Operating Manual Vol 1 - ES Documentation

Digital Standard 3GPP W-CDMA (FDD)SMIQFig. 2-133Signal consisting of P-CCPCH, P-SCH and S-SCH in time domainThe above diagram reveals that a time slot consists of 2560 chips and the power is higher with the first10% of the signal. This is the SCH. Zooming in on this transition point reveals the following:Fig. 2-134Signal consisting of P-CCPCH, P-SCH and S-SCH in time domain (zoomed)The right section (i.e. the 9 PCCPCH symbols) is spread as described in Fig. 2-90. You can see that foreach symbol clock one of the two components is 0 and the other one ±2 (a certain inaccuracy resultsfrom the root cosine filter used).This is the standard spreading scheme as it is also used for S-CCPCH, DPCH and all other downlinkchannel types.The left section (the synchronization code symbol occupying the chip range 0 to 255) is obtained usingspecial synchronization code spreading: there is no scrambling unit ( S i = C i , S q = C q ).1125.5555.03 2.220E-9