IS-95A Rev Ch Interleaver/Deinterleaver (CDMA Reference Blockset)

Interleave or deinterleave a data frame for the Access channel or the reverse Traffic channel

Library

IS-95A Mobile Station Transmitter

Description

This block interleaves or deinterleaves a data frame for the Access channel or reverse Traffic channel. The interleaving time span is 20 ms. The interleaver is a matrix of 32 rows and 18 columns. The interleaver writes the code symbols into the matrix on a column-by-column basis for all of the input data symbols. It then reads the stored data into the output buffer on a row-by-row basis in accordance with the IS-95A specification to achieve the interleaving functionality. The deinterleaver restores the interleaved symbols to the original order.

Inputs

Rate

Integer scalar that specifies the data rate for the input signal. To indicate a rate fraction of Full, Half, Quarter, or Eighth, use an input value of 0, 1, 2, or 3, respectively. The table below shows all valid channel types and rate fractions, along with their associated data rates and Rate input values.


Channel Type	Data Rate (bps)	Input Value
Access (always Half rate)	4800	1
Traffic, Rate Set I, Full	9600	0
Traffic, Rate Set I, Half	4800	1
Traffic, Rate Set I, Quarter	2400	2
Traffic, Rate Set I, Eighth	1200	3
Traffic, Rate Set II, Full	14400	0
Traffic, Rate Set II, Half	7200	1
Traffic, Rate Set II, Quarter	3600	2
Traffic, Rate Set II, Eighth	1800	3

Frame In

Real vector (of binary data for interleaver functionality) of size 576 representing the input frame to be interleaved or deinterleaved.

Outputs

Real vector of (of binary data for interleaver functionality) of size 576 representing the interleaved or deinterleaved output frame.

Dialog Box

Parameters

Channel type: The channel type, either Access or Traffic.
Function: Interleaver or Deinterleaver.

Specification References

IS-95A 6.1.3.1.5
J-STD-008 2.1.3.1.5

IS-95A Rev Ch Detector IS-95A Rev Ch Rake Finger