Get Here about CDMA technology and How CDMA Works, CDMA Solution and CDMA RF Optimization.
CDMA2000 encompasses a family of 3G wireless communication standards. CDMA2000 1xRTT offers data rates of up to 144 kbps, supporting voice and data. CDMA2000 1xEV-DO provides higher data rates, up to 3.1 Mbps, primarily for data services. CDMA2000 1xEV-DV combines voice and data, also offering high-speed connectivity. CDMA2000 3X enhances 1xRTT with data rates up … Read more
1G, the first generation, introduced analog cellular communication in the early 1980s. 2G followed, bringing digital voice calls and the birth of text messaging in the late 1980s and early 1990s. The 3G era, starting in the early 2000s, ushered in faster data speeds and mobile internet access. By 2010, 4G networks arrived, offering even … Read more
CDMA2000, a widely used wireless communication technology, stands out for its efficient spectrum utilization through Code Division Multiple Access, offering high data rates, excellent call quality, and support for multimedia applications. It ensures smooth handovers, incorporates security measures, and is often backward compatible, allowing for global acceptance and interoperability with other networks. What are the … Read more
Message Transmission Mode MS measures the frame quality and informs the base station to the result i.e. whether it is in the threshold or periodical mode. Base station determines whether to change the forward transmitting power or not. In IS-95 system, the forward power control is slow but in CDMA2000 system it is fast. Forward … Read more
What is Work of Paging Channel in CDMA?The Paging Channel in CDMA (Code Division Multiple Access) serves a crucial role in the efficient functioning of the communication system. As a dedicated control channel, the Paging Channel is responsible for transmitting important information, such as incoming calls and system messages, to mobile devices within a CDMA … Read more
The mobile station continuously searches for Pilots to detect the presence of other CDMA signals that have the same carrier frequency and measures the strength (received Ec/Nt) of the pilots. When the mobile station detects a Pilot of sufficient strength that is not associated with the serving cell/sector, it sends a message to the serving … Read more
There Are Three Codes in CDMA PN Long Code,PN Short Code & Walsh Code. PN Long Code The Long Code is a PN sequence that is 242 – 1 bits (chips) long. The long code is used to encrypt user information. Both the base station and the mobile unit have knowledge of this sequence at … Read more
In an actual application, the system implements the modulation in this way: as shown above, I and Q channel sequences in the figure represent two channels of cyclic PN short code sequences. The cyclic period of each channel of PN short codes is 215. For different sectors, there are different starting locations of I … Read more
The original release of the EIA/TIA-95-B standard defined the protocol messages and formats to be used in the CDMA system. This release is know as Revision 0 of the IS-95 standard. Since the release of Revision 0, a newer standard has been released for cellular CDMA that is called the Revision A standard of IS-95. … Read more
The radio waves are distributed in 3Hz ~ 3000GHz. This spectrum is divided into 12 bands, as shown in the above table. The frequencies in each specific band present unique propagation features: The lower the frequency is, the lower the propagation loss will be, the farther the coverage distance will be, and the stronger the … Read more