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A Sparsity Adaptive Channel Estimation Method for Ofdm System

A technology of channel estimation and sparsity, which is applied in the field of channel estimation of OFDM system with adaptive sparsity, to achieve the effect of reducing the number of pilots, improving spectrum utilization, and reducing channel estimation errors

Active Publication Date: 2017-10-17
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

At present, many scholars at home and abroad have achieved good research results in sparse channel estimation. However, the accuracy of channel estimation based on sparsity adaptation still has a lot of room for improvement.

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  • A Sparsity Adaptive Channel Estimation Method for Ofdm System
  • A Sparsity Adaptive Channel Estimation Method for Ofdm System

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Embodiment Construction

[0024] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0025] like figure 1 As shown, the present invention is mainly divided into three steps: acquisition of the channel response at the pilot frequency, channel modeling based on compressed sensing, and reconstruction of the channel impulse response.

[0026] 1. Obtaining the channel response at the pilot

[0027] Multipath fading channels often exhibit sparseness. Consider a time-varying wireless channel, and its time domain impulse response is: where P is the multipath number of the channel, h p (t) and τ p (t) are the complex gain and delay of the p-th path at time t, respectively. Here, 0≤τ p (t)≤τ max , τ max Indicates the maximum path delay.

[0028] Assuming that the coherence time of the channel is longer than the duration of an OFDM symbol, the channel impulse response can be considered to have a time-invariant characteristic fo...

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Abstract

The invention discloses a sparseness adaptive OFDM system channel estimation method, which belongs to the technical field of mobile communication. The method includes the following steps: step 1: obtaining the channel response at the pilot frequency; step 2: establishing a channel model; step 3: constructing the observation matrix and observation value required for signal reconstruction; step 4: recovering the channel impulse according to the reconstruction algorithm response. The method of the invention achieves the purpose of achieving high channel estimation performance without the priori condition of known channel sparsity, and provides a simple and efficient solution for sparse channel estimation; the method can Reduce the number of pilots, improve spectrum utilization, and effectively reduce channel estimation errors.

Description

technical field [0001] The invention belongs to the technical field of mobile communication, and relates to a sparseness adaptive OFDM system channel estimation method. Background technique [0002] The orthogonal frequency division multiplexing (Orthogonal Frequency Division Multiplexing, OFDM) technology is to convert a single high-speed data string into multiple low-rate code streams in parallel, and use multiple orthogonal sub-carriers for parallel transmission. OFDM has high spectral efficiency, flexible resource allocation, good bandwidth expansion and anti-multipath fading. However, OFDM is sensitive to system timing and frequency deviation. Time synchronization error will cause the rotation of the subcarrier phase, and in severe cases, its orthogonality will be broken. Doppler frequency shift will cause frequency synchronization error, causing inter-subcarrier phase rotation Therefore, it is necessary to compensate the amplitude and phase of the signal, so channel e...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/02H04L27/26
Inventor 王永唐彦楠
Owner CHONGQING UNIV OF POSTS & TELECOMM
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