发明名称 |
Method and apparatus for transmitting messages to and from remote locations |
摘要 |
A method and apparatus for transmitting a message, in digital form, to or from a remote location. In a transmitter, a sequence of predetermined multiple-bit phase codes corresponding to the individual characters in the message phase modulate a carrier wave which also shifts frequency. At a receiving station, the various modulated carrier waves propagated through a dispersive medium constitute incoming signals with both frequency and range diversity. The receiver transforms the incoming signals into a sequence of quadrature component signals which it correlates with the multiple-bit phase code sequences to yield the digital representation of a transmitted message character at the receiving station.
|
申请公布号 |
US4030033(A) |
申请公布日期 |
1977.06.14 |
申请号 |
US19750586538 |
申请日期 |
1975.06.13 |
申请人 |
LOWELL TECHNOLOGICAL INSTITUTE RESEARCH FOUNDATION |
发明人 |
BIBL, KLAUS;REINISCH, BODO W. |
分类号 |
H04B7/22;H04L23/02;(IPC1-7):H04B7/02 |
主分类号 |
H04B7/22 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|