參數(shù)資料
型號: DSP56600
廠商: 飛思卡爾半導體(中國)有限公司
英文描述: Implementing Viterbi Decoders Using the VSL Instruction on DSP Families
中文描述: 維特比解碼器實現(xiàn)上使用DSP的家庭教學的VSL
文件頁數(shù): 68/108頁
文件大?。?/td> 726K
代理商: DSP56600
5-4
Viterbi Decoder Implementation
For More Information On This Product,
Go to: www.freescale.com
Summary
Program Listings
Table 5-1
Viterbi Decoder Code Statistics
Another statistic worth noting is the program memory required by each program. The
basic Viterbi decoder code in
Section 3
takes 178 program words, and the code in
Section 4
with all enhancements added takes 311. The large increase is mostly due to the
unrolling of some loops at the end, required to phase the ACSFlush and STOREPATHS
macros correctly. Notably, the amount of program space required for either routine is
quite small, and may not be a large consideration for most systems.
5.3
PROGRAM LISTINGS
Finally, note that there are three appendices to this application report. Each appendix
contains a program listing for the program as described on one of the sections of this
manual.
Appendix A
contains a listing for the complete code discussed in
Section 3
.
Appendix B
contains a complete listing of the code discussed in
Section 4
.
Appendix C
contains a complete listing of a 24-bit version of the
Section 4
code,
suitable for implementation on a DSP56300 DSP operating in 24-bit arithmetic
mode.
Code Used
Total Clock
Cycles
Clock Cycles per
Information Bit
MIPS at 13,350
Data Rate
%
change
Basic Viterbi
36127
215.04
2.87
Viterbi with
generalized
branch metrics
36668
218.26
3.31
+1.5%
+ACSFlush
36065
214.67
2.87
-0.172%
+Pre ACS
35459
211.07
2.81
-1.85%
F
Freescale Semiconductor, Inc.
n
.
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