Detection and mitigation of temporary (bursts) impairments in channels using scdma

Abstract

Systems and methods are disclosed for detecting and mitigating temporary high-level impairments, in a communications channel, and subsequently, mitigating the deleterious effects of the dynamic impairments. The system includes a transmitter and a receiver. The transmitter is adapted to transmit at least one set of modulated signals. The receiver is adapted to receive the at least one set of modulated signals and mitigate temporary high-level impairment in the at least one set of modulated signals using at least one error vector received during the temporary high-level impairment.

1 . An apparatus, comprising:
 an input to receive a signal including a plurality of concurrently modulated symbols having temporary impairment; and   a processor to mitigate the temporary impairment in accordance with processing based upon a function of error vectors associated with the signal thereby generating a processed signal.   
     
     
         2 . The apparatus of  claim 1 , further comprising:
 at least one additional apparatus including a transmitter to transmit the signal including the plurality of concurrently modulated symbols via a communication channel to the apparatus; and wherein:   during transmission via the communication channel, the signal including the plurality of concurrently modulated symbols incurring the temporary impairment;   the temporary impairment being temporary high-level or severe impairment; and   the signal being a synchronous code division multiple access (SCDMA) signal.   
     
     
         3 . The apparatus of  claim 1 , wherein:
 the input to receive a plurality of signals, including the signal including the plurality of concurrently modulated symbols having temporary impairment; and   the function of error vectors associated with each signal of the plurality of signals.   
     
     
         4 . The apparatus of  claim 1 , wherein:
 the processor to mitigate the temporary impairment by weighting the plurality of concurrently modulated symbols with at least one modified likelihood based upon the function of error vectors associated with the signal.   
     
     
         5 . The apparatus of  claim 1 , wherein:
 the processor to mitigate the temporary impairment by erasing the plurality of concurrently modulated symbols based upon the function of error vectors associated with the signal.   
     
     
         6 . The apparatus of  claim 1 , wherein:
 the function of error vectors associated with the signal being a function of error powers associated with the signal; and   the processor to compare a sum of the error powers with a threshold.   
     
     
         7 . The apparatus of  claim 1 , wherein:
 the processor to discard at least one of the error vectors having an extreme value.   
     
     
         8 . The apparatus of  claim 1 , further comprising:
 a notched filter to process the processed signal to mitigate at least one additional deleterious effect within the signal or the processed signal.   
     
     
         9 . An apparatus, comprising:
 an input to receive a signal including a plurality of concurrently modulated symbols having temporary impairment, wherein the temporary impairment including narrowband interference and time-domain burst noise;   a processor to mitigate the time-domain burst noise in accordance with processing based upon a function of error vectors associated with the signal thereby generating a processed signal; and   a notched filter to process the processed signal to mitigate the narrowband interference.   
     
     
         10 . The apparatus of  claim 9 , wherein:
 at least one coefficient of the notched filter being adapted for use in at least one subsequent filtering operation.   
     
     
         11 . The apparatus of  claim 9 , further comprising:
 at least one additional apparatus including a transmitter to transmit the signal including the plurality of concurrently modulated symbols via a communication channel to the apparatus; and wherein:   during transmission via the communication channel, the signal including the plurality of concurrently modulated symbols incurring the temporary impairment;   the temporary impairment including temporary high-level or severe impairment; and   the signal being a synchronous code division multiple access (SCDMA) signal.   
     
     
         12 . The apparatus of  claim 9 , wherein:
 the processor to mitigate the time-domain burst noise by weighting the plurality of concurrently modulated symbols with at least one modified likelihood based upon the function of error vectors associated with the signal.   
     
     
         13 . The apparatus of  claim 9 , wherein:
 the processor to mitigate the time-domain burst noise by erasing the plurality of concurrently modulated symbols based upon the function of error vectors associated with the signal.   
     
     
         14 . The apparatus of  claim 9 , wherein:
 the function of error vectors associated with the signal being a function of error powers associated with the signal; and   the processor to compare a sum of the error powers with a threshold.   
     
     
         15 . An apparatus, comprising:
 an input to receive a signal including a plurality of concurrently modulated symbols having temporary impairment; and   a processor to:
 make a plurality of decisions on the plurality of concurrently modulated symbols; 
 re-modulate the plurality of decisions thereby generating a plurality of remodulated symbols; 
 mitigate the temporary impairment in accordance with processing based upon a function of error vectors associated with the plurality of remodulated symbols thereby generating a processed signal. 
   
     
     
         16 . The apparatus of  claim 15 , further comprising:
 at least one additional apparatus including a transmitter to transmit the signal including the plurality of concurrently modulated symbols via a communication channel to the apparatus; and wherein:   during transmission via the communication channel, the signal including the plurality of concurrently modulated symbols incurring the temporary impairment;   the temporary impairment being temporary high-level or severe impairment; and   the signal being a synchronous code division multiple access (SCDMA) signal.   
     
     
         17 . The apparatus of  claim 15 , wherein:
 the processor to mitigate the temporary impairment by weighting the plurality of concurrently modulated symbols with at least one modified likelihood based upon the function of error vectors associated with the signal.   
     
     
         18 . The apparatus of  claim 15 , wherein:
 the processor to mitigate the temporary impairment by erasing the plurality of concurrently modulated symbols based upon the function of error vectors associated with the signal.   
     
     
         19 . The apparatus of  claim 15 , wherein:
 the function of error vectors associated with the signal being a function of error powers associated with the signal; and   the processor to compare a sum of the error powers with a threshold.   
     
     
         20 . The apparatus of  claim 15 , further comprising:
 a notched filter to process the processed signal to mitigate at least one additional deleterious effect within the signal or the processed signal.