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81 results about "Equivalent isotropically radiated power" patented technology

In radio communication systems, equivalent isotropically radiated power or, alternatively, effective isotropically radiated power is the amount of power that a theoretical isotropic antenna would emit to produce the peak power density observed in the direction of maximum antenna gain. EIRP can take into account the losses in transmission line and connectors and includes the gain of the antenna. The EIRP is often stated in terms of decibels over a reference power emitted by an isotropic radiator with an equivalent signal strength. The EIRP allows comparisons between different emitters regardless of type, size or form. From the EIRP, and with knowledge of a real antenna's gain, it is possible to calculate real power and field strength values. where and are in dBm, cable losses is in dB, and antenna gain is expressed in dBi, relative to a isotropic reference antenna. This example uses dBm, although it is also common to see dBW. Decibels are a convenient way to express the ratio between two quantities. dBm uses a reference of 1 mW and dBW uses a reference of 1 W. and A transmission output of 50 W is the same as 17 dBW or 47 dBm.

Increasing the range of access point cells for a given throughput in a downlink of a wireless local area network

The present invention provides a method and an apparatus may increase or extend the range of wireless communication cells for a given throughput in a downlink of a wireless communication system. When transmitting data in a downlink of a plurality of access point cells in a wireless local area network (WLAN), the range of the downlink may be increased for a given throughput under one or more radiated power constraints. The method includes providing a plurality of antennas at an access point to transmit the data to a wireless unit under at least one of a first and a second radiated power constraints. The method further includes using the plurality of antennas for beamforming over a group of sub-carriers subject to the first and / or second radiated power constraints. Under one or more radiated power constraints, a multiple antenna based beamforming may extend the range of a wireless communication for a user of a wireless unit that may be located within a coverage area across the plurality of access point cells of a Wi-Fi network associated with the WLAN. A joint beamforming optimized over all of sub-carriers may account for a European regulation restriction into at least one of an averaged and a spectral density Equivalent Isotropic Radiated Power (EIRP) constraint. In this way, an Orthogonal Frequency-Division Multiplexing (OFDM) based joint beamformer may provide a significant performance improvement and range extension.
Owner:WSOU INVESTMENTS LLC +1

Increasing the range of access point cells for a given throughput in a downlink of a wireless local area network

The present invention provides a method and an apparatus may increase or extend the range of wireless communication cells for a given throughput in a downlink of a wireless communication system. When transmitting data in a downlink of a plurality of access point cells in a wireless local area network (WLAN), the range of the downlink may be increased for a given throughput under one or more radiated power constraints. The method includes providing a plurality of antennas at an access point to transmit the data to a wireless unit under at least one of a first and a second radiated power constraints. The method further includes using the plurality of antennas for bearnforming over a group of sub-carriers subject to the first and/or second radiated power constraints. Under one or more radiated power constraints, a multiple antenna based beamforming may extend the range of a wireless communication for a user of a wireless unit that may be located within a coverage area across the plurality of access point cells of a Wi-Fi network associated with the WLAN. A joint beamforming optimized over all of sub-carriers may account for a European regulation restriction into at least one of an averaged and a spectral density Equivalent Isotropic Radiated Power (EIRP) constraint. In this way, an Orthogonal Frequency-Division Multiplexing (OFDM) based joint beamformer may provide a significant performance improvement and range extension.
Owner:WSOU INVESTMENTS LLC +1

