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Pilot design method in compressed sensing channel estimation

A channel estimation and compressed sensing technology, applied in the field of communication, can solve problems affecting system performance and achieve the effect of improving performance and accuracy

Active Publication Date: 2017-01-25
XIDIAN UNIV
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Problems solved by technology

Therefore, the pilot designed using the criterion of minimizing the correlation coefficient of the sensing matrix may not be able to obtain more accurate channel estimation, which affects system performance.

Method used

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  • Pilot design method in compressed sensing channel estimation
  • Pilot design method in compressed sensing channel estimation
  • Pilot design method in compressed sensing channel estimation

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Embodiment Construction

[0022] Below in conjunction with accompanying drawing the embodiment of the present invention is described in detail: the present embodiment is implemented under the premise of the method of the present invention, has provided detailed embodiment and concrete operation step, but protection scope of the present invention is not limited to following the embodiment.

[0023] refer to figure 1 , in the Orthogonal Frequency Division Multiplexing OFDM communication system adopted in the present invention, the transmitting end includes modulating user data, performing subcarrier mapping on the modulated data, performing inverse Fourier transform on each subcarrier, and adding a cyclic prefix to obtain the transmission Signal, the receiving end removes the cyclic prefix from the received signal, then performs Fourier transform, and obtains user data through channel estimation and demodulation. The present invention focuses on channel estimation in an OFDM system, and improves the acc...

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Abstract

The invention discloses a pilot design method in compressed sensing channel estimation and mainly solves the problem that an existing design method cannot obtain a comparatively-good pilot pattern in limited-time searches. The method includes the steps of firstly, selecting P carrier positions from N subcarriers of an orthogonal frequency division multiplexing (OFDM) system to serve as a pilot pattern S; secondly, calculating a partial Fourier matrix WL according to the subcarrier number N and the maximum multipath delay L in the system; thirdly, using a random searching method to optimize the pilot pattern S, that is to say, using the partial Fourier matrix WL to calculate a measuring matrix T to obtain an optimized pilot patter Smin serving as the final pilot design result. Compared with an existing pilot design method, the pilot design method has the advantages that the method is good in search stability, better pilot can be obtained, and the method can be used for compressed sensing channel estimation and offline calculation.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to a pilot frequency design method, which can be used for compressed sensing channel estimation. Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM) is the core technology in 3G and 4G mobile communications, and channel estimation is an important part of it. Commonly used channel estimation methods include blind estimation and pilot-based estimation. The pilot-based channel estimation method is more accurate than the blind estimation method, so it has been widely used. [0003] In the traditional pilot-based channel estimation method, the pilot is equivalent to sampling the channel, so the number and insertion position of the pilot must satisfy the Nyquist sampling theorem, otherwise useful channel information will be lost. However, the insertion of the pilot frequency reduces the transmission rate of effective information. [0004] T...

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Application Information

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IPC IPC(8): H04L27/26H04L25/02
CPCH04L25/0224H04L27/2675
Inventor 葛建华李世明宫丰奎阮英文
Owner XIDIAN UNIV
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