CDMA 2000 - Definition, Features, Standards and Protocols
2024年3月7日 · Compared to WCDMA, CDMA2000 uses a smaller bandwidth—typically 1.25 MHz—and a fixed spreading factor (SF) of 128. Moreover, CDMA2000 employs a chip rate of 1.2288 Mcps, which is less than 3.84 Mcps used by WCDMA. Only frequency division duplex (FDD) mode is supported by CDMA2000, although several carriers can be …
CDMA2000 - Wikipedia
CDMA2000 (also known as C2K or IMT Multi‑Carrier (IMT‑MC)) is a family of 3G [1] mobile technology standards for sending voice, data, and signaling data between mobile phones and cell sites. It is developed by 3GPP2 as a backwards-compatible successor to second-generation cdmaOne (IS-95) set of standards and used especially in North America ...
CDMA2000 - 百度百科
CDMA2000 是一个 3G 移动通讯标准， 国际电信联盟 ITU 的 IMT-2000 标准认可的无线电接口，也是 2G cdmaOne 标准的延伸，不需要新的频段分配，可以稳定运行在现有PCS频段。根本的信令标准是IS-2000。
CDMA2000 - 维基百科，自由的百科全书
CDMA2000 1xRTT （RTT－无线电传输技术）是CDMA2000一个基础层，支持最高153.6kbps数据速率，尽管获得3G技术的官方资格，但是通常被认为是 2.5G 或者 2.75G 技术，因为它的速率只是其他3G技术几分之一。 另外较之之前的CDMA网络，它拥有双倍的语音容量。 CDMA2000 1xEV （Evolution－发展）是CDMA2000 1x附加了 高数据速率 （HDR）能力。 1xEV一般分成2个阶段：
Code-division multiple access - Wikipedia
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).
cdma2000 specification and information page - UMTS World
Cdma2000 1x EV-DO and cdma2000 3x are an ITU-approved, IMT-2000 (3G) standards. Cdma2000 3x is part of what the ITU has termed IMT-2000 CDMA MC (Multi Carrier). It uses less that 5 MHz spectrum (3x 1.25 MHz channels) to give speeds of over 2 Mbps. Cdma2000 1x with lower data speed is considered to be a 2.5G technology. Cdma2000 Technical summary
Near-far effect: BS receiver captured by nearby MS • Important in cdma systems because of frequency reuse of N=1 • The goal is to maintain equal received power at the base station from each mobile • Affects traffic channels (not pilot signal)
5.16: 3G, Third Generation- Code Division Multiple Access …
2021年3月22日 · The CDMA2000 and WCDMA paths become the single LTE path beyond 3G. The CDMA2000 (the IS-2000 standard) path builds on the original CDMA system defined by the IS-95 standard and commonly known as CDMAOne (the IS-95 standard).
SR3: An SR3 cdma2000 signal has a rate of 3.6864 Mcps (3 x 1.2288 Mcps) and occu-pies three times the bandwidth of cdmaOne. Originally, the SR3 system appeared to be viable. Upon further investigation the SR3 cdma2000 system was determined to not be viable and is no longer receiving any commercial attention at this time. Therefore, we
What is CDMA (Code-Division Multiple Access)? - TechTarget
CDMA is compatible with other cellular technologies; this enables nationwide roaming. The original CDMA standard, also known as CDMA One, offers a transmission speed of only up to 14.4 kilobits per second in its single channel form and up to 115 Kbps in an eight-channel form. CDMA2000 and Wideband CDMA (W-CDMA) deliver data many times faster.