TRANSPORT FORMAT DETECTING APPARATUS AND METHOD

Abstract

To provide transport format detecting apparatus and method capable of reducing a period necessary for detecting a transport format and saving current consumption. A transport format detecting apparatus according to an embodiment of the invention includes: a Viterbi decoding unit calculating likelihood information of a plurality of paths up to each state of a trellis diagram based on a received sequence to generate a decoded sequence; a differential operational unit calculating a difference between the likelihood information in each state; a decoding control unit stopping generation of decoded sequence with the Viterbi decoding unit based on the difference between the likelihood information; and a transport format output unit detecting a transport format based on a size of the generated decoded sequence.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other objects, advantages and features of the present invention will be more apparent from the following description taken in conjunction with the accompanying drawings, in which:

FIG. 1 is a block diagram showing the configuration of a transport format detecting apparatus according to an embodiment of the present invention;

FIG. 2 is a flowchart of a transport format detecting method according to an embodiment of the present invention;

FIG. 3 is a trellis diagram illustrating a processing of the transport format detecting method according to an embodiment of the present invention;

FIG. 4 is a trellis diagram illustrating a processing of the transport format detecting method according to an embodiment of the present invention;

FIG. 5 is a trellis diagram illustrating a processing of the transport format detecting method according to an embodiment of the present invention;

FIG. 6 shows a simulation result of the transport format detecting method according to an embodiment of the present invention;

FIG. 7 shows a data format of an explicit detectable TrCH;

FIG. 8 is a diagram showing the configuration of a convolutional coder;

FIG. 9 is a trellis diagram showing state transition of the convolutional coder;

FIG. 10 shows an example of the coding bit of data encoded by the convolutional coder;

FIG. 11 is a trellis diagram showing an example of how the convolutional coder executes coding; and

FIG. 12 is a flowchart of a conventional transport format detecting method.

Claims

1. A transport format detecting apparatus, comprising: a decoding unit calculating likelihood information of a plurality of paths up to each state of a trellis diagram based on a received sequence to generate a decoded sequence;a differential operational unit calculating a difference between the likelihood information in each state;a decoding control unit stopping generation of decoded sequence with the decoding unit based on the difference between the likelihood information; anda detecting unit detecting a transport format based on a size of the generated decoded sequence.

2. The transport format detecting apparatus according to claim 1, wherein the decoding control unit stops generation of the decoded sequence based on a difference between likelihood information of all states at a predetermined time point.

3. The transport format detecting apparatus according to claim 1, wherein the decoding control unit stops generation of the decoded sequence if the difference between the likelihood information is smaller than a predetermined threshold value.

4. The transport format detecting apparatus according to claim 2, wherein the decoding control unit stops generation of the decoded sequence if the difference between the likelihood information is smaller than a predetermined threshold value.

5. The transport format detecting apparatus according to claim 1, wherein the difference between the likelihood information corresponds to a difference between pathmetrics of the plurality of paths up to each state.

6. The transport format detecting apparatus according to claim 2, wherein the difference between the likelihood information corresponds to a difference between pathmetrics of the plurality of paths up to each state.

7. The transport format detecting apparatus according to claim 3, wherein the difference between the likelihood information corresponds to a difference between pathmetrics of the plurality of paths up to each state.

8. The transport format detecting apparatus according to claim 4, wherein the difference between the likelihood information corresponds to a difference between pathmetrics of the plurality of paths up to each state.

9. The transport format detecting apparatus according to claim 1, wherein the decoding unit includes: an add-compare-select unit calculating likelihood information of the plurality of paths up to each state and selecting a survival path from among the plurality of paths; anda trace-back unit tracing back the selected survival path to generate decoded sequence, andthe decoding control unit calculates a difference between the likelihood information after calculating the likelihood information, and stops processings of the add-compare-select unit and the trace-back unit.

10. The transport format detecting apparatus according to claim 2, wherein the decoding unit includes: an add-compare-select unit calculating likelihood information of the plurality of paths up to each state and selecting a survival path from among the plurality of paths; anda trace-back unit tracing back the selected survival path to generate decoded sequence, andthe decoding control unit calculates a difference between the likelihood information after calculating the likelihood information, and stops processings of the add-compare-select unit and the trace-back unit.

11. The transport format detecting apparatus according to claim 3, wherein the decoding unit includes: an add-compare-select unit calculating likelihood information of the plurality of paths up to each state and selecting a survival path from among the plurality of paths; anda trace-back unit tracing back the selected survival path to generate decoded sequence, andthe decoding control unit calculates a difference between the likelihood information after calculating the likelihood information, and stops processings of the add-compare-select unit and the trace-back unit.

12. The transport format detecting apparatus according to claim 4, wherein the decoding unit includes: an add-compare-select unit calculating likelihood information of the plurality of paths up to each state and selecting a survival path from among the plurality of paths; anda trace-back unit tracing back the selected survival path to generate decoded sequence, andthe decoding control unit calculates a difference between the likelihood information after calculating the likelihood information, and stops processings of the add-compare-select unit and the trace-back unit.

13. The transport format detecting apparatus according to claim 1, wherein the decoding unit executes decoding up to a plurality of candidate sizes of a transport format, and the detecting unit outputs the candidate size less than a position where generation of the decoded sequence is stopped, as the transport format.

14. The transport format detecting apparatus according to claim 2, wherein the decoding unit executes decoding up to a plurality of candidate sizes of a transport format, and the detecting unit outputs the candidate size less than a position where generation of the decoded sequence is stopped, as the transport format.

15. The transport format detecting apparatus according to claim 3, wherein the decoding unit executes decoding up to a plurality of candidate sizes of a transport format, and the detecting unit outputs the candidate size less than a position where generation of the decoded sequence is stopped, as the transport format.

16. The transport format detecting apparatus according to claim 4, wherein the decoding unit executes decoding up to a plurality of candidate sizes of a transport format, and the detecting unit outputs the candidate size less than a position where generation of the decoded sequence is stopped, as the transport format.

17. The transport format detecting apparatus according to claim 1, wherein the detecting unit detects a transport format based on a result of executing cyclic redundancy check on the generated decoded sequence.

18. The transport format detecting apparatus according to claim 2, wherein the detecting unit detects a transport format based on a result of executing cyclic redundancy check on the generated decoded sequence.

19. The transport format detecting apparatus according to claim 3, wherein the detecting unit detects a transport format based on a result of executing cyclic redundancy check on the generated decoded sequence.

20. A transport format detecting method, comprising: calculating likelihood information of a plurality of paths up to each state of a trellis diagram based on a received sequence to generate a decoded sequence;calculating a difference between the likelihood information in each state;stopping generation of decoded sequence with the decoding unit based on the difference between the likelihood information; anddetecting a transport format based on a size of the generated decoded sequence.