A Differential Spatial Modulation Method
A space modulation and differential technology, applied in the field of information transmission, can solve problems such as demodulation cannot be completed, occupy channel resources, increase information transmission costs, etc., and achieve low-cost transmission and save channel resources.
Inactive Publication Date: 2018-12-21
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology
The main disadvantage of the existing spatial modulation technology is that the channel state information is required to solve the antenna number. When the channel state information is unknown, the demodulation cannot be completed, and the transmission of the channel state information needs to occupy channel resources.
In addition, when the channel state changes slower than the symbol transmission rate, the channel parameters are not updated quickly. Although the existing spatial modulation technology is suitable for practical applications, in high-speed mobile scenarios, the channel changes rapidly. If the receiving end needs to obtain accurate channel state Information needs to constantly update channel parameters, which increases the cost of information transmission
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Embodiment Construction
[0021] The present invention will be further described below in conjunction with accompanying drawing.
[0022] The present invention proposes a new differential space modulation (DSM) scheme for the situation of two antennas at the sending end, which breaks through the limitation that the signal constellation is equal energy, activates the antenna with the idea of differential coding at the sending end, and combines the differential coding at the receiving end. Thought, the demodulation method and bit error rate performance curve are given.
[0023] Using the idea of differential encoding, the method of designing and selecting antennas at the transmitting end is (the number of transmitting antennas is 2, and the serial numbers of the two antennas are 0 and 1 respectively): if the antenna number working at the current moment is 0, when the input binary symbol is When 0, the active antenna number will not change at the next moment, and antenna 0 is still selected for activa...
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The invention discloses a differential spatial modulation method. The method is used for solving the problems that according to an existing modulation method, the occupied channel resources are many, and the information transmission cost is high. The technical scheme is that according to the method, a binary sequence determined by an activation antenna is set in transmitting signals of a binary antenna; a code element of the binary sequence is expressed according to whether the activation antenna is changed or not at adjacent moments; and at a receiving end, whether the activation antenna is changed or not is judged according to the difference between the signals received at the adjacent moments, therefore the binary sequence determined by the activation antenna is restored, and the spatial modulation information is demodulated accurately. According to the method, for the condition that there are two antennas at a sending end, the new differential spatial modulation scheme is provided; and the spatial modulation information is demodulated accurately under the condition that channel sate information is unknown. Compared with a traditional method, the method has the advantages that the required channel resources are reduced, and the low-cost information transmission in a high-speed mobile scene is realized.
Description
technical field [0001] The invention relates to a differential space modulation (DSM) scheme suitable for a binary antenna information transmission system, and belongs to the technical field of information transmission. Background technique [0002] The concept of spatial modulation (SM) proposed by R.Mesleh and H.Haas et al., the basic idea is: in any transmission time slot, only one antenna is activated to transmit data, the other antennas do not transmit signals, and the transmission information is passed through the signal The domain and the space domain are transmitted at the same time, a part of the transmitted information bits are mapped to the space domain to select the antenna to be activated, and the rest of the information bits are mapped to select the modulation information that actually needs to be transmitted. [0003] Compared with other Multiple-Input Multiple-Output (MIMO) technologies, the characteristics of spatial modulation include: 1) Only one antenna i...
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IPC IPC(8): H04L1/06
CPCH04L1/06
Inventor 高强范丽敏余萍
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)