Multicarrier communication method and device having no time and frequency protection intervals
A technology of multi-carrier communication and frequency protection, applied in the field of information transmission, can solve the problems of increasing system spectrum efficiency and power efficiency overhead, affecting system performance, reducing spectrum efficiency and power efficiency, etc.
Active Publication Date: 2016-03-23
中国人民解放军海军航空大学航空作战勤务学院
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Problems solved by technology
Due to the existence of multipath interference and the unsatisfactory characteristics of the transmission channel, the modulated signal will inevitably be distorted during transmission, which will inevitably affect the orthogonality between subcarriers, and then affect the performance of the system.
In a typical OFDM multi-carrier modulation system, the influence of multipath interference on signal orthogonality is overcome by inserting a cyclic prefix (Cyclic Prefix, CP). The cyclic prefix does not transmit information, and its existence reduces the spectral efficiency and power efficiency
The length of the cyclic prefix is usually 1/5-1/4 of the symbol period. Taking the cyclic prefix of 1/5 symbol period as an example, its system bandwidth utilization rate in the most
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Embodiment 1
[0052] According to a first aspect of the present invention, a multi-carrier communication method without time and frequency guard interval is provided, figure 1 , figure 2 They are respectively a structural flowchart of the sending unit and the receiving unit of the multi-carrier communication system.
[0053] The implementation steps of the modulation process include: serial-to-parallel conversion of pre-adjustment information, parallel digital baseband constellation mapping, parallel in-phase and quadrature branch baseband shaping, quadrature carrier frequency up-conversion modulation, and superposition output.
[0054] The specific modulation process is:
[0055] First, serial-to-parallel conversion is performed on the preset data, and the high-speed serial data stream is converted into M low-speed parallel data streams, where M is the number of subcarriers;
[0056] Secondly, the baseband constellation mapping is performed on the pre-adjustment data of each branch resp...
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The invention provides a multicarrier communication method and device having no time and frequency protection intervals, and belongs to the technical field of information transmission. Orthogonality, required by a multicarrier system, between sub carriers waves is abandoned; from the point of a sub carrier wave modulation signal extraction, through combinations with a sine and cosine frequency conversion technology and a basic characteristic of a Hilbert conversion, sub carrier wave modulation signals are extracted from received signals one by one, and separate demodulation is performed on the sub carrier wave modulation signals then, so the common problem that an orthogonal system multicarrier system has the high dependence degree of the orthogonality between the sub carrier waves, multicarrier transmission having no time and frequency protection intervals is achieved, and frequency spectrum efficiency and power efficiency of the multicarrier system are improved. In a multi-path attenuation channel, compared with an OFDM multicarrier technology, the method and device have an obvious performance advantage. The communication method device provided by the invention are suitable for any communication frequency band, and a set of new scheme is provided for design of a 5G mobile communication system, a new-generation broadband satellite broadcast television system and other communication systems.
Description
technical field [0001] The present invention relates to radio communication technology, more specifically, the present invention relates to a multi-carrier communication method and device without time and frequency guard interval, belonging to the field of information transmission technology. The invention can be applied to all wired and wireless communication systems using multi-carrier modulation and demodulation technology and common communication lines using single carrier modulation and demodulation technology. Background technique [0002] In recent decades, multi-carrier modulation technology has been greatly developed. This type of modulation technology has been widely used for its outstanding spectral efficiency and anti-interference ability. OFDM (Orthogonal Frequency Division Multiplexing) modulation technology is a typical multi-carrier modulation Technology has been widely used in wired, radio and optical communications, and has formed a variety of wired and wir...
Claims
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Login to view more IPC IPC(8): H04L25/02H04L27/26
Inventor 康家方王红星刘传辉
Owner 中国人民解放军海军航空大学航空作战勤务学院
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