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Free Installation. Hover to zoom. Be the first to review. I agree to the. Terms and Conditions. How It Works? IMEI Number. Exchange Discount Summary. Exchange Discount -Rs. Final Price Rs. Apply Exchange. The tendency towards more mobility and flexibility favors wireless networks for future broadband services. This book proposes novel transmission techniques that achieve multi-path mitigation, through orthogonal frequency-domain processing, in combination with a high bandwidth efficiency, through space division multiple access SDMA.
Under certain conditions, SM offers linear increase in spectrum efficiency with the number of antennas. Smart phone Smart phone is a wireless phone with text and Internet capabilities. Smart phones can handle wireless phone calls, hold addresses and take voice mail and can also access information on the Internet and send and receive e-mail and fax transmissions. The transmission usually is done in C-band to 1. The SMLC manages the overall coordination and scheduling of resources required for the location of a mobile unit.
SMPP is often used to allow third parties e.
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The message length is bytes. Larger contents known as long SMS or concatenated SMS can be sent segmentedly over multiple messages, in which case each message will start with a user data header UDH containing segmentation information. It is a measure of transmission quality.
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The ratio of good data signal to bad noise on a line is expressed in decibels dB. SHO: Soft Handoff Soft Handoff SHO refers to two base stations -- one in the cell site where the phone is located and the other in the cell site to which the conversation is being passed, but both are held on the call until the handoff is completed. The first cell site does not cut off the conversation until it receives information that the second is maintaining the call. Software Access Point Software Access Point is a wireless-enabled computer running special software that enables it to act exactly like an wireless access point.
Space diversity Space diversity is a diversity technique widely used in wireless systems since the very beginning. It consists of two receiving antennas physically spatially separated to provide de-correlated receiving signals.
Wireless Technology Terms Glossary and Dictionary [S-Z] | Anritsu Asia Pacific
Spectrum Spectrum refers to a continuous range of frequency for electromagnetic waves. Spectrum Allocation Spectrum Allocation refers to that government designation of a range of frequencies for a category of use or uses. Allocation, typically accomplished in years-long FCC proceedings, tracks new technology development. However, the FCC can shift existing allocations to accommodate changes in spectrum demand. As an example, some UHF television channels were recently reallocated to public safety. Spectrum Assignment Spectrum Assignment refers to the government authorization for use of specific frequencies or frequency pairs within a given allocation, usually at stated geographic location s.
Mobile communications authorizations are typically granted to private users, such as oil companies, or to common carriers, such as cellular and paging operators. Historically, the over-the-air spectrum has been assigned to many purposes other than that of carrying TV signals. This has resulted in an inadequate supply of spectrum to serve the needs of viewers. Cable can reuse spectrum that is sealed in its aluminum tubes. Spectrum spreading Spectrum spreading is the process of increasing the occupied spectrum of a signal well beyond the needed to transmit the information.
Speech coding Speech coding is an electronic process of sampling and digitizing a voice signal. Spread spectrum Spread spectrum is a form of wireless communications in which a signal's frequency is deliberately varied. This increases bandwidth and lessens the chances of interruption or interception of the transmitted signal.
SR: Spread Rate Spread rate SR , also known as the chip rate, is the rate of the digital code used to spread the information. The spreading rate is typically at least times the information rate. The key functons of the Serving RNC: terminates the mobile link layer communications, terminates the IU, and exerts Admission Control over new mobiles or services attempting to use the Core Network over its IU interface. SS: Subscriber Station A Subscriber Station SS refers to a generalized equipment set providing connectivity between subscriber equipment and a Base Station in the mobile wireless network.
SSB: Single-sideband modulation Single-sideband modulation SSB is a refinement of the technique of amplitude modulation designed to be more efficient in its use of electrical power and bandwidth. It is closely related to vestigial sideband modulation VSB. To produce an SSB signal, a filter removes one of the sidebands.
Most often, the carrier is reduced suppressed or removed entirely.
US8483128B2 - Filling the space-time channels in SDMA - Google Patents
Assuming both sidebands are symmetric, no information is lost in the process. What remains still contains the entire information content of the AM signal, using substantially less bandwidth and power, but cannot now be demodulated by a simple envelope detector. It uses an encryption key installed in the phone at the time of activation and known to the system through an entry in the HLR, that protects signalling and identity information.
It can also be used to establish a voice privacy key.
SSI: Service Set Identifier A Service Set Identifier SSI is a sequence of characters unique to a specific network or network segment that's used by the network and all attached devices to identify themselves and allow devices to connect to the correct network when more than one independent networks are operating in nearby areas. A network administrator often uses a public SSID, that is set on the access point and broadcast to all wireless devices in range.
Some newer wireless access points disable the automatic SSID broadcast feature in an attempt to improve network security. To implement STAP requires sampling the radar returns at each element of an antenna array, over a dwell encompassing several pulse repetition intervals. STBC: Space Time Block Coding Space time block coding STBC is a technique used in wireless communications to transmit multiple copies of a data stream across a number of antennas and to exploit the various received versions of the data to improve the reliability of data-transfer.
The fact that transmitted data must traverse a potentially difficult environment with scattering, reflection, refraction and so on and, as well as, be corrupted by thermal noise in the receiver means that some of the received copies of the data will be "better" than others.
Space Division Multiple Access for Wireless Local Area Networks
This redundancy results in a higher chance of being able to use one or more of the received copies of the data to correctly decode the received signal. In fact, STBC combines all the copies of the received signals in an optimal way to extract as much information from each of them as possible. STCs rely on transmitting multiple, redundant copies of a data stream to the receiver in the hope that at least some of them may survive the physical path between transmission and reception in a good enough state to allow reliable decoding.
This scheme transmits multiple, redundant copies of a trellis or convolutional code distributed over time and a number of antennas "space". These multiple, "diverse" copies of the data are used by the receiver to attempt to reconstruct the actual transmitted data. For a STC to be used, there must necessarily be multiple transmit antennas, but only a single receive antennas is required; nevertheless multiple receive antennas are often used since the performance of the system is improved by so doing.
Sub Network Sub Network is a way of denoting a group of network layers that appear as one to a higher protocol layer. Supplementary services Supplementary services is a group of network layer protocol functions that provide call independent functions for mobile phones. These include: call forwarding, follow-me, advice of charge, reverse charging, etc. Symbian Symbian is a software licensing company that develops and supplies the advanced, open, standard operating system -- Symbian OS -- for data-enabled mobile phones.
SyncML is transport, data type and platform independent.
The TAP protocol may be utilized to forward binary data to RF-linked computers if input is formatted and processed. In most second generation systems, the traffic channel can be either full or half rate. It combines the choice of a modulation scheme with that of a convolutional code together for the purpose of gaining noise immunity over encoded transmission without expanding the signal bandwidth or increasing the transmitted power. It also controls the device mobility management procedures. It can be used to create a three-in-one phone:.
It is developed and used primarily in China, combining time division multiplexing with CDMA techniques.
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In a Time Division Duplex system, a common carrier is shared between the uplink and downlink, the resource being switched in time. Users are allocated one or more timeslots for uplink and downlink transmission. So one frequency can support multiple, simultaneous data channels, using bandwidth more efficiently than earlier technologies. Together, these protocols define the flow of messages from input devices through several processing steps until the entire message is received by an RF-linked computer.
This proposed standard is 1. The transmit station used can be determined by either a fixed pattern or based on a QoS measurement made at the mobile. Telematics Telematics means the integration of wireless communications, vehicle monitoring systems and location devices. Time dispersion Time dispersion is a manifestation of multipath propagation that stretches the signal in time so that the duration of the received signal is greater than the transmitted signal.
Time diversity Time diversity is the technique used by CDMA systems to overcome the effects of multipath fading. Through the use of a rake receiver, individual elements or fingers can be offset in time to account for different arrival times of multipath signals. TinyOS TinyOS is an open source component-based operating system and platform targeting wireless sensor networks. TinyOS is an embedded operating system, written in NesC programming language, as a set of cooperating tasks and processes.