CN101471753B - Communication system and method for processing signals therein - Google Patents

Communication system and method for processing signals therein Download PDF

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Publication number
CN101471753B
CN101471753B CN2009100018875A CN200910001887A CN101471753B CN 101471753 B CN101471753 B CN 101471753B CN 2009100018875 A CN2009100018875 A CN 2009100018875A CN 200910001887 A CN200910001887 A CN 200910001887A CN 101471753 B CN101471753 B CN 101471753B
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bits
coded
sequence
coding
hole pattern
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CN101471753A (en
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李永朝
金沂浚
庆赞浩
尹宁佑
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LG Electronics Inc
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LG Electronics Inc
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0071—Use of interleaving
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Quality & Reliability (AREA)
  • Error Detection And Correction (AREA)
  • Radio Transmission System (AREA)

Abstract

The invention provides a communication system and a method for transmitting signals therein, a pair of turbo codes having the same performance are generated from an information bit sequence by varying an output order of a turbo code generator. A preferred punching mode is utilized to punch a coding bit sequence, the resultant sequence has the same error correction performance and can be used when a transmit diversity method or a H-ARQ method is employed, in order to enhance the performance of the system. When the transmit diversity is utilized to transmit differently-coded bit sequences, a receiver can obtain coding combination gains and maximum ratio combination gains by means of combining the differently-coded bit sequences.

Description

Communication system and the method for transmitted signal therein
The application be submit to June 18 calendar year 2001, application number is 01118822.7, denomination of invention is divided an application for the patent application of " communication system and therein the method for transmitted signal ".
Technical field
The present invention relates to 3-G (Generation Three mobile communication system).More particularly, the present invention relates to a kind of communication system and method for the turbo Code And Decode for data.
Background technology
Say that briefly the next generation supports the high speed data transfer of Mbps based on the mobile communication system of code division multiple access (CDMA) pattern, and needs 10 unlike voice communication system -5～10 -6Very low packet error rate.But, when the convolutional encoding model application that generally uses arrives high speed data transfer, exist various restrictions in the existing communication system.In this respect, use widely a kind of turbo coding mode, even in order under the unwanted movement communication environment, also can keep low packet error rate.Nearest trend is to adopt widely the turbo coding mode as the standard of mobile communication system.
Fig. 1 shows a turbo encoder that is connected in parallel that produces the correlation technique of turbo code.With reference to figure 1, the turbo encoder that is connected in parallel is the composition encoder 10 and 11 by two connections parallel with one another, and interleaved units 12 that is inserted between them consists of.Produce an information bit X from the first composition encoder 10 KThe first parity check bit Y 0KAnd Y 1K, and produce a staggered information bit X from the second composition encoder 11 K' the second parity check bit Y 0K' and Y 1K'.
Correlation technique is connected in parallel the turbo encoder with X KY 0KY 1KX K' Y 0K' Y 1K' Sequential output information bit and parity check bit, therefore, the encoding rate of turbo encoder is 1/6.
Fig. 2 shows the device that produces signal transmission according to the turbo encoder of correlation technique.With reference to figure 2, provide a basic turbo encoder 201 with the turbo encoder that is connected in parallel of Fig. 1.It is 1/6 coding sequence that basic turbo encoder 201 is encoded into an encoding rate with signal bit sequence.A perforation (puncturing) unit 202 is at the enterprising eleven punch 11 of coding sequence, thus make the encoding rate that obtains can with the encoding rate coupling that requires.Perforation is to carry out according to the predetermined perforations pattern that provides optimum performance.The 204 pairs of twelve punch y sequences in a rate-matched unit are carried out code element repetition or perforation, so that the length N of coding sequence and interleaved units 205 coupling.The carry-out bit sequence of interleaved units 205 interleave rate-matched unit 204 is to overcome the burst error characteristic of channel.Modulator and expanding element 206 modulation and expansion interleaved bit sequence.
