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WCDMA3G_QPSKDataMap


Description: QPSK modulation
Library: 3GPPFDD 10-99, Spreading & Modulation
Class: SDFWCDMA3G_QPSKDataMap

Parameters

Name

Description

Default

Type

MappingRule

mapping rule.: Map 0 to 1, Map 1 to 1, Do not map

Map 0 to 1

enum

Pin Inputs

Pin

Name

Description

Signal Type

1

inBit

input bit stream

int

Pin Outputs

Pin

Name

Description

Signal Type

2

out

output mapped symbol

complex

Notes/Equations
  1. This model is used to form an orthogonal signal denoted by a complex symbol from the input bit stream. Each firing, one complex token is produced when two integer tokens are consumed.
  2. The following table shows the mapping algorithm; generally, Map 0 to 1 is used.
  3. DTX indication bits are neither 0 nor 1, when input bit is DTX indication, it will be mapped to 0. With another mapped bit 0, 1 or −1, a complex symbol is produced.
    QPSK Mapping Rule
    Map 0 to 1 Map 1 to 1 Do not map
    in out in out in out
    0, 0 (1, 1) 0, 0 (-1, -1) 0, 0 (0, 0)
    0, 1 (1, -1) 0, 1 (-1, 1) 0, 1 (0, 1)
    1, 0 (-1, 1) 1, 0 (1, -1) 1, 0 (1, 0)
    1, 1 (-1, -1) 1, 1 (1, 1) 1, 1 (1, 1)
    symbol (x, y) denotes a complex signal x + iy

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