99 results about "Mobile channel" patented technology

A radio base station includes multiple antennas associated with a cell. Multiple mobile radios are selected to receive transmissions over a shared radio channel during a predetermined time interval. Information is transmitted over the shared radio channel to multiple mobile radios in the cell during the predetermined time interval using multiple antenna beams. As a result, interference from the transmission appears as white additive Gaussian noise in time and in space in the cell. A “flashlight effect” caused by a single beam transmission over the shared channel during a predetermined time interval that would normally detrimentally impact mobile channel quality detection is avoided. Other methods for avoiding the flashlight effect are described.

The invention discloses a method for measuring the signal quality of a mobile channel; through the monitoring of the signal quality of a beaconing channel of a service cell where a mobile terminal is positioned, when the signal strength of the beaconing channel has small changing amplitude, namely not exceeding the preset threshold value, the method pauses to measure a beaconing channel of a neighboring cell; and when the paused time length exceeds the timing period or the absolute value of the changing amplitude value of the signal strength of the beaconing channel of the service cell exceeds the preset threshold value, the measuring process is restarted. The method, can reduce the measuring time of the terminal, can greatly reduce energy consumption of a battery by the mobile terminal and prolong the standby time of the mobile terminal.

The invention provides a multichannel real-time data transmission method of a self-adaptive bandwidth. The method comprises the following steps: compounding a plurality of data streams existent on a terminal device into a converged data stream; self-adaptively adjusting code rate of each data stream according to the total data volume of the converged data stream; dividing the converged data stream into a plurality of data packets suitable for transmission volume of an IP network, and selecting an IP channel for each data packet; transmitting each data packet to a back-end platform through the IP channel selected for the data packet. Through the adoption of the method provided by the invention, a plurality of mobile channels are compounded into a communication channel, the total bandwidth of the mobile communication channel is increased, and a transmission requirement of a higher data bandwidth is satisfied; the sending rate can be self-adaptively adjusted, so that the channel bandwidth can be utilized in maximum efficiency, and the data delay can be controlled in a reasonable range, the demand of real-time video transmission is satisfied.

A channel equalizer of a terrestrial digital TV receiver using a VSB modulation method is disclosed. By using a precise channel estimator according to the LS method, the transmission channel can be precisely estimated regardless of the characteristic of the transmission channel. By performing the channel equalization in the frequency domain based on the estimated channel, since the channel can be precisely compensated for, and a firm frame synchronization is supplied even to the time-varying multiple path channel, it can be exhibited superior performance even a mobile channel. Moreover, since the FFT implemented by hardware simpler than the transversal filter of the time domain can be used, the equalization is performed not the time domain but the frequency domain, a longer equalizing range can be obtained.

The invention relates to a mobile communication system of trains, planes and the like in a high-speed moving environment, in particular to a high-speed train wireless communication device and a high-speed train wireless communication method, and belongs to the field of wireless information transmission. In a communication way provided by the invention, a relay station is arranged on a high-speed train, and a channel transmission environment between each user and the relay station is relatively static or moves at a low speed and can support relatively high data speed transmission. A high-speed mobile channel is formed between the relay station and a base station. High-speed communication between a user and the base station can be realized by optimally designing the transmission way between the relay station and the base station. Influence of train body penetration loss of the high-speed train on transmission performance can be avoided by reasonably arranging the relay station on the train.

The invention discloses a dual-frequency antenna mobile phone, which comprises an SD card interface, a low-frequency antenna with the frequency of 13.56MHz, a high-frequency antenna with the frequency of 2.4GHz, a security certification module and a payment module, wherein the security certification module checks whether the bound number in a payment card is consistent with a sequence number of an SIM card of a mobile phone, if the bound number is consistent with the sequence number of the SIM card, the bound number in the payment card is transmitted to a certification center through a mobile channel, and is subjected to security certification by the certification center; the payment module comprises an on-site payment module and a remote payment module, wherein the on-site payment module comprises a short-distance payment module using the low-frequency antenna and a middle-distance payment module using the high-frequency antenna, which are switched through a payment control key; and the remote payment module finishes the wireless payment behavior through a mobile communication network. The mobile phone terminal provided by the invention can be separated from a financial payment card and has a plurality of coexisting payment modes. Therefore, the problem of the coexistence of short-distance, middle-distance and long-distance payment of the payment card on the terminal is solved.

This invention discloses one ice making device, which can realize water supply, ice making and ice removing in refrigerator with at band integral ice making with at least one mobile channel device, wherein, the invention ice device is used for vertical transmission band continuous ice making device composed of several ice processing cases on transmission band to realize water injection and cooling process.

A method is provided to determine optimal data rate and packet length in mobile networks. The method directly determines the optimal packet length (L) and data rate (D), which allows fast convergence in the mobile channel. The method automatically identifies and quantifies channel conditions, as well as adjusts parameters according to changes of channel conditions. A variable (Channel condition Index (CCI)) is abstracted from simulations and then used to describe and quantify the impact of three components of channel conditions: signal-to-noise ratio (SNR), multipath environment and velocity. Based on packet completion rate (PCR) status, the channel condition is identified in terms of CCI value. Once CCI is identified, the model of effective throughput G is directly optimized to locate the best packet length (L) and data rate (D).

