Terms : Hide Images
| 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 |
