CHANNEL BER AND SIGNAL QUALITY ESTIMATION FOR TRELLIS CODED MODULATION
Original Publication Date: 1995-Nov-01
Included in the Prior Art Database: 2002-Apr-08
To estimate the integrity of a digital communi- cations channel, it is often desired to compute some type of error metric at the receiver. Two typical error metrics are channel BER (hard decision errors in the channel) and signal quality (variance of soil deci- sion errors). Further, it is desired to accurately esti- mate these metrics in the absence of a prior knowl- edge of the transmitted data. This invention describes method/apparatus to 1) estimate channel BER, 2) compute near exact channel BER, and 3) accurately estimate channel signal quality on a digital commu- nications channel using trellis coded modulation (TCM). TCM is used in both voice and data in the MIRS system, hence, this invention is applicable to estimate channel BER/SQE for MIRS data, voice, and control channels.