Locating Devices in a Wireless Network

Determining the location of a wireless device to be located (DTL) by three or more locating devices (LDs). LDs operating at known locations estimate the distance to the DTL by sending wireless frames to the DTL and varying frame parameters such as transmit power and data rate, searching for the boundary at which the frame is or is not received and ACKd by the DTL. For a given set of frame parameters, the SNR required to be successfully received at the DTL is known. Given that the configuration of the LD is known, the EIRP of the DL is also known. Estimating the noise floor at the DTL, and using the SNR required to successfully receive the frame at the DTL and the EIRP at the LD transmitting the frame, the path loss can be calculated. From the path loss and operating frequency, a distance estimate is calculated. EIRP of the DTL is not and need not be known. Distance estimates from at least three LDs at known locations allow a location for the DTL to be calculated by a location engine (LE). Distance estimates from more than three LDs allow for an overdetermined solution. Distance estimates derived in this manner may be combined with distance estimates calculated using other approaches, such as measuring signal strengths, or TOA / TDOA measurements. The LE process may reside on a central controller supporting the LDs, on one of the LDs, or on any suitable device with network access.
Owner:HEWLETT-PACKARD ENTERPRISE DEV LP

Dynamic power allocations for direct broadcasting satellite (DBS) channels via wavefront multiplexing

A direct broadcasting satellite (DBS) system features a capability of coherently combining amplified signals powers from various broadcasting transponders without modifying the satellite segment. Organized DBS transponders would function as an equivalent DBS transponder with a higher EIRP. Power allocations are via a mechanism in an uplink transmitter in a ground segment and power combining mechanisms are in user receivers in a user segment. Specifically, the transmitter generates mixtures of input signals by using Wavefront-Multiplexing and transmits wavefront-multiplexed (WFM) signals which are sent concurrently through multiple parallel channels of transponders in the satellite segment. A receiver in the user segment separates the mixtures of received amplified WFM signals and coherently combines amplified components by various transponders by adaptive equalizing and Wavefront De-Multiplexing processors. The WFM signal mixtures allow an operator, or automated system, at the transmitter to dynamically allocate the equivalent transponder powers according to continuously changing demands.
Owner:SPATIAL DIGITAL SYST

EIRP statistical calculation method

In a system for providing data content to and from a plurality of mobile platforms where each of the mobile platforms transmits a return link having an EIRP to a predetermined location via a satellite-mounted transponder, a method for controlling an EIRP of the aggregate return link emissions of the mobile platforms. The method includes the steps of determining a probability distribution of the EIRP of the return link for each of the mobile platforms; and determining a probability distribution of the EIRP for the aggregate return link emissions using the probability distributions of the EIRP of the return link for each of the mobile platforms; determining an aggregate off-axis EIRP density envelope for a predetermined probability level and the probability distribution of the EIRP for the aggregate return link emissions.
Owner:THE BOEING CO

Self-adaptive distance data transmission method for aircraft-mounted terminal

The invention provides a self-adaptive distance data transmission method for an aircraft-mounted terminal and aims to provide a data transmission method capable of improving transmission link utilization rate and data transmission efficiency and also provides a self-adaptive implementation method for the data transmission between the aircraft-mounted terminal and a data transmission receiver. The self-adaptive distance data transmission method is realized through the following technical scheme: an aircraft inertial navigation system provides inertial navigation data for the aircraft-mounted terminal in real time through a serial port, a link margin estimator of the aircraft-mounted terminal calculates the distance between an aircraft and the data transmission receiver in real time according to the inertial navigation data and works out the system margin of the data transmission link according to the stored data transmission receiver relevant parameters, the data transmission link parameters and the parameters such as the EIRP (effective isotropic radiated power) value of the antenna of the aircraft-mounted terminal, the aircraft-mounted terminal automatically selects data transmission speed, carries out coded modulation on data in different data transmission speeds through an encoder and a modulator, and transmits the data to the data transmission receiver after up-conversion and amplification processing.
Owner:10TH RES INST OF CETC

Method for analyzing working performance of damaged satellite-earth data transmission antenna

