Spread spectrum reception using a reference code signal

Abstract

A spread spectrum signal is received. The received spread spectrum signal is despread using a reference code signal, as a despread reference code signal. The received spread spectrum signal is despread using at least one message code signal, as at least one despread message code signal and using the despread reference code signal as a phase reference for the despreading of the received spread spectrum signal using the at least one message code signal. Data from the at least one despread message code signal is recovered.

1 . A method comprising: 
 receiving a spread spectrum signal;    despreading the received spread spectrum signal using a reference code signal, as a despread reference code signal;    despreading the received spread spectrum signal using at least one message code signal, as at least one despread message code signal and using the despread reference code signal as a phase reference for the despreading of the received spread spectrum signal using the at least one message code signal; and    recovering data from the at least one despread message code signal.    
   
   
       2 . The method of  claim 1  wherein the at least one despread message code signal is a plurality of despread message code signals.  
   
   
       3 . The method of  claim 1  comprising recovering a carrier signal from the despreading using the reference code signal.  
   
   
       4 . The method of  claim 1  wherein the despread reference code signal has a known data bit sequence.  
   
   
       5 . The method of  claim 4  wherein the known data bit sequence is a code word.  
   
   
       6 . The method of  claim 1  wherein the reference code signal and the at least one message code signal are chip code signals.  
   
   
       7 . A spread spectrum receiver comprising: 
 an input configured to receive a spread spectrum signal;    a reference despreading device configured to despread the received spread spectrum signal using a reference code signal, as a despread reference code signal;    a message despreading device configured to despread the received spread spectrum signal using at least one message code signal, as at least one despread message code signal and the message despreading device configured to have a phase reference derived from the despread reference code signal; and    a data detector device configured to recover data from the at least one despread message code signal.    
   
   
       8 . The spread spectrum receiver of  claim 7  wherein the at least one despread message code signal is a plurality of despread message code signals.  
   
   
       9 . The spread spectrum receiver of  claim 7  wherein the reference despreading device is configured to recovering a carrier signal.  
   
   
       10 . The spread spectrum receiver of  claim 7  wherein the despread reference code signal has a known data bit sequence.  
   
   
       11 . The spread spectrum receiver of  claim 10  wherein the known data bit sequence is a code word.  
   
   
       12 . The spread spectrum receiver of  claim 7  wherein the reference code signal and the at least one message code signal are chip code signals.  
   
   
       13 . A spread spectrum communication system comprising: 
 a spread spectrum transmitter comprising:    a reference code spreading device configured to produce a spread reference code signal using a reference code signal;    a message code spreading device configured to spread data using at least one message code signal, producing spread message code data;    a combining device configured to combine the spread reference code signal and the spread message code data, producing a combined signal;    a modulator configured to modulate the combined signal to radio frequency for transmission as a spread spectrum signal;    a spread spectrum receiver comprising: 
 an input configured to receive the spread spectrum signal;  
 a reference despreading device configured to despread the received spread spectrum signal using a replica reference code signal, as a despread reference code signal;  
   a message despreading device configured to despread the received spread spectrum signal using at least one replica message code signal, as at least one despread message code signal and the message despreading device configured to have a phase reference derived from the despread reference code signal; and    a data detector device configured to recover data from the at least one despread message code signal.    
   
   
       14 . The spread spectrum system of  claim 13  wherein the at least one message code signal is a plurality of message code signals.  
   
   
       15 . The spread spectrum system of  claim 13  wherein the reference despreading device is configured to recovering a carrier signal.  
   
   
       16 . The spread spectrum system of  claim 13  wherein the despread reference code signal has a known data bit sequence.  
   
   
       17 . The spread spectrum system of  claim 16  wherein the known data bit sequence is a code word.  
   
   
       18 . The spread spectrum system of  claim 13  wherein the reference code signal and the at least one message code signal are chip code signals.