Method and appratus for rate matching within a communication system
View Patent ↗A method and apparatus for rate matching is described. During operation of a transmitter, multiple data streams are received and individually interleaved with a permutation of a same length K Π . A permutation (π p0 ) of a second stream is the same as a permutation (π sys ) of a first stream and a permutation (π p1 ) of a third stream is different from the permutation of the first stream. Each element of π p1 is derived from the corresponding element of π sys . The plurality of interleaved streams are multiplexed to form a circular buffer. Finally, data is transmitted from the circular buffer.
1. A method for operating a transmitter, the method comprising the steps of:
receiving a first, second, and third data stream;
individually interleaving each data stream with a permutation of a same length K Π to produce first, second, and third interleaved streams, wherein a permutation (π p0 ) used to produce the second interleaved stream is the same as a permutation (π sys ) used to produce the first interleaved stream and a permutation (π p1 ) used to produce the third interleaved stream is different from π sys , and each element of π p1 is derived from the corresponding element of π sys ;
multiplexing the interleaved streams to form a circular buffer; and
transmitting bits from the circular buffer;
wherein the step of multiplexing the interleaved streams to form the circular buffer comprises the steps of:
interlacing the second interleaved stream and third interleaved stream to form an intermediate stream; and
concatenating the first interleaved stream with the intermediate stream.
2. The method of claim 1 wherein the data streams comprise symbol streams or bit streams.
3. The method of claim 1 wherein each element of the permutation π p1 is derived from a corresponding element of π sys via function π p1 (i)=ƒ(π sys (i),δ 1 ), 0≦i<K Π , where δ 1 is an integer.
4. The method of claim 3 wherein each element of π p1 is derived from a corresponding element of π sys via function π p1 (i)=(π sys (i)+δ 1 ) % K Π , 0≦i<K Π .
5. The method of claim 4 wherein δ 1 =1.
6. The method of claim 1 wherein the step of transmitting bits from the circular buffer comprises the steps of:
receiving a redundancy version (RV) and a number of desired bits; and
transmitting the number of desired bits from the circular buffer starting at the RV position.
7. The method of claim 6 wherein the redundancy version results in a portion of the first stream not being transmitted.
8. The method of claim 6 wherein the step of transmitting the number of desired bits from the circular buffer comprises the step of transmitting the number of desired bits from position R×(N col ×RV idx +σ) of the circular buffer, wherein RV idx is an integer denoting the redundancy version, and σ, R and N col are integers.
9. The method of claim 1 wherein the first data stream comprises a systematic stream, the second data stream comprises a first parity stream, and the third data stream comprises a second parity stream.
10. The method of claim 1 where the step of interleaving comprises the step of interleaving via a sub-block interleaver.
11. The method of claim 1 wherein the step of individually interleaving each data stream comprises the step of adding dummy bits to each data stream before individually interleaving so that each stream has length K Π .
12. The method of claim 11 wherein the step of transmitting bits from the circular buffer comprise the step of outputting consecutive bits from the circular buffer.
13. A method for operating a receiver, the method comprising the steps of:
receiving a signal comprising contents of a circular buffer over a channel;
de-multiplexing the signal to form a plurality of interleaved streams;
individually de-interleaving each stream according to a permutation to form a plurality of de-interleaved data streams, wherein a permutation (π p0 ) used to de-interleave a second stream is the same as a permutation (π sys ) used to de-interleave a first stream and a permutation (π p1 ) used to de-interleave a third stream is different from π sys , and each element of π p1 is derived from the corresponding element of π sys ; and
passing the plurality of de-interleaved data streams to a decoder;
wherein the step of de-multiplexing comprises the steps of:
de-concatenating an interleaved first stream with an intermediate stream; and
de-interlacing the intermediate stream to form an interleaved second stream and an interleaved third stream.
14. The method of claim 13 wherein each element of π p1 is derived from a corresponding element of π sys via function π p1 (i)=(π sys (i)+δ 1 ) % K Π , 0≦i<K Π , where δ 1 is an integer.
15. An apparatus comprising:
an encoder outputting a plurality of data streams;
interleaving circuitry individually interleaving each data stream to form a first, second, and third interleaved stream with each stream formed by using a permutation of a same length K Π , wherein a permutation (π p0 ) used to form the second interleaved stream is the same as a permutation (π sys ) used to form the first interleaved stream and a permutation (π p1 ) used to form the third interleaved stream is different from π sys , and each element of π p1 is derived from the corresponding element of π sys ;
bit-collection circuitry multiplexing the interleaved streams to form a circular buffer; and
transmission circuitry transmitting bits from the circular buffer;
wherein the bit-collection circuitry forms the circular buffer by:
interlacing the interleaved second stream and interleaved third stream to form an intermediate stream; and
concatenating the interleaved first stream with the intermediate stream.
16. The apparatus of claim 15 wherein the bit-collection circuitry forms the circular buffer by:
interlacing the interleaved second stream and interleaved third stream to form an intermediate stream; and
concatenating the interleaved first stream with the intermediate stream.
17. The apparatus of claim 15 wherein each element of π p1 is derived from a corresponding element of π sys via function π p1 (i)=(π sys (i)+δ 1 ) % K Π , 0≦i<K Π , where δ 1 is an integer.
18. An apparatus for operating a receiver, the apparatus comprising:
receiving circuitry receiving contents of a circular buffer over a channel;
a de-multiplexer de-multiplexing the signals to form a plurality of interleaved streams by de-concatenating an interleaved first stream with an intermediate stream and de-interlacing the intermediate stream to form an interleaved second stream and an interleaved third stream;
a de-interleaver individually de-interleaving each interleaved stream according a permutation to form a first, second, and third de-interleaved data stream, wherein a permutation (π p0 ) used to form the second de-interleaved data stream is the same as a permutation (π sys ) used to form the first de-interleaved data and a permutation (π p1 ) used to form the third de-interleaved data stream is different from π sys , and each element of π p1 is derived from the corresponding element of π sys ;
a decoder to decode de-interleaved data streams.