At this moment, " the X that has the hole pattern perforation of being determined by the encoding rate that requires from the coding sequence of basic turbo encoder 201 KY 0KY 1KX K' Y 0K' Y 1K' " such output order.As a result, the signal that sends according to signal bit sequence from transmitter has a kind of output order.
But, such situation is arranged, that is, and need to be that produce from the identical information bit sequence and the bit sequence of different coding that have identical error correcting capability.For example, if the transmit diversity of two antennas is applied to correlation technique, so owing to obtaining extra code combination gain and max ratio combined gain at receiver, so each antenna transmission unlike signal is better than emission same signal.In correlation technique, because basic turbo encoder 201 has " X KY 0KY 1KX K' Y 0K' Y 1K' " such output order, the punch unit 202 in the transmitter is not to have a kind of hole pattern, but several hole pattern, to obtain the bit sequence of different coding.In addition, the twelve punch y sequence must have identical error correcting capability.Be difficult to find the hole pattern with identical performance, and, even found the hole pattern with identical performance, because the change of the hole pattern of using in the punch unit 202 may cause the hole pattern of rate-matched unit 204 to change, so that transmitter becomes is more complicated.Transmitter need to be remembered the combination of the hole pattern of using in punch unit 202 and rate-matched unit 204.
Fig. 3 shows the correlation technique device that is used for decoding receive signal when transmit diversity is used same signal.
Receive from two modulation signals of transmitter emission with reference to 3, two receiver antennas of figure.Then, demodulator 301 and go expanding element 302 to be in harmonious proportion to the signal solution and go expansion.Combiner 303 will be from demodulator 301 and the mutual soft combination of signal of going expanding element 302 to export, to obtain having the bit sequence of low error rate.Go matching unit 304 to go coupling to bit sequence deinterleave and the speed of combination by a speed, and go punch unit 305 to go perforation by one.The resulting bit sequence of decoder 306 decodings is to obtain the signal bit sequence X of unit 305 initial transmissions K
The below shows detailed example, with more definitely explanation design.
Suppose two antenna transmit diversities, and the encoding rate of the hope after the hypothesis punch unit 202 is 1/2.
For the encoding rate that obtains from 1/6 original coding rate to wish, code element perforation piece is bored a hole to bit sequence according to the hole pattern (not shown).In the situation through two antenna transmission same signals, bore a hole to the coding sequence from turbo encoder 201 according to hole pattern, and the order of the sequence that produces is " X kY 0kX K+1Y 0k+1' ".Rate-matched, staggered, modulate this perforation sequence, and launch by noisy communication channel through two transmitting antennas.
Two signals pass different channel circumstances, and receive independently at receiver antenna.Combiner 303 with the identical order of their emissions, that is, and " X kY 0kX K+1Y 0k+1' ", combination is from the power of the demodulation bit sequence of two antennas.
That is to say that combiner 303 is carried out the max ratio combined to the demodulation bit sequence, and compare with the encoding rate that transmits that the efficient coding rate does not change.
In the situation through two antenna transmission unlike signals, with the coding sequence of the different hole pattern perforation that provide identical performance from turbo encoder 201.Suppose to find that hole pattern " 110000100010 " has identical performance with " 100010110000 ", can produce two unlike signals from them so.That is, use different hole patterns to the coding sequence perforation from turbo encoder 201.The order of the sequence that produces is " X kY 0kX K+1Y 0k+1' " and " X kY 0k' X K+1Y 0k+1".Rate-matched, staggered, modulate these sequences, and launch by noisy communication channel through two transmitting antennas.Receive independently at receiver, demodulation, remove expansion, deinterleave, two signals that go to bore a hole, and make up at combiner.In this case, combiner should have enough intelligence, thereby makes it carry out max ratio combined to system bits, simultaneously parity check bit is carried out code combination, that is, the order of combination bit sequence is " X kY 0kY 0k' X K+1Y 0k+1' Y 0k+1".That is to say that combiner to received signal run time version makes up and max ratio combined, and the efficient coding rate is reduced to 1/3, this has improved error correcting capability.
In the situation of using mixed type automatic repeat request (being called " H-ARQ ") pattern, can show another example.
