Data transmission
First Claim
Patent Images
1. A spread spectrum system for transmitting and receiving binary data, wherein a spread spectrum transmitter includes:
- means for deriving according to a first predetermined recurrence relationship a pseudo-random binary pulse train having a greater bit rate than the data signal at least in part from the data signal;
means for modulating the pseudo-random pulse train with the data signal to produce an increased bandwidth signal; and
means to phase shift key modulate a coherent RF carrier with the increased bandwidth signal to produce a spread spectrum signal;
and wherein a spread spectrum receiver includes;
an input for receiving the spread spectrum signal;
delay line sections coupled to the input and at least one balanced modulator for combining signals subject to different delays in the delay line sections according to a second predetermined recurrence relationship, the said first second predetermined relationships being such that the delay line sections and at least one balanced modulator derive the said pseudo-random binary pulse train only from the spread spectrum signal, anda further balanced modulator having a first input coupled to the said input for receiving the spread spectrum signal and a second input coupled to receive the said pseudo-random binary pulse train derived from the spread spectrum signal to cross-correlate that pulse train with the signal received at the first input to produce a signal comprising the data demodulated from the pseudo-random binary pulse train.
0 Assignments
0 Petitions
Accused Products
Abstract
An arrangement for spectrum spreading of a signal for a data transmission link by providing the signal as a bipolar waveform and modulating it on a fast pseudo-random bipolar binary pulse train. In this invention the pseudo-random pulse train is generated at least in part in response to the data signal.
-
Citations
11 Claims
-
1. A spread spectrum system for transmitting and receiving binary data, wherein a spread spectrum transmitter includes:
-
means for deriving according to a first predetermined recurrence relationship a pseudo-random binary pulse train having a greater bit rate than the data signal at least in part from the data signal; means for modulating the pseudo-random pulse train with the data signal to produce an increased bandwidth signal; and means to phase shift key modulate a coherent RF carrier with the increased bandwidth signal to produce a spread spectrum signal; and wherein a spread spectrum receiver includes; an input for receiving the spread spectrum signal; delay line sections coupled to the input and at least one balanced modulator for combining signals subject to different delays in the delay line sections according to a second predetermined recurrence relationship, the said first second predetermined relationships being such that the delay line sections and at least one balanced modulator derive the said pseudo-random binary pulse train only from the spread spectrum signal, and a further balanced modulator having a first input coupled to the said input for receiving the spread spectrum signal and a second input coupled to receive the said pseudo-random binary pulse train derived from the spread spectrum signal to cross-correlate that pulse train with the signal received at the first input to produce a signal comprising the data demodulated from the pseudo-random binary pulse train. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
Specification