WCDMA3G PSCode

WCDMA3G_PSCode

Description: Primary synchronization code generator
Library: 3GPPFDD 10-99, Common Physical Channels
Class: SDFWCDMA3G_PSCode

Pin Outputs

Notes/Equations

1. This model is used to generate the primary synchronization code in one slot.
   Each firing, 256 tokens are produced.
2. The primary synchronization channel (primary SCH) consists of a modulated code of length of 256 chips-the primary synchronization code (PSC). The primary code sequence is same in every slot. It is constructed as a generalized hierarchical Golay sequence. The primary SCH is chosen to have good aperiodic auto correlation properties.
   Let

   a = <x1, x2, x3, ..., x16> = <0,0,0,0,0,0,1,1,0,1,0,1,0,1,1,0>

   The PSC code is generated by repeating sequence a modulated by a Golay complementary sequence.
   Let

   y = <>

   The definition of the PSC code word follows (the left-most index corresponds to the chip transmitted first in each time slot):

   PSC code = <y(0), y(1), y(2), ... , y(255)>.

   PSC binary code word is converted to real valued sequence by the transformation `0' -> `+1' and '1' -> `−1'.
   PSC code is unique in the entire system.

References

1. 3GPP Technical Specification TS 25.213 V3.0.0, "Spreading and Modulation (FDD)," October 1999.