Fig. 4 is the flow chart of process of the Mode of Hybrid ARQ pattern of explanation correlation technique.
With reference to figure 4, in the Mode of Hybrid ARQ pattern of correlation technique, transmitter is added to signal bit sequence with a cyclic redundancy check (CRC) (CRC) code, and will increase the signal bit sequence coding of CRC, to produce coding sequence.Then, with coding sequence perforation, rate-matched, interlock, be modulated into one and transmit, and send to receiver.Receiver receives this signal (S20), and this signal of demodulation code.Whether receiver exists the bit sequence identical with the demodulation bit sequence of receiver by checking in a buffer, determine the demodulation bit sequence be " new signal " or " heavy transmitted signal " (S21).
If there is not identical bit sequence in the buffer, so the bit sequence that receives directly is stored in (S22) in the buffer.If there is identical bit sequence in the buffer, the bit sequence that receives and the combination of the bit sequence in the buffer, then be stored in (S23) in the buffer so.
By the bit sequence stored in the crc check buffer to determine whether in the bit sequence that receives, having any mistake (S24).If be free from mistakes in the bit sequence that receives, receiver sends an affirmation (ACK) signal to transmitter so, and empties buffer (S26).
If in the bit sequence that receives, have any mistake, so the bit sequence that receives is stored in the buffer, and receiver sends negative (NACK) signal (S25) to transmitter.
Therefore, if transmitter receives ack signal, transmitter sends next new information data so.If transmitter receives the NACK signal, transmitter resends the information data that sent in the past so.
The signal that the receiver demodulation resends, and the bit sequence combination of storing in it and the buffer, thereby with the bit sequence decoding that receives.If there is not mistake in the combination bit sequence, receiver sends ack signal to transmitter so.If there is any mistake in the combination bit sequence, receiver sends the NACK signal to transmitter so, and another time of request identical data resends, and at this moment the combination bit sequence is stored in the buffer.
At this moment, if the bit sequence that resends comprises the parity check bit identical with the bit sequence of former transmission, the portfolio premium that can obtain at receiver so is the max ratio combined gain in AWGN (Additive White Gaussian Noise) channel.In order to obtain code combination gain and max ratio combined gain, " bit sequence that resends " must comprise the parity check bit different from " new bit sequence ", and the punch unit of transmitter must have several modes, comprises the sequence of different parity check bits with generation.
When using coded sequence in transmit diversity systems, acquisition is useful based on the sequence of the different coding of an information source.But the method that obtains the sequence of different coding by the hole pattern that changes transmitter may increase complexity, is not a hole pattern because transmitter and receiver all should use, but several hole pattern.In addition, be difficult to find the hole pattern with identical performance.
Summary of the invention
In order to address the above problem, an object of the present invention is the method that a kind of communication system will be provided and in this communication system, transmit, wherein need not to increase complexity and just can produce the turbo code with identical performance.
Another object of the present invention is will produce the sequence of different coding and need not change hole pattern.
More particularly, an object of the present invention is sequentially to produce by the output that suitably changes the turbo encoder sequence of the different coding with identical error-correcting performance.
For realizing purpose of the present invention, the invention provides a kind of method for the coding input position, comprising: provide the input position to the first and second encoders that are positioned on the different paths, wherein said the first and second encoders are basic turbo encoder; So that the first bits of coded to be provided, wherein this first bits of coded comprises X Y by each input position of the first encoder encodes 0Y 1X ' Y 0' Y 1' or X ' Y 0' Y 1' X Y 0Y 1Or X Y 0' Y 1' X ' Y 0Y 1So that the second bits of coded to be provided, wherein this second bits of coded comprises X Y by each input position of the second encoder encodes 0Y 1X ' Y 0' Y 1' or X ' Y 0' Y 1' X Y 0Y 1Or X Y 0' Y 1' X ' Y 0Y 1, wherein this first bits of coded and this second bits of coded differ from one another; And the first and second bits of coded are provided and bore a hole to form the output encoder position with identical hole pattern, wherein X and X ' they are information bit, and Y 0, Y 1, Y 0' and Y 1' be parity check bit.
