Channel estimation based on noise power

Abstract

Disclosed are various embodiments providing processor configured to determine a received signal strength indication (RSSI) value for each of the plurality of channel taps. The processing circuitry identifies a maximum RSSI value among the RSSI values and may adjust a variable threshold range according to the maximum RSSI value. The RSSI value for each channel tap may be scaled according to a corresponding per tap noise power.

Therefore, at least the following is claimed: 
     
         1 . A method for a processing circuit comprising:
 generating a set of symbols for a channel tap among a plurality of channel taps based at least upon a multipath signal;   generating a signal power estimation based at least upon a filtering of the set of symbols by a channel estimation filter;   generating a received signal strength indication (RSSI) signal based at least upon the signal power estimation;   determining a noise power estimation for the channel tap based at least upon a portion of the set of symbols; and   scaling the RSSI signal based at least upon the noise power estimation to generate a scaled RSSI signal.   
     
     
         2 . The method of  claim 1 , further comprising setting the channel tap to a lock status based at least upon the scaled RSSI signal and a predetermined threshold range. 
     
     
         3 . The method of  claim 2 , wherein the predetermine threshold range is variable. 
     
     
         4 . The method of  claim 3 , wherein the predetermine threshold range is adjusted according to a maximum RSSI signal among the plurality of channel taps. 
     
     
         5 . The method of  claim 3 , wherein the predetermine threshold range is adjusted according to a maximum scaled RSSI signal among the plurality of channel taps. 
     
     
         6 . The method of  claim 1 , wherein determining the noise power estimation comprises subtracting a pair of consecutive symbols of the set of symbols. 
     
     
         7 . A system for signal processing, comprising:
 a channel tap configured to obtain at least a portion of a multi-channel signal for generating a corresponding tap output;   a received signal strength indication (RSSI) filter configured to generate an RSSI signal based at least upon a signal power estimation of the tap output; and   a lock detector configured to set the channel tap to a lock status based at least upon the RSSI signal and a predetermined threshold amount.   
     
     
         8 . The system of  claim 7 , further comprising a channel estimation filter configured to generate a channel estimation signal based at least upon the tap output. 
     
     
         9 . The system of  claim 8 , wherein the channel estimation filter comprises a one-pole infinite impulse response filter. 
     
     
         10 . The system of  claim 8 , further comprising a power estimator configured to generate the signal power estimation based at least upon the channel estimation signal. 
     
     
         11 . The system of  claim 7 , wherein the channel tap is one of a plurality of channel taps. 
     
     
         12 . The system of  claim 11 , wherein the predetermined threshold amount is configured to be adjusted according to respective signal powers corresponding to each of the plurality of channel taps. 
     
     
         13 . The system of  claim 11 , wherein the predetermined threshold amount comprises an upper threshold and a lower threshold, wherein the upper threshold and lower threshold are configured to be adjusted. 
     
     
         14 . The system of  claim 13 , wherein the upper threshold and lower threshold are configured to be adjusted according to a maximum RSSI signal, the maximum RSSI signal being determined among the plurality of channel taps. 
     
     
         15 . The system of  claim 7 , wherein the RSSI filter is further configured to round a value expressed in the RSSI signal according to a predetermined number of digits. 
     
     
         16 . A system comprising:
 processing circuitry configured to:
 determine received signal strength indication (RSSI) value for each of the plurality of channel taps; 
 identify a maximum RSSI value among the RSSI values; and 
 adjust a variable threshold range according to the maximum RSSI value. 
   
     
     
         17 . The system of  claim 16 , wherein the processing circuitry is further configured to modify a lock status associated with a channel tap in response to the corresponding RSSI value of the channel tap being outside the variable threshold range. 
     
     
         18 . The system of  claim 16 , wherein the processing circuitry is further configured to hold a lock status associated with a channel tap in response to the corresponding RSSI value of the channel tap being within the variable threshold range. 
     
     
         19 . The system of  claim 16 , wherein the processing circuitry is further configured to determine a respective noise power value for each of the plurality of channel taps. 
     
     
         20 . The system of  claim 19 , wherein the processor is further configured to scale the RSSI filter signal on a per-slot basis.