The invention discloses a broadband mobile communication method based on a multi-beam GEO satellite. The broadband mobile communication method based on the multi-beam GEO satellite mainly comprises the steps that spot beams at the Ka frequency band are adopted by NG+1 bidirectional feed links between a satellite-borne device and a ground station device, so that space division multiplexing is achieved for NG+1 times; a cellular network with NB cells is formed through NB bidirectional user links between the satellite-borne device and NT mobile user terminals based on an NB-beam satellite antenna, and space division multiplexing is achieved for NB/4 times with every four cells as a group, so that a 260 MHz bandwidth resource can be shared. The invention further discloses a broadband mobile communication system based on the multi-beam GEO satellite. According to the broadband mobile communication method and system based on the multi-beam GEO satellite, any one of the NT mobile user terminals can serve as an independent multimedia communication terminal as well as a local area network connected with a public Internet and can have access to a remote URL through the satellite links of the system, and an Internet service on the level similar to the 4G mobile communication level can be provided for a large number of people on various vehicles.

Broadband mobile communication method and system based on multi-beam GEO satellite

The invention discloses an anti-interference mobile signal framing modulation method for a multimedia broadcast single frequency network, and relates to a mixed framing modulation scheme of the space domain, the time domain and the frequency domain According to the training sequence optimization design, the signal generating scheme and the signal selecting method of the anti-interference mobile signal framing modulation method for the multimedia broadcast single frequency network, OFDM signals can be processed and recovered at a receiver end easily to obtain original signals of the OFDM signals The anti-interference mobile signal framing modulation method for the multimedia broadcast single frequency network has the advantages of being low in peak-to-average power ratio, short in synchronization time, resistant to channel fading, multiple in controllable service and the like

Anti-interference mobile signal framing modulation method for multimedia broadcast single frequency network

The invention provides a method of carrying out device to device communication in a LTE-TDD cellular wireless communication system. The method comprises the following steps that frequency resources are distributed to user equipment which needs to carry out the device to device communication, wherein a format of the frequency resources is the same with a format used by a cellular link in the cellular wireless communication system; the user equipment carries out the device to device communication on the frequency resources, wherein the user equipment uses same wireless access modes on a sending terminal and receiving terminal.

Method of device to device communication and apparatus thereof

Air-space information network information transmission method

The invention provides a collaborative spectrum perception method based on credibility in a mobile scene, relates to the technical field of information and communication and aims to solve the problem that malicious user attacks probably exist in the network of the mobile scene of cognitive users. The method comprises the following steps: through the adoption of the concept of the credibility, firstly, the whole trial zone is partitioned into a plurality of small cells; then detection results uploaded by all the cognitive users are compared in each cell, the credibility of the cognitive users are independently updated so as to serve as references to reject malicious users and weight coefficient of each cell is calculated; through the simulation verification, the situation that the method provided by the invention can obtain favorable system detection property can be realized. In the network with 50 cognitive users, among whom 15 are malicious users, when the false alarm probability of the system is 0.1, the system detection probability obtained through the adoption of the collaborative spectrum perception method is 0.99. Specific to the scene that the cognitive users are mobile and major users are static, the collaborative spectrum perception method is used for overcoming the malicious attacks launched by the malicious users in the system.

Collaborative spectrum perception method based on credibility in mobile scene

The invention relates to a multiple-address signal processing method of a wideband satellite communication link in a next-generation communication system, belonging to the technical field of satelliteThe invention relates to a multiple-address signal processing method of a wideband satellite communication link in a next-generation communication system, belonging to the technical field of satellitecommunication and mobile communication and solving the problems that a future broadband multimedia satellite system has no optimal on-board processing method of multiple-address access system yet at communication and mobile communication and solving the problems that a future broadband multimedia satellite system has no optimal on-board processing method of multiple-address access system yet atpresent. The invention comprises two multiple-address signal processing methods of the wideband satellite communication link in the next-generation communication system; one method adopts an OFDMA modpresent. The invention comprises two multiple-address signal processing methods of the wideband satellite communication link in the next-generation communication system; one method adopts an OFDMA mode and is characterized in that fast Fourier transform is adopted to simply realize high-speed transmission processing, a circulating prefix is used so as to have stronger robustness to multi-path chane and is characterized in that fast Fourier transform is adopted to simply realize high-speed transmission processing, a circulating prefix is used so as to have stronger robustness to multi-path channel loss and intersymbol interference, and a receiving terminal is provided with a structure with channel estimate and balance functions; and the other method adopts an SC-FDMA mode and is characteriznel loss and intersymbol interference, and a receiving terminal is provided with a structure with channel estimate and balance functions; and the other method adopts an SC-FDMA mode and is characterized in that a discrete Fourier transform extended module is added after a serial-parallel module so as to sequentially enter a fast Fourier transform module and lower a PAPR value. The invention has thed in that a discrete Fourier transform extended module is added after a serial-parallel module so as to sequentially enter a fast Fourier transform module and lower a PAPR value. The invention has the advantages of simple method, reasonable design, reliable performance and greater popularization value.e advantages of simple method, reasonable design, reliable performance and greater popularization value.