For realizing purpose of the present invention, the invention provides a kind of method that in communication equipment, transmits, comprise: the sequence of encoded information bits, each information bit of wherein encoding is with the coding output of bits of coded that defined amount is provided, so that the coding of the sequence of information bit produces a plurality of coding outputs, and the order of the bits of coded of each coding output is variable; Utilize bore a hole each of a plurality of codings output of a kind of hole pattern; The sequence that is provided for launching with at least one transmitting antenna of process that is provided for launching through at least one transmitting antenna, this sequence is by utilizing identical hole pattern this coding sequence of boring a hole at punch unit, yet carries out after rate-matched, staggered, the modulation resulting to the perforation output of this punch unit.
For realizing purpose of the present invention, the invention provides a kind of communication system of using emission diversity method, comprising: transmitter is used for through the signal of at least one pair of transmission antennas transmit based on the different coding position; And receiver, be used for through at least one pair of receiver antenna reception, this signal that makes up and decode, wherein; This transmitter comprises: the turbo encoder, be used for based on a plurality of coding outputs of the sequence generation of information bit, each information bit of wherein encoding is with the coding output of bits of coded that defined amount is provided, so that the coding of the sequence of information bit produces a plurality of coding outputs, and the order of the bits of coded of each coding output is variable; And punch unit, be used for utilizing each output of a plurality of codings outputs of boring a hole of a kind of hole pattern.
For realizing purpose of the present invention, the invention provides a kind of transmitter for transmitting in communication system, comprise: the turbo encoder, be used for from a plurality of coding outputs of the sequence generation of an information bit, each information bit of wherein encoding is with the coding output of bits of coded that defined amount is provided, so that the coding of the sequence of information bit produces a plurality of coding outputs, and the order of the bits of coded of each coding output is variable; And punch unit, be used for boring a hole to each output of a plurality of coding outputs respectively with identical hole pattern.
For realizing purpose of the present invention, the invention provides a kind ofly for receiving the receiver of signal in communication system through at least one transmitting antenna, comprising: a plurality of demodulators and remove expanding element are used for separating respectively to be in harmonious proportion removing spread signal; A plurality of deinterleaves and speed are removed matching unit, the output that is used for deinterleave and goes to mate a plurality of demodulators and remove expanding element; A plurality of punch units that go are used for utilizing the identical hole pattern of going to go the signal of matching unit output to go perforation to a plurality of deinterleaves and speed respectively; And combiner, be used for making a plurality of mutual soft combinations of output of removing punch unit.
For realizing purpose of the present invention, the invention provides when support code combination switch mode, a kind of method that transmits in communication system comprises the following steps: to produce a turbo coding sequence and it is transmitted into a receiver from signal bit sequence; By control signal, produce the 2nd turbo coding sequence of the arrangement that is different from a described turbo coding sequence and it is transmitted into described receiver from signal bit sequence, wherein, if a turbo coding sequence is X k, Y 0k, Y 1k, X k', Y 0k', Y 1k', then the 2nd turbo coding sequence is X k, Y 0k', Y 1k', X k', Y 0k, Y 1k
By explaining with reference to the accompanying drawings embodiment, can clearer understanding be arranged to other objects, features and advantages of the present invention.
Description of drawings
By explaining with reference to the accompanying drawings embodiment, further deepen the understanding to other objects, features and advantages of the present invention now, wherein:
Fig. 1 shows one for generation of the turbo encoder that is connected in parallel of the correlation technique of turbo code;
Fig. 2 shows one and is used for producing the device that transmits according to correlation technique turbo encoder;
Fig. 3 shows a correlation technique device that is used for decoding received signal when same signal is used for transmit diversity;
Fig. 4 is the flow chart of the process of explanation correlation technique Mode of Hybrid ARQ pattern;
Fig. 5 shows the device that transmits that produces based on turbo encoder according to the present invention;
Fig. 6 shows another device that transmits that produces based on turbo encoder according to the present invention; With
Fig. 7 shows the device for decoding received signal when unlike signal is used for transmit diversity.
