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A large-scale-MIMO based multi-user uplink frequency synchronization method

A link frequency, multi-user technology, applied in the field of wireless communication large-scale multiple-input multiple-output system

Active Publication Date: 2017-02-22
XI AN JIAOTONG UNIV +1
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Problems solved by technology

But the disadvantage is that when the signal-to-noise ratio is low, blind estimation also requires a large number of data blocks to obtain satisfactory system performance

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  • A large-scale-MIMO based multi-user uplink frequency synchronization method
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  • A large-scale-MIMO based multi-user uplink frequency synchronization method

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Embodiment Construction

[0050] The present invention is described in further detail below in conjunction with accompanying drawing:

[0051] see Figure 1-4 , the system model applicable to the present invention can be found in figure 1 . The system adopts OFDM modulation, and the uplink user end randomly distributes K users, each user is equipped with a single antenna, and is surrounded by p>>1 local scatterers, and the base station is composed of M>>1 antennas uniformly Line Array (ULA). The total number of subcarriers is N, assuming time synchronization between users, the normalized CFO between the kth user and the base station is φ k , which is defined as the ratio between the actual CFO and the subcarrier spacing. The channel matrix between the kth user and the base station is

[0052] in, It consists of P multipath signals. Indicates the complex gain of the incident signal at the lth channel delay, and is independent and identically distributed with each other. steering vector has...

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Abstract

The invention discloses a large-scale-MIMO based multi-user uplink frequency synchronization method. A base station terminal in the method has a large scale uniform antenna array, and a multi-user terminal performs frequency synchronization through a base station reception antenna under uplink OFDM modulation. Since an incident signal sent by each user to the base station is limited to a narrow angle range under the influence of multipath, carrier frequency offset estimation and compensation are performed for each user using a joint space-frequency alignment method. In the invention, thanks to the spatial degree of freedom provided by the large-scale antenna array, a steering vector corresponding to the corresponding qualified direction of arrival of each user is used to perform reception wave beam formation to enable multi-user interference to be effectively suppressed. The multipath reception wave beam formation method makes an equivalent single-user transmission model form between each user and the base station, so that traditional single-user channel estimation and data detection technology can be used.

Description

【Technical field】 [0001] The invention relates to a wireless communication massive multiple-input multiple-output (Massive MIMO) system, in particular to a massive MIMO-based multi-user uplink frequency synchronization method. 【Background technique】 [0002] With the rapid development of modern communication technology, wireless communication has permeated every aspect of people's daily life. When people yearn for higher data transmission rates, better spectrum utilization, and more users, but the current wireless communication services can no longer meet the needs of the public, we began to explore the key technologies of the next generation of wireless communication—— Massive MIMO. [0003] Massive MIMO is an extension of traditional MIMO technology, which was first proposed in 2010 by Thomas L. Marzetta, a scientist at Bell Labs. The number of antennas configured at the base station for massive MIMO wireless communication is 1-2 orders of magnitude of that in the 4G sys...

Claims

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Application Information

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IPC IPC(8): H04B7/0413H04B7/06H04B7/08
CPCH04B7/0452H04B7/0617H04B7/068H04B7/0897
Inventor 张渭乐高飞飞王惠亮
Owner XI AN JIAOTONG UNIV
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