A large-scale MIMO adaptive transmission method using low-precision ADC millimeter wave

Abstract

The invention discloses a millimeter large-scale MIMO self-adaptive transmission method adopting a low-precision ADC. The method comprises the following steps: performing channel estimation; performing data transmission; sending a signal to a base station by a user after simulating beamforming; quantizing a receiving signal by adopting a low-precision ADC through the base station, wherein the low-precision ADC is configured based on quantification bit number b, and determining the optimal b according to other parameters. By comprehensively considering the quantification error of the low-precision ADC, the simulated beamforming gain, the channel estimation error and the like, a precision configuration value is determined for a given data rate demand; the precision configuration value can minimize the overall power consumption of a base station signal analog-to-digital conversion module. The base station disclosed by the invention adopts the low-precision ADC, the user-side configures asingle radio frequency link for multiple antennas, the hardware and power consumption cost of the system are greatly reduced, and the method is suitable for any millimeter large-scale MIMO communication system under low signal-to-noise ratio environment.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and relates to a millimeter-wave large-scale MIMO (multiple-input multiple-output) adaptive transmission method using a low-precision ADC (analog-to-digital conversion unit). Background technique [0002] At present, in order to meet the rapidly growing demand for mobile data transmission, many countries around the world, including China, the United States, and South Korea, have begun to allocate millimeter wave frequency spectrum for the next generation of mobile communication systems. In the 30GHz to 300GHz millimeter wave frequency band, it is estimated that more than 150GHz authorized and unlicensed frequency bands can be used by wireless mobile communication networks. Compared with the existing low-frequency communication, the frequency of the millimeter-wave signal is dozens of times higher, and the path loss in free space alone is about 20dB higher. In a MIMO (Multiple Inpu...

AI Technical Summary

Problems solved by technology

Obviously, the phase spacing of the phase shifter and the channel noise will cause estimation error in two steps respectively

In addition, since low-precision ADCs are also used in channel estimation, there are still quantization errors in the estimated channel matrix

[0006] Obviously, in uplink data transmission, low-precision ADC, analog beamforming, channel estimation error, etc. will all have an impact on the data rate

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