| 1dB compression point | Signal level at which a nominally linear RF device's gain is degraded by 1 dB due to compression
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| 1kT | SKA - (1kT was an earlier name)
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| 4PSK | = QPSK
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| 4QAM | = QPSK
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| AJ | Anti Jam - counter measures to stop jamming signals
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| ALM | Asynchronous Logic Machine
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| AMPS | Amplitude Modulated Phone System
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| ASIC | Application Specific Integrated Circuit
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| ASK | Amplitude Shift Keying - signal moduation process
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| ATM | Asynchonous Transfer Mode - networking standard
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| AWAC | Audio Waveform Amplifier and Converter
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| AWGN | Additive White Gaussian Noise
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| BOS |
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| BPA |
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| BPSK | Binary PSK
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| Bragg grating |
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| CBF | Conventional beamformer
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| CDMA | Code division multiple access - cellular transmission
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| CIC filter | Cascaded Integrator Comb filter; a multirate filter designed for computationally-efficient filtering with high decimation (high input-to-output sample rate ratios)
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| COTS | Commercial off the shelf - ie buy rather than build
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| CPM | Constrained power minimization
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| EDF | Erbium-Doped Fiber
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| FDM | Frequency Division Multiplexing
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| FDMA | Frequency Division Multiple Access
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| FIR | Finitie Impulse Response
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| FPGA | Field Programmable Gate Array
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| FSK | Frequency switched keying - signal moduation process
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| FTF | Fast Transversal Filter
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| GSM | Global system for mobile communications
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| INR | Interference to noise ratio
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| IQ mapping | In digital communications, the relationship between carrier magnitude-phase states and the inferred bit combinations
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| Jones matrix |
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| LMDS | Local Multipoint Distribution Service - digital wireless
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| LMS | Least Mean Squares
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| LOFAR | 0.01 - 0.1 GHz Square Kilometre Array
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| LSL | Least-Squares Lattice
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| MARY |
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| MDL rank estimator | MDL= Minimum Description Length; A method for estimating the number of eigenvalues of a covariance matrix which associated with signals (as opposed to noise)
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| MIPS | Million instructions Per Second
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| MLSR | Maximum Length Shift Register
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| MMIC | Millimetre Monolithic Integrated Circuit
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| MOS | Metal Oxide Semiconductor
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| MUX | Multiplxer ?
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| MV | Minimum Variance
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| MVDR | Minimum Variance Distortionless Response
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| Measurement Equation |
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| Minimum Description Length | MDL= Minimum Description Length; a method for estimating the number of eigenvalues of a covariance matrix which associated with signals (as opposed to noise)
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| Mobilsat |
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| Neyman-Pearson Detector |
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| OFDM | Orthogonal FDM
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| PAM | Pulse Amplitude Modulator
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| PAST | Projection Approximation Subspace Tracking
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| PCI Canceller |
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| PLL | Phase Locked Loop
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| POTS | Plain Old Telephone System - analog circuit switched
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| PRI | Pulse Repetition Interval
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| PRN | Pseudorandom Noise (typically bit sequences which are designed to have minimum correlation except when perfectly aligned)
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| PSK | Phase Shift Keying - signal modulation process
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| QPSK | Quadrature PSK
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| QRD |
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| RAID |
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| RLS | Recursive Least Squares
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| ROT | Really Old Technology
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| SAP |
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| SDR | Signal to Distortion Ratio
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| SFDR | Spurious-Free Dynamic Range; the difference between the maximum signal power at which the system is still linear and the power associated with the spurious products in that condition
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| SHARC | Super Harvard Architecture Computer - also a trade name for a family of DSP microprocessors by Analog Devices, Inc
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| SINR | Signal-to-Interference-plus-Noise Ratio
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| SIR | Signal-to-Interference Ratio
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| SKA | Square Kilometre Array - next generation radio telescope
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| SNR | Signal to Noise Ratio
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| STAP | Space Time Adaptive Processing
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| STSP | Subspace Tracking Spatial Projection
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| Shaping Filter |
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| TDM | Time Division Multiplexing
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| TDMA | Time Division Multiple Access
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| UWB | Ultra-Wideband
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| VHDL |
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| WCDMA | Wideband Code Division Multiple Access
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| WDM | Wavelength Division Multiplexing
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| Xilinx | A manufacturer of FPGAs
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| adaptive canceller | Using a reference signal, removes interference, preserves spec.
