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Published in Philip A. Laplante, Comprehensive Dictionary of Electrical Engineering, 2018
signal-to-interference ratio (SIR) the ratio of the average power of the signal component to the average power of the interference component in a case where an information-bearing signal of interest has been corrupted by interfering signals. signal-to-noise plus interference ratio (SNIR) the ratio of total signal power to the sum of total noise power and total interference power at a receiver. The SNIR is a more complete indicator of received signal quality than either SIR or SNR, where the relative contribution of receiver noise and external sources of interference are either unknown or widely varying. It is a unitless quantity. See also signal-to-noise ratio, signal-tointerference ratio. signal-to-noise ratio (SNR) the ratio of the average power of the information signal component to the average power of the noise component in a signal consisting of the sum of an information signal component and a corrupting noise component. It is a unitless quantity. signaling procedures used to control (set up and clear down) calls and connections within a telecommunication network. signaling system 7 (SS7) a communications protocol used in common-channel signaling networks. signature a characteristic easily computed feature or function by which a particular object or signal may be at least tentatively identified. An example is the centroidal profile for an object having a well defined boundary. signature analysis (1) a test where the responses of a device over time are compared to a characteristic value called a signature, which is then compared to a known good one.
Adaptive Arrays
Published in Peter M. Clarkson, Optimal and Adaptive Signal Processing, 2017
The output Signal-to-Noise plus Interference Ratio (SNIR) for the array is defined by () SNIR=signaloutputpowernoiseplusinterferenceoutputpower.
Next Generation Wireless Technologies
Published in K. R. Rao, Zoran S. Bojkovic, Bojan M. Bakmaz, Wireless Multimedia Communication Systems, 2017
K. R. Rao, Zoran S. Bojkovic, Bojan M. Bakmaz
To participate as a cooperative relay, node C must be able to listen to both the clear-to-send (CTS) and request-to-send (RTS) control packets. From the RTS, it can estimate the signal-to-noise-plus-interference ratio (SNIR) between itself and the source, SNIR(AC). Also, it is possible to derive the distance l(A, D) of node A from the final destination D because the RTS contains the identifier of these nodes. From the CTS, which carries the SNIR(AB) value, it may learn whether the quality of the source–destination direct link is poor. If this is the case, node C checks the following two conditions to determine whether or not to contribute: The value of SNIR(AC) must be above SNIRthNode C should represent an advancement toward the final destination D
A Comprehensive Survey on GNSS Interferences and the Application of Neural Networks for Anti-jamming
Published in IETE Journal of Research, 2021
Kambham Jacob Silva Lorraine, Madhu Ramarakula
When a GNSS receiver is affected by interference, it causes several effects on the receiver operation, thereby degrading the receiver's performance. Some of the effects are outlined below Loss of receiver trackingLess measure signal strengthIncrease of noise on the pseudo-range measurementIncrease of noise on the phase measurementIncrease of cycle slip in phase measurementDegraded navigation accuracyEffect on Automatic Gain Control (AGC), and Low Noise Amplifier (LNA) in RF front end.Effect on acquisition and carrier code tracking loopsAn increase in high interference power values causes low Signal to Noise plus interference Ratios (SNIR).It causes the Carrier to Noise Ratio (C/N0) to decrease.Loss of lockNoisier GNSS measurementSevere jitter or large bias in navigation The impact of interference on each stage of the receiver has been discussed in detail in reference [9].
Performance analysis of joint transmit antenna selection and user scheduling for massive MIMO systems
Published in Cogent Engineering, 2021
Fikreselam Gared Mengistu, Gizachew Worku
The second term of Equation (3) will be zero for ZF precoding case as it cancels all interferences from other users. The received signal and signal-to-noise plus interference ratio (SINR) for each user can be expressed as Equations (5) and (6), respectively.