Communication scheme using non-coherent frequency detection of t

Details Communication scheme using non-coherent frequency detection of t Communication scheme using non-coherent frequency detection of t

1995-02-21

1999-07-20

Pham, Chi H.

Pulse or digital communications

Pulse code modulation

375265, 371 434, 455 61, H04L 2728, H04L 512, H04L 2302

Patent

active

059265086

ABSTRACT:
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.

REFERENCES:
patent: 4457004 (1984-06-01), Gersho et al.
patent: 4945549 (1990-07-01), Simon et al.
patent: 4980897 (1990-12-01), Decker et al.
patent: 5204874 (1993-04-01), Falconer et al.
patent: 5233629 (1993-08-01), Paik et al.
patent: 5243629 (1993-09-01), Wei
patent: 5418798 (1995-05-01), Wei
Dixon, Robert C, "Spread Spectrum Systems with Commerical Applications" 3rd Ed., pp. 141-142, 1994.
Lee et al., Trellis Coding of Non-coherent Multiple Symbol Full Response M-ary CPFSK with Modulation Index 1/M, MILCON Jan. 1994.
Ennaciri et al., Analysis of performance of a TCM-OFDM multicarrier digital in the mobile radio, Jan., 1995.

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