Multiple-address signal processing method of wideband satellite communication link in next-generation communication system

The invention relates to the technical field of information and communication, in particular to a multi-bit judgment cooperation self-adaptation spectrum sensing method based on confidence degrees in a cognition OFDM system to solve the problem that all cognition user local detection results are not fully utilized The confidence degree concept is introduced into a multi-bit judgment model for the probably existing situation that malicious user attack and the inconsistent signal to noise ratio exist and several users are in the deep fading scene in the actual application scene According to the multi-bit judgment cooperation self-adaptation spectrum sensing method, the cognition users carry out local judgment firstly, a fusion center carries out weight fusion and comparison judgment, the confidence degree increment is calculated according to the weighted average difference between the cognition user local judgment results and all cognition node judgment results, and the confidence degrees of all cognition users are updated and are utilized to solve respective weights for next time detection The multi-bit judgment cooperation self-adaptation spectrum sensing method is suitable for information and communication occasions

Multi-bit judgment cooperation self-adaptation spectrum sensing method based on confidence degrees in cognition OFDM system

The invention relates to the cognitive radio network spectrum sensing technology in the technical field of wireless communication, in particular to a method for cooperative spectrum sensing based on the D-S evidence theory under the condition of malicious user attacks in a mobile model. The method aims to meet the demand for cooperative spectrum sensing based on the D-S evidence theory under the condition that malicious users provide false sensing information in a dynamic topological structure. The method for cooperative spectrum sensing is based on the D-S evidence theory under the condition that the malicious users provide the false sensing information in the dynamic topological structure. The method mainly comprises the two steps that firstly, a cognitive user authentication mechanism is implemented in a cooperative sensing meshed network, and the number of malicious cognitive users is reduced through the reliable authentication mechanism; secondly, the robustness of the data fusion algorithm of a cognitive network on the malicious attacks of the cognitive users is improved, and false sensing results of the malicious users are found and removed in time. The method is suitable for cooperative spectrum sensing based on the D-S evidence theory under the condition of malicious user attacks in the mobile model.

Method for cooperative spectrum sensing based on D-S evidence theory under condition of malicious user attacks in mobile model

The invention discloses a multilayer satellite network stable grouping method based on five vector mathematical models, relating to satellite network grouping method in wireless communication field, and solving conflict among stability of existing satellite network topology, satellite node router storage cost and service time delay of satellite network. Five vector mathematical models describing multilayer satellite network topology property is adopted and link stability measuring function is utilized to realize optimizing configuration on network resource; the method for quantitatively analyzing contribution degree of links between different satellites to network stability and influence of satellite node or link failure on satellite delay change is adopted to reduce the length of the average shortest routing table of the network and improve the stability of network topology structure according to the network stability measuring function and the optimizing connection relation among satellites of the same group or adjacent groups. The inventive method can be applied multilayer satellite network environment in an aerospace, aerospace and ground integral information network.

Multilayer satellite network stable grouping method based on five vector mathematical models

The invention discloses an interference alignment based signal processing method for an MIMO (Multiple Input Multiple Output) system in a nonideal channel state, relates to the field of wireless communication, and aims to increase the capacity of the MIMO system in the nonideal channel state. According to the signal processing method, after a central processing unit of a sending end well designs encoding matrixes and decoding matrixes, the encoding matrixes and the decoding matrixes are allocated to each base station, and the base stations transmit the corresponding decoding matrixes to corresponding receiving users. Namely, under the condition that the power of each user is limited and the channel state information has errors, linear encoding and decoding matrixes which enable the total average mean square error (MSE) of the users to be minimum are searched for optimization, firstly, precoding matrixes are initialized, and then the precoding matrixes and the decoding matrixes are updated in an iterating manner, so that the system throughput can be effectively increased.

Interference alignment based signal processing method for MIMO (Multiple Input Multiple Output) system in nonideal channel state

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