Lesson 22 — GPS Gold Codes; Spread Spectrum; Code-division multiple access (CDMA)

Gold Codes are XORed combinations of taps from Linear Feedback Shift Registers (LFSRs). This is used in spread-spectrum communications, including the Code-division multiple access (CDMA) that GPS satellites use.

The GPS reference used to find the taps for the C/A code is [http://www.naic.edu/~phil/rfi/gps/AFD-070803-059-1.pdf].

See also:

Gold code - Wikipedia

Flowgraphs

lesson22_GPS_cacode_Gold_Code_LFSR.grc

Running:

Other flowgraphs for this lesson:

• lesson22_GPS_cacode_Gold_Code_LFSR_check_known_cacodes.grc

All GNURadio flowgraphs are at https://github.com/gallicchio/learnSDR