A method to reduce phase error in high-order modulation with low-bit quantization

Abstract

The invention provides a method for reducing a phase error in high-order modulation of low-bit quantization, which is suitable for data transmission of an uplink channel between a terminal and a basestation and comprises the following steps: step 1, the terminal generating and sending a pilot frequency sequence to the base station, and dividing the pilot frequency sequence into two pilot frequency sub-sequences with the same length; step 2, the base station carrying out channel estimation according to each received pilot symbol, and generating a multi-antenna combination vector of a pilot sub-sequence according to a result of each channel estimation; and step 3, the base station carrying out multi-antenna combination on the received high-order modulation signal according to each multi-antenna combination vector, and obtaining the phase and amplitude of an intermediate result according to all multi-antenna combination results and a preset phase difference, thereby obtaining a detectionresult of the high-order modulation signal. Through the technical scheme of the invention, the phase error generated during high-order signal modulation in the low-bit quantization massive MIMO system is reduced, and the precision of actual channel estimation is improved.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a method for reducing phase errors in low-bit quantized high-order modulation. Background technique [0002] Massive multiple-input multiple-output (massive MIMO) systems have become a key technology required to improve the throughput of fifth-generation cellular systems (5G) systems. However, the potentially high power consumption of massive MIMO systems, especially the power consumption of radio frequency links, has become a bottleneck limiting its practical applications. [0003] In order to reduce the power consumption of the radio frequency link of the Massive MIMO system, using a digital-to-analog converter (Analog to Digital Converter, ADC) module with low bit quantization is a solution. However, low-bit quantization will cause the loss of signal amplitude and phase information, and the difference between the quantized signal and the pre-quantized signal is very la...

AI Technical Summary

Problems solved by technology

However, due to the limited time-frequency resources available in wireless communication, increasing the length of the pilot sequence will lead to excessive pilot overhead, and the time-frequency resources used to transmit useful data signals will be reduced, resulting in a decrease in effective throughput.

Images