lteCFI

Control format indicator block encoding

Syntax

cw = lteCFI(enb)

Description

cw = lteCFI(enb) returns a 32-element vector, cw, that represents the rate 1/16 block encoding of the control format indicator (CFI) value defined in the CFI field of the enb structure.

The value for CFI can be 1, 2, or 3. This value indicates the time span, in OFDM symbols, of the DCI PDCCH transmission (the control region) in that downlink subframe. For bandwidths in which NDLRB is greater than 10 RB, the span of the DCI in OFDM symbols is the same as the actual CFI value. If NDLRB is less than or equal to 10 RB, the span is CFI+1 symbols.

Examples

Encode CFI Value

Generate the 32-element vector that represents block encoding of a CFI value of 2.

cw = lteCFI(struct('CFI',2));
cw(1:10)

ans = 10×1 int8 column vector

   1
   0
   1
   1
   0
   1
   1
   0
   1
   1

Input Arguments

enb — eNodeB cell-wide settings

scalar structure

eNodeB cell-wide settings, specified as a structure containing these parameter fields:

Parameter Field	Required or Optional	Values	Description
CFI	Required	1, 2, or 3 Scalar or if the CFI varies per subframe, a vector of length 10 (corresponding to a frame).	Control format indicator (CFI) value. In TDD mode, CFI varies per subframe for the RMCs ('R.0', 'R.5', 'R.6', 'R.6-27RB', 'R.12-9RB') The value for CFI can be 1, 2, or 3. This value indicates the time span, in OFDM symbols, of the DCI PDCCH transmission (the control region) in that downlink subframe. For bandwidths in which NDLRB is greater than 10 RB, the span of the DCI in OFDM symbols is the same as the actual CFI value. If NDLRB is less than or equal to 10 RB, the span is CFI+1 symbols.

Output Arguments

cw — CFI codeword

integer column vector

CFI codeword, returned as an integer column vector of length 32. This vector represents the 1/16 block encoding of the CFI value defined in structure enb.

Data Types: int8

Version History

Introduced in R2014a