Encoding modulating method and demodulation modulating method
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A technology of coding modulation and coding bits, which is applied in the direction of digital transmission system, error prevention, multi-carrier system, etc., to achieve the effect of improving performance, reducing Shaping loss, and improving transmission capacity
Active Publication Date: 2012-01-11
TSINGHUA UNIV
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Constrained by the shape of the constellation diagram, the output of the constellation map is far from the ideal Gaussian distribution, so there is a gap between the information transmission rate and the channel capacity under the constraints of the constellation diagram
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Embodiment 1
[0070] The component code that transmitter adopts in the present embodiment is four-state RSC (2, [7, 5] 8 ), where RSC(v, [G r , G]) is a simple representation of the feedback system convolutional code, v represents the register level, G r Represents a feedback polynomial, G represents a feedforward polynomial, and the polynomials are expressed in octal numbers.
[0071] The code rates of the two feedback system convolutional codes adopted by the transmitter in this embodiment are both 1 / 2, so the information bits of N bits are turbo-encoded to obtain N-bit system bits, N-bit parity bits 1, and N-bit parity bits. Bit 2, a total of 3N bits of coded bits (not considering the tail bit) are output, where N is a positive integer.
[0072] The systematic bit, check bit 1 and check bit 2 are interleaved respectively to obtain the interleaved systematic bit, the interleaved check bit 1 and the interleaved check bit 2, which are collectively called the interleaved bit; the interleav...
Embodiment 2
[0079] The component code that transmitter adopts in the present embodiment is four-state RSC (2, [7, 5] 8 ).
[0080] The code rates of the two feedback system convolutional codes adopted by the transmitter in this embodiment are both 1 / 2, so the information bits of N bits are turbo-encoded to obtain N-bit system bits, N-bit parity bits 1, and N-bit parity bits. Bit 2, a total of 3N bits of coded bits (not considering the tail bit) are output, where N is a positive integer.
[0081] The systematic bit, check bit 1 and check bit 2 are interleaved respectively to obtain the interleaved systematic bit, the interleaved check bit 1 and the interleaved check bit 2, which are collectively called the interleaved bit; the interleaved check bit 1 and the interleaved check bit Check bits 2 are alternately arranged and added after the systematic bits to form interleaved bits with a length of 3N bits, and the first to L bits of the interleaved bits are intercepted as coded bits, and the ...
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Abstract
The invention discloses an encoding modulating method. In a modulating process, regular constellation mapping or irregular constellation mapping is carried out on bit data, so as to obtain a constellation mapping symbol, wherein the regular constellation mapping means that the mapping from a bit to a symbol is completed by adopting one constellation diagram and one constellation point mapping way, and the irregular constellation mapping means that the mapping from the bit to the symbol is completed by adopting one constellation diagram and more than one constellation point mapping ways. The invention further discloses a demodulation decoding method corresponding to the encoding demodulating method. In the invention, through using regular APSK (amplitude phase shift keying) constellation mapping at a sending end, the shaping loss can be obviously reduced, or by using irregular QAM (quadrature amplitude modulation) constellation mapping, the decoding and the de-mapping are matched more,so as to improve the transmission capability of an encoding modulating system, and through adopting iterative de-mapping at a receiving end, the loss brought by independent de-mapping can be effectively reduced, so as to obviously improve the performance of the encoding modulating system based on the iterative de-mapping.
Description
technical field [0001] The invention relates to the field of digital information transmission, in particular to an encoding and modulation method and a demodulation and decoding method. Background technique [0002] In the future digital information transmission system, it is not only necessary to be able to transmit existing network data, but also to be able to adapt to the transmission of more and more multimedia data, so the requirements for transmission rate are constantly increasing. Since the available bandwidth is limited, the possibility of increasing the transfer rate by extending the bandwidth is limited. In this way, how to rationally design coding, decoding and modulation and demodulation technologies to achieve high transmission rate requirements in bandwidth-limited channels has become an important topic for future research in the field of digital information transmission. [0003] In the field of wireless digital information transmission, in order to meet the...
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