diff options
Diffstat (limited to 'viterbi_generator/tests/utils/make_stops.m')
| -rw-r--r-- | viterbi_generator/tests/utils/make_stops.m | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/viterbi_generator/tests/utils/make_stops.m b/viterbi_generator/tests/utils/make_stops.m new file mode 100644 index 0000000..98734c9 --- /dev/null +++ b/viterbi_generator/tests/utils/make_stops.m @@ -0,0 +1,67 @@ +function [ STOPS ] = make_stops(Lh,SYMBOLS) +% +% MAKE_STOPS: +% This code returns a statenumber corresponding to the set of +% legal stop states as found from Lh. The method is to use the table +% of symbolic stop states as it is listed in the report made +% by 95gr870T. For the table lookups are made in SYMBOLS. in +% order to map from the symbol representation to the state number +% representation. +% +% SYNTAX: [ STOPS ] = make_stops(Lh,SYMBOLS) +% +% INPUT: SYMBOLS: The table of symbols corresponding the the state- +% numbers. +% Lh: Length of the estimated impulseresponse. +% +% OUTPUT: STOPS: The number representation of the set of legal stop +% states. +% +% SUB_FUNC: None +% +% WARNINGS: The table of symbolic representations has not been verified +% but is used directly as it is listed in the report made +% by 95gr870T. +% +% TEST(S): The function has been verified to return a state number +% which matches the symbolic representation. +% +% AUTOR: Jan H. Mikkelsen / Arne Norre Ekstrøm +% EMAIL: hmi@kom.auc.dk / aneks@kom.auc.dk +% +% $Id: make_stops.m,v 1.2 1997/09/22 11:44:21 aneks Exp $ + +% OBTAIN THE SYMBOLS FROM Lh. THIS IS THE TABLE LISTED IN THE REPORT MADE +% BY 95gr870T. (SATEREPRESENTATION IS SLIGHTLY CHANGED). +% +if Lh==1, + stop_symbols = [ -1 ]; + count=1; +elseif Lh==2, + stop_symbols = [ -1 j ]; + count=1; +elseif Lh==3, + stop_symbols = [ -1 j 1 ]; + count=1; +elseif Lh==4, + stop_symbols = [ [ -1 j 1 j ] ; [ -1 j 1 -j ] ]; + count=2; +elseif Lh==5, + stop_symbols = [ [ -1 j 1 j -1] ; [ -1 j 1 -j -1] ; [ -1 j 1 j 1] ; [ -1 j 1 -j 1] ]; + count=2; +else + fprintf('\n\nError: Illegal value of Lh, terminating...'); +end + +% NOW THAT WE HAVE THE SYMBOL REPRESENTATION THE REMAINING JOB IS +% TO MAP THE MSK SYMBOLS TO STATE NUMBERS +% +index = 0; +stops_found=0; +while stops_found < count, + index=index+1; + if sum(SYMBOLS(index,:)==stop_symbols(stops_found+1,:))==Lh, + stops_found=stops_found+1; + STOPS(stops_found)=index; + end +end |