2G spectrum scam The 2G spectrum scam was a scam involving politicians and government officials in India illegally undercharging mobile telephony companies for frequency allocation licenses, which they would then use to create 2G spectrum subscriptions for cell phones.
3G MIMO 3G MIMO describes MIMO techniques which have been considered as 3G standard techniques.
Antenna diversity Antenna diversity, also known as space diversity, is any one of several wireless diversity schemes that uses two or more antennas to improve the quality and reliability of a wireless link.
Bandplan A bandplan or band plan is a plan for using a particular band of radio frequencies, that are a portion of the electromagnetic spectrum.
Carrier-to-noise-density ratio Carrier-to-moise-density ratio or C/No (or C/kT) means the ratio of carrier or signal power to white-noise spectral density.
CDMA spectral efficiency CDMA spectral efficiency refers to the system spectral efficiency in bit/s/Hz/site or Erlang/MHz/site that can be achieved in a certain CDMA based wireless communication system.
Cell breathing (telephony) In CDMA-based mobile telephone systems, cell breathing is a mechanism which allows overloaded cells to offload subscriber traffic to neighbouring cells by changing the geographic size of their s...
Cellular frequencies The cellular frequencies are the sets of frequency ranges within the ultra high frequency band that have been allocated for cellular phone use.
Cellular network A cellular network or mobile network is a wireless network distributed over land areas called cells, each served by at least one fixed-location transceiver, known as a cell site or base s...
Cellular traffic This article discusses the mobile cellular network aspect of teletraffic measurements.
Channel allocation schemes In radio resource management for wireless and cellular network, channel allocation schemes are required to allocate bandwidth and communication channels to base stations, access points and termi...
Channel state information In wireless communications, channel state information (CSI) refers to known channel properties of a communication link.
Co-channel interference Co-channel interference or CCI is crosstalk from two different radio transmitters using the same frequency.
Cognitive radio A cognitive radio is an intelligent radio that can be programmed and configured dynamically.
Cooperative diversity Cooperative diversity is a cooperative multiple antenna technique for improving or maximising total network channel capacities for any given set of bandwidths which exploits user diversity by de...
Cyclic delay diversity Cyclic Delay Diversity is a diversity scheme used in OFDM-based telecommunication systems, transforming spatial diversity into frequency diversity avoiding intersymbol interference.
Diversity Coding Diversity Coding is a particular technique for antenna diversity and is implemented by space-time coding.
Diversity coding Diversity coding is a particular technique for antenna diversity and is implemented by space–time coding.
Diversity combining Diversity combining is the technique applied to combine the multiple received signals of a diversity reception device into a single improved signal.
Diversity gain In wireless communications, diversity gain is the increase in signal-to-interference ratio due to some diversity scheme, or how much the transmission power can be reduced when a diversity scheme...
Diversity scheme In telecommunications, a diversity scheme refers to a method for improving the reliability of a message signal by using two or more communication channels with different characteristics.
Dynamic bandwidth allocation Dynamic bandwidth allocation is a technique by which traffic bandwidth in a shared telecommunications medium can be allocated on demand and fairly between different users of that bandwidth.
Dynamic Frequency Selection In radio resource management for wireless and cellular network, channel allocation schemes are required to allocate bandwidth and communication channels to base stations, access points and termi...
Fixed channel allocation In radio resource management for wireless and cellular network, channel allocation schemes are required to allocate bandwidth and communication channels to base stations, access points and termi...
Frequency allocation Use of radio frequency bands of the electromagnetic spectrum is regulated by governments in most countries, in a Spectrum management process known as frequency allocation or spectrum allocati...
Frequency-hopping spread spectrum Frequency-hopping spread spectrum (FHSS) is a method of transmitting radio signals by rapidly switching a carrier among many frequency channels, using a pseudorandom sequence known to both...
Handover In cellular telecommunications, the term handover or handoff refers to the process of transferring an ongoing call or data session from one channel connected to the core network to another...
Hierarchical modulation Hierarchical modulation, also called layered modulation, is one of the signal processing techniques for multiplexing and modulating multiple data streams into one single symbol stream, whe...
IEEE 802.11h-2003 IEEE 802.11h-2003, or just 802.11h, refers to the amendment added to the IEEE 802.11 standard for Spectrum and Transmit Power Management Extensions.
IEEE 802.11k-2008 IEEE 802.11k-2008 is an amendment to IEEE 802.11-2007 standard for radio resource management.
Indian 2G spectrum scam The 2G spectrum scam was a scam involving politicians and government officials in India illegally undercharging mobile telephony companies for frequency allocation licenses, which they would the...
Link adaptation Link adaptation, or adaptive modulation and coding (AMC), is a term used in wireless communications to denote the matching of the modulation, coding and other signal and protocol parameter...
Logic Trunked Radio Logic Trunked Radio (LTR) is a system developed in the late 1970s by the E. F. Johnson Company.
