Bit interleaved polar code modulation method and apparatus

Abstract

Embodiments of the present invention disclose a bit interleaved polar code modulation method and apparatus. The method comprises the steps of calculating, according to a maximum mutual information condition, a continuous probability distribution value P(xi) of each constellation point in an M-dimensional constellation map corresponding to a target bit sequence; creating a Huffman tree with all constellation points in the M-dimensional constellation map as leaf nodes; discretizing the P(xi) according to closest (2-k), so as to obtain a discretization probability distribution set of the constellation points; and combining the obtained discretization probability distribution set of the constellation points with Gray mapping, and taking the value as shown in the specification so as to obtain an unequal probability constellation map of the constellation points. According to the method, when the channel capacities are equal, the signal to noise ratio required by the unequal probability distribution constellation map is lower than the signal to noise ratio required by the equal probability constellation map, and the system performance is improved.

Description

technical field [0001] The invention relates to the field of digital communication systems, in particular to a bit interleaved polar coding modulation method and device. Background technique [0002] E. Arikan proposed polar codes (PolarCodes), a new constructable channel coding method in 2009. He theoretically proved that polar codes can achieve the channel capacity of discrete symmetric channels through the encoding and decoding complexity of O(NlogN) , where N=2 n is the channel coding code length, and n is a natural number. The basic polarization unit of the polar code is as figure 1 As shown, the most basic operation is for two independent and identically distributed channels Perform merge and split operations, where For binary input channels, The value is {0,1}, Output a set of symbols for a channel. Such as figure 1 As shown, u 1 , u 2 It is the input of the polarization unit, both of which are binary bits. Add the two input signals modulo two to get x ...

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Problems solved by technology

In other words, the current polar coding modulation scheme does not achieve the optimal constellation probability distribution, so the polar coding modulation scheme in the prior art needs to be optimized

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