Embodiment
Below be with reference to the accompanying drawings to a preferred embodiment according to communication system of the present invention, and the detailed description of the method for processing signals in communication system.
The order of supposing the coding sequence of correlation technique turbo encoder is X kY 0kY 1kX k' Y 0k' Y 1k', in the present invention, the order of the coding sequence of turbo encoder can be X k' Y 0k' Y 1k' X kY 0kY 1k, or X kY 0k' Y 1k' X k' Y 0kY 1k, and X kY 0kY 1kX k' Y 0k' Y 1k'.
The turbo encoder that is connected in parallel with reference to 1, one turbo code of figure comprises two composition encoders, and one is inserted in their middle interleaved units.
Two composition encoders all are the recursive system convolution coders, and have identical performance.The first composition encoder is with input value X kWithout change output, and export simultaneously two parity check bit Y 0kAnd Y 1k, the second composition encoder output X kThe staggered version X of itself k', export simultaneously two parity check bit Y 0k' and Y 1k'.Therefore, the basic turbo encoder output among Fig. 1 has the bit sequence of 1/6 encoding rate.
For the encoding rate that obtains from 1/6 original coding rate to wish, code element perforation piece is according to regular twelve punch y sequence shown in the table 1.The encoding rate of wishing can be 1/2,1/3,1/4, or 1/5.
Table 1
Figure GSB00000884514100091
Attention: for every kind of encoding rate, should at first from top to bottom, so from left to right read perforated table.
In table 1, the position that " 0 " expression should be bored a hole, the position that " 1 " expression should not be bored a hole.
At this moment, in the present invention, if need to be with signal bit sequence with different output sequential encodings, can use a switch, this switch can be parts of turbo encoder, and the output of definite coding sequence order, so that have as shown in Figure 5 different carry-out bit order from the bit sequence of each composition encoder output of basic turbo encoder 401, thereby with a kind of Sequential output bit sequence of hope.Perhaps turbo encoder itself should have the ability of the coding sequence of that a kind of order is not only in output but several orders.
Fig. 5 shows the device that transmits that produces based on turbo encoder according to the present invention.
With reference to figure 5, comprise 401, one switches 402 of a basic turbo encoder for generation of the device that transmits based on turbo encoder according to the present invention, a punch unit 403,405, one interleaved units 406 in a rate-matched unit, and modulator and expanding element 407.Switch 402 determines the output order from the coding sequence of turbo encoder 404.If basic turbo encoder 401 itself can be not only with a kind of fixedly output order but with several output Sequential output coding sequences, can cancel switch 402 so.At this moment, turbo encoder 404 is defined as a kind ofly can be not only exports order but with the turbo encoder of several output Sequential output coding sequences with a kind of.
Suppose from the output of basic turbo encoder 401 it sequentially is the X of the mode identical with correlation technique kY 0kY 1kX k' Y 0k' Y 1k', the output order from the coding sequence of turbo encoder 404 can be X in the present invention k' Y 0k' Y 1k' X kY 0kY 1k, or X kY 0k' Y 1k' X k' Y 0kY 1k
Punch unit 403 is according to the hole pattern shown in the table 1, to above-mentioned coding sequence perforation, with the encoding rate that obtains to wish.After this, rate-matched, interlock, expand and modulate this twelve punch y sequence.At this moment, punch unit 403 need to be stored a kind of hole pattern according to the encoding rate of hope.
Fig. 6 shows for producing according to another device that transmits of the present invention when the bit sequence of different coding is used for transmit diversity.
As shown in Figure 6, for base station A or antenna A, the device of path 1 process of processing channel position comprises basic turbo encoder 1501, switch 1502, punch unit 1503, rate-matched unit 1505, interleaved units 1506 and modulator and expanding element 1507.And for base station B or antenna B, path 2 comprises basic turbo encoder 2509, switch 2510, punch unit 2511, rate-matched unit 2513, interleaved units 2514 and modulator and expanding element 2515.
