Freescale Semiconductor MSC8156 Evaluation Module MSC8156EVM MSC8156EVM Benutzerhandbuch

Freescale Semiconductor

 

26-11

The MAPLE-B supports Turbo and Viterbi decoding for variable standards and configurations as 
described in Section 26.1, Features. Both the Turbo and Viterbi processing are done using the 
TVPE. Therefore, at given point in time the TVPE can either process Turbo decoding or Viterbi 
decoding. There is no parallel processing of Turbo and Viterbi. The MAPLE-B initialization 
sequence selects the desired Turbo standard operation mode (see Section 26.2, Modes of 
Operation).

The MAPLE-B supports Turbo decoding according to the following standards (MAPLE-B 
operation modes): 3GLTE, WiMAX, 3GPP and 3GPP2. Table 26-1 lists some of the parameters 
that the MAPLE-B uses for each of its operation modes.

Table 26-1.  MAPLE-B Assumptions for Each Supported Standard

3GLTE

1/3

Zero tail

Binary encoding

g

0

 = 1 + D

2

 + D

3 

(feedback)

g

1

 = 1 + D + D

3 

(parity)

WiMax

1/3

Tail biting

Duo-binary encoding

g

0

 = 1 + D +D

3 

(feedback)

g

1

 = 1 + D

2

 + D

3

 (Y parity)

g

2

 = 1 + D

3

 (W parity)

3GPP

1/3

Zero tail

Binary encoding

g

0

 = 1 + D

2

 + D

3 

(feedback)

g

1

 = 1 + D + D

3 

(parity)

3GPP2

1/5

Zero tail

Binary encoding

g

0

 = 1 + D

2

 + D

3

 (feedback)

g

1

 = 1 + D + D

3

 (Y

0

 parity)

g

2

 = 1 + D + D

2

 + D

3

 (Y

1

 parity)