A Method for Optimizing the Code Degree Distribution of Digital Fountains Based on Multiple Access Channels

Abstract

The invention provides a degree distribution optimization method of a digital fountain code based on a multiple access channel, belonging to the field of digital communication technology. An existing degree distribution optimization algorithm of the digital fountain code is only applicable to single-user channels, but the degree distribution optimized for the single-user channels cannot be well adapted to the multiple access channel. The invention provides the degree distribution optimization method of the digital fountain code based on the multiple access channel on the basis of a traditional linear programming method, and in addition, a degree distribution optimization model is proposed for two cases where the transmitting power of each user is equal and unequal in the multiple access channel, and the optimal bit error rate performance can be provided by using an optimization result.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, in particular to a code degree distribution optimization method of a digital fountain based on a multiple access channel. Background technique [0002] The traditional code division multiple access (CDMA) system mainly distinguishes different users through mutually orthogonal spreading sequences. Since the actually used spreading codes are difficult to achieve strict orthogonality and strict synchronization, resulting in multiple access interference (MAI ) has seriously affected the acceptance performance and system capacity. Moreover, the spreading code is specially designed, so it cannot meet the demand for explosive growth of the number of users. Recently, non-orthogonal multiple access technology has been extensively studied because of its support for a large number of users. Common non-orthogonal multiple access includes power multiple access, sparse code multiple access, fi...

AI Technical Summary

Problems solved by technology

[0006] The technical problem solved by the present invention is to aim at the deficiency of the above background technology, provide a digital fountain code degree distribution optimization method based on multiple access channels, and provide the equal power multiple access channels and unequal power multiple access channels respectively The degree distribution optimization model solves the problem of poor performance of existing degree distribution functions in multiple access channels

Images