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Sparsity self-adaptive OFDM system channel estimation method

A channel estimation and sparsity technology, applied in the field of OFDM system channel estimation with adaptive sparsity, to achieve the effects of improving spectrum utilization, high channel estimation performance, and reducing the number of pilots

Active Publication Date: 2014-05-07
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.

Method used

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  • Sparsity self-adaptive OFDM system channel estimation method
  • Sparsity self-adaptive OFDM system channel estimation method
  • Sparsity self-adaptive OFDM system channel estimation method

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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] Such as 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. Acquisition of channel response at pilot frequency

[0027] Multipath fading channels tend to be sparse. Consider a time-varying wireless channel whose time-domain impulse response is: where P is the multipath number of the channel, h r (t) and τ r (t) is the complex gain and delay of the pth path at time t. 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, then the channel impulse response can be considered to have characteristics that do not change with time i...

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Abstract

The invention discloses a sparsity self-adaptive OFDM (Orthogonal Frequency Division Multiplexing) system channel estimation method and belongs to the technical field of mobile communication. The method comprises the following steps of 1, obtaining channel response at a pilot frequency, 2, establishing a channel model, 3, constructing an observation matrix and an observation value both needed by signal reconstruction, and 4, recovering channel impulse response according to a reconstructing algorithm. The method achieves the goal of high channel estimation performance even though a prior condition that the channel sparsity is known is not satisfied, and therefore, a simple and efficient solution is provided for sparse channel estimation; the method is capable of reducing the number of the pilot frequencies, improving the spectrum efficiency and effectively reducing the error of channel estimation.

Description

technical field [0001] The invention belongs to the technical field of mobile communication, and relates to a sparseness self-adaptive OFDM system channel estimation method. Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM) technology is to convert a single high-speed data serial to multiple low-rate code streams, and use multiple orthogonal subcarriers 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 deviations. Time synchronization errors will cause subcarrier phase rotation, which will break its orthogonality in severe cases. Doppler frequency shift will produce frequency synchronization errors, causing subcarriers Interference, so the amplitude and phase of the signal need to be compensated, so channel estimation plays a particularly important role. [0003] At present, channel estimation ...

Claims

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Application Information

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