Optimal PAPR reduction scheme for MIMO SC-FDMA-performance evaluation study

Abstract

The standard organization Third Generation Partnership Project (3GPP) aiming high data rate and high throughput developed long term evolution (LTE). Two multiple access schemes used in LTE for satisfying the requirements of high data rate and high throughput are Orthogonal Frequency Division Multiple Access (OFDMA) and Single Carrier Frequency Division Multiple Access (SC-FDMA). But a major problem faced by OFDMA is higher peak to average power ratio (PAPR) that causes an increase in the power of transmitter in uplink. Therefore for uplink transmission, OFDMA scheme cannot be considered. In uplink, a modified form of OFDMA called SC-FDMA can be used where the subsequent transmission of subcarriers helps to reduce the PAPR of the signal. Through the use of space-frequency block code (SFBC), the low PAPR property of SC-FDMA system gets damaged whereas modified SFBC reduces PAPR but causes only slight bit error rate (BER) deterioration. In this paper, we present another coding scheme, space-time block code (STBC) to examine the performance of the system. Results obtained for the work shows that the use of our proposed scheme helps to attain a good reduction in PAPR along with acceptable BER degradation.