Dynamic measurement of communication channel characteristics using direct sequence spread spectrum (DSSS) systems, methods and program products

A system of dynamic measurement of a communication channel using Direct Sequence Spread Spectrum (DSSS) communication system, comprising:

• (a) code generating apparatus which generates a Pseudo Noise (PN) code where (γ0=1/T);
• (b) carrier modulating apparatus which modulates a carrier (cos. 2Σγc) with the PN code;
• (c) data modulating apparatus which modulates the PN coded carrier with a data signal [m(t)];
• (d) transmitter apparatus which transmits the PN coded data signal [s(t)] to a correlator via a communication channel for determining transmission characteristics of the channel;
• (e) frequency-controlling apparatus that tunes the carrier frequency to predetermined frequencies relevant for the transmission of the data content;
• (f) decoding apparatus which determines a correlator value for each frequency for extracting the PN code from the coded data signal;
• and
• (g) analysis apparatus which keeps track of the correlator values and thereby determines the frequency dependent loss of the transmission channel.

A system of dynamic measurement of a communication channel using Direct Sequence Spread Spectrum (DSSS) communication system, comprising:

• (a) code generating apparatus which generates a Pseudo Noise (PN) code where (γ0=1/T);
• (b) carrier modulating apparatus which modulates a carrier (cos. 2Σγc) with the PN code;
• (c) data modulating apparatus which modulates the PN coded carrier with a data signal [m(t)];
• (d) transmitter apparatus which transmits the PN coded data signal [s(t)] to a correlator via a communication channel for determining transmission characteristics of the channel;
• (e) selecting apparatus which select a Signal to Noise Ratio as a threshold for reliable communication in the channel;
• (f) decoding apparatus which determines a correlator value for extracting the PN code from the coded data signal;
• (g) comparison apparatus which compares the correlation value of the PN code to the threshold value;
• and
• (h) analysis apparatus which determines if the correlation variable is above or below the threshold;
• where a correlation value below the threshold is indicative of unreliable transmission through the channel and a correlator value above the threshold is indicative or reliable transmission through the channel.

A method of dynamic measurement of a communication channel using Direct Sequence Spread Spectrum (DSSS) communication system, comprising the steps of:

• (a) generating a Pseudo Noise (PN) code where (γ0=1/T);
• (b) modulating a carrier (cos. 2Σγc) with the PN code;
• (c) modulating the PN coded carrier with a data signal [m(t)];
• (d) providing the PN coded data signal [s(t)] plus a channel noise signal to a correlator via a communication channel for determining transmission characteristics of the channel;
• (e) selecting a Signal to Noise Ratio as a threshold for reliable communication in the channel;
• (f) determining a correlator value for extracting the PN code from the coded data signal;
• (g) comparing the correlation value of the PN code to the threshold value;
• and
• (h) determining if the correlation variable is above or below the threshold;
• where a correlation value below the threshold is indicative of unreliable transmission through the channel and a correlator value above the threshold is indicative or reliable transmission through the channel.

A system of dynamic measurement of a communication channel using Direct Sequence Spread Spectrum (DSSS) communication system, comprising:

• (a) code generating apparatus which generates a Pseudo Noise (PN) code where (γ0=1/T);
• (b) carrier modulating apparatus which modulates a carrier (cos. 2Σγc) with the PN code;
• (c) data modulating apparatus which modulates the PN coded carrier with a data signal [m(t)];
• (d) transmitter apparatus which transmits the PN coded data signal [s(t)] to a correlator via a communication channel for determining transmission characteristics of the channel;
• (e) selecting apparatus which select a Signal to Noise Ratio as a threshold for reliable communication in the channel;
• (f) decoding apparatus which determines a correlator value for extracting the PN code from the coded data signal;

The medium of claim 17 further comprising

• (e) program instructions selecting a Signal to Noise Ratio as a threshold for reliable communication in the channel;
• (f) program instructions comparing the correlation value to this threshold;
• and
• (g) program instructions determining if the correlation value is above or below the threshold, where a correlation value below the threshold is indicative of unreliable transmission trough the channel.