Radio communication system using spread spectrum techniques

A transmitter system for use with a spread spectrum radio communication system, comprising:

• generator means for generating a pseudo-random chipping sequence;
• frequency spreader means for combining digital data with the pseudo-random chipping sequence to produce a spread spectrum signal;
• and,
• modulator means for modulating the spread spectrum signal over a predefined frequency band wherein the pseudo-random chipping sequence is one of a set of codes including non-inverse eleven-bit Barker code, an inverse of the Barker code and a reversed sequence of the inverse or non-inverse Barker code.

A system for receiving spread spectrum radio communication signals, including digital data signals, comprising:

• demodulator means for demodulating broadcast spread spectrum signals;
• de-spreader means employing single bit quantization and oversampling for digitally correlating the output of the demodulator means with a pseudo-random chipping sequence;
• and
• extractor means for extracting clock and data signals from the output of the de-spreader means.

A system for receiving spread spectrum radio communication signals, including digital data signals, comprising:

• demodulator means for demodulating broadcast spread spectrum signals;
• de-spreader means employing single bit quantization and oversampling for digitally correlating the output of the demodulator means with a pseudo-random chipping sequence;
• and
• extractor means for extracting clock and data signals from the output of the de-spreader means wherein the chipping sequence used by the de-spreader is the eleven-bit Barker code, an inverse of the eleven-bit Barker code, and reverse sequences of the inverse and non-inverse Barker code.

A system for receiving spread spectrum radio communication signals, including digital data signals, comprising:

• demodulator means for demodulating broadcast spread spectrum signals;
• de-spreader means employing single bit quantization and oversampling for digitally correlating the output of the demodulator means with a pseudo-random chipping sequence;
• and
• extractor means for extracting clock and data signals from the output of the de-spreader means, wherein the de-spreader means further includes;
• means for digitally over-sampling and delaying a demodulated signal to create blocks of over-sampled data for each binary data bit of the demodulated signal;
• means for digitally multiplying the blocks over-sampled data with the pseudo-random chipping sequence;
• means for digitally summing the blocks of multiplied, over-sampled data into a summation value;
• and,
• means for digitally comparing the summation value with predetermined thresholds.

A spread spectrum radio communication system, comprising:

• generator means for generating a pseudo-random chipping sequence;
• frequency spreader means for combining digital data with the pseudo-random chipping sequence to produce a spread spectrum signal;
• modulator means for modulating the spread spectrum signal for broadcasting over a predefined frequency band;
• demodulator means for demodulating broadcast spread spectrum signals;
• de-spreader means employing single bit quantization and oversampling for digitally correlating the output of the demodulator means with a pseudo-random chipping sequence;
• and
• extractor means for extracting clock and data signals from the output of the de-spreader means.

A spread spectrum radio communication system, comprising:

• generator means for generating a pseudo-random chipping sequence;
• frequency spreader means for combining digital data with the pseudo-random chipping sequence to produce a spread spectrum signal;
• modulator means for modulating the spread spectrum signal for broadcasting over a predefined frequency band;
• demodulator means for demodulating broadcast spread spectrum signals;
• de-spreader means employing single bit quantization and oversampling for digitally correlating the output of the demodulator means with a pseudo-random chipping sequence;
• and
• extractor means for extracting clock and data signals from the output of the de-spreader means, wherein the pseudo-random chipping sequence is selected from a set of codes including a non-inverse eleven-bit Barker code, an inverse of the eleven-bit Barker code and reversed sequences of the inverse and non-inverse Barker code.