发明名称 |
Communication scheme using non-coherent frequency detection of trellis-based coding of plural transmission frequencies per baud |
摘要 |
A reduced cost, robust data communication scheme for very small aperture terminal satellite communication systems combines non-coherent frequency detection and trellis-coded, multi-frequency modulation. The data code width is associated with the size of a multiple frequency set and the selection of a given combination of frequencies for transmission during a respective baud. One portion the data is convolutionally encoded and points to an orthogonal signal set associated with frequencies of a partitioned multiple frequency set. Another portion of the data identifies the frequency combination within the group pointed to by the one portion. The combined portions encode a multi-frequency transmission waveform. At the receiver, the multi-frequency tone sequence is detected by non-coherent frequency detection. For each baud, matched filters output a most likely set of frequencies transmitted during that baud, as soft decisions to a Viterbi decoder.
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申请公布号 |
US5926508(A) |
申请公布日期 |
1999.07.20 |
申请号 |
US19950391965 |
申请日期 |
1995.02.21 |
申请人 |
KOOS TECHNICAL SERVICES, INC. |
发明人 |
KOOS, LARRY W.;KOOS, JR., WILLIAM M.;MALLORY, PETER E. |
分类号 |
H04B7/185;H04L1/00;H04L27/30;(IPC1-7):H04L27/28;H04L5/12;H04L23/02 |
主分类号 |
H04B7/185 |
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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