4G technology is based on OFDM(orthogonal frequency division multiplexing) ,this allows the data to be send over hundreds of parallel streams thus increasing the amount of data that can be send with less complexity as compared to 3G data transfer . The standard systems for 4G are WiMAX, HSDPA, UMTS, and TDD UMTS.
The aim of introducing an enhanced 4G can be:
- It uses “adaptive processing”, which helps in the reduction of channel interference and reception by constantly switching channels.
- It uses “smart antennas”, which has higher directivity increasing the efficiency of receiving the radio signals transmitted from the terminal end.
- High network capacity and smooth handoffs between heterogeneous networks.
- Providing ease of access for wireless broadband services, multimedia messaging (MMS), mobile TV, HDTV, video conferencing.
- It uses IP, packet switched network which is capable of utilising all it resources effectively.
- Power saving mechanisms and advanced QoS.
- It provides low latency for real time applications.
- 4G works on variable data rates as it switches its channel frequently as it uses OFDM. OFDM provides high spectral efficiency. OFDM also provides high resiliency to RF interference and multipath distortion is low, due to which the inter symbol interference (ISI) is very low. As also due to soft handoffs, the voice clarity is extremely high.
As technology progresses it makes our lifestyle more and more leisurely. With the high mobility and less of time, are the biggest constrains 4G can resolve.
4G will bring a revolutionary change in the wireless technology, where such different access technologies as cellular, cordless, wireless LAN type systems, short-range wireless connectivity, and wired systems will be
Combined on a common platform to complement each other in the best possible way. The development is expected to inspire the progressive trend in the current technology.
The elementary purpose of 4G service is to be interactive due to convergence network which is applicable for home-networking, telemetric, and sensor-network service.
4G will commercialize the current scenario. But due to high cost and hi-tech infrastructure needed there is being delay in 4G to come up in INDIA. But, it’s not like 4G technology is not present in the market. Recently, NTT Docomo has declared to launch 4G services in Japan around 2010-2015. Providing maximum data transfer rate of 20 Mbps.
4G to be launched in two cities of U.S. by Verizon this year, using 700 MHz frequency band.
Zain Internet Service provider (ISP) and Mada has announced the formal launch of the 4G wireless broadband WiMax E-version service. The announcement was made Wednesday the 25th of March. This was held at an event organised by both companies under the auspice of the Minister of Information and Communications Technology Eng. Bassem Al Rousa.
This service offers high speed wireless broadband internet to customers.
The 4G wireless broadband internet service will be accessible and read for use through Motorola Wi-Max solution. This service is going to be the first of its kind in terms of speed, strength of coverage, geographic outreach, and the availability of a user friendly plug and play devise.
Also, Sprint is working on a WiMAX-enabled Smartphone that will support both 4G and 3G connectivity. WiMax-connected device will run three or five times faster than the 3G connected devices with varied features including video conferencing, improved multimedia quality with high definition and low latency. Thus, seeing the recent scenario we can conclude that it is inevitable that 4G will replace 3G in the long run. There are still chances of 4G to flourish due to new innovations and adaptive changes in the technology.