Self-adapting channel estimating method applied to 3GPP LTE system

Abstract

The invention discloses a self-adapting channel estimating method applied to 3GPP LTE system. The method comprises the following steps: (1) the LS (least square) channel estimating value at a pilot tone is computed according to reference signals in a receiving data field; (2) interpolation in the time domain is performed according to current frame pilot tone channel estimated value data and reserved delay frame pilot tone channel estimated value data, and a pilot matrix encrypted is obtained through computing; (3) channel delay spread is estimated according to LS estimation value at the pilot tone, then radio frequency channel filtering coefficient is selected according to the delay spread, and the frequency domain estimation value is computed; and (4) channel Doppler spread is estimated according to the LS estimation value at the pilot tone, then time domain filtering coefficient is selected according to the Doppler spread, and the time domain channel estimation value is computed. The self-adapting channel estimating method provided by the invention has a self-adapting capability to channel characteristics, reduces the occupancy rate and working consumption of hardware resource, improves the estimating speed and reduces computation delay of an estimator.

Description

technical field [0001] The present invention relates to a channel estimation method in a multiple-input multiple-output OFDM system, in particular to an adaptive channel applied to a 3GPP LTE (3GPP Long Term Evolution of the Third Generation Partnership Project) system Estimation method. Background technique [0002] In order to meet the needs of "broadband mobile communication" and "wireless broadband access", the 3rd Generation Partnership Project (3GPP) has started the long-term evolution (LTE) standardization process in recent years. The physical layer of the LTE system adopts OFDM-based MIMO technology, so channel estimation is one of the core technologies of the LTE system. A low-complexity, accurate and robust channel estimation method is the key to the realization of LTE system. [0003] Channel estimation is a technique for estimating the instantaneous response of multipath fading of a mobile communication channel, that is, estimating the impulse response of the c...

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Problems solved by technology

[0007] The channel estimation method applied in the LTE system proposed by the present invention is mainly to solve the problem that the existing theoretical method has too high computational complexity and cannot be well applied to the actual hardware system, and provides a low computational complexity and performance A channel estimation method close to the theoretical performance to solve the problem of tight hardware resources in the actual system, so that the receiver can obtain good receiving performance

[0009] The present invention proposes an adaptive channel estimation method that does not require real-time calculation of channel state statistical information, solves the problem of using the LMMSE estimation method in an actual system, and achieves performance close to ideal channel estimation with lower computational complexity. suitable for use in practical systems

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