Application: The Synchronization channel carries the Synchronization message at a rate of 1200 bits/sec. The bits are protected by rate 1/2 convolutional encoding, yielding 2400 sym/sec, and then repeated for protection to form a stream at 4800 sym/sec. The 4800 sym/sec stream is interleaved 128 symbols at a time spanning exactly 26.666... msec, which equals the period of the pilot code. Walsh word 32, consisting of 32 binary zeros followed by 32 binary ones is used to identify the Synchronization channel. The 32 zeros and 32 ones of Walsh word 32 may be viewed as a square wave which is zero for about 26.04 µsec and then one for 26.04 µsec. having a bandwidth of about 38.4 kHz. This signal is then PN spread to the approximate 1.25 MHz of the physical channel by the pilot PN codes. Power control is not used on the Synchronization channel.

See Synchronization Message.

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© 1999 DR. ERNEST SIMO - SPACE2000