11 Facts About Synchronous CDMA

Synchronous CDMA is an example of multiple access, where several transmitters can send information simultaneously over a single communication channel.

Space-based communication applications, Synchronous CDMA has been used for many decades due to the large path loss and Doppler shift caused by satellite motion.

Synchronous CDMA is often used with binary phase-shift keying in its simplest form, but can be combined with any modulation scheme like quadrature amplitude modulation or orthogonal frequency-division multiplexing, which typically makes it very robust and efficient .

The technology of Synchronous CDMA was used in 1957, when the young military radio engineer Leonid Kupriyanovich in Moscow made an experimental model of a wearable automatic mobile phone, called LK-1 by him, with a base station.

Each user in a Synchronous CDMA system uses a different code to modulate their signal.

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Synchronous CDMA is analogous to the last example where people speaking the same language can understand each other, but other languages are perceived as noise and rejected.

In general, CDMA belongs to two basic categories: synchronous and asynchronous .

Each user in synchronous CDMA uses a code orthogonal to the others' codes to modulate their signal.

In other words, asynchronous CDMA is ideally suited to a mobile network where large numbers of transmitters each generate a relatively small amount of traffic at irregular intervals.

Novel collaborative multi-user transmission and detection scheme called collaborative Synchronous CDMA has been investigated for the uplink that exploits the differences between users' fading channel signatures to increase the user capacity well beyond the spreading length in the MAI-limited environment.

An enhanced Synchronous CDMA version known as interleave-division multiple access uses the orthogonal interleaving as the only means of user separation in place of signature sequence used in Synchronous CDMA system.