CDMA - translation to Αγγλικά
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CDMA - translation to Αγγλικά

CHANNEL ACCESS METHOD FOR RADIO COMMUNICATION, ALLOWING MANY TRANSMITTERS TO SEND INFORMATION OVER ONE CHANNEL USING SPREAD SPECTRUM TECHNOLOGY AND A SPECIAL CODING SCHEME; USED IN GPS, CDMAONE, CDMA2000, UMTS, ETC.
CDMA; Code-division; Code-Division Multiple Access; Code division multiplexing; Cdma; Synchronous Code-Division Multiple Access; SCDMA; Synchronous Code Division Multiple Access'; Code-division multiplexing; Code division multiplex; IS683A; S-CDMA; S-cdma; Synchronous CDMA; Code division; Code division multiple access; Collaborative CDMA; Code Division Multiple Access; Synchronous Code Division Multiple Access
  • A CDMA2000 [[mobile phone]]
  • Generation of a CDMA signal

CDMA         

общая лексика

Code Division Multiple Access, spread spectrum

многостанционный доступ с кодовым разделением каналов, МДКР

один из двух стандартов для цифровых сетей сотовой связи в США. Использует диапазоны частот 800 и 1900 МГц и так называемые шумоподобные сигналы (сигналы с расширенным спектром). Развитием стандарта занимается консорциум CDMA Development Group (CDG, www.cdg.org)

Смотрите также

FDMA; IS-95; multiplexing; TDMA

CDMA         
Code Division Multiple Access
многостанционный доступ с кодовым разделением каналов. Метод, позволяющий группе абонентов обслуживаться одновременно в общей полосе частот. Разделение каналов осуществляется на основе кодирования и декодирования последовательностей радиосигналов, поступающих в канал от каждого абонента.
CDMA (IS-95) - digital mobile radio communication network CDMA standard with IS-95 for 800 MHz or J-STD-008 for 1900 MHz
стандарт CDMA с IS-95 для 800 МГц или J-STD-008 для 1900 МГц
CDMA         
сокр. от Code Division Multiple Access множественный доступ с кодовым разделением (каналов)

Ορισμός

CDMA
Code Division Multiple Access (Reference: telecommunication, mobile-systems)

Βικιπαίδεια

Code-division multiple access

Code-division multiple access (CDMA) is a channel access method used by various radio communication technologies. CDMA is an example of multiple access, where several transmitters can send information simultaneously over a single communication channel. This allows several users to share a band of frequencies (see bandwidth). To permit this without undue interference between the users, CDMA employs spread spectrum technology and a special coding scheme (where each transmitter is assigned a code).

CDMA optimizes the use of available bandwidth as it transmits over the entire frequency range and does not limit the user's frequency range.

It is used as the access method in many mobile phone standards. IS-95, also called "cdmaOne", and its 3G evolution CDMA2000, are often simply referred to as "CDMA", but UMTS, the 3G standard used by GSM carriers, also uses "wideband CDMA", or W-CDMA, as well as TD-CDMA and TD-SCDMA, as its radio technologies.

It can be also used as a channel or medium access technology, like ALOHA for example or as a permanent pilot/signalling channel to allow users to synchronize their local oscillators to a common system frequency, thereby also estimating the channel parameters permanently.

In these schemes, the message is modulated on a longer spreading sequence, consisting of several chips (0es and 1es). Due to their very advantageous auto- and crosscorrelation characteristics, these spreading sequences have also been used for radar applications for many decades, where they are called Barker codes (with a very short sequence length of typically 8 to 32).

For space-based communication applications, CDMA has been used for many decades due to the large path loss and Doppler shift caused by satellite motion. CDMA is often used with binary phase-shift keying (BPSK) in its simplest form, but can be combined with any modulation scheme like (in advanced cases) quadrature amplitude modulation (QAM) or orthogonal frequency-division multiplexing (OFDM), which typically makes it very robust and efficient (and equipping them with accurate ranging capabilities, which is difficult without CDMA). Other schemes use subcarriers based on binary offset carrier modulation (BOC modulation), which is inspired by Manchester codes and enable a larger gap between the virtual center frequency and the subcarriers, which is not the case for OFDM subcarriers. Many carriers (such as AT&T and Verizon) shut down CDMA networks in 2022, rendering CDMA handsets unusable for calls, even to 911.

Παραδείγματα από το σώμα κειμένου για CDMA
1. Qualcomm‘s patents for CDMA (Code Division Multiple Access) technology are reaping it billions of dollars in royalties and its W–CDMA and CDMA 2000 technology have been adopted by 3G operators around the world.
2. The world‘s two 2G mobile standards are GSM and CDMA.
3. "I would not bet on North America continuing with CDMA." CDMA (code division multiple access) technology was invented by San Diego–based Qualcomm and the company delivers virtually all chips needed in CDMA networks and mobile phones used by some 500 million consumers mostly in the Americas and Asia.
4. South Korea‘s LG Electronics Inc. has the largest market share in the CDMA handset segment.
5. A GSM caller cannot connect over a CDMA network and vice versa.
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