A METHOD FOR FRAME QUALITY DETECTION AND A RECEIVER

摘要

The invention relates to a method for frame quality detection and a receiver for implementing the method. For frame quality detection, results A and B (27 and 28) are compared with each other and a predetermined threshold value (241) in the method. Result A (27) is formed either as the sum/product of soft bit decisions or as the bit error rate from bursts comprising bits from successive frames N and N + 1. Result B (28) is formed in the same way of frames N - 1 and N. When comparing results A and B (27 and 28) with each other, frame N is determined to be bad if either result (27 or 28) is essentially smaller than the other result (28 or 27). Frame N is also determined to be bad if both results (27 and 28) are smaller than the predetermined threshold value (241). The method improves detection of a bad frame and accordingly reduces the interference sound received by a receiver and caused by erroneously interpreted bad frames, especially during silence.