An energy efcient transmission scheme for OFDM systems in LTE

In orthogonal frequency division multiplexing (OFDM) systems, for given total transmit power, insertion of the noninformation bearing cyclic prefix (CP) will reduce the effective energy per information bit. Generally, the energy loss is proportional to the ratio of CP length to the symbol duration. If the CP is too long, the energy loss will be considerable high. In this paper, we propose an energy efficient transmission scheme for OFDM systems in Long Term Evolution (LTE) which is developed based on reduction of the CP energy. Simulation results show that the proposed method can save up to about 10% of the total energy, while keeping almost the same bit-error-rate (BER) performance in some applications.