Neighbor Cell Interference Minimization Using Uplink Power Control in Long Term Evolution

Abstract

Long Term Evolution (LTE) has been investigated, because of high data rate, low latency and packet optimized radio access technology. While orthogonal frequency division multiple accesses (OFDMA) is used in multiplexing, the main drawback of OFDMA is high peak to average power ratio (PAPR) properties of an OFDMA signal, resulting in worse uplink coverage. Thus SC-FDMA (Single Carrier Frequency Division Multiple Access) is suggested using LTE uplink, which presents better PAPR properties compared to OFDMA signal. But In uplink transmission, the user equipment (UE) causes the interference to other neighbor cell, this degrades the cell performance, therefore close loop power control (CLPC) and open loop power control (OLPC) are suggested and modeled to solve this problem. In the OLPC, the signal strength UE which reach to neighbor cell is considered to set transmit power. In CLPC the adjustment of power control (PC) command continuously and then set transmit power. The main contribution of this research focuses on the affect of OLPC and CLPC in the bit error rate (BER). The simulation is achieved using MATLAB and the results showed that, at signal to noise ratio (SNR) 25dB, the OLPC and CLPC given typical BER of (10 ). In term of the power, the OLPC consumes much power as compared to CLPC. Compared when the SNR less than 10dB, the OLPC achieves better results as compared to CLPC; otherwise the CLPC gives better results.