Cooperation relay transmission method and system based on fast fading Rayleigh channel
A technology of cooperative relay and transmission method, applied in transmission systems, digital transmission systems, diversity/multi-antenna systems, etc., can solve the problems of high signal processing complexity, strict equipment requirements, and low signal-to-noise ratio at the destination node. The effect of reducing complexity, reducing interference, and reducing bit error rate
Inactive Publication Date: 2018-10-26
XIDIAN UNIV
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However, there will be delay interference between the signals forwarded by the relay node, and the signal-to-noise ratio is small. At the same time, the complexity of signal processing by the destination node is high, and the requirements for equipment are strict.
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[0041] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0042] It should be noted that the terms "comprising" and "having" and any variations thereof in the embodiments of the present invention are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or process that includes a series of steps or units. The apparatus is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to the pr...
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The invention discloses a cooperation relay transmission method and system based on a fast fading Rayleigh channel. The method includes the following steps: a source node broadcasts a symbol sequencein a cooperation transmission network; N relay nodes respectively receive the symbol sequence and a demodulation symbol sequence to obtain a symbol block, whether the symbol block is correct is verified through CRC, a verified correct symbol block is considered as a to-be-coded symbol block, and a plurality of relay nodes of the detected to-be-coded symbol block from the N relay nodes are separately considered as cooperation relay nodes to obtain R cooperation relay nodes; the R cooperation relay nodes separately performs DLC-STC coding on the to-be-coded symbol block obtained by the verification to obtain a coding symbol sequence, zero padding processing is performed on the coding symbol sequence to obtain a coded signal, and coding signals are sent to a destination node; and the destination node receives the coding signals respectively sent by the R cooperation relay nodes by utilizing a maximum likelihood receiver. According to the method, diversity gain can be improved, the error rate can be reduced, and the transmission rate of the system can be improved.
Description
technical field [0001] The present invention relates to the technical field of wireless communication, in particular to a fast-fading Rayleigh channel-based cooperative relay transmission method and system. Background technique [0002] In the cooperative communication system, by using different relay nodes to forward the signal of the source node for cooperative communication, the cooperative diversity gain can be obtained, thereby effectively improving the system performance. However, because the relay nodes are geographically dispersed and have independent crystal oscillators, the signals forwarded by different relay nodes to the destination node have different transmission delays, that is, delay errors, which bring huge overhead to the system. Therefore, the system usually works in an asynchronous state. When the system works in an asynchronous state, the delay error will cause inter-symbol interference, destroy the distributed coding structure, weaken the diversity gai...
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IPC IPC(8): H04B7/026H04L1/00
CPCH04B7/026H04L1/0054H04L1/0059H04L1/0061
Inventor 刘毅刘轩喻丹阳刘淑华马莹张海林
Owner XIDIAN UNIV