Coding sequence from turbo encoder 504,512 differs from one another, and bores a hole at punch unit 503,511 with identical hole pattern.Rate-matched, interlock, modulate resulting sequence, and through the different antennae emission.In the system of routine, punch unit 503 should have different hole patterns with 511, and to obtain the having sequence of different parity check bits, this has increased the complexity of system.
Fig. 7 shows the device of decoding received signal when transmit diversity is used unlike signal.
As shown in Figure 7, to two decodings that transmit.
As shown in Figure 7, the device of path 1 process of processing channel position comprise demodulator and go expanding element 1601, speed to remove matching unit 602, remove punch unit 1603, combiner 604 and decoder 605, wherein demodulator and go expanding element 1601, speed to remove matching unit 602, remove punch unit 1603 component units 610.And path 2 comprises demodulator and go expanding element 2606, speed to remove matching unit 607, remove punch unit 2 608, switch 609, wherein demodulator and go expanding element 2 606, speed to remove matching unit 607, remove punch unit 2608 component units 611.
In independently reception, demodulation of receiver, go to expand, deinterleave, two the different signals that go to bore a hole, and combination in combiner 604.In this case, combiner should have enough intelligence, so that it can carry out max ratio combined to system bits, simultaneously parity check bit is carried out code combination.As the situation of transmitter, in the present invention, go punch unit 603 and 608 to use a hole pattern.But, in conventional system because transmitter uses different hole patterns to produce different signals, shown in go punch unit 603 should use different hole patterns with 608.
Show below a detailed example, so that design of the present invention more properly to be described.
Suppose the transmit diversity of two antennas, and the encoding rate of the hope after the hypothesis punch unit 503,511 is 1/2.
From table 1, can be that 1/2 hole pattern is pronounced " 110000100010 " with encoding rate, and in punch unit 503 and 511, all use this pattern.If the order from the coding sequence of turbo encoder 504 is " X kY 0kY 1kX k' Y 0k' Y 1k' ", the coding sequence from turbo encoder 512 should be different order so, for example, and " X kY 0k' Y 1k' X k' Y 0kY 1k".Then, punch unit 503 and 511 utilizes identical pattern to bore a hole to coded sequence, and the sequence that obtains becomes " X kY 0kX K+1Y 0k+1' ", and " X kY 0k' X K+1Y 0k+1".Rate-matched, interlock, modulate this sequence, and through the different antennae emission.
In independently reception, demodulation of receiver, remove expansion, deinterleave, two signals that go to bore a hole, and in combiner 604 combination.Different from conventional system, the punch unit that goes of each signal uses the identical hole pattern of going.Combiner carries out max ratio combined to system bits, simultaneously parity check bit is carried out code combination, that is, the order of composite sequence is " X kY 0kY 0k' X K+1Y 0k+1' Y 0k+1".That is to say that combiner makes up and max ratio combined for receiving the signal run time version, and the efficient coding rate is reduced to 1/3, this has improved error correcting capability.
In the situation of having used mixed type automatic repeat request (being called " H-ARQ ") pattern, can show another example.
" newly " signal is used different signals with " re-emissioning " signal, can obtain extra code combination gain.Owing to " newly " and " re-emissioning " signal has been used a kind of hole pattern, so do not increase the complexity of system.
For the situation of using hybrid ARQ is described, below show detailed example.The encoding rate of supposing the hope after punch unit 403 is 1/2.
Transmitter produces the signal shown in Fig. 5.
Transmitter is with " X kY 0kY 1kX k' Y 0k' Y 1k' " sequential encoding " newly " bit sequence, and bore a hole it according to hole pattern " 110000100010 ".The bit sequence that obtains is " X kY 0kX K+1Y 0k+1' ", and rate-matched, interlock, modulate this sequence, and be transmitted into receiver.
If receiver sends " NACK " to " newly " signal, transmitter is with " X so kY 0k' Y 1k' X k' Y 0kY 1k" the sequential encoding bit sequence of " re-emissioning ", and bore a hole it according to identical pattern.The bit sequence that obtains is " X kY 0k' X K+1Y 0k+1", and rate-matched, interlock, modulate this sequence, and be transmitted into receiver.
