Time division multiple access

example in detail later. MULTIPLE ACCESS TECHNIQUES These techniques allow a large number of users to access information through the same channel in wireless communication systems, also regarded as air-interface as mentioned previously. Thus, also making effective use of allocated bandwidth. The following three techniques come under this category: FDMA – Frequency División Multiple Access TDMA – Time Division Multiple Access CDMA – Coded Detection Multiple Access For, FDMA, an allocated bandwidth

CDMA BASED BUS ARBITRATION IN SoC Mayank Chakraverty(1) , Ritaban Chakravarty(2) , Sandeep Mandava(3) M.Tech Nanotechnology, Nanotechnology Division, School of Electronics Engineering , VIT University, Vellore. may_ank2004@indiatimes.com(1) , ritaban.87@gmail.com(2) , sandeep1415@gmail.com(3) 09962265270(1), 09566810791(2) , 09092517336(3) ABSTRACT Future SoC will be implemented with the latest arbitration scheme. CDMA is the latest

5.1 OFDM-IDMA Scheme Various multiple access technique like TDMA, CDMA, FDMA has been used in wireless network for communication. But OFDM i.e orthogonal frequency division multiple access offers number of advantages over these multiple access techniques, such as this scheme can provide simple treatment against ISI and also reduces cross cell interference. The IDMA in combination with OFDM allow effective and simple turbo type iterative MUD algorithm which can be easily implemented to large number

medium access control(MAC). The problem presented to us is how to access a communication medium in such a way that transmissions from different users will not interfere with each other or at least keep the interference, if any, to a minimum degree so that users can reliably communicate with their intended destinations. The full name of the mentioned multiple scheme are as follows: FDMA – Frequency division multiple access WDMA – Wavelength division multiple access CDMA – Code division multiple access

To achieve this, multiple access protocols coordinate the transmission. There are three classes of multiple access protocols, random access, taking-turns and channel partitioning. With random access protocol, each node tries to randomly to access the complete broadcast link, without any regard to the other nodes. Taking-turns protocol utilizes some type of turning mechanism, which designates which node is allowed to transmit. Channel partitioning protocol divides the channel (time slots, frequency

Mobile telephone call: A mobile device initiates a call by sending the number of the called device on the preselected setup channel. In this process, the the mobile device firstly checks whether the setup channel is idle by examining information that comes from the BS channel. If it finds that the setup channel is idle, the mobile device may transmit the information of number to the BS. The BS then sends the request to the MTSO. Mobile device paging: The MTSO then tries to complete the connection

INTRODUCTION: Code division multiple access (CDMA) is a technology which is used for radio communication purpose. Multiple access technique is a broad area for communication purpose , CDMA is an example of multiple access technology, through which several number of transmitter can send information in a single communication channel. In case of CDMA a particular bandwidth can shared between several number of users. To permit this technique to achieve without undue interference between users, spread

bandwidth into large number of narrow band orthogonal subcarriers [1, 2]. Thus the signal bandwidth becomes very less compared with coherence bandwidth ensuring no ISI in time domain and flat fading in frequency domain. Multicarrier systems such as Orthogonal Frequency Division Multiplexing (OFDM) and Multi Carrier Code Division Multiple Access (MC-CDMA) were considered to be the best technologies for 4G wireless communication [1, 2]. Fig. explains the spectrum of multicarrier and single carrier systems.

supplementary scrambling codes. The supplementary scrambling code approach loses the benefit of the transmissions being orthogonal from a single source, and consequently should be avoided. Using a shared channel resource maintains this benefit and in the mean time lessens the downlink code resource

specified to support display, battery and computational power etc. 4G wireless mobile communication networks should not focus on air interface and data rate, but instead cover advance wireless mobile communication networks and high speed wireless access system into different platforms. The era of new wireless communication is evolving and it will soon penetrate into daily life and change the way we live. The key concept is integrating the 4g capabilities with all of the existing mobile technology