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WCDMA3G_OVSF


Description: Orthogonal variable spreading factor codes generator
Library: 3GPPFDD 10-99, Spreading & Modulation
Class: SDFWCDMA3G_OVSF

Parameters

Name

Description

Default

Sym

Type

Range

TypeArray

types of OVSF sequences

8

K

int array

[2, ∞]

IndexArray

index matrix of OVSF sequence

0

 

int array

[0, 2K -1]

Pin Outputs

Pin

Name

Description

Signal Type

1

out

OVSF sequences

multiple int

Notes/Equations
  1. This model is used to generate a single or multiple orthogonal variable spreading factor (OVSF) sequences. The OVSF sequence family has a tree-structure and the length of each OVSF sequence is variable to meet multi-rate transmission. The number of maximal length of these OVSF sequences output tokens are produced for each output signal.
  2. The matrix size of TypeArray must be equal to that of IndexArray.
    TypeArray specifies the length of the multiple OVSF codes to be generated. For example, "4 5 6" means the length of the three codes are 16, 32 and 64, respectively. IndexArray specifies the index of the output code within the code family of the given length.
  3. The layered spreading sequences are generated from the recursions:


    = 1

    .
    .
    .

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