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Multi-user large-scale multiple-input-multiple-output-orthogonal frequency division multiplexing system transmission method adopting low-precision analog-to-digital converter

An analog-to-digital converter and orthogonal frequency division technology, which is applied in the field of multi-user large-scale MIMO-OFDM system transmission, can solve the problems of multi-path channel power distribution and impact, and achieve low Power consumption, the effect of eliminating the influence of uplink channel estimation

Active Publication Date: 2020-06-19
SOUTHEAST UNIV
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  • Application Information

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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

Method used

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  • Multi-user large-scale multiple-input-multiple-output-orthogonal frequency division multiplexing system transmission method adopting low-precision analog-to-digital converter
  • Multi-user large-scale multiple-input-multiple-output-orthogonal frequency division multiplexing system transmission method adopting low-precision analog-to-digital converter
  • Multi-user large-scale multiple-input-multiple-output-orthogonal frequency division multiplexing system transmission method adopting low-precision analog-to-digital converter

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Embodiment 1

[0044] Embodiment 1: A multi-user large-scale multi-input multi-output-orthogonal frequency division multiplexing (MIMO-OFDM) system transmission method using a low-precision analog-to-digital converter (ADC). In this scheme, figure 1 In the uplink of the massive MIMO-OFDM system shown, N t One single antenna user, one configuration N r Base station with three antennas; the number of OFDM subcarriers is N c ; The maximum delay of the multipath channel is L, and the delay power spectrum is among them Is the channel power at the i-th time tap. After the user transmit signal is processed by OFDM, it passes through the radio frequency link and is transmitted by the antenna; at the receiving end of the base station, N r The received signal passes through the radio frequency link, and is quantized by a low-precision ADC into a digital signal, then demodulated by OFDM and sent to the baseband for processing.

[0045] figure 2 Gives different ADC accuracy and N c The relationship betwe...

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Abstract

The invention discloses a multi-user large-scale MIMO-OFDM (Multiple Input Multiple Output-Orthogonal Frequency Division Multiplexing) system transmission method adopting a low-precision ADC (Analog-to-Digital Converter), which comprises the following steps: giving a closed expression of an uplink rate to obtain a most favorable condition that a multipath channel delay power spectrum should meet;based on the rate expression, according to the known system parameters and the required user rate, calculating proper sending power and OFDM subcarrier number; under a multipath channel, a multi-userorthogonal pilot frequency sequence based on OFDM is designed; the user sends a pilot signal, and the base station carries out low-precision quantification on the received signal and completes channelestimation; and the user transmits uplink data, and the base station performs maximum ratio combination on the quantized received signals according to the estimated channel. The method can be used for a low-precision ADC multi-user large-scale MIMO-OFDM system, the hardware cost and power consumption of the base station are reduced, and the given transmission method can effectively meet the transmission requirement of the uplink rate of the user.

Description

Technical field [0001] The invention belongs to the field of wireless communication technology, 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 increasing demand for mobile communication transmission rates, massive MIMO technology has become one of the key technologies of contemporary wireless communication systems. The massive MIMO system is equipped with 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 have produced huge power consumption and greatly increased the construction cost of the base station. On the other hand, in order to pursue a larger communication bandwidt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/0413H04L25/02H04L27/26
CPCH04B7/0413H04L27/2602H04L25/0224
Inventor 许威何沐昕赵春明
Owner SOUTHEAST UNIV
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