Transmission method of system parameters in cognitive radio communication system

A technology of system parameters and transmission methods, applied in transmission systems, multi-frequency code systems, digital transmission systems, etc., can solve the problems of high adaptive transmission complexity, inability to adapt to dynamic perception, and long superframe period.

Inactive Publication Date: 2014-11-26
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Problems solved by technology

In some traditional communication protocols, the superframe period is long, which cannot adapt to dynamic perception; in the inf

Method used

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  • Transmission method of system parameters in cognitive radio communication system
  • Transmission method of system parameters in cognitive radio communication system
  • Transmission method of system parameters in cognitive radio communication system

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Embodiment Construction

[0045] The simulation platform will be constructed below, and the simulation result diagram will be given. System simulation parameters: the number of FFT points is 512, the CP length is 128, the main channel is QPSK modulation, the length of the 6th order kasami sequence is P=63, and the length of the 8th order kasami sequence is P=255. The real part and the imaginary part are divided into two ways of transmission, and the reception of additional information only considers one way of information. If the additional channel is direct-sequence spread spectrum, you can choose to truncate the PN sequence so that the additional information after spreading is consistent with the length of the OFDM subcarrier. Only the kasami sequence loading information is described in the following steps.

[0046] 1) Perform 1 / 4LDPC encoding and QPSK modulation on the main information.

[0047] 2) Assuming that the additional information has been coded with kasami sequences in advance, the kasami...

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Abstract

The invention discloses a transmission method of system parameters in a cognitive radio communication system, and belongs to the technical field of wireless communication. The method includes the steps that a transmitting party stacks main channel information and auxiliary channel information (system information) together on frequency domain information stacking on the basis of an OFDM technology, and transmits the information after IFFT and cyclic prefix adding are carried out on the information; after cyclic prefix removal and FFT are carried out on the received information, a receiving party carries out decoding to obtain the main information, then removes the main information from the received information, and then demodulates out the auxiliary information, wherein the auxiliary information is encoded according to a kasami sequence; on the premise of ensuring reliable transmission of original service information (a main channel), the transmission technology on the frequency domain information stacking (an auxiliary channel) achieves transmission of the system parameters of a cognitive network, and can adapt to dynamic frequency spectrum switchover, and the design complexity is reduced.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a system parameter transmission method in a cognitive radio communication system. Background technique [0002] With the increasing social demand, various wireless communication technologies are rapidly developing and applied in various fields of social life, and the shortage of spectrum resources is becoming increasingly prominent. However, studies have shown that some spectrum resources are still not fully utilized, there are a large number of idle frequency bands, and spectrum resources are seriously wasted. The emergence of cognitive radio technology (CR) provides an effective way to solve the problem of underutilization of spectrum resources, and has become a research hotspot in recent years. It can perceive the transmission parameters of the surrounding wireless environment (such as the operating frequency of authorized users and cognitive users,...

Claims

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Application Information

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IPC IPC(8): H04L27/26H04L5/00
Inventor 刘光辉朱美松朱婧王艳艳
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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