Upstream channel estimation method and upstream channel estimation system suitable for LTE (Long Term Evolution)-Advanced system

Abstract

The invention relates to an upstream channel estimation method and an upstream channel estimation system suitable for an LTE (Long Term Evolution)-Advanced system. The upstream channel estimation method comprises the steps of extracting pilot frequency subcarrier information on a receiving antenna, and carrying out conjugate multiplying on the pilot frequency subcarrier information and a local pilot frequency of a first layer to obtain a frequency domain channel coefficient of all transport layers subjected to aliasing; according to the length of a subcarrier, adding a virtual subcarrier with a corresponding length at the tail of a primary channel coefficient; carrying out IDFT (Inverse Discrete Fourier Transform) calculation, and transforming to a time domain; adding a window in the time domain, because dislocation of a time domain impulse response of each transport layer occurs on the time domain, separating time domain impulse responses of different transport layers, and carrying out time domain cyclic shift to obtain a time domain impulse response corresponding to each transport layer; and carrying out DFT (Discrete Fourier Transformation) calculation on the time domain impulse response of each transport layer, transforming to the frequency domain, and removing the virtual subcarrier at the tail to obtain a frequency domain equivalent channel estimation matrix of each transport layer corresponding to the receiving antenna. With the adoption of the upstream channel estimation method and the upstream channel estimation system, the channel estimation problem after MIMO (Multiple Input Multiple Output) is introduced into the LTE-A upstream can be effectively solved, and the channel estimation accuracy is also improved; and the method is also suitable for an LTE system.

Description

Technical field [0001] The present invention relates to a wireless communication system, and more specifically, to an uplink channel estimation method and system for an LTE-Advanced system. Background technique [0002] Long Term Evolution-Advanced (LTE-Advanced) is a smooth evolution based on LTE. It is the 3rd Generation Partnership Project (3GPP) in order to meet the requirements of the International Telecommunication Union (ITU). The 4G (the4th Generation) standard proposed by the IMT-Advanced requirements put forward, it further improves the performance of the system on the basis of ensuring backward compatibility with the LTE system, and finally meets or exceeds the requirements of IMT-Advanced. [0003] The LTE-A system puts forward performance requirements that the downlink peak rate exceeds 1 Gbit / s and the uplink peak rate exceeds 500 Mbit / s. In order to meet this requirement, LTE-A has introduced more advanced communication technologies relative to LTE: such as carrier ...

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Problems solved by technology

[0006] In order to solve the limitations of the traditional channel estimation method on the LTE-Advanced system, the present invention proposes an uplink channel estimation method and system suitable for LTE-Advanced system precoded MIMO, which can effectively solve the channel after the LTE-A uplink introduces MIMO Estimation problem, while improving the accuracy of channel estimation, this method is also applicable to LTE system

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