Channel estimation method and system based on two-dimensional interpolation
A channel estimation and two-dimensional interpolation technology, which is applied in the field of channel estimation based on two-dimensional interpolation, can solve problems such as unfavorable implementation, high complexity, and high algorithm complexity, and achieve the effects of easy implementation, improved performance, and low algorithm complexity
Active Publication Date: 2019-01-08
GUANGDONG PLANNING & DESIGNING INST OF TELECOMM
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Problems solved by technology
When performing interpolation, one-dimensional interpolation makes the accuracy of channel estimation lower. Although two-dimensional scatter interpolation has higher accuracy, the complexity of implementation is correspondingly higher.
[0008] In summary, the existing interpolation methods are difficult to guarantee the performance of channel estimation, the accuracy of channel estimation is low, and the algorithm complexity is high, which is not conducive to the realization of
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[0027] The specific implementation manners of the channel estimation method and system based on two-dimensional interpolation of the present invention will be described in detail below with reference to the accompanying drawings.
[0028] refer to figure 1 as shown, figure 1 It is a flowchart of a channel estimation method based on two-dimensional interpolation in the present invention, including the following steps:
[0029] (1) Establish the channel model of the OFDM system.
[0030] In the OFDM system, the fast Fourier transform IFFT is used to divide the channel bandwidth into multiple sub-channels in the frequency domain, each sub-channel is adjusted with a sub-carrier, and the sub-carriers are orthogonal to each other and transmitted in parallel.
[0031] refer to figure 2 as shown, figure 2 It is a schematic diagram of the OFDM system model. The coded binary data is transformed into frequency domain data X(k) through modulation (for example: QBSK), k=0,1,...,N-1,...
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The invention provides a channel estimation method and a channel estimation system based on two-dimensional interpolation. The channel estimation method comprises the steps of: (1) establishing a channel model of an OFDM system; (2) adopting a rhombic pilot insertion style, and inserting pilot symbols in directions of time domain and frequency domain of OFDM symbols of the channel model respectively to obtain an original sending signal with two-dimensional interpolation; (3) carrying out channel estimation on the original sending signal received by a receiving end to obtain a pilot point position and an estimated channel value thereof; and (4) dividing a rhombic pilot plane into two regular sub-pilot planes according to the estimated channel value, conducting channel response interpolation on each sub-pilot plane, and calculating an average value to obtain a channel response estimated value. According to the technical scheme provided by the invention, the channel estimation is carried out by adopting the rhombic pilot insertion style combined with an improved bicubic two-dimensional interpolation method, the performance of channel estimation is improved, the complexity of the algorithm is low, and the channel estimation method and the channel estimation system are easy to implement.
Description
technical field [0001] The present invention relates to the field of communication technology, in particular to a channel estimation method and system based on two-dimensional interpolation. Background technique [0002] In the LTE standard, the downlink adopts Orthogonal Frequency Division Multiplexing (OFDM) modulation, and the uplink adopts Single Carrier Frequency Division Multiple Access (SC-FDMA) modulation. OFDM is a multi-carrier modulation method. It overcomes the frequency selective fading of the channel by reducing and eliminating the influence of intersymbol crosstalk. Its basic principle is to divide the signal into N sub-signals, and then use N sub-signals to modulate N mutually Orthogonal subcarriers. Since the frequency spectrums of the subcarriers overlap with each other, higher frequency spectrum efficiency can be obtained. [0003] The inter-symbol interference (ISI) caused by the multipath delay spread of the wireless channel seriously limits the data t...
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IPC IPC(8): H04L25/02H04L27/26
Inventor 李炯城肖恒辉李桂愉陈运动管学峰
Owner GUANGDONG PLANNING & DESIGNING INST OF TELECOMM