Receiver is " re-emissioning " signal and " newly " signal combination that is stored in the buffer.Because two signals differ from one another, so can obtain code combination gain and max ratio combined gain.
As mentioned above, have the following advantages according to communication system of the present invention and the method that in communication system, transmits.
By changing simply the output order of turbo encoder, can utilize identical hole pattern, obtain providing the sequence of the different coding of identical performance from an information sequence.
That is to say that the present invention can easily produce different signals, and need not to increase the complexity of transmitter and receiver.When using transmit diversity, for example, when two antenna diversities or H-ARQ, can use different signals to improve the performance of system.
Top explanation will make those skilled in the art under the spirit that does not depart from technological concept of the present invention, improve and to revise the present invention.But technical scope of the present invention is not limited to the explanation of above-described embodiment, but should be determined by claim.

Claims (6)

1. method that is used for the coding input position comprises:
Provide the input position to the first and second encoders that are positioned on the different paths, wherein said the first and second encoders are basic turbo encoder;
So that the first bits of coded to be provided, wherein this first bits of coded comprises X Y by each input position of the first encoder encodes 0Y 1X ' Y 0' Y 1' or X ' Y 0' Y 1' X Y 0Y 1Or X Y 0' Y 1' X ' Y 0Y 1
So that the second bits of coded to be provided, wherein this second bits of coded comprises X Y by each input position of the second encoder encodes 0Y 1X ' Y 0' Y 1' or X ' Y 0' Y 1' X Y 0Y 1Or X Y 0' Y 1' X ' Y 0Y 1, wherein this first bits of coded and this second bits of coded differ from one another; And
The first and second bits of coded are provided and bore a hole to form the output encoder position with identical hole pattern,
X information bit wherein, and X ' is staggered information bit, and Y 0, Y 1Be the parity check bit of X, and Y 0' and Y 1' be the parity check bit of X '.
2. the method for claim 1, wherein for 1/2 encoding rate, identical hole pattern comprises:
X 11 Y 0 10 Y 1 00 X′ 00 Y 0′ 01 Y 1′ 00
Wherein, the bits of coded of the correspondence of " 0 " expression the first and second bits of coded will be perforated, and the bits of coded of the correspondence of " 1 " expression the first and second bits of coded will not be perforated, and first from top to bottom, then use described hole pattern from left to right.
3. the method for claim 1, wherein for 1/3 encoding rate, identical hole pattern comprises:
X 11 Y 0 11 Y 1 00 X′ 00 Y 0′ 11 Y 1′ 00
Wherein, the bits of coded of the correspondence of " 0 " expression the first and second bits of coded will be perforated, and the bits of coded of the correspondence of " 1 " expression the first and second bits of coded will not be perforated, and first from top to bottom, then use described hole pattern from left to right.
4. the method for claim 1, wherein for 1/4 encoding rate, identical hole pattern comprises:
X 11 Y 0 11 Y 1 10 X′ 00 Y 0′ 01 Y 1′ 11
Wherein, the bits of coded of the correspondence of " 0 " expression the first and second bits of coded will be perforated, and the bits of coded of the correspondence of " 1 " expression the first and second bits of coded will not be perforated, and first from top to bottom, then use described hole pattern from left to right.
5. the method for claim 1, wherein for 1/5 encoding rate, identical hole pattern comprises:
X 11 Y 0 11 Y 1 11 X′ 00 Y 0′ 11 Y 1′ 11
Wherein, the bits of coded of the correspondence of " 0 " expression the first and second bits of coded will be perforated, and the bits of coded of the correspondence of " 1 " expression the first and second bits of coded will not be perforated, and first from top to bottom, then use described hole pattern from left to right.
6. the method for claim 1 is wherein selected XY with switch 0Y 1X ' Y 0' Y 1', X ' Y 0' Y 1' XY 0Y 1With X Y 0' Y 1' X ' Y 0Y 1In one.
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