Apparatus and method for decoding
View Patent ↗Coding section 205 recodes decoded data stored in decoded data storage section 204 , data conversion section 206 converts data “0” and “1” output from coding section 205 to “1” and “−1” respectively, sum-of-product calculation section 207 multiplies the data output from data conversion section 206 by the demodulated data (soft decision value) stored in demodulated data storage section 201 and then calculates the sum of the products for 1 TTI and stores the sum-of-product result for each data rate, data rate decision section 208 decides the data rate corresponding to a maximum value of the sum-of-product results as the data rate of the demodulated data. This makes it possible to improve the accuracy of data rate decision and reduce decoding errors of a received signal.
1. A decoding apparatus using blind transport format detection, the decoding apparatus comprising:
a reference channel detection section that detects a channel that satisfies a predetermined first condition as a reference channel; and
a subordinate channel detection section that detects a subordinate channel which is subordinate to the reference channel based on a predetermined second condition, wherein:
said first condition comprises that convolutional coding is used on the reference channel, CRC bits exist in all transport blocks communicated on the reference channel, and the number of code blocks communicated on the reference channel is 1.
2. The decoding apparatus according to claim 1 , wherein the second condition comprises that a prospective subordinate channel and the reference channel employ the same data transmission length and the number of candidate data rates of the reference channel is equivalent to or greater than the number of candidate data rates of the prospective subordinate channel.
3. The decoding apparatus according to claim 1 , wherein the subordinate channel detection section narrows down the range of candidate reference channels to which subordinate channels may be subordinate, for each subordinate channel, based on a predetermined third condition and then detects subordinate channels which are subordinate to the reference channel based on the second condition.
4. The decoding apparatus according to claim 1 , wherein when a third condition exists that the data rate of the subordinate channel changes while the data rate of the reference channel does not change, the subordinate channel detection section regards the existence of the third condition as indicating that the subordinate channel should not be subordinate to the reference channel.
5. A decoding method comprising:
detecting a channel that satisfies a predetermined first condition as a reference channel; and
detecting a subordinate channel which is subordinate to the reference channel based on a predetermined second condition, wherein:
said first condition comprises that convolutional coding is used on the reference channel, CRC bits exist in all transport blocks communicated on the reference channel, and the number of code blocks communicated on the reference channel is 1.
6. A base station apparatus equipped with a decoding apparatus, said decoding apparatus comprising:
a reference channel detection section that detects a channel that satisfies a predetermined first condition as a reference channel; and
a subordinate channel detection section that detects a subordinate channel which is subordinate to the reference channel based on a predetermined second condition, wherein:
said first condition comprises that convolutional coding is used on the reference channel, CRC bits exist in all transport blocks communicated on the reference channel, and the number of code blocks communicated on the reference channel is 1.
7. A communication terminal apparatus equipped with a decoding apparatus, said decoding apparatus comprising:
a reference channel detection section that detects a channel that satisfies a predetermined first condition as a reference channel; and
a subordinate channel detection section that detects a subordinate channel which is subordinate to the reference channel based on a predetermined second condition, wherein;
said first condition comprises that convolutional coding is used on the reference channel, CRC bits exist in all transport blocks communicated on the reference channel, and the number of code blocks communicated oui the reference channel is 1.