Skip to content
Projects
Groups
Snippets
Help
Loading...
Help
Support
Keyboard shortcuts
?
Submit feedback
Contribute to GitLab
Sign in / Register
Toggle navigation
O
OpenXG UE
Project overview
Project overview
Details
Activity
Releases
Repository
Repository
Files
Commits
Branches
Tags
Contributors
Graph
Compare
Issues
0
Issues
0
List
Boards
Labels
Milestones
Merge Requests
0
Merge Requests
0
CI / CD
CI / CD
Pipelines
Jobs
Schedules
Analytics
Analytics
CI / CD
Repository
Value Stream
Wiki
Wiki
Snippets
Snippets
Members
Members
Collapse sidebar
Close sidebar
Activity
Graph
Create a new issue
Jobs
Commits
Issue Boards
Open sidebar
Michael Black
OpenXG UE
Commits
dfbef96b
Commit
dfbef96b
authored
Dec 16, 2014
by
Florian Kaltenberger
Browse files
Options
Browse Files
Download
Email Patches
Plain Diff
git-svn-id:
http://svn.eurecom.fr/openair4G/trunk@6270
818b1a75-f10b-46b9-bf7c-635c3b92a50f
parent
3e85fff3
Changes
1
Show whitespace changes
Inline
Side-by-side
Showing
1 changed file
with
47 additions
and
0 deletions
+47
-0
targets/PROJECTS/CORRIDOR/init_dpss.m
targets/PROJECTS/CORRIDOR/init_dpss.m
+47
-0
No files found.
targets/PROJECTS/CORRIDOR/init_dpss.m
0 → 100644
View file @
dfbef96b
function
p_dpss
=
init_dpss
(
p
,
tau_max
)
%% init DPSS
% channel parameters
theta_max
=
tau_max
*
p
.
frame_length
*
100
/
p
.
useful_carriers
;
% TS = 1/(p.frame_length*100)
N_sub
=
floor
(
theta_max
*
p
.
useful_carriers
)
+
1
;
% number of approximate subspace dimensions
%N_sub = 1;
% DPSS generation
nDmax
=
min
(
ceil
(
N_sub
*
1.25
),
p
.
useful_carriers
);
[
Udps
,
Sdps
]
=
dpss
(
p
.
useful_carriers
,
theta_max
*
p
.
useful_carriers
/
2
,
nDmax
);
% the fftshift is needed dependig in which format the frequency response is used
%V=fftshift(diag(exp(-2*pi*1i*theta_max/2*(0:(p.nN-1))))*Udps);
p_dpss
.
V
=
diag
(
exp
(
-
2
*
pi
*
1
i
*
theta_max
/
2
*
(
0
:(
p
.
useful_carriers
-
1
))))
*
Udps
;
% compute the optimal subspace dimension based on the expected SNR
p_dpss
.
SNR
=
0
:
30
;
for
SNR
=
p_dpss
.
SNR
% calculate optimum subspace dimension as bias variance tradeoff for a
% given noise variance (assuming pilot symbols with energy one)
sigma2
=
10.
^
(
-
SNR
/
10
);
[
~
,
p_dpss
.
Dopt
(
SNR
+
1
)]
=
findminimumd
(
sigma2
,
p
.
useful_carriers
,
nDmax
,
1
/
theta_max
*
Sdps
);
end
% % precompute the filters for DPSS estimation for the required number of
% % basis function
% Dvec = min(Dopt):max(Dopt);
% for ind=1:length(Dvec)
% Dind = Dvec(ind);
%
% for itx=1:p.nant_tx
% % f_start and t_start indicate the start of the pilots in time
% % and frequency according to the specifications (see .doc file).
% % t_start has to be >=2, since the first symbol is the PSS.
% f_start = mod(itx-1,2)*2+1;
% t_start = floor((itx-1)/2)+1;
%
% % filter for DPSS channel estimation
% M = conj(diag(squeeze(transmit_f(itx,t_start,f_start:4:end))) * V(f_start:4:end,1:Dind));
% Mpinv = (M'*M)\M.';
% % to compute the basis coefficients do
% % psi = Mpinv*(symb0(2:6:end));
%
% end
%
% end
Write
Preview
Markdown
is supported
0%
Try again
or
attach a new file
Attach a file
Cancel
You are about to add
0
people
to the discussion. Proceed with caution.
Finish editing this message first!
Cancel
Please
register
or
sign in
to comment