ActiveCN104467987AComprehensive assessment of work performance impactEase of evaluationTransmitters monitoringTerrainAntenna polarization
A method for analyzing the working performance of a damaged satellite-earth data transmission antenna comprises the steps of (1) calculating the equivalent isotropic radiated power (EIRP) of a satellite according to the output power of a satellite transmitter, satellite antenna gain and the transmission channel loss value; (2) calculating the maximum slant range R of signal transmission according to the mean terrain level of a satellite and the minimum elevation of a ground receiving antenna; (3) calculating the free space loss Lf of a signal according to the downlink carrier frequency of the satellite data transmission signal and R; (4) calculating all transmission losses L of the data transmission signal according to the atmosphere loss, the directivity loss of the receiving antenna, the polarization loss and atmosphere value of the receiving antenna and Lf; (5) calculating the bit signal to noise ratio of a received signal by means of the coding gain, the transmission code rate, the coding rate and the link margin; (6) calculating the bit signal to noise ratio actually needed by the received signal according to bit error rate requirements so as to obtain the channel margin, wherein if the margin is positive, the overall performance of the damaged data transmission antenna can still meet the requirements of a system, and the working performance of the data transmission antenna is affected otherwise.
Owner:CHINA ACADEMY OF SPACE TECHNOLOGY

Apparatus and method for enquiring channel condition information in cognitive radio wireless communication system

A method of operating a Data Base (DB) server for storing spectrum condition information on a licensed system in a Cognitive Radio (CR)-based wireless communication system and a CR-based wireless communication system are provided. The method includes determining changes in the spectrum condition information on the licensed system, recalculating maximum Equivalent Isotropically Radiated Power (EIRP) allowed for each channel of CR-based devices registered in a list, and transmitting information regarding the recalculated maximum allowed EIRP.
Owner:SAMSUNG ELECTRONICS CO LTD

Radiation testing system for simulation television station transmitting power under open ground environment

The invention provides a radiation testing system for simulation television station transmitting power under an open ground environment, and belongs to the field of radio transmission system performance index testing. The testing system comprises a directional receiving antenna, power measuring equipment, a ranging and locating device and a control device; the directional receiving antenna is used for receiving electromagnetic waves transmitted by a simulation television station, converting the electromagnetic waves into electric signals and transmitting the electric signals to the power measuring equipment; the power measuring equipment calculates the peak power Pr incident on the receiving antenna according to the electric signals; the ranging and locating device is used for measuring the height h1 of a transmitting antenna, the height h2 of the receiving antenna and the distance L between the receiving antenna and the transmitting antenna; the control module comprises a equivalent isotropic radiated power estimating module, and the equivalent isotropic radiated power estimating module is used for calculating the equivalent isotropic radiated power (EIRP) of a tested station. The radiation testing system for the simulation television station transmitting power under the open ground environment can achieve more comprehensive and accurate monitoring on a station radio transmission system including transmitters and antenna feed systems, and therefore the working flexibility and autonomy are greatly improved.
Owner:国家无线电监测中心 +2

300MHz-800MHz simulation television station transmitting power radiation testing method

The invention discloses an unmanned aerial vehicle low-altitude radiation testing method for the transmitting power of a 300MHz-800MHz simulation television station and belongs to the field of testingof performance indexes of the radio station equipment. The method comprises the following steps: firstly, information of a tested simulation television station is collected, and the unmanned aerial vehicle and the measuring equipment are preprocessed; then, the receiving antenna of the unmanned aerial vehicle is aligned to the transmitting antenna of the tested station, the unmanned aerial vehicle receives the control of an unmanned aerial vehicle control device in the air, and the attitude is adjusted in real time; the distance between the transmitting antenna and the receiving antenna is measured through a distance measuring and positioning device; finally, the measuring equipment calculates the transmission path loss A and converts an electromagnetic wave into an electric signal, the peak power Pr transmitted to the receiving antenna is calculated according to the electric signal, and the equivalent isotropic radiated power EIRP of the tested station is calculated. According to themethod in the invention, the terrain limitation is greatly reduced, the performance indexes of the broadcast television station equipment are more comprehensively and accurately detected so as to obtain a relatively high precision test result; and the timeliness, the flexibility and the autonomy of the detection work of the broadcast television station equipment are improved.
Owner:国家无线电监测中心
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