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WCDMA3G_PSCode


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

Pin Outputs

Pin

Name

Description

Signal Type

1

out

primary synchronization code

int

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.
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