Phase rotation optimization in hybrid of PTS-CAPPR method by GA for PAPR reduction in OFDM systems

Abstract

In this paper, we propose a new PAPR reduction using the hybrid of a partial transmit sequences (PTS) and cascade adaptive peak power reduction (CAPPR) methods with genetic algorithm (GA). These methods are used in an orthogonal frequency division multiplexing (OFDM) system. The OFDM employs orthogonal sub-carriers for data modulation. These sub-carriers unexpectedly present a large peak to average power ratio (PAPR) in some cases. A proposed reduction method consists of these two methods and realizes both advantages at the same time. The proposed method when number of sub-block increases, PAPR is gettin g small. However, the calculation cost of its selection must be considerably large. We introduce GA method, the total calculation cost becomes drastically reduced.The parameter for simulation used standard WLAN in IEEE 802.11a system. In simulation results, the proposed method shows the improvement on P APR and also reveals the high performance on bit error rate (BER) of an OFDM system.

The hybrid of PTS-CAPPR methods with MA for PAPR reduction in OFDM systems

“…We call process the construct offspring. The following is one of example: Table 1 [8], [10]. The modulation signal ( ) x i is used in CAPPR normalized to maximum equal "1", the definition of th d is target value normalized to 0.90.…”

“…The PAPR can be minimized by an appropriate combination of sub-blocks and the optimum phase rotation. The modified input data are then fed to CAPPR [8] process. Figure 2 shows the block diagram of the hybrid of PTS-CAPPR method.…”

“…Additionally, the sub-carriers in each sub-block are weighted by the phase rotations optimization which search from MA. The modified input data are then fed to CAPPR process [8]. The CAPPR process which used APPR modules are cascade with connected.…”