Disclosed herein is a method for eliminating the reception interference signal of a Space-Time Block Coded Orthogonal Frequency-Division Multiplexing (STBC-OFDM) system in a high-speed mobile channel. The method includes the following steps. At the first step, the gain of a channel combined at a receiving end is estimated in the case of using the STBC-OFDM system on a time-varying channel. At the second step, first temporary decision symbols are obtained by performing comparison on the estimated gain. At the third step, second temporary decision symbols are obtained using the first temporary decision symbols. At the fourth step, self-channel interference (SCI) terms are eliminated using the second temporary decision symbols and third temporary decision symbols are obtained. At the fifth step, final data symbols are obtained using the third temporary decision symbols.

The invention discloses an uplink vertical handoff method for allocating and occupying priority channels between heterogeneous networks. The heterogeneous networks include a cellular mobile network and a wireless local area network. Based on the sufficient consideration of forcible handoff characteristic of uplink vertical handoff (UVH) and the requirement on voice business for real-time property, the uplink vertical handoff method for allocating and occupying cellular mobile channels on the basis of priority is provided by defining the priorities of UVH calls and newly-added cellular calls having cellular mobile channel allocating and occupying requirements in a single-cellular coverage zone. The method disclosed by the invention has the advantage of further improving the loss rate performance of UVH calls having the forcible handoff characteristic while maintaining high utilization rate of the cellular mobile channels of the system and lower blocking rate performance of the newly-added cellular calls, thereby effectively ensuring higher communication service quality of intercommunication system businesses of the cellular mobile network and the Wireless Local Area Network (WLAN).

The invention discloses a capture method of frequency deviation which is applicable to a block signal with the big frequency deviation. The invention utilizes a lead data structure to factor factors which simultaneously influence the capture range and the estimation precision of the frequency deviation in the prior technology into two factors with relevant intervals and lengths through the lengthof a sliding window and the choosing of the displacement position of the sliding window. Because the relevant interval determines the capture range of the frequency deviation, and the relevant lengthdetermines the estimation precision of the frequency deviation, the function of increasing the capture range of the frequency deviation is achieved through the method of reducing the displacement position L of the sliding window to reduce the relevant interval when the range of frequency deviation is too big; and the reduction of noise and the estimation precision of the frequency deviation can be improved through the method of increasing the length NL of the sliding window to increase the relevant length. Therefore, the inter-constraint conflict of the estimation precision of the frequency deviation and the capture range is resolved. Furthermore, the invention weakens the impact on the estimation precision of the frequency deviation which is caused by the deep weakness of a wireless mobile channel through the method of conducting a weighted summation on the frequency deviation which is got from different positions.

The invention discloses a method and a system for roll-call testing of optical fibers. The method includes: an RTU (remote terminal unit) performs OTDR (optical time-domain reflectometry) testing for an LMC (land mobile channel) designated optical fiber under control of an LMC and sends an OTDR curve obtained by OTDR testing to the LMC; the LMC receives the OTDR curve to perform fault analysis according to the OTDR curve; and the LMC stores fault analysis results. The method and the system are capable of performing fault testing for the designated optical fibers.

A channel estimator for use in a DVB-T system is capable of high Doppler performance without incurring restrictive delay spread limitations, in a hardware efficient manner. A first channel impulse response is generated that has ambiguity due to under-sampling in the frequency domain. A filter is then used to filter scattered pilots to generate a mask that is capable of resolving the ambiguities. In at least one approach, a finite impulse response filter is used during the mask generation process to generate a snapshot of the channel frequency response in non-real time. In another approach, an infinite impulse response filter is used during the mask generation process to generate a channel frequency response in real time.

The present invention discloses signal transmitting/receiving method and device. It adopts time space multiplexing technology and time space diversity technique adjoined and iteration mechanism possessed, iterate Turbo multiple input /multiple output MIMO orthogonal frequency division multiplexing OFDM signal transmitting/receiving method and device, further improving anti-interference ability, increasing diversity gain, effectively resisting burst error influence in mobile channel, enhancing communication system reliability, transmitting data rate and and error rate performance.

The invention discloses an underwater mobile channel simulation method. The method comprises the following steps: 1) setting environmental parameters and signal parameters of a three-dimensional underwater space communication scene, establishing a motion model of an acoustic source emission platform and a receiving platform and a sea surface height model; 2) real-timely sampling the state of the channel by calling the ray track model for many times to obtain a series of channel snapshots at different time, and calculating a time-varying channel impulse response according to the obtained snapshots; 3) dynamically filtering the transmit signal of the acoustic source transmitting platform in the time domain by using the time-varying channel impulse response to obtain the received signal. Themethod of the invention ensures the accuracy and the precision of the underwater mobile communication channel simulation to a certain extent, and at the same time, the complexity of the simulation realization can be effectively reduced, the memory requirement can be reduced, and the computer operation efficiency can be improved.

The present invention discloses a motor test tool platform. The platform comprises: a substrate, wherein a vertical mobile channel is defined on the substrate; a support main body movably arranged inthe vertical mobile channel and locked at any position in the vertical mobile channel; a dynamometry shaft configured to connect with a dynamometer; a rotor shaft heat portion configured to install arotor of a motor; and a stator fixing portion configured to install a stator of the motor. The motor test tool platform can regulate the height of the support main body so as to regulate the height ofthe shaft center of the dynamometry shaft to adapt dynamometers with different center heights, the stator fixing portion on the support main body can be used to install different models of motor stators with different sizes, one end of the dynamometry shaft is detachedly connected with the rotor shaft head portion, and according to the test requirement, the rotor shaft head portion adaptive to the motor rotor can be replaced, so that the universality is good.