A Simple Coding Method for Dirty Paper That Can Approach the Limit of Information Theory

Abstract

The invention proposes a simple dirty paper encoding method that can approach the limit of information theory. Based on the structural characteristics of q-ary linear modulation codes, that is, multiple codewords fall into the extended codebook of the codebook after being superimposed in the integer field, so that the dirty paper coding in n-dimensional space is simplified to the operation of symbol-by-symbol finite field subtraction , and maintain the optimal performance of dirty paper coding. The coding complexity of this method is basically the same as that of the single-user non-interference system, and dirty paper coding is realized with very low extra overhead. The decoding of this method only needs a symbol-by-symbol soft-value output detector and a single-user belief propagation decoding, and its complexity is basically the same as that of the single-user interference-free system. It has been verified by simulation that this method can approach the information theoretical limit of downlink multi-user channels (the gap is about 1dB), and significantly improve the system throughput and spectral energy efficiency at low cost.

Description

【Technical field】 [0001] Aiming at the problems of inter-user interference, spectrum efficiency and energy efficiency of multi-user downlink channel transmission in wireless communication, the present invention provides a new simple and efficient dirty paper coding method, which can approach the information theory limit of downlink multi-user channel at low cost, Substantially improve system throughput and spectral energy efficiency. The invention belongs to the field of communication and signal processing. 【Background technique】 [0002] Current and future wireless communications are based on multiple-access (MA) and multiple-input multiple-output (MIMO) systems. For the uplink, that is, multiple user equipments transmit information to a base station equipped with multiple antenna arrays, the scheme based on the serial interference cancellation (successive interference cancellation, SIC) can reach the theoretical capacity limit of uplink multi-user information. For the do...

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Problems solved by technology

[0003] However, prior to the present invention, progress in dirty paper coding was slow and very limited

Most of the work in the existing literature stays at the stage of theoretical analysis. Although it is proved that the dirty paper coding can achieve the same transmission rate as the non-interference channel, there are very few practical dirty paper coding methods.

Professor Z.Xiong from the United States and Professor S.Ten Brink from Germany have published a series of works on actual dirty paper coding. However, their methods are extremely complicated, involving multi-dimensional quantization, source coding, shaping and other elements. , and the gain of real dirty paper coding combined with channel coding is not clear, making it difficult to implement in practical wireless communication systems

At present, the theoretical performance of dirty paper coding is widely used to describe the upper limit of downlink spectral energy efficiency, but the degree of excavation of its huge performance improvement potential in practical applications is very limited

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