Filter Banks for Next Generation Multicarrier Wireless Communications
The theoretical capacity limits in communications can be approached by multi-carrier techniques. With radio channels, multi-carrier techniques can be combined with multi-antenna transmitters and receivers to provide efficiency. Existing or planned transmission systems rely on the OFDM technique to reach these goals and a considerable amount of research has been devoted to these techniques during the last 20 years. However OFDM has a number of drawbacks, such as the use of the cyclic prefix to cope with the channel impulse response which results in a loss of capacity and the requirement of block processing to maintain orthogonality among all the sub-carriers.