Estimation method of two-dimensional discrete Fourier transform channel with phase compensation
A technology of Fourier transform and inverse Fourier transform, applied to baseband system components, multi-frequency code systems, etc., can solve problems such as inseparability, improve performance, reduce computational complexity, and overcome inseparability
Inactive Publication Date: 2011-07-20
SOUTHEAST UNIV
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[0005] Technical problem: The purpose of the present invention is to provide a two-dimensional discrete Fourier transform channel estimation method with phase compensation, thereby overcoming the problem that the traditional two-dimensional discrete Fourier transform channel estimation method is inseparable in non-uniform pilot patterns , effectively reduce the computational complexity, and at the same time use the time-domain correlation and frequency-domain correlation of the channel to improve the performance of channel estimation
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[0015] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.
[0016] figure 1 For the OFDM baseband system model used in this embodiment, it can be seen from the figure that the frequency domain signal S(k) at the transmitting end is obtained through the inverse discrete Fourier transform (IDFT) to obtain the time domain transmission signal s(n), after adding After the cyclic protection prefix (CP)...
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The invention discloses an estimation method of a two-dimensional discrete Fourier transform channel with phase compensation. The method comprises the following steps of: firstly, receiving a frequency domain received signal from a time-frequency two-dimensional pilot frequency subcarrier specific to a system with non-uniform time-frequency two-dimensional pilot frequency distribution; secondly, performing least squares estimation on the frequency domain received signal of the time-frequency two-dimensional pilot frequency subcarrier to obtain an initial channel parameter estimation value of the time-frequency two-dimensional pilot frequency subcarrier; thirdly, performing two dimension discrete Fourier transform with phase compensation on the initial channel parameter estimation value of the time-frequency two-dimensional pilot frequency subcarrier to obtain an equivalent channel parameter in a two-dimension discrete Fourier transform domain; and finally, performing time-frequency two-dimensional interpolation on the channel parameter estimation value of the time-frequency two-dimensional pilot frequency subcarrier to obtain the channel responses of all time-frequency two-dimensional subcarriers. By adopting the estimation method, the calculating complexity is greatly lowered and the channel estimation performance is enhanced by using the time correlation and the frequency correlation of the channel.
Description
technical field [0001] The invention relates to the communication field, in particular to a channel estimation method in a multi-antenna orthogonal frequency division multiplexing (MIMO-OFDM) system. Background technique [0002] The combination of multiple antenna (Multiple Input Multiple Output, MIMO) technology and Orthogonal Frequency Division Multiplexing (OFDM) technology can effectively improve system throughput and transmission efficiency, and meet the requirements of future mobile communication systems on system capacity. , Spectrum utilization, data transmission rate and many other requirements. MIMO technology can double the system capacity and spectrum utilization without increasing bandwidth. OFDM technology converts wideband channels into several parallel narrowband channels, which can effectively combat multipath fading. In the Long Term Evolution (LTE) standard formulated by the Third Generation Partnership Project (3GPP), the MIMO-OFDM technology is adopted...
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IPC IPC(8): H04L25/02H04L27/26
Inventor 巴特尔仲文范晓骏陈桐刘远龙王亮李振
Owner SOUTHEAST UNIV
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