8728022852 | amplitude | The height from the top peak to the bottom peak of a signal's waveform; also
known as the peak-to-peak amplitude. | | 0 |
8728022853 | band | A contiguous range of frequencies. | | 1 |
8728022854 | bandwidth | The range of frequencies used by a single channel or a single RF signal. | | 2 |
8728025672 | Barker code | An 11-bit sequence of encoded bits that represents a single data bit. | | 3 |
8728025673 | carrier signal | The basic, steady RF signal that is used to carry other useful information | | 4 |
8728029489 | channel | An arbitrary index that points to a specific frequency within a band. | | 5 |
8728029490 | chip | A bit produced by a coder | | 6 |
8728031773 | CCK (stands for) | Complementary Code Keying (acronym) | | 7 |
8728031774 | dB decibel | A logarithmic function that compares one absolute measurement to another | | 8 |
8728035762 | dBd | The gain of an antenna, measured in dB, as compared to a simple dipole antenna. | | 9 |
8728035763 | dBi | The gain of an antenna, measured in dB, as compared to an isotropic reference antenna. | | 10 |
8728035764 | dBm | The power level of a signal measured in dB, as compared to a reference signal power of
1 milliwatt. | | 11 |
8728039817 | demodulation | The receiver's process of interpreting changes in the carrier signal to recover
the original information being sent. | | 12 |
8728039818 | DBPSK stands for | differential binary phase shift keying | | 13 |
8728044048 | DQPSK stands for | differential quadrature phase shift keying | | 14 |
8728044049 | DSSS stands for | direct sequence spread spectrum | | 15 |
8728049169 | EIRP stands for | effective isotropic radiated power | | 16 |
8728052571 | frequency | The number of times a signal makes one complete up and down cycle in 1
second. | | 17 |
8728052572 | FHSS stands for | frequency hopping spread spectrum | | 18 |
8728052573 | Hz hertz | A unit of frequency equaling one cycle per second. | | 19 |
8728054934 | in phase | The condition when the cycles of two identical signals are in sync with each other. | | 20 |
8728054935 | isotropic antenna | An ideal, theoretical antenna that radiates RF equally in every direction. | | 21 |
8728057592 | link budget | The cumulative sum of gains and losses measured in dB over the complete RF
signal path; a transmitter's power level must overcome the link budget so that the signal can
reach a receiver effectively. | | 22 |
8728057593 | modulation | The transmitter's process of altering the carrier signal according to some other
information source. | | 23 |
8728060477 | narrowband | RF signals that use a very narrow range of frequencies | | 24 |
8728060480 | noise floor | The average power level of noise measured at a specific frequency. | | 25 |
8728062949 | OFDM stands for | orthogonal frequency-division multiplexing | | 26 |
8728062950 | out of phase | The condition when the cycles of one signal are shifted in time in relation to
another signal. | | 27 |
8728065511 | phase | A measure of shift in time relative to the start of a cycle; ranges between 0 and 360
degrees. | | 28 |
8728065512 | QAM stands for | quadrature amplitude modulation | | 29 |
8728065513 | RF radio frequency | The portion of the frequency spectrum between 3 kHz and 300 GHz. | | 30 |
8728067478 | RSSI stands for | received signal strength indicator | | 31 |
8728067479 | sensitivity level | The RSSI threshold (in dBm) that divides unintelligible RF signals from useful
ones | | 32 |
8728070146 | SNR signal-to-noise ratio | A measure of received signal quality, calculated as the difference
between the signal's RSSI and the noise floor. A higher SNR is preferred. | | 33 |
8728070147 | spread spectrum | RF signals that spread the information being sent over a wide range of
frequencies. | | 34 |
8728070220 | symbol | A complete group of encoded chips that represents a data bit. | | 35 |
8728073530 | wavelength | The physical distance that a wave travels over one complete cycle. | | 36 |
8728112601 | coder | A function that converts data bits into multiple encoded bits before transmission, to
provide resilience against noise and interference. | | 37 |
8728125741 | CCK Deffinition | An encoding method that takes either 4 or 8 data
bits at a time to create a 6-bit or 8-bit symbol, respectively. The symbols are fed into DQPSK
to modulate the carrier signal. | | 38 |
8728154827 | DBPSK Deffinition | A modulation method that takes 1 bit of
encoded data and changes the phase of the carrier signal in one of two ways. | | 39 |
8728169651 | DQPSK Deffinition | A modulation method that takes 2
bits of encoded data and changes the phase of the carrier signal in one of four ways | | 40 |
8728169652 | DSSS Deffinition | A wireless LAN method where a transmitter
uses a single fixed, wide channel to send data. | | 41 |
8728172333 | EIRP Deffinition | The resulting signal power level, measured in
dBm, of the combination of a transmitter, cable, and an antenna, as measured at the antenna. | | 42 |
8728189444 | FHSS Deffinition | A wireless LAN method where a transmitter
"hops" between frequencies all across a band. | | 43 |
8728206218 | OFDM deffinition | A data transmission method that
sends data bits in parallel over multiple frequencies within a single 20-MHz-wide channel. Each
frequency represents a single subcarrier. | | 44 |
8728225594 | QAM Deffinition | A modulation method that combines QPSK
phase shifting with multiple amplitude levels to produce a greater number of unique changes
to the carrier signal. The number preceding the QAM name designates how many carrier signal
changes are possible. | | 45 |
8728234367 | RSSI Definition | The measure of signal strength (in dBm) as seen
by the receiver. RSSI is normally negative (0 to -100) because the received signal is always a
degraded form of the original signal that was sent. | | 46 |