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MIMO-OFDM (Multiple-Input Multiple-Output-Orthogonal Frequency Division Multiplexing) fast time-varying channel estimation method

A MIMO-OFDM, time-varying channel technology, applied in radio transmission systems, digital transmission systems, electrical components, etc., can solve problems affecting the orthogonality of sub-carriers in OFDM systems, reduce system performance, etc., to reduce ICI and improve estimation. Accuracy, the effect of improving stability and precision

Active Publication Date: 2018-01-16
SUN YAT SEN UNIV
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Problems solved by technology

At the same time, high-speed mobile users also have a large Doppler frequency shift, which will seriously affect the orthogonality of OFDM system subcarriers, generate subcarrier interference (ICI), and reduce system performance.

Method used

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  • MIMO-OFDM (Multiple-Input Multiple-Output-Orthogonal Frequency Division Multiplexing) fast time-varying channel estimation method
  • MIMO-OFDM (Multiple-Input Multiple-Output-Orthogonal Frequency Division Multiplexing) fast time-varying channel estimation method
  • MIMO-OFDM (Multiple-Input Multiple-Output-Orthogonal Frequency Division Multiplexing) fast time-varying channel estimation method

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Embodiment 1

[0027] The present invention provides a MIMO-OFDM fast time-varying channel estimation method with high estimation accuracy and estimation efficiency. The specific implementation steps are as follows:

[0028] 1. Insert MIMO-OFDM regular pilot at the sending end

[0029] MIMO conventional pilots are inserted on the specific subcarriers of each OFDM symbol of each transmit antenna, and the insertion requirements of the conventional pilots meet 1) equidistant; 2) equal energy; 3) phase-shifted and orthogonal. And the number I of subcarriers inserted into the pilot should satisfy I≥NL. And the expression of the pilot symbol is: the symbol on the ith pilot subcarrier of the nth transmit antenna is: E is the energy of the pilot. Note that the same pilot is inserted for each segment of OFDM symbols. At the same time, in order to fully reflect the frequency characteristics of the channel, the distance between the pilot subcarriers should be as large as possible, that is, At the...

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Abstract

The invention relates to an MIMO-OFDM (Multiple-Input Multiple-Output-Orthogonal Frequency Division Multiplexing) fast time-varying channel estimation method. The method comprises the following steps:S1, inserting an optimal pilot frequency into a subcarrier selected for each OFDM symbol of a transmitting end, and making optimal pilot frequency symbols on any two selected subcarriers alternate; S2, transmitting transmitted data through an MIMO fast time-varying channel after OFDM modulation; S3, performing OFDM demodulation on received data on an mth receiving antenna at a receiving end, thenextracting a received signal on a pilot frequency point, and estimating a channel coefficient from each transmitting antenna to the receiving antenna through a transmitted optimal pilot frequency andthe extracted received signal, wherein the calculated channel coefficient is a channel efficient value (shown in the description) at a middle point moment of the OFDM symbol, t represents a middlepoint moment of a pth OFDM symbol, and n represents an nth transmitting antenna at the transmitting end; and S4, fitting channel coefficient values on other time points of the OFDM symbols by a complex exponential basis expansion model.

Description

technical field [0001] The present invention relates to the technical field of communication, and more specifically, to a MIMO-OFDM fast time-varying channel estimation method. Background technique [0002] With the rapid development of the mobile Internet, the substantial increase in data services has put tremendous pressure on wireless communications. People are using more and more multimedia services. The necessity of improving frequency band utilization and system capacity in wireless communication systems is becoming more and more prominent. MIMO-OFDM technology is a data transmission solution that will play an important role in 3G, 4G, and even 5G communications, and has always been regarded as a hotspot in the field of communications research. At the same time, high-speed mobile users also have a large Doppler frequency shift, which will seriously affect the orthogonality of OFDM system subcarriers, generate subcarrier interference (ICI), and reduce system performance...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02H04L5/00H04B7/0413
Inventor 戴宪华洪旭东
Owner SUN YAT SEN UNIV
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