Method and Apparatus for Using Multicarrier Interferometry to Enhance optical Fiber Communications

Abstract

Multicarrier spreading codes map data symbols to a sequence of orthogonal pulse shapes generated from a superposition of orthogonal subcarriers. The orthogonal subcarriers may include OFDM subcarriers, frequency-hopped subcarriers, or chirped subcarriers. Multicarrier spread spectrum may employ a combination of orthogonal frequency division multiple access, time division multiple access, and code division multiple access. Receivers configured to use multi-user detection may employ a combination of time-domain processing and frequency-domain processing.

1 . A multicarrier receiver, comprising: 
 a sampler configured for sampling a plurality of received multicarrier signals to produce a plurality of multicarrier signal values,    a combiner configured for combining the plurality of multicarrier signal values to produce at least one information signal and at least one interference signal, and    a multi-user detector configured to separate the at least one information signal from the at least one interference signal.    
     
     
         2 . The multicarrier receiver recited in  claim 1 , wherein the sampler comprises a filter bank.  
     
     
         3 . The multicarrier receiver recited in  claim 1 , wherein the combiner is adapted to reconstruct time-domain signals occurring in a plurality of time intervals.  
     
     
         4 . The multicarrier receiver recited in  claim 1 , wherein the multi-user detector comprises a phase-space decoder.  
     
     
         5 . The multicarrier receiver recited in  claim 1 , wherein the plurality of received multicarrier signals comprises at least one multicarrier frequency-hopped signal, and the sampler is configured to sample the at least one multicarrier frequency-hopped signal.  
     
     
         6 . A method of receiving a multicarrier signal, comprising: 
 providing for sampling a plurality of received multicarrier signals to produce a plurality of multicarrier signal values,    providing for combining the plurality of multicarrier signal values to produce at least one information signal and at least one interference signal, and    providing for performing multi-user detection to separate the at least one information signal from the at least one interference signal.    
     
     
         7 . The method recited in  claim 6 , wherein providing for sampling comprises filtering.  
     
     
         8 . The method recited in  claim 6 , wherein providing for combining comprises reconstructing time-domain signals occurring in a plurality of time intervals.  
     
     
         9 . The method recited in  claim 6 , wherein providing for performing multi-user detection comprises performing phase-space decoding.  
     
     
         10 . The method recited in  claim 6 , wherein the plurality of received multicarrier signals comprises at least one multicarrier frequency-hopped signal, and providing for sampling is configured to sample the at least one multicarrier frequency-hopped signal.  
     
     
         11 . A system, comprising: 
 a sampling means configured for sampling a plurality of received multicarrier signals to produce a plurality of multicarrier signal values,    a combining means configured for combining the plurality of multicarrier signal values to produce at least one information signal and at least one interference signal, and    a multi-user detection means configured to separate the at least one information signal from the at least one interference signal.    
     
     
         12 . The system recited in  claim 11 , wherein the sampling means comprises a filter bank.  
     
     
         13 . The system recited in  claim 11 , wherein the combining means is adapted to reconstruct time-domain signals occurring in a plurality of time intervals.  
     
     
         14 . The system recited in  claim 11 , wherein the multi-user detection means comprises a phase-space decoder.  
     
     
         15 . The system recited in  claim 11 , wherein the plurality of received multicarrier signals comprises at least one multicarrier frequency-hopped signal, and the sampling means is configured to sample the at least one multicarrier frequency-hopped signal.