參數(shù)資料
型號(hào)： DSP56600
廠商： 飛思卡爾半導(dǎo)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(shí)現(xiàn)上使用DSP的家庭教學(xué)的VSL
文件頁數(shù)： 81/108頁
文件大?。?/td> 726K
代理商： DSP56600
Extended Algorithm Program Listing
Viterbi Decoder Implementation
For More Information On This Product,
Go to: www.freescale.com
B-3
B.1
16-BIT ENHANCED VITERBI DECODER PROGRAM LISTING
This appendix contains the complete 16-bit program listing for
Section 4
. The code in
this section introduces several modifications to the code discussed in
Section 3
.
Generalized branch metrics are allowed, as well as the optimization of the code that
reduces the computations when data occurs in blocks.
Example B-1
Extended Algorithm Program Listing
OPT
mex
;****************56600**VITERBI DECODER***********************************
; THIS ROUTINE IMPLEMENTS A CONVOLUTIONAL DECODER USING THE VITERBI ALG. IT IS
; OPTIMIZED FOR SPEED, WHICH MEANS THAT EVERY ALU REGISTER AND ALL OF THE R REGISTERS
; ARE USED. A SIGNIFICANT AMOUNT OF THESE CAN BE FREED BY STORING AND REUSING
; REGISTERS BETWEEN THE FINDMETRICS ROUTINES AND THE ACS,ACSFlush ROUTINES.
; INPUT is at INDATA: real in x imag in y. OUTPUT begins at y:DECOUT
; GLOBAL REGISTER USE: a,b,x,y,r012345,n025,m245(are set to a modulo mode)
;*****************BRANCH METRIC MACRO*************************************
;
FUNCTION: Input data and generate branch metrics. This function
;
subtracts the path metric for state 0 from all branch metrics
;
to provide autonormaliztion. For this decoder, the metric is a scaled
;
sum or difference of the real and imag inputs.
;
INPUTS:
;
r2 should point to the beginning of the branch metric table
;
r5 should point to the latest path metric for state 0
;
r1 should point to the next input XY data pair
;
OUTPUTS:
;
Branch metrics are stored at BRX in XY memory
;
REGISTERS USED:
;
a,b,x01,y01,r1,r2,r5, r5 unchanged,r2 unchanged (modulo req'd)
;*****************FINDMETRICS MACRO******************************************
FindMetrics macro
move
x:(r5),a
;st. metric scaling, read last st. 0
neg
a
l:(r1)+,y ;negate metric|grab dec input
move
#-16,x1
;sign for real component, upper br.
mac
x1,y1,a
a,b
;comp 0x partial br. path mt. to
move
y1,x0
;mv real input to x0
mac
x1,y0,a
a,y1
;a gets 00 br. y1 gets 0x partial br
subl
a,b
b,x0
;a has 00 br, b has 11 br, save path
tfr
y1,a
a,y1
;swap 0x and 00 to compute 01 branch
mac
-x1,y0,a
b,x1
;a gets 01 br
tfr
x0,b
b,y0
;swap path metric,11 branch to y0
subl
a,b
y1,x0
;b gets 10 br, x0 has copy of 00 br.
F
Freescale Semiconductor, Inc.
n
.
相關(guān)PDF資料
PDF描述
DSP56852E 16-bit Digital Signal Controllers
DSP56852VFE 16-bit Digital Signal Controllers
DSP56853E 16-bit Digital Signal Controllers
DSP56853FG120 16-bit Digital Signal Controllers
DSP56853FGE 16-bit Digital Signal Controllers
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
DSP56600AD 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:INTERGRATED CELLULAR BASEBAND PROCESSOR DEVELOPMENT IC
DSP56600FM 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:16-BIT DIGITAL SIGNAL PROCESSOR
DSP56602 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:16-Bit Digital Signal Processor User manual
DSP56602AD 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:16-Bit Digital Signal Processor User manual
DSP56602DS 制造商:未知廠家 制造商全稱:未知廠家 功能描述:DSP56602 16-Bit Digital Signal Processor Datasheet
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。

采購需求

(若只采購一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購

我的聯(lián)系方式

*
*
*