Difference between Wi-Fi and Wi-Max

Parameter	Wi-Fi	Wi-Max
Acronym for	Wireless Fidelity	World Interoperability for Microwave Access
Description	It is a wireless technology that allows any electronic device to exchange and transfer data wirelessly.	It a wireless technology which delivers carrier class, high speed wireless broadband at low cost and covering large distance than Wi-Fi.
IEEE Standard	IEEE 802.11	IEEE 802.16
Implementation	It is basically an implementation of wireless Local Area Connection within a small building, a college, or an institutional building.	It is a wireless broadband metropolitan technology whose objective is to interconnect houses, buildings, or even hot spots to allow communication between them or with other networks.
Cost	Can be implemented by using low cost access pints.	Wi-Max technology requires costly infrastructure.

Difference Between CDMA and GSM

Parameter	CDMA	GSM
Acronym for	Code Division Multiple Access and also known as IS-95 or CDMAone.	Global System for Mobile Communication.
Technology Used	This Technology is based on spread spectrum technology and does not require dividing the channel by time. It also allows several users to share same frequency in a given band or space. Users are isolated by bipolar sequences and can share same frequency.	In this technology Carrier is divided into number of time slots. These different time slots are assigned to each user and until ongoing call is not finished, no other user can access this assigned slot.
Concurrent User Access	Same frequency is used by several users on the same time and can accommodate more users per MHz of bandwidth than any other technology.	Each user uses separate time slot that can be used by one user at a time.
Network Portability	No such feature is available and hence international roaming is a Problem and very limited support is available.	The availability of Subscriber Identity Modules (SIM) allows users to switch networks.