Convolutional ambiguity multiple access (CAMA) transmission syst

Details Convolutional ambiguity multiple access (CAMA) transmission syst Convolutional ambiguity multiple access (CAMA) transmission syst

1994-09-24

1996-09-17

Chin, Stephen

Pulse or digital communications

Systems using alternating or pulsating current

Angle modulation

375275, 375279, 375322, 375329, 375335, 375346, H03K 706, H03K 906, H04L 2710, H04L 2722

Patent

active

055576370

ABSTRACT:
A communication system that reduces significantly the processing required to search over unknown time delays and unknown frequency shifts. Convolutional type processing with a unique re-indexing of the desired signal's Fourier transform is provided so as to allow for the design of a communication system that is invariant to time of arrival and frequency shift such as that caused by doppler effects from moving vehicles or moving satellites. The processing required is several orders of magnitude less computationally intensive than conventional approaches to solving this problem. In addition, the inventive convolutional ambiguity multiple access (CAMA) system can be used in conjunction with M-Ary FSK (Frequency Shift Keying) and other coding techniques to decode the various frequency codes efficiently. The technique also can be used as a processing system for radar, sonar, ultrasound, ladar, and other reflective transmission signals to generate a full ambiguity function, utilizing an arbitrary waveform efficiently. In addition, by processing each frequency independently, it is possible to remove frequency distortion (or time distortion that is frequency dependent) more accurately.

REFERENCES:
patent: 4187000 (1980-02-01), Constant
patent: 5029184 (1991-07-01), Andren et al.
patent: 5065242 (1991-11-01), Dieterich et al.
patent: 5191594 (1993-03-01), Argo et al.
patent: 5260968 (1993-11-01), Gardner et al.
patent: 5272466 (1993-12-01), Venczel

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