Method and apparatus for despreading a spread spectrum signal at

Details Method and apparatus for despreading a spread spectrum signal at Method and apparatus for despreading a spread spectrum signal at

1982-10-14

1984-11-20

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

329104, 375 96, H03D 124

Patent

active

044843356

ABSTRACT:
A baseband correlation circuit (10) receives an IF spread spectrum input signal which is phase compared with a local oscillator signal and a phase shifted local oscillator signal to produce I channel and Q channel spread baseband signals. Each of these signals is input to four sample and hold circuits (34-48). A local PN code signal is converted from two-phase to four-phase to produce I and Q channel local PN signals. These signals together with the logical inverses thereof are provided as the control inputs for the sample and hold circuits (34-48). For each pair of sample and hold circuits there is a respective summer (86-92). The pair of sample and hold circuits together with the corresponding summer comprises a double balanced multiplier. There are four double balanced multipliers for producing four respective product signals. The product signals are input as pairs into summers (106) and (108) to produce despread, narrowband baseband I and Q channel output signals at output lines (110, 112). The baseband correlator circuit (10) of the present invention serves to despread the spread spectrum IF signal at baseband, thereby eliminating the need for costly and bulky components which are required for despreading at RF frequencies.

REFERENCES:
patent: 4119926 (1978-10-01), Frosch
patent: 4203071 (1980-05-01), Bowles et al.
patent: 4241347 (1980-12-01), Albanese et al.

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