Useful tips

What is CDMA and its application?

What is CDMA and its application?

Code Division Multiple Access (CDMA) is a sort of multiplexing that facilitates various signals to occupy a single transmission channel. It optimizes the use of available bandwidth. The technology is commonly used in ultra-high-frequency (UHF) cellular telephone systems, bands ranging between the 800-MHz and 1.9-GHz.

What is Code Division Duplexing?

Code-division duplexing (CDD) is an innovative solution that can eliminate all four kinds of interference: adjacent base-to-home mobile, adjacent mobile-to-home base, adjacent base-to-home base, and adjacent mobile-to-home mobile in cellular systems.

Which technique is used by code division multiplexing?

spread-spectrum technique
A multiplexing scheme, well known in the domain of wireless communications, makes use of the spread-spectrum technique. It is referred to as code-division multiplexing (CDM) because each channel is coded in such a way that its spectrum spreads over a much wider region than occupied by the original signal.

What are the main advantages of CDMA?

One of the main advantages of CDMA is that dropouts occur only when the phone is at least twice as far from the base station. Thus it is used in the rural areas where GSM cannot cover. Another advantage is its capacity; it has a very high spectral capacity that it can accommodate more users per MHz of bandwidth.

What is FDMA in mobile communication?

FDMA (frequency division multiple access) is the division of the frequency band allocated for wireless cellular telephone communication into 30 channels, each of which can carry a voice conversation or, with digital service, carry digital data. With FDMA, each channel can be assigned to only one user at a time.

What are the advantages of TDM?


  • Code utilisation of communication channel.
  • TDM circuitry is not very complex.
  • Communication link of low capacity is used.
  • The problem of crosstalk is not severe.
  • Full available channel bandwidth can be utilized for each channel.
  • intermodulation distortion is absent.

What are the advantages of code division multiplexing?

There are some important advantages of CDMA (code division multiple access) are given below,

  • The CDMA does not require any synchronization.
  • It has more number of users can share the same bandwidth.
  • It is well-matched with other cellular technologies.
  • Due to codeword allocated to each user, interference is reduced.

What do you need to know about code division multiplexing?

Code Division Multiplexing 1 Code Division Multiple Access. When CDM is used to allow multiple signals from multiple users to share a common communication channel, the technology is called Code Division Multiple Access (CDMA). 2 Concept. Each communicating station is assigned a unique code. 3 Orthogonal Sequences.

What are the applications of code division multiple access?

There are some important applications of CDMA (code division multiple access) are given below, It is used in military and some commercial application. It is used in mobile communication. It is used in radar and navigation systems.

Which is better spread spectrum or code division multiplexing?

The result is an occupied bandwidth approximately equal to the coded rate. Therefore, CDM and spread spectrum are used interchangeably. The transmitter and receiver require a complex electronics circuitry. The main advantage of CDM is protection from interference and tapping because only the sender the receiver knows the spreading code.

What are the different types of multiplexing applications?

1 Analog Broadcasting 2 Digital Broadcasting 3 Telephony 4 Video Processing 5 Telegraphy