Signal detection method of generalized spatial modulation system
A generalized spatial modulation and signal detection technology, which is applied in the field of signal detection of generalized spatial modulation systems, can solve problems such as increased computational complexity, gaps in detection performance, and a small number of receiving antennas
Active Publication Date: 2015-12-02
SHANGHAI JIAO TONG UNIV
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However, at the same time, the GSM system also introduces some ICI, which makes low-complexity receiver design an urgent problem to be solved
[0003] Typical multi-antenna system receivers usually use maximum ratio combining (MRC) or maximum likelihood (ML) detection, but both receivers have their own problems: the former cannot be applied to underdetermined systems, that is, the number of receiving antennas is less than The number of transmit antennas, which is a fatal problem for the downlink; the computational complexity of the latter increases exponentially with the number of antennas and the adjustment order, which is not practical in large-scale high-order modulation systems
However, this detection method is only suitable for low-order modulation. For high-order QAM modulation systems commonly used in wireless communications, its detection performance is still far behind that of ideal maximum likelihood detection.
At the same time, the existing detection methods do not fully utilize the sparsity and quantization characteristics of the signal, which means that there is still a lot of room for improvement in low-complexity, high-accuracy signal detection technology
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[0056] In the environment of Rayleigh fading and additive white Gaussian noise (AWGN), the signal sending and receiving process of the generalized spatial modulation system is as follows: figure 1 shown. When 24 transmitting antennas and 12 receiving antennas are used, and the number of active antennas is 3, there are 1024 possible combinations of active antennas, and the transmission code rate is 22bit / Hz / s under 16QAM modulation. For each time slot, the active antenna sequence is determined by the first 10 bits, and the remaining 12 bits are mapped into constellation symbols in three groups, and then sent to the wireless channel by the activated antenna. The signal detection method of the present invention is mainly carried out at the receiving end, and the flow chart of the method is as follows figure 2 shown. Specific steps are as follows:
[0057] ①Model the sending signal vector x as a multivariate complex Gaussian distribution CN(0,Γ) represented by the parameter γ, a...
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The present invention provides a low-complexity signal detection method under generalized spatial modulation. The method comprise the steps of (1) carrying out parametric modeling on a sending signal, and using a Bayesian compressive sensing iterative method with simplified complex to solve a parameter vector, (2) using signal sparsity information to carry out pre detection on an obtained activation antenna sequence set, and repositioning a partially wrong activation sequence, and (3) using an estimated activation antenna sequence set to carry out linear equalization and demodulation on the sending signal. According to the method, the accuracy of signal detection is greatly improved to approach the ideal result of maximum likelihood, extremely low computational complexity is ensured at the same time, and the method is also applicable to underdetermined and higher order modulation systems.
Description
Technical field: [0001] The invention relates to the technical field of wireless communication, in particular to a signal detection method in a generalized space modulation system. Background technique: [0002] With the improvement of wireless communication technology, "green, energy-saving and sustainable" has become an important development direction of 5G mobile communication in the future. As a new multi-antenna modulation technology, spatial modulation (SM) can effectively reduce system energy consumption and completely eliminate inter-channel interference (ICI) by activating only one transmit antenna per time slot. In order to further improve the spectrum efficiency, generalized spatial modulation (GSM) expands the number of active antennas from one to multiple, which greatly improves the signal transmission rate. At the same time, however, the GSM system also introduces some ICI, which makes low-complexity receiver design an urgent problem to be solved. [0003] Ty...
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IPC IPC(8): H04L25/03H04L1/06
Inventor 王春阳陈鹏归琳罗汉文
Owner SHANGHAI JIAO TONG UNIV
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