Patent ID: 6804314
Filing Date: 2004-10-12
Classification: H04B,H04J,H04W

Abstract:
A synchronism judgment apparatus comprising:a receiving mode identifying section for identifying a receiving mode suitable for a frame actually received or to be received, from a normal receiving mode wherein a frame as a sequence of consecutive slots is received and a specific receiving mode wherein a frame as a sequence of slots intermittently transmitted is received; a threshold value selecting section for selecting a threshold value corresponding to said identified receiving mode from a threshold value suitable for said normal receiving mode and a threshold value suitable for said specific receiving mode and smaller than the threshold value suitable for said normal receiving mode; and a judging section for judging whether frame synchronization has been established, by comparing magnitude of values between number of bits in sync patterns and said selected threshold value, said number of bits in said sync patterns being a number of bits in said sync patterns having different values compared to bits in known reference sync patterns, and said sync patterns dispersively distributed to respective slots included in said frame actually received or to be received.