A transmission method for a multi-user large-scale MIMO-OFDM system using a low-precision analog-to-digital converter

Abstract

The invention discloses a multi-user large-scale MIMO-OFDM system transmission method using a low-precision ADC. The method includes: providing a closed expression of the uplink rate to obtain the most favorable multipath channel time delay power spectrum that should be satisfied Conditions; based on the rate expression, calculate the appropriate transmit power and the number of OFDM subcarriers according to the known system parameters and the required user rate; under the multipath channel, design a multi-user orthogonal pilot sequence based on OFDM; user transmit pilot For frequency signals, the base station performs low-precision quantization on the received signals and completes channel estimation; when the user transmits uplink data, the base station performs maximum-ratio combination on the quantized received signals according to the estimated channel. The invention can be used in a low-precision ADC multi-user large-scale MIMO-OFDM system, reduces the hardware cost and power consumption of the base station, and provides a transmission method that can effectively meet the transmission requirements of the user's uplink rate.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and relates to a multi-user large-scale multiple-input multiple-output-orthogonal frequency division multiplexing (MIMO-OFDM) system transmission method using a low-precision analog-to-digital converter (ADC). Background technique [0002] In order to adapt to the increase of mobile communication transmission rate requirements, massive MIMO technology has become one of the key technologies of contemporary wireless communication systems. A massive MIMO system configures a large number of antenna units on the base station side, making full use of space resources. At the same time, the radio frequency link corresponding to each antenna unit needs to be equipped with two ADCs. A large number of high-precision ADCs generate huge power consumption and greatly increase the construction cost of the base station. On the other hand, in order to pursue a larger communication bandwidth, the w...

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Problems solved by technology

[0004] At the same time, in the multi-user uplink transmission process, because the quantization distortion is related to the power of the ADC input signal, it is also affected by the multipath channel delay power spectrum

When the base station uses the traditional linear minimum mean square error (LMMSE) method for channel estimation, the estimation error performance of the multi-user orthogonal pilot is related to the quantization noise variance, which is also affected by the power distribution of the multipath channel

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