Filter Co-Processor
Operation Modes
MOTOROLA
DSP56305 User’s Manual
12-37
12.5.8.2
Mode 3 (Complex Correlation of 2
×
Oversampled Data), No
Decimation
The received training sequence is 2
×
oversampled (two pairs of I&Q samples per bit).
The midamble sequence consists of alternate pure real/pure imaginary values (one pure
complex value per bit). Before correlation, the midamble should be interpolated by 2.
Refer to the following table:
Table 12-9
2
×
Oversampled Data Sequence
Taking advantage of the “zero” components of the interpolated midamble sequence, we
get the following equations from the basic correlation equations:
When n is even, the filter outputs are independent of the odd input samples, and when n
is odd, the filter outputs are independent of the even input samples. As a result, even
and odd outputs can be calculated separately, requiring half of the data memory bank
size.
Sample
(index)
Bit #
Received
Input
Received
Quadrature
Midamble
Input
Midamble
Quadrature
0
0
DR(0)
DI(0)
HR(0)
0
1
DR(1)
DI(1)
0
0
2
1
DR(2)
DI(2)
0
HI(2)
3
DR(3)
DI(3)
0
0
4
2
DR(4)
DI(4)
HR(4)
0
5
DR(5)
DI(5)
0
0
6
3
DR(6)
DI(6)
0
HI(6)
7
DR(7)
DI(7)
0
0
FR n
( )
HR 4i
( )
DR n
4i
+
(
)
⋅
(
)
HI 4i
2
+
(
)
DI n
4i
2
+
+
(
)
⋅
(
)
+
i
0
=
N 4
⁄
1
–
∑
=
FI n
( )
HR 4i
( )
DI n
4i
+
(
)
⋅
(
)
HI 4i
2
+
(
)
DR n
4i
2
+
+
(
)
⋅
(
)
–
i
0
=
N 4
⁄
1
–
∑
=
Содержание DSP56305
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Страница 58: ...1 18 DSP56305 User s Manual MOTOROLA DSP56305 Overview DSP56305 Architecture Overview ...
Страница 59: ...MOTOROLA DSP56305 User s Manual 2 1 SECTION 2 SIGNAL CONNECTION DESCRIPTIONS ...
Страница 98: ...2 40 DSP56305 User s Manual MOTOROLA Signal Connection Descriptions JTAG OnCE Interface ...
Страница 99: ...MOTOROLA DSP56305 User s Manual 3 1 SECTION 3 MEMORY CONFIGURATION ...
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Страница 144: ...4 26 DSP56305 User s Manual MOTOROLA Core Configuration JTAG Boundary Scan Register BSR ...
Страница 145: ...MOTOROLA DSP56305 User s Manual 5 1 SECTION 5 GENERAL PURPOSE I O ...
Страница 146: ...5 2 DSP56305 User s Manual MOTOROLA General Purpose I O 5 1 Introduction 5 3 5 2 Programming Model 5 3 ...
Страница 149: ...HOST INTERFACE HI32 MOTOROLA DSP56305 User s Manual 6 1 SECTION 6 HOST INTERFACE HI32 ...
Страница 150: ...6 2 DSP56305 User s Manual MOTOROLA HOST INTERFACE HI32 ...
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Страница 315: ...MOTOROLA DSP56305 User s Manual 8 1 SECTION 8 SERIAL COMMUNICATION INTERFACE SCI ...
Страница 346: ...8 32 DSP56305 User s Manual MOTOROLA Serial Communication Interface SCI GPIO Signals and Registers ...
Страница 347: ...MOTOROLA DSP56305 User s Manual 9 1 SECTION 9 TIMER EVENT COUNTER ...
Страница 376: ...9 30 DSP56305 User s Manual MOTOROLA Timer Event Counter Timer Modes of Operation ...
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Страница 410: ...10 34 DSP56305 User s Manual MOTOROLA On Chip Emulation Module Examples of JTAG and OnCE interaction ...
Страница 411: ...MOTOROLA DSP56305 User s Manual 11 1 SECTION 11 JTAG PORT ...
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Страница 431: ...Filter Co Processor MOTOROLA DSP56305 User s Manual 12 1 SECTION 12 FILTER CO PROCESSOR ...
Страница 471: ...VITERBI CO PROCESSOR MOTOROLA DSP56305 User s Manual 13 1 SECTION 13 VITERBI CO PROCESSOR ...
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Страница 522: ...13 52 DSP56305 User s Manual MOTOROLA VITERBI CO PROCESSOR References ...
Страница 523: ...CYCLIC CODE CO PROCESSOR MOTOROLA DSP56305 User s Manual 14 1 SECTION 14 CYCLIC CODE CO PROCESSOR ...
Страница 554: ...14 32 DSP56305 User s Manual MOTOROLA CYCLIC CODE CO PROCESSOR Configuration Examples ...
Страница 555: ...MOTOROLA DSP56305 User s Manual A 1 APPENDIX A BOOTSTRAP CODE ...
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