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Multi-level coding modulation method and device
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A technology for coding, modulating and modulating signals, applied in the field of communication, can solve problems such as reduced throughput, poor reliability of check bit sequence, and check bit sequence error, and achieves the effect of improving performance
Active Publication Date: 2017-05-31
ZTE CORP
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Problems solved by technology
The reliability of the check bit sequence generated by some encoding methods is worse than that of the coded information bit sequence, resulting in the coded information bit sequence decoded and output by the receiving end is correct, but the check bit sequence is wrong
If these coding methods are used as channel coding modules in multi-level coded modulation, the receiving end may not be able to correctly decode the uncoded information bits due to the error of the check bit sequence in the codeword bit sequence, resulting in an increase in the bit error rate of the system. High and reduced throughput, thereby reducing the performance of the entire high-order modulation communication system
[0010] It can be seen from this that in the existing multi-level coded modulation technology, the code word bit sequence and the uncoded information bit sequence are used for modulation mapping together, probably because the reliability of the parity bit sequence is worse than that of the coded information bit sequence, and the Ultimately, the uncoded information bit sequence cannot be correctly decoded, thereby reducing the performance of the entire high-order modulation communication system
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Embodiment 1
[0103] An example is given below to illustrate the implementation manner. The multi-level coding and modulation method in this embodiment includes the following steps:
[0104] Step 501 , it is assumed that the length of the input information bit sequence I0 is K0=16384 bits, the modulation mode currently transmitted is 256QAM, and the corresponding modulation order M=8. The information bit sequence I0 with a length of K0 bits is filled with all 0 bits in front of it to form an information bit sequence I with a length of K bits, so that K is an integer multiple of the determined modulation order M. Since mod(K0, M)=mod(16384, 8)=0, the length of the padded information bit sequence I is set to K=K0=16384 bits.
[0105] Step 502, dividing the padded information bit sequence I with a length of K=16384 bits into a first information bit sequence I1 with a length of K1 bits and a second information bit sequence I2 with a length of K2 bits, and K1=x*K / M, K2=y*K / M, M=x+y, wherein th...
Embodiment 2
[0113] Another example is given below to illustrate the implementation. The multi-level coding and modulation method in this embodiment includes the following steps:
[0114] Step 601 , it is assumed that the length of the input information bit sequence I0 is K0=14000 bits, the modulation mode currently transmitted is 512QAM, and the corresponding modulation order M=9. Filling the tail of the information bit sequence I0 with a length of K0 bits with all 0 bits to form an information bit sequence I with a length of K bits, where K is an integer multiple of the determined modulation order M. Because mod(K0, M)=mod(14000, 9)=5, the number of padding bits is M-mod(K0, M)=9-5=4, so the length K= K0+M-mod(K0,M)=14000+4=14004 bits.
[0115] Step 602, dividing the padded information bit sequence I with a length of K=14004 bits into a first information bit sequence I1 with a length of K1 bits and a second information bit sequence I2 with a length of K2 bits, and K1=x*K / M, K2=y*K / M, ...
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Abstract
The invention provides a method and a device for multi-level coding modulation. The method comprises the steps of: dividing received information bit sequences into a first information bit sequence and a second information bit sequence; generating a check bit sequence through channel coding of the first information bit sequence; generating a first modulation signal sequence S1 through modulation and mapping of the first information bit sequence and the second information bit sequence; generating a second modulation signal sequence S2 through separate modulation and mapping of the check bit sequence; and forming a third modulation signal sequence S by combination of the first modulation signal sequence S1 and the second modulation signal sequence S2, and then sending the third modulation signal sequence S. Therefore, failure in correct decoding of non-coded information bits (i.e. the second information bit sequence) caused by errors of the check bit sequence can be avoided, and the performance of an overall high-order modulation communication system can be improved effectively.
Description
technical field [0001] The present invention relates to the technical field of communications, and in particular, to a method and device for multi-level coding and modulation. Background technique [0002] At present, a digital communication system is a commonly used communication system. figure 1 is a structural block diagram of a digital communication system in the prior art, such as figure 1 As shown, a digital communication system consists of a transmitter, a channel and a receiver. The transmitter usually includes a signal source, a source encoder, a channel encoder, and a modulator, and the receiver usually includes a demodulator, channel decoding, etc. There is a channel (or storage medium) between the transmitter and the receiver, and there is a noise source in the channel. [0003] In a digital communication system, the channel coding link is the most critical technology of the entire digital communication physical layer, which determines the effectiveness and rel...
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