Advantages and Disadvantages of CDMA | Drawbacks and Benefits of CDMA


In today’s article, we will discuss and learn 10 advantages and disadvantages of CDMA | drawbacks and benefits of CDMA technology with definition, features, applications and uses with images & examples.

The CDMA Stands for Code Division Multiple Access this is a digital cellular technology that uses spread spectrum technique.

CDMA does not use a specific frequency that is not assigned to the user instead they use the available spectrum.

In CDMA security is the main concern area where the individual conversation is encoded. This technology possesses good data and voice communication compared to others.

What is CDMA in Wireless Communications?

CDMA (Code Division Multiple Access) is a kind of multiplexing that facilitates various signals to occupy a signal transmissions channel.

It uses the bandwidth in the best possible manner for better performance and usability.

This technology is widely found in ultra-high-frequency (UVF) cellular technology systems, bands ranging between 800 megahertz (MHz) and 1.9 gigahertz (GHz).

It is a type of cellular technology with two main systems: a base system while the other is mobile subscribers for the user.

Some protocols are used in second-generation (2G), third-generation (3G) in wireless communications.

It forms multiplexing, which allows multiple signals to settle in a single transmission channel, it optimizes the use of available bandwidth.

In CDMA, It communicates with various codes it sends data to every station simultaneously.

Advantages and Disadvantages of CDMA

Advantages and Disadvantages of CDMA
Advantages and Disadvantages of CDMA

Advantages of CDMA in Wireless Communication

  • In CDMA (Code Division Multiple Access) data is not decoded easily because it has given different codes to each individual and hence, it increases cellular communication security.
  • It gives amazing voice quality with more consistent sound compared to GSM (Global System for Mobile Communication).
  • In this technology there is less call drops and interference due to the feature named as handoff. (Handoff can be explained as transferring an ongoing call or data session from one channel connected to the core network to another channel).
  • CDMA has better coverage compared to other and also consumes less power with few antenna sites.
  • The CDMA is approx. 5 times stronger than GSM as it has the capacity to increase more user per MHZ of bandwidth than other networks,
  • It gives better multipath performance.
  • It is highly secured from hackers.
  • The individual conversation is encoded with the help of a pseudo-random digital sequence.
  • This technology is used in Ultra High Frequency (UHF) in cellular telephone systems where a band range is between 800 MHZ to 1.90GHZ.
  • This technology is much different from time division multiple access and frequency division multiple access.
  • With this technology, users can access total bandwidth.
  • The different color codes are used by other users.
  • It does not require any synchronization.
  • It can share the same bandwidth with a large number of users.
  • It matches well with the other cellular technologies.
  • Because of the code allocated to each user is different, and hence there is less chance of error occurring.

Disadvantages of CDMA

  • The time required for sending and receiving signals or data is at once.
  • It does not work in international roaming.
  • The performance of the CDMA system degrades with an increase in the number of users.
  • We want to take care of selecting the code length carefully because it caused a delay.
  • As soon as the number of users increases, the quality of services decreases.
  • The maximum number of the user using it same time there are jammed occurred.
  • The problem arises when we use it near and far in a CDMA technique.
  • It is costly because there is a use of more incredible equipment.
  • The system is more complicated.

How CDMA works

In Code Division Multiple Accesses, every mobile station is allocated a different access code. This code differentiates the mobile user.

Every user on the network is connected to a particular station will be separated by a unique code; a special code separates it, so we called code division multiple access.

Let us consider that on the transmitter side, there are two users: A and B. The narrowband signal has a unique code allocated to it; before transmission, all the signs will be multiplied with a unique code called PN sequence code. These narrowband signals are converted to a wideband signal, and similarly, the same process will be applied to other numbers of the system.

As we notice, code A is different from code B, so each user gets other codes, the basic principle behind CDMA.

So when the code is multiplied with the narrowband signal generated by the user, narrowband signals are converted into wideband signals. All the wideband signals will be transferred over the radio spectrum that is our channel.

Each user sends a signal over a channel, which can be replicated over there; all users use a white band signal.

And in the receiver side, if I want to decrypt the only signal of user A, then we use that code used in the transmitter side the receiver side uses the same code.

So it again covers the wideband signal to narrowband signal, and all the remaining white band signal remains assets, so the frequency we want to decrypt signal will be processed further for the data replication processes.

This is defined as the working style of Code Division Multiple Access (CDMA).

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What is the Difference Between CDMA and GSM?

GSM stands for Global System for Mobile Communication.
It is a digital mobile communication network used to give or receive data and voice signals over a network.
CDMA stands for Code Division Multiple Access; it is a radio communication signal similar to GSM.
GSM is called the second-generation standard for mobile networks and telecommunication.CDMA was used in wireless communication on second generation (2G), and third-generation (3G) existed.
GSM uses the TDMA (Time Division Multiple Access) and FDMA (Frequency Division Multiple Access) to separate the users and cell and transmit the signals.CDMA is based on a spread spectrum technology and makes optimal use of available bandwidth. It allows each user to transmit the data over the entire spectrum at any time.
GSM operates on three different frequencies, which are 900 MHz, 1800MHz and 1900MHz.CDMA use (UHF) ultra-high frequency cellular system with frequency bands ranging between 800MHz to 900GHz.
With GSM technology, we have low-cost mobile set base stations.CDMA technology has high-cost technology.
In GSM, the transmission rate is slow compared to CDMA.In CDMA, the transmission rate is fast as compared to GSM.
GSM is SIM specific; hence it requires a SIM card for communication.CDMA does not need any SIM for communication purposes.
GSM gives less secured communication compared to CDMA.CDMA required good secured communication purposes.
In GSM, signal detection is easy.The detection of the signal is problematic in CDMA.

Features of CDMA

Frequency usage: All the user information are transmitted in the same frequency slot even then information is not mixed up because every PN sequence is a unique sequence, EDD and FDD is a duplex method in which the information has been transmitted.

Soft capacity limit: In these systems, we have a weak capacity, i.e. we can increase as many users as possible, but the only requirement is to have that many different codes.

Soft handoff: Frequency remains the same, but only the channel has been transferred to the new base station for communication.

Near far effect: The user who is far from the base station is transmitting with a low power level, and who is near the base station is sharing with the high power level.

Applications of CDMA

  • It is used in military and commercial applications.
  • It is used in mobile communications.
  • It is used in radar and navigation systems.

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