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Subcarrier clustering precoding method for MIMO system
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An orthogonal frequency division, multi-output technology, applied in the field of intelligent high-capacity wireless communication, can solve problems such as channel and coding matrix mismatch, capacity loss, etc., to reduce system complexity overhead and improve system service quality.
Active Publication Date: 2019-04-05
TSINGHUA UNIV
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Using this algorithm can effectively reduce the precoding complexity, but it also introduces a mismatch between the channel and the coding matrix, resulting in capacity loss
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Embodiment 1
[0057] In this embodiment, the MIMOOFDM system subcarrier clustering precoding method includes:
[0058] Use the training sequence Ts to estimate the channel autocorrelation R(t,f);
[0060] Calculate the channel capacity loss threshold T h Constrained channel autocorrelation threshold ζ;
[0061] Based on the clustering rule, the subcarriers (n, k) that meet the clustering rule are divided into one cluster, and the clustering rule is: in
[0062] Represents the kth subcarrier and the kth c The frequency difference between subcarriers;
[0063] Indicates that the nth slot and the nth c The time difference between time slots;
[0064] k is a carrier subscript, indicating that the current subcarrier is the kth subcarrier among the K subcarriers;
[0065] k c is the subscript of the central subcarrier, indicating the subscript of the central subcarrier after carrier grouping;
[0066] n is a time slot su...
Embodiment 2
[0102] This embodiment In this embodiment, the multi-input multi-output OFDM system subcarrier clustering precoding method further includes the following steps on the basis of embodiment 1, that is, precoding the transmission code stream, wherein the precoding The encoding method is as follows:
[0103] Using the training sequence Ts to estimate the cluster center subcarrier (n c ,k c ) channel fading matrix
[0104] Calculate the channel capacity on the center carrier, and allocate the stream rate according to the lost capacity;
[0105] Based on the carrier clustering results, the transmission code stream is clustered and precoded, and the signal sequence P after clustering precoding is obtained. s .
[0106] The operating process of the method of the present invention is as follows:
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Abstract
The invention discloses a subcarrier clustering pre-coding method of a multi-input-multi-output orthogonal frequency division multiplexingsystem. The method comprises the steps of: utilizing a training sequence Ts to estimate a channel autocorrelation function R (t, f); utilizing an absolute capacity loss formula or a relative channel capacity loss formula to calculate a channel correlation threshold [zeta] under constraint of a capacity loss threshold Th; carrying out clustering on subcarriers according to a clustering rule; utilizing the training sequence Ts to estimate a channel fading matrix on a clustering central subcarrier (nc, kc), and updating the channel autocorrelation function; calculating the channel capacity on a central carrier, and distributing code stream speeds according to the capacity after loss; and finally carrying out clustering pre-coding on transmitted code streams according to a carrier clustering result, and returning a signal sequence Ps after the clustering pre-coding process.
Description
technical field [0001] The invention belongs to the field of intelligent large-capacity wireless communication, and deals with the problem of sub-carrier intelligent clustering precoding in a multi-input multi-output orthogonal frequency division multiplexing (MIMO-OFDM) system. Background technique [0002] The MIMO-OFDM system combines the advantages of large capacity and anti-fading characteristics of multiple-input multiple-output (MIMO) technology with the advantages of anti-multipath and anti-frequency selective fading of Orthogonal Frequency Division Multiplexing (OFDM) technology. While increasing the speed, the system reliability is effectively improved. [0003] In order to support the demodulation of the MIMO signal at the receiving end, the transmitting end needs to precode the transmitted signal when the complete channel state (CSI) is known. The precoding operation can reduce the demodulation complexity of the receiving end and improve the channel utilization r...
Claims
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