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iterative error diffusion decision ofdm channel estimation method with ici cancellation

A channel estimation and error technology, applied in the field of OFDM iterative channel estimation, can solve problems such as system performance degradation, affecting the accuracy of channel estimation algorithms, interference, etc.

Inactive Publication Date: 2016-04-06
BEIJING UNIV OF TECH
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AI Technical Summary

Problems solved by technology

The time selection feature causes the subcarriers of the OFDM system to no longer be strictly orthogonal, resulting in intersubcarrier interference (ICI), which degrades the system performance and affects the accuracy of the channel estimation algorithm. In a high-speed mobile environment, the ICI The impact will be more serious

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  • iterative error diffusion decision ofdm channel estimation method with ici cancellation
  • iterative error diffusion decision ofdm channel estimation method with ici cancellation
  • iterative error diffusion decision ofdm channel estimation method with ici cancellation

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Embodiment Construction

[0062] Below in conjunction with accompanying drawing of description, specific embodiment of the present invention is described:

[0063] see figure 1 As shown, it is a model diagram of the OFDM system to which the iterative error diffusion judgment OFDM channel estimation method with ICI elimination of the present invention should be adapted. Baseband signal modulation, serial / parallel conversion is first performed on the data source, after adding virtual subcarriers, IDFT is used to perform OFDM modulation, parallel / serial conversion and guard interval insertion, the generated time domain signal is filtered, digital-to-analog (D / A ) is converted and sent out; after the signal propagates through the wireless channel, the analog-to-digital (A / D) conversion and low-pass filtering operations are first performed at the receiving end, and after the guard interval is removed, serial / parallel conversion is performed, and the frequency domain is decomposed by DFT transformation Afte...

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Abstract

The invention discloses an evaluating method of an OFDM (orthogonal frequency division multiplexing) channel by iterative difference dispersion judgment with ICI (intersubcarrier interference) elimination. The method comprises the following steps of initializing an OFDM system, inserting pilot frequency data into sending data in a comb pilot frequency way, and starting to send the data; sending the data to a receiving terminal through the OFDM system, and modeling the channel at the receiving terminal by a basis expansion model; initializing a Kalman filter, calculating a time updating equation of the Kalman, using the pilot frequency to assist the evaluation of a Kalman channel without ICI interference, calculating an evaluating value of a channel matrix, and detecting the data by QR (orthogonal-triangular) decomposition; using the pilot frequency to assist the evaluation of a frequency domain channel without ICI interference; and meanwhile, designing a judging index of the iterative results, reducing the influence of unknown data on the evaluation of all frequency point channels, selecting the optimum evaluation result from all iterative results, and inhibiting the difference dispersion caused by the ICI interference, so as to improve the performance of the OFDM system.

Description

technical field [0001] The invention relates to an OFDM iterative channel estimation method with ICI elimination. In particular, it relates to an iterative error diffusion judgment OFDM channel estimation method with ICI elimination, which belongs to the related field of channel estimation research in wireless communication. Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM) is a multi-carrier modulation technology that modulates the transmitted data symbols on several subcarriers in parallel, and the spectrum of all subcarriers can overlap and maintain orthogonality with each other. Then transmit in separate channels. Compared with other communication systems, it has the advantages of anti-multipath effect, can be combined with other technologies, and suppresses narrow-band interference, etc., which determines that the OFDM system can be widely used in many fields, including asymmetric digital subscriber line (ADSL, Asymmetric Digital Subscribe...

Claims

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Application Information

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IPC IPC(8): H04L27/26H04L25/02H04L25/03
Inventor 张杰杨睿哲马大为张延华
Owner BEIJING UNIV OF TECH
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