The deployment of Fourth Generation (4G) network is in under process. 4G networks will boost wireless communications with super speed (100 Mbit/s – 1 Gbit/s), ultra quality (high quality audio and high definition video) and higher security (strong encryption, decryption and filtering) beyond 3G (Third Generation) networks, but commercial deployment of 4G network may cause total replacement of 3G network and handsets (within 5 – 10 years). 4G network is approached to overcome the still remaining drawbacks of 3G network and to provide a large set of new facilities and services. 4G network will be fully IP based internet and4G network will have broader bandwidth than previous networks, thus 4G networks will be capable to provide higher data rate and faster access to large amount of data(text, picture, audio, video etc.).
Principal technologies required for 4G network are,
ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING (OFDM)
The Orthogonal Frequency Division Multiplexing (OFDM) provides several advantages for physical layer and layer 2. Using OFDM, radio transmission can be optimized by providing a very secure and robust transmission in multipath environment without complexity. In addition with the help of OFDM modulation as a multiple access technology, data to or from several users can be transmitted through different sub channels. This technology will optimize resource allocation and usage of transmission link.
SOFTWARE DEFINED RADIO (SRD)
Software Defined Radio (SRD) provides capability to implement multiband, multi standard base station and terminals. Using SRD operators can reconfigure the networks easily.
e.g.
To increase network capacity operators can easily add several modems at a Base Transceiver Station (BTS).
SRD reduces development effort and costs.
MULTIPLE INPUT MULTIPLE OUTPUT(MIMO)
Multiple Input Multiple Output (MIMO) technology is used when signal multiplexing is required. Using MIMO technology signals transmitted from several antennas and these signals can be received by several antennas. Using MIMO, range and quality of the signal can be improved.
HANDOVER AND MOBILITY
The mobile IP technology has been considered for data and voice is the base of handover technology. In single frequency network handover technology is required. Mobile IP techniques are slow but acceleration can be done using hierarchical and fast mobile IP methods. But the main disadvantage of these techniques is capacity.
Download 4G Mobile Communication Seminar Report .