Macrodiversity In the field of wireless communication, macrodiversity is a kind of space diversity scheme using several receiver antennas and/or transmitter antennas for transferring the same signal.
Many antennas Many antennas is a smart antenna technique which overcomes the performance limitation of single user multiple-input multiple-output techniques.
Maximal-ratio combining In telecommunications, maximal-ratio combining is a method of diversity combining in which: (a) the signals from each channel are added together, (b) the gain of each channel is made proportiona...
Maximum throughput scheduling Maximum throughput scheduling is a procedure for scheduling data packets in a packet-switched best-effort communications network, typically a wireless network, in view to maximize the total thro...
MIMO In radio, multiple-input and multiple-output, or MIMO, is the use of multiple antennas at both the transmitter and receiver to improve communication performance.
Mobile ad hoc network A mobile ad hoc network (MANET) is a self-configuring infrastructureless network of mobile devices connected by wireless.
Multi-frequency network A multi-frequency network is a network in which multiple radio frequencies are used to transmit media content.
Multi-frequency time division multiple access MF-TDMA ("Multi-Frequency, Time Division Multiple Access") is the leading technology for dynamically sharing bandwidth resources in an over-the-air, two-way communications network.
Multi-user MIMO In radio, multi-user MIMO (MU-MIMO) is a set of advanced MIMO, multiple-input and multiple-output, technologies where the available antennas are spread over a multitude of independen...
Open spectrum Open spectrum (also known as free spectrum) is a movement to get the Federal Communications Commission to provide more unlicensed, radio frequency spectrum that is available for use by all.
Overlap zone An overlap zone, in radio frequency engineering, is a zone in which the signals from two or more radio stations, transmitting at the same frequency, can be received with comparable intensity.
Power control Power control, broadly speaking, is the intelligent selection of transmitter power output in a communication system to achieve good performance within the system.
Precoding Precoding is a generalization of beamforming to support multi-stream (or multi-layer) transmission in multi-antenna wireless communications.
Radio Link Protocol Radio Link Protocol is an automatic repeat request fragmentation protocol used over a wireless air interface.
Radio resource management Radio resource management (RRM) is the system level control of co-channel interference and other radio transmission characteristics in wireless communication systems, for example cellular networks, wireless networks and broadcasting systems.
Reconfigurability Reconfigurability denotes the Reconfigurable Computing capability of a system, so that its behavior can be changed by reconfiguration, i. e. by loading different configware code.
Rxqual RxQual is used in GSM and is a part of the Network Measurement Reports (NMR).
Signal-to-interference ratio The signal-to-interference ratio (S/I or SIR), also known as the carrier-to-interference ratio (C/I, CIR), is the quotient between the average received modulated carrier power ...
Single-frequency network A single-frequency network or SFN is a broadcast network where several transmitters simultaneously send the same signal over the same frequency channel.
Soft handover Soft handover or soft handoff refers to a feature used by the CDMA and WCDMA standards, where a cell phone is simultaneously connected to two or more cells (or cell sectors) during a call.
Software-defined radio A software-defined radio system, or SDR, is a radio communication system where components that have been typically implemented in hardware (e.g.
Space-time code A space–time code (STC) is a method employed to improve the reliability of data transmission in wireless communication systems using multiple transmit antennas.
Space–time code A space–time code (STC) is a method employed to improve the reliability of data transmission in wireless communication systems using multiple transmit antennas.
Spatial capacity Spatial capacity is an indicator of "data intensity" in a transmission medium.
Spatial multiplexing Spatial multiplexing is a transmission technique in MIMO wireless communication to transmit independent and separately encoded data signals, so-called streams, from each of the multiple tran...
Spectral efficiency Spectral efficiency, spectrum efficiency or bandwidth efficiency refers to the information rate that can be transmitted over a given bandwidth in a specific communication system.
Spectrum commons theory The Spectrum Commons theory states that the telecommunication radio spectrum should be directly managed by its users rather than regulated by governmental or private institutions.
Spread spectrum In telecommunication and radio communication, spread-spectrum techniques are methods by which a signal (e.g.
SURAN The Survivable Radio Network (SURAN) project was sponsored by DARPA in the 1980s to develop a set of mobile ad hoc network (MANET) radio-routers, then known as "packet radios".
Time diversity Time Diversity is used in digital communication systems to combat that the transmissions channel may suffer from error bursts due to time-varying channel conditions.
Transmit diversity Transmit diversity is radio communication using signals that originate from two or more independent sources that have been modulated with identical information-bearing signals and that may vary ...
Trunked radio system A trunked radio system is a complex type of computer-controlled two-way radio system that allows sharing of relatively few radio frequency channels among a large group of users.
Zero-forcing precoding In particular, Null-Steering is a method of beamforming for narrowband signals where we want to have a simple way of compensating delays of receiving signals from a specific source at different ...