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Transmission preprocessing method and data demodulation method of transmission preprocessing signals
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A data demodulation and preprocessing technology, applied in the field of precoding, can solve the problem of not supporting multiple data stream transmission of a single UE
Active Publication Date: 2013-01-16
TD TECH COMM TECH LTD
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This method takes into account the impact of noise interference and co-channel interference on system performance while performing precoding, but this method only supports single UE single data stream transmission, and does not support single UE multiple data stream transmission
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Embodiment 1
[0051] Applying the above precoding principle, such as figure 1 As shown, Embodiment 1 of the emission preprocessing method of the present invention mainly includes:
[0052] Step 101, according to the transmission channel matrix H from the base station to each UE k , for each UE, calculate the former F k largest eigenvectors, using the former F k largest eigenvector as the UE's precoding matrix t k column vector of
[0053] Among them, k is the UE number, 1≤k≤K, K is the total number of UEs, H k is the transmission channel matrix from the base station to the kth UE, δ k is the noise variance of the kth UE, F k is the number of data streams supported by the kth UE, N k is the number of antennas at the UE, G k is the mathematical expectation of the transmit power of a single stream, M is the total number of base station antennas; I M×M It is an M×M unit matrix.
[0054] Through this step, the precoding matrix t of each UE can be determined k , t k The number of ...
Embodiment 2
[0064] Such as figure 2 As shown, the second embodiment of the present invention mainly includes:
[0065] Step 201, according to the transmission channel matrix H from the base station to each UE i , for each UE, calculate the former F k largest eigenvectors, using the former F k largest eigenvector as the UE's precoding matrix t k column vector of .
[0066] This step is the same as step 101 and will not be repeated here.
[0067] Step 202, using the precoding matrix t of each UE k ,according to Determine the effective channel between each UE and the base station
[0068] Step 203, according to Effective channel for each UE Perform QR decomposition to get the Q of each UE k ,P k and R k .
[0069] Step 204, using the Q of each UE k ,P k and R k , according to the nonlinear Tomolison Harashima precoding method, for each UE's data vector s k Perform nonlinear precoding to obtain information symbols after nonlinear precoding for each UE
[0070] In t...
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Abstract
The invention discloses a transmission preprocessing method and a data demodulation method of transmission preprocessing signals, wherein the transmission preprocessing method comprises the following steps of: determining a precoding matrix maximizing the signal to noise ratio in the application environment of single-user and multi-data-stream transmission; based on the precoding matrix, determining effective channels between each UE (User Equipment) and a base station; decomposing the effective channels of the UE by utilizing the traditional GMD (General Mean Decomposition) or an SVD (Singular ValueDecomposition) decomposition method; and finally, precoding data vectors sent to each UE by utilizing a decomposing result and the precoding matrix so as to realize the transmission preprocessing to downstream signals of the base station. The invention not only can balance the influences of co-channel interference and noise interference on system performance, but also can support both the single-user multi-data-stream transmission and single-user and single-data-stream transmission.
Description
technical field [0001] The present invention relates to a precoding technology in a mobile communication system, in particular to a transmission preprocessing method capable of eliminating co-channel interference and a corresponding signaldata demodulation method. Background technique [0002] At present, the LTE system can support the transmission of multiple data streams by utilizing the Space Division Multiplexing (SDM) technology. On the user equipment (UE) side, because each UE cannot know the channel state information of other UEs, co-channel interference between different UEs cannot be avoided, while on the base station side, the state information of each channel can be known, so that the base station When the information sent to the UE is preprocessed, the state information of each channel may be used to perform linear precoding to eliminate co-channel interference between different UEs. [0003] Precoding based on Singular ValueDecomposition (SVD) is a linear zer...
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