5.4.2A PUCCH format 3
36.2113GPPEvolved Universal Terrestrial Radio Access (E-UTRA)Physical channels and modulationRelease 17TS
The block of bits 
shall be scrambled with a UE-specific scrambling sequence, resulting in a block of scrambled bits 
according to
where the scrambling sequence 
is given by clause 7.2. The scrambling sequence generator shall be initialised with 
at the start of each subframe where 
is the C-RNTI.
The block of scrambled bits 
shall be QPSK modulated as described in Clause 7.1, resulting in a block of complex-valued modulation symbols 
where 
.
The complex-valued symbols 
shall be block-wise spread with the orthogonal sequences 
and 
resulting in 
sets of 
values each according to
where 
for both slots in a subframe using normal PUCCH format 3 and 
, 
holds for the first and second slot, respectively, in a subframe using shortened PUCCH format 3. The orthogonal sequences 
and 
are given by Table 5.4.2A-1. Resources used for transmission of PUCCH format 3 are identified by a resource index 
from which the quantities 
and 
are derived according to
Each set of complex-valued symbols shall be cyclically shifted according to
where 
is given by Clause 5.4, 
is the slot number within a radio frame and 
is the SC-FDMA symbol number within a slot.
The shifted sets of complex-valued symbols shall be transform precoded according to
where 
is the number of antenna ports used for PUCCH transmission, resulting in a block of complex-valued symbols 
.
Table 5.4.2A-1: The orthogonal sequence 
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Sequence index |
Orthogonal sequence |
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0 |
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1 |
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2 |
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3 |
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4 |
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