Iterative method based on channel estimation errors and data detection errors

A channel estimation error and data detection technology, applied in the baseband system, digital transmission system, baseband system components, etc., can solve the problems of channel estimation and data detection errors and errors, and achieve enhanced correction, mean square error and bit error rate The effect of reducing and increasing accuracy

Inactive Publication Date: 2015-01-28
BEIJING UNIV OF TECH
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Problems solved by technology

In most cases, interference and noise will cause unavoidable errors in channel estimation and data detection, and further errors due to error propagation

Method used

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  • Iterative method based on channel estimation errors and data detection errors
  • Iterative method based on channel estimation errors and data detection errors
  • Iterative method based on channel estimation errors and data detection errors

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Embodiment Construction

[0029] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0030] figure 2 It is a schematic diagram of the MIMO-OFDM system of the present invention. As shown in the figure, suppose the number of transmitting antennas of a MIMO-OFDM system is N T , the number of receiving antennas is N R . The k OFDM symbols on the transmit antenna at the transmitter can be expressed as: The symbols received at the receiver can be expressed as: The MIMO-OFDM system can be expressed as: y k =H k x k +n 0,k , where H k represents the channel matrix, n 0 is Gaussian white noise.

[0031] image 3 It is a schematic diagram of the comb pilot structure of this system. Comb pilot refers to periodically inserting pilot symbols at specific subcarrier positions in the frequency domain, so that there are pilots on specific subcarriers within one OFDM symbol period. Since the comb-shaped pilot can be sent continu...

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Abstract

The invention belongs to the field of wireless communication and relates to an iterative method based on channel estimation errors and data detection errors. The method includes that pilot frequency is inserted according to a comb mode during data sending, and data are sent on different antennae; the data are sent to receiving antennae through a wireless channel, and the channel is subjected to modeling at a receiving end by a basis expansion model (BEM); channel BEM coefficient is subjected to modeling by an autorregressive (AR) model; a filter is subjected to initialization and a time updating equation is calculated; filter noise removal is performed and channel estimation is performed; an estimated value of a channel matrix is calculated; a covariance matrix of the channel estimation errors is calculated to perform successive interference cancellation (SIC) data detection. By means of the iterative method based on the channel estimation errors and the data detection errors, a channel estimation and joint detection algorithm is provided, error information in channel estimation and data detection is fully utilized, the accuracy of channel estimation is improved, and correction of data detection is enhanced.

Description

technical field [0001] The invention belongs to the field of wireless communication. It relates to an iterative method for utilizing channel estimation error and data detection error in a MIMO-OFDM system in a rapidly changing channel environment. technical background [0002] Multiple-input multiple-output (MIMO) technology will increase system capacity and spectrum utilization in flat fading channel environment. However, in the environment of frequency-selective multipath fading channel, the implementation of MIMO technology requires complex channel equalization technology, so it cannot be widely applied to the environment of frequency-selective fading channel. In the face of frequency-selective fading channels, Orthogonal Frequency Division Multiplexing (OFDM) can convert it into several parallel narrowband sub-channels, and the fading on each narrowband sub-channel can be considered as flat fading, which effectively resists Frequency Selective Fading. Therefore, OFDM ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L25/02H04L25/03
CPCH04B7/0413H04L25/0242H04L25/03821H04L25/03968
Inventor 杨睿哲叶斯洋张延华司鹏搏孙艳华孙恩昌
Owner BEIJING UNIV OF TECH
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