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Channel estimation method and device for MIMO (multiple input multiple output) OFDM (orthogonal frequency division multiplexing) system

A technology of orthogonal frequency division and channel estimation, applied in the field of communication, can solve the problem of low accuracy of estimation algorithm, and achieve the effect of improving accuracy

Active Publication Date: 2015-04-01
ZTE CORP
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  • Application Information

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Problems solved by technology

[0007] The present invention aims to provide a channel estimation method and device for a MIMO system to solve the problem of low accuracy of estimation algorithms in the related art

Method used

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  • Channel estimation method and device for MIMO (multiple input multiple output) OFDM (orthogonal frequency division multiplexing) system
  • Channel estimation method and device for MIMO (multiple input multiple output) OFDM (orthogonal frequency division multiplexing) system
  • Channel estimation method and device for MIMO (multiple input multiple output) OFDM (orthogonal frequency division multiplexing) system

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Embodiment 1

[0044] This embodiment describes in detail the specific implementation process of the above channel estimation algorithm. In this example:

[0045] Training pilot symbol: a symbol known to both the transmitting and receiving ends, which is transmitted by a specific subcarrier of the first OFDM symbol (that is, the training OFDM symbol) of the data frame. In training OFDM symbols, for N t The qth antenna among the first transmitting antennas inserts K training pilot symbols at equal intervals, the first subcarrier number of which transmits the training pilot symbol is q-1, and the amplitude is sent at the non-training pilot symbol subcarrier 0 symbol for 0.

[0046] Reference pilot symbol: It is a symbol known to both the transmitting and receiving ends, and is transmitted by a specific subcarrier of the OFDM symbol (that is, the OFDM symbol for data transmission) after the first OFDM symbol of the data frame. All transmit antennas transmit reference pilot symbols by the sam...

Embodiment 2

[0058] A conventional MIMO-OFDM transmission system consists of channel coding, space-time coding, OFDM modulators on each transmission channel (serial-to-parallel transformation, IFFT, adding cyclic prefix (Cyclic Prefix, referred to as CP)) and digital-to-analog conversion (D / A) and up-conversion are finally transmitted through each antenna. For channels with rich multipath and large multipath delay, the subcarrier information on each OFDM may experience flat fading, which is conducive to equalization. The receiver is the inverse process of transmission, including down-conversion of each receiving channel, analog-to-digital conversion (ADC for short), time / symbol and frequency synchronization, channel estimation equalization, FFT demodulation, parallel-to-serial conversion, Space-time decoding and channel decoding. The whole process is briefly described as follows:

[0059] sender:

[0060] Figure 4 It is a schematic diagram of a data transmission frame structure accord...

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Abstract

The invention provides a channel estimation method and device for an MIMO (multiple input multiple output) OFDM (orthogonal frequency division multiplexing) system. The method comprises the following steps of: determining the channel response of a multipath channel between a receiving antenna and a transmitting antenna based on the signal received by the receiving antenna; performing inverse Fourier transform on the determined channel response to obtain the impulse response of the multipath channel; performing iterative time-variable filtering on the impulse response of the multipath channel; and performing Fourier transform on the filtered impulse response. The invention solves the problem of lower estimation precision resulted from that the factors are not considered in the relevant technologies, thus improving the channel estimation precision.

Description

technical field [0001] The present invention relates to the communication field, in particular to a channel estimation method and device for a Multiple-Input Multiple-Output Orthogonal Frequency Division Multiplexing (MIMO-OFDM for short) system. Background technique [0002] With the development of digital signal processing technology and high-speed devices, the initial obstacles to OFDM have disappeared. OFDM has been used in Digital Audio Broadcasting (Digital Audio Broadcast, DAB), Digital Video Broadcasting (Digital Video Broadcast, DVB) ) and wireless local area network (Wireless Local, referred to as WLAN) and other systems have been successfully applied. OFDM utilizes the orthogonality between sub-carriers, allows the spectrum of sub-channels to overlap each other, and can utilize spectrum resources to a great extent. It converts the high-speed data stream through serial-to-parallel conversion, so that the duration of the data symbol on each subcarrier is relatively...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/02H04L27/26
Inventor 铁敏豪余秋星
Owner ZTE CORP
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