cancellor off for unreliable bit decisions or to partially disable the cancellor according to the bit reliabilities application_number US 25709494 A description the present invention provides a threshold cancellation means for use in digital mobile radio networks a detailed description thereof using exemplary values follows consider a known short term signal rms voltage a with modulation for the kth symbol m k which is either 1 for a transmitted 34 1 34 or 1 for a transmitted 34 0 34 the signal is received in the presence of noise with variance u03c3 the demodulator makes decisions d k which match m k when correct thus the signal energy component at the output of the canceler when active for the kth symbol is given by the probability distribution of the received voltage r is given by equ1 for a given particular value r of r it is desirable to know whether it is better to cancel or not the problem is that it is not known whether a 1 or 0 was transmitted the reliability of the decision will depend on the modulus of r therefore equ2 using baye 39 s rule and solving for r gives equ3 this implies a threshold which must adapt to the mean levels of noise and signal a simpler solution is to weight the signal before applying to a fixed threshold i e equ4 this requires normalizing.