Assessