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CDMA SPECTRAL-EFFICIENCY

CDMA spectral efficiency

System spectral efficiency of communication system

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

CDMA spectral efficiency

CDMA_spectral_efficiency

Spectral efficiency

Information rate that can be transmitted over a given bandwidth

Spectral efficiency (alternatively, spectrum efficiency or bandwidth efficiency) refers to the information rate that can be transmitted over a given bandwidth

Spectral efficiency

Spectral_efficiency

Code-division multiple access

Channel access method used by various radio communication technologies

of signature sequence used in CDMA system. CDMA spectral efficiency CDMA2000 Comparison of mobile phone standards cdmaOne Orthogonal variable spreading

Code-division multiple access

Code-division_multiple_access

CdmaOne

First CDMA-based digital cellular technology

also provides GSM) PN code Comparison of mobile phone standards CDMA spectral efficiency TDMA (time division multiple access), a mobile phone standard "TIA-95"

CdmaOne

Comparison of mobile phone standards

theory, CDMA, TDMA and FDMA have exactly the same spectral efficiency but practically, each has its own challenges – power control in the case of CDMA, timing

Comparison of mobile phone standards

Comparison_of_mobile_phone_standards

UMTS

Third generation mobile cellular system

wideband code-division multiple access (W-CDMA) radio access technology to offer greater spectral efficiency and bandwidth to mobile network operators

UMTS

Radio resource management

precoding are other examples for inter-cell radio resource management. CDMA spectral efficiency Cellular traffic Electromagnetic interference control IEEE 802

Radio resource management

Radio_resource_management

List of wireless network protocols

technology is determined by a number of constraints, including the spectral efficiency of the technology, the cell sizes used, and the amount of spectrum

List of wireless network protocols

List_of_wireless_network_protocols

Dynamic single-frequency networks

the spectral efficiency in bit/s/Hz/base station transmitter in comparison to a non-macrodiversity communication scheme. DSFN resembles the CDMA downlink

Dynamic single-frequency networks

Dynamic_single-frequency_networks

Multiuser detection

unavoidable in modern spectrally efficient wireless systems: even when using orthogonal multiplexing systems such as TDMA, synchronous CDMA or OFDMA, multiuser

Multiuser detection

Multiuser_detection

Eb/N0

Normalized signal-to-noise ratio measure

signal-to-noise ratio (SNR) in that bandwidth divided by the "gross" link spectral efficiency in (bit/s)/Hz, where the bits in this context again refer to user

Eb/N0

Cellular traffic

Telecommunications concept

include: quality of service targets, traffic capacity and cell size, spectral efficiency and sectorization, traffic capacity versus coverage, and channel

Cellular traffic

Cellular_traffic

Signal modulation

Process of varying one or more properties of a periodic waveform

(QPSK), used in Wi-Fi, Bluetooth, and cellular networks. Offers good spectral efficiency and robustness against interference. Quadrature Amplitude Modulation

Signal modulation

Signal_modulation

Orthogonal frequency-division multiplexing

Method of encoding digital data on multiple carrier frequencies

OFDMA for high efficiency and simultaneous communication. In multi-carrier code-division multiple access (MC-CDMA), also known as OFDM-CDMA, OFDM is combined

Orthogonal frequency-division multiplexing

Orthogonal_frequency-division_multiplexing

Fourth-generation mobile telecommunications standard

Similarly, MC-CDMA is in the proposal for the IEEE 802.20 standard. These access schemes offer the same efficiencies as older technologies like CDMA. Apart from

Third-generation mobile telecommunications standard

the second generation (2G) and associated technologies, such as GSM and cdmaOne, particularly in terms of data transfer speeds and mobile internet capabilities

LTE (telecommunication)

Mobile broadband communication standard

both HTC and Samsung. Initially, CDMA operators planned to upgrade to rival standards called UMB and WiMAX, but major CDMA operators (such as Verizon, Sprint

LTE (telecommunication)

LTE_(telecommunication)

MIMO-OFDM

Air interface for 4G and 5G broadband wireless communications

mobile broadband network standards because it achieves the greatest spectral efficiency and, therefore, delivers the highest capacity and data throughput

MIMO-OFDM

Orthogonal frequency-division multiple access

Multi-user version of OFDM digital modulation

interference, and makes it possible to achieve even better system spectral efficiency. Different numbers of sub-carriers can be assigned to different users

Orthogonal frequency-division multiple access

Orthogonal_frequency-division_multiple_access

Non-orthogonal frequency-division multiplexing

Method of encoding digital data on multiple carrier frequencies

subcarrier frequency arrangement provides several advantages: higher spectral efficiency, which allows to reduce the frequency band occupied by the signal

Non-orthogonal frequency-division multiplexing

Non-orthogonal_frequency-division_multiplexing

IMT Advanced

ITU requirements for 4G mobile telecommunications

Scalable channel bandwidth 5–20 MHz, optionally up to 40 MHz Peak link spectral efficiency of 15 bit/s/Hz in the downlink and 6.75 bit/s/Hz in the uplink (meaning

IMT Advanced

IMT_Advanced

Shlomo Rakib

Israeli electrical engineer

Rakib served as the company's president and CTOs. Rakib invented Terayon's S-CDMA technology, which is a component of the DOCSIS 2.0 cable data specification

Shlomo Rakib

Shlomo_Rakib

Single-carrier FDMA

Frequency-division multiple access scheme

precoded OFDMA (LP-OFDMA). Like other multiple access schemes (TDMA, FDMA, CDMA, OFDMA), it deals with the assignment of multiple users to a shared communication

Single-carrier FDMA

Single-carrier_FDMA

Symbol rate

Rate of modulation of a digital signal

to send a given quantity of data over a limited bandwidth. A high spectral efficiency in (bit/s)/Hz can be achieved; i.e., a high bit rate in bit/s although

Symbol rate

Symbol_rate

Air interface

Radio communication link

multiplexing combine frequency- and time-division approaches like OFDM or CDMA. In cellular telephone communications, the air interface is the radio-frequency

Air interface

Air_interface

E-UTRA

3GPP interface

comparison, UMTS uses fixed size 5 MHz chunks of spectrum. Increased spectral efficiency at 2–5 times more than in 3GPP (HSPA) release 6 Support of cell sizes

E-UTRA

Carrier recovery

System in electronic signal processing

demodulation. For a quiet carrier or a signal containing a dominant carrier spectral line, carrier recovery can be accomplished with a simple band-pass filter

Carrier recovery

Carrier_recovery

Carrier interferometry

support multiple users at the same time over the same frequency band. Like MC-CDMA, CI-OFDM spreads each data symbol in the frequency domain. That is, each

Carrier interferometry

Carrier_interferometry

Speech coding

Lossy audio compression applied to human speech

features Narrowband audio coding LPC FNBDT for military applications SMV for CDMA networks Full Rate, Half Rate, EFR and AMR for GSM networks G.723.1, G.728

Speech coding

Speech_coding

DOCSIS

Standard for computer networking over a cable television system

support 128-QAM with trellis coded modulation in S-CDMA mode (with an effective spectral efficiency equivalent to that of 64-QAM). DOCSIS 3.1 supports

DOCSIS

MIMO

Use of multiple antennas in radio

recent technology is holographic MIMO to realize high energy and spectral efficiency with very high spatial resolution. Holographic MIMO is a key conceptual

MIMO

Digital radio

Use of digital technology to transmit or receive across the radio spectrum

without self-interference problems, further improving the system spectral efficiency. While digital broadcasting offers many potential benefits, its introduction

Digital radio

Digital_radio

Electromagnetic interference

Disturbance in an electrical circuit due to external sources of radio waves

include: Solar activity Continuously operating spark gaps such as arc welders CDMA (spread-spectrum) mobile telephony An electromagnetic pulse (EMP), sometimes

Electromagnetic interference

Electromagnetic_interference

IEEE Eric E. Sumner award

theory, in particular on multi-element antenna technology for high spectral-efficiency communications. 2003 - Co-Recipients: Werner Bux, manager, Dept of

IEEE Eric E. Sumner award

IEEE_Eric_E._Sumner_award

Cooperative MIMO

increased diversity gain using relays, but at the cost of poorer spectral efficiency. However, neither of these techniques exploits interference for spatial

Cooperative MIMO

Cooperative_MIMO

WiMAX

Wireless broadband standard

a replacement candidate for cellular phone technologies such as GSM and CDMA, or can be used as an overlay to increase capacity. Fixed WiMAX is also considered

WiMAX

Bell Labs

Research and scientific development company

of one terabit per second by improving transmission capacity and spectral efficiency in an optical communications field trial with a new modulation technique

Bell Labs

Bell_Labs

Stochastic geometry models of wireless networks

just a first approach which allows one to characterize only the spectral efficiency (or information rate) of the network. In other words, this approach

Stochastic geometry models of wireless networks

Stochastic_geometry_models_of_wireless_networks

GPS signals

Signals broadcast by GPS satellites

stream is split into two, half-symbol-rate bit streams to improve spectral efficiency, the in-phase and quadrature components of GPS signals are modulated

GPS signals

GPS_signals

History of smart antennas

deliver incremental gains in spectral efficiency. 4G MIMO exploits natural multipath propagation to multiply spectral efficiency. Researchers studying the

History of smart antennas

History_of_smart_antennas