A signal detection method for mimo systems based on arbitrary order space-time block codes
A space-time block code and detection method technology, applied in transmission systems, multi-carrier systems, digital transmission systems, etc., can solve the problems of no space-time block code matrix design scheme and receiver design, etc., to improve system diversity gain, The effect of improving flexibility
Active Publication Date: 2022-04-22
SOUTHEAST UNIV
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[0002] At present, space-time block coding technology is a popular research direction nowadays. The communication system realized by it is a multi-input and multi-output system, which performs joint coding in space and time, and there is no limit to the transmitted signal. When some special communication systems The transmitted signal can only be a non-negative real number. Considering this limitation, there are many designs of space-time block code matrices with a fixed number of inputs, but when the number of inputs at the transmitter is arbitrary, there is no corresponding space-time block code matrix. Time Block Coding Matrix Design Scheme and Receiver Design
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[0061] see figure 1 and figure 2 , this implementation provides a MIMO system signal detection method based on arbitrary order space-time block codes. In this embodiment, the number of emitting light-emitting diodes LED is 4, the number of receiving photodiodes PD is 1, and the channel matrix is h=[h 1 , h 2 , h 3 , h 4 ]’s visible light communication system as an example, the signal processing process is as follows figure 1 shown;
[0062] 1. The signal processing process of the transmitter
[0063] Step 1. Construct the pulse amplitude modulation M-PAM constellation diagram of the visible light system
[0064] Specifically, assuming that the modulation method in a communication system is equal-spaced M-PAM modulation, M is the pulse amplitude modulation order, the constellation point spacing is denoted as d, and the spacing is greater than zero, and the modulation signal set is S={d,2d ,…,nd,(n+1)d,…,2nd}, let 2A=(2n+1)d, record d, 2d,…,nd as x 1 ,x 2 ,...,x n ,...
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The invention discloses a MIMO system signal detection method based on an arbitrary-order space-time block code. In the method, the elements in the space-time block code matrix are taken from a pulse amplitude modulation constellation diagram. In a traditional multiple-input multiple-output system The real orthogonal space-time block code matrix of is called the original matrix, and all its non-negative numbers are set to zero, and the negative numbers are set to a certain positive real number. The size of this positive real number is equal to twice the value of the center point of the modulation constellation, and the new matrix obtained Adding the original matrix, we get a space-time block code matrix of any order, and design a corresponding maximum likelihood detector to realize independent decoding. After moving the constellation diagram to the non-negative interval, the present invention meets the requirements of the non-negative real number communication system for any transmitted signal, realizes the input of any order at the transmitting end, improves the flexibility of the system, and uses the space-time block code technology to improve the System diversity gain.
Description
technical field [0001] The invention relates to the technical field of space-time coding communication, in particular to a signal detection method of a MIMO system based on an arbitrary-order space-time block code. Background technique [0002] At present, space-time block coding technology is a popular research direction nowadays. The communication system realized by it is a multi-input and multi-output system, which performs joint coding in space and time, and there is no limit to the transmitted signal. When some special communication systems The transmitted signal can only be a non-negative real number. Considering this limitation, there are many designs of space-time block code matrices with a fixed number of inputs, but when the number of inputs at the transmitter is arbitrary, there is no corresponding space-time block code matrix. Time block code matrix design scheme and receiver design. Contents of the invention [0003] In view of this, the object of the present...
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IPC IPC(8): H04L27/34
CPCH04L27/345
Inventor 蒋良成孙成楠陈明
Owner SOUTHEAST UNIV