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| adaptive excision | Using a reference signal, chops out piece of spectrum
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| amouratise |
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| antenna station |
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| array gain | Maximum gain of an array or "array factor"
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| array response | Set of outputs for a given input signals
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| autocorrelation |
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| blocks |
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| channel detectors | Demodulation is detection of data sent or power detection
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| closed-form expressions |
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| commutator |
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| complex envelope form | Baseband form times the carrier exp^(j*omega*t)
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| composite transfer |
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| concentrator |
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| correlation lags |
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| covariance matrix | A matrix whoses elements are the autocorrelations and crosscorrelations between antennas (in an array) or taps (in a tapped delay line)
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| depolarisation | Repolarisation on a time scale faster than data is sampled
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| delay beam |
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| eigenvalues |
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| eigenvalues of R |
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| equalisation |
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| excision | Signal removal by "cutting out", typically involving loss signals with overlapping frequency or spatial spectrum
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| eye diagram |
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| fringe pattern |
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| gray code |
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| hybrid |
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| interference | Any undesired signal entreing a receiver system
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| interferer sample covariance matrix |
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| intermodulation | Unintentional mixing of two signals, typically due to a nonlinearity
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| isolation |
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| jammer | Interference intended to disable a receiver
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| lagrange2 |
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| liklihood ratio test |
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| look direction |
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| main beam |
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| manifold errors | Out of band gain, phase, mutual coupling, receiver errors
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| matched filter | Maximises the peak pulse signal to noise ratio
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| maximum composite |
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| model order |
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| modified LMS | Constrained LMS
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| multi-rate filter | A filter with different input and output sample rates
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| multi-rate processing | Using multi rate filters to condition signals
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| narrowband data model |
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| non-stationary | Time variable statistics
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| nyquist channel |
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| parametric cancelling | Cancellation using a detail model of undesired signals
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| partitioned |
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| pattern rumble | Sidelobe gain variations
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| peristaltic |
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| phase closure |
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| plinking | Removal of sinusoidal (single-frequency) signals by estimating their magnitude, frequency, and phase, followed by subtraction from the original data
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| polyphase filter |
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| power inversion | Result of applying a predicitve canceller SIR = 1/SIR
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| predictive canceller | Adaptive canceller with no ref signal assumes high ISR
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| ISR | Interference to signal ratio
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| predictive canceller constrained | Predictive canceller using knowledge of signal
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| probability density |
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| quiescent weight vector | The desired beamforming weights for the case in which no interference is present
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| rank detector | Something which estimates the number of "significant" (non-noise) eigenvectors
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| receptor |
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| repolarisation | Rotation of polarisation vector during transmission of
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| a 100% polarsied signal |
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| return loss |
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| sample vectors |
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| samplers | Analog to digital converters
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| self cal |
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| serration error |
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| slot length |
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| smarts | Clever ideas
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| sparse array | An array with typical element spacing >> lambda/2
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| spatial correlation matrices | Same as "covariance matrix", but specific to the array case
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| spatial signature vectors | Time-averaged output from an array
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| speckling |
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| spectral estimates |
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| splatter |
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| stationarity |
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| subarray |
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| subband filtering |
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| subband multichannel detection |
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| subband processing | Breaking a wide bandwidth into smaller bands for independent processing, typically to allow delays to be treated as phase shifts
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| subspace | Lower-dimensional parts of a "space"; Example: the x-y plane is a 2-D subspace of the x-y-z (3-D cartesian) coordinate system
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| surface wave radr |
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| systolic array |
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| tails of interfering slots |
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| taoes |
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| time-frequency slices |
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| verilog |
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| visibility |
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| windowing | A taper applied to (typically) time domain signals to suppress endpoint effects; in particular, for spectral estimation.
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| shannon limit |
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| deconvolution | Example: determination of a true brightness distribution from a swept-beam measurement
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