Differential west space-time modulation constellation mapping method in multiple antenna orthogonal frequency division multiplexing
An orthogonal frequency division, constellation mapping technology, applied in the field of communication, can solve the problems of complex constellation design method, high search algorithm complexity, poor generalizability of constellation structure, etc., to increase diversity gain, improve system performance, and expand search space. Effect
Inactive Publication Date: 2007-10-10
江苏南邮信息技术有限公司
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Due to the complexity of the constellation design method in the unitary space time code, the poor generalization of the constellation structure, and the high complexity of the search algorithm for key parameters in the constellation, on the basis of the unitary space time code, Hochwald proposed a differential unitary space time code combined with differential modulation. Time code DUSTM (DifferentialUnitary Space-Time Modulation)
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[0027] The overall framework of the MIMO-OFDM system of the present invention is shown in FIG. 1 , and it is assumed that a structure of two transmissions and one reception is adopted. The input serial information bit stream is divided into p parallel data streams, where p is the number of carriers, and each line of data stream is subjected to differential unitary space-time modulation (DUSTM), and then the first line of data of the output result of each line of differential unitary space-time modulation Merge with the second line of data separately, perform inverse Fourier transform (IFFT), then add cyclic prefix (CP), parallel-to-serial conversion, send out on two antennas at the same time, and perform a series of inverse changes at the receiving end, using the maximum likelihood Natural method (ML) for demodulation.
[0028] The specific scheme of differential unitary space-time modulation and demodulation is as follows:
[0029] 1) At the sending end, the differential uni...
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The method comprises: mapping 0,1 binary bits into L=2RM form symbols - Zk, Zk=0, 1, ....L-1; the mapping is used for making the bits become a form adapted to be transmitted; the information symbol Zk is made with the unitary space-time constellation mapping and is mapped as MXM unitary matrix VAk; each column of the matrix is sent out through its corresponding antenna; taking time block as unit, namely the space-time constellation Xk sent in the time block of number k symbol is the product of the constellation Xk-1 sent in previous time slot and the unitary constellation VZk obtained by unitary constellation mapping; at receiving end, the receiving signals are combined into 2MXM matrix which is decoded using maximum likelihood to get the sending information.
Description
technical field [0001] The invention relates to a constellation mapping scheme for differential unitary space-time modulation signals of a multi-antenna Orthogonal Frequency Division Multiplexing (OFDM) system, belonging to the technical field of communication. Background technique [0002] The continuous development of mobile communication and the increasing demand for communication require the rapid transmission of integrated services on effective spectrum resources, and technologies with extremely high spectrum efficiency are required. MIMO (Multiple Input Multiple Output) technology, that is, using multiple antennas at the transmitting end and receiving end, can double the capacity and spectrum utilization of the communication system without increasing the bandwidth, so it has received more and more attention. . OFDM (Orthogonal Frequency Division Modulation) technology is a multi-carrier transmission technology that utilizes the orthogonality between multi-carriers to ...
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Inventor 陈静朱琦
Owner 江苏南邮信息技术有限公司