Technique for increasing the data rate in a spread spectrum data

Details Technique for increasing the data rate in a spread spectrum data Technique for increasing the data rate in a spread spectrum data

1993-10-04

1994-10-04

Gregory, Bernarr E.

Pulse or digital communications

Repeaters

Testing

380 34, 375 23, 375 68, 332112, 370 10, H04L 2730, H03C 700

Patent

active

053533038

ABSTRACT:
A method for increasing the bit rate of a data link is to select two additional 31-bit chip code patterns that are orthogonal to the present two chip codes, and to each other. This method will not require any more bandwidth that the present 10 MHz used. This method suggests that each of the four chip code patterns are assigned a two bit value i.e.: 00, 01, 10, 11. At present, the two correlated chip codes represent data in a pulse position method. No information is transferred by determining which of the two chip codes actually correlated. This new method suggests each of the four chip code patterns will still perform the pulse position modulation and also provide two additional bits of data. These additional two bits of data will up the data rate of the link by 100 percent. Alternatively, the data rate may be increased by coding the datasuch that a reduction in duty cycle is realized as well as an increase in the data rate. Variations of the coding scheme avoid repeating a chip code in successive windows to reduce the effects of multipath propagation.

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Data Link Message Format Specification (DFCS), Feb. 17, 1976, pp. 1-62, IBM #75-L36-032.

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