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Signal transmission method of large-scale antenna system

A large-scale antenna and signal transmission technology, applied in the field of 5G communication, can solve a large number of problems that are not suitable for 5G communication systems

Active Publication Date: 2017-01-04
SHANGHAI TECH UNIV
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Problems solved by technology

Traditional channel estimation schemes based on pilot sequences are not suitable for future 5G communication systems due to the large amount of resources required for pilot sequence transmission.

Method used

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  • Signal transmission method of large-scale antenna system
  • Signal transmission method of large-scale antenna system
  • Signal transmission method of large-scale antenna system

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Embodiment Construction

[0015] In order to make the present invention more comprehensible, preferred embodiments are described in detail below with accompanying drawings.

[0016] The invention mainly solves the problems of blind signal detection and channel estimation in a large-scale antenna system.

[0017] The present invention considers a large-scale antenna system, that is, the situation where the number of antennas (N) at the base station and the number of users (K) in the system are both large. The transmission scheme of the present invention consists of two parts: uplink transmission (from the user end to the base station end) and downlink transmission (from the base station end to the user end).

[0018] First, a brief introduction to channel models in large-scale antenna systems. Assuming that there are K users in the system, each user is configured with M antennas, and the base station is configured with N antennas, and all antennas are arranged in a linear array with a half-wavelength i...

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Abstract

The invention provides a signal transmission method of a large-scale antenna system. The signal transmission method is characterized in that based on the sparsity of channels in an angle domain, uplink transmission and downlink transmission are performed by utilizing a sparse matrix decomposition method, wherein in the uplink transmission process, each user has different user codes and only uses one resource block to transmit a pilot signal; in the downlink transmission process, a base station directly designs precoding strategies according to the uplink channel directions and only needs to distribute one resource block to transmit the pilot signal; a user estimates a channel coefficient value of the downlink channel according to the received pilot signal, then detects data and does not need to feed the channel signal back to the base station. The signal transmission method provided by the invention has the advantage that in the uplink transmission and the downlink transmission, only one resource block needs to be used for transmitting the pilot signal; therefore, the resource utilization rate of the system is obviously increased.

Description

technical field [0001] The invention relates to a signal transmission scheme suitable for a large-scale antenna system, which is used to solve the problems of blind signal detection and channel estimation in the field of wireless communication, and is especially suitable for 5G communication. Background technique [0002] The essence of a wireless communication system lies in how the receiving end recovers the signal at the sending end as accurately as possible. According to whether the receiver needs channel state information in signal detection, signal detection schemes can be decomposed into two categories: coherent signal detection and non-coherent signal detection (also called blind signal detection). [0003] In a traditional communication system, especially in a multiple-input multiple-output (MIMO) system, the coherent detection scheme is a commonly used scheme due to its better signal recovery accuracy. Channel estimation is a very important part of a coherent dete...

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Application Information

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IPC IPC(8): H04B7/04H04L5/00
CPCH04B7/0413H04L5/0048
Inventor 袁晓军张建文
Owner SHANGHAI TECH UNIV
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