AND DECODING DIGITAL INFORMATION IN SPREAD-SPECTRUM COMMUNICATION SYSTEMS |
摘要 |
In a direct sequence spread-spectrum (DSSS) systems, such as CDMA, information is encoded in symbols using phase shift keying or quadrature amplitude modulation. Further, a transmitter applied a selected time shifted lag to each symbol to convey additional information. A receiver detects both the symbol data and the lag value. The receiver can use a hermetic matched filter matrix to identify the lag. |
申请公布号 |
US2015117497(A1) |
申请公布日期 |
2015.04.30 |
申请号 |
US201414522774 |
申请日期 |
2014.10.24 |
申请人 |
Hobbit Wave |
发明人 |
WOODSUM Harvey C. |
分类号 |
H04B1/7095;H04B1/7103 |
主分类号 |
H04B1/7095 |
代理机构 |
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代理人 |
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主权项 |
1. A receiver method comprising:
receiving a direct sequence spread spectrum (DSSS) signal with a combination of data symbols and a code; deriving data from the data symbols; determining one of a plurality of different time-shifted lag values of the received code relative to a known reference value; deriving encoded data based on the lag value; outputting data derived from both the data symbols and from the lag value. |
地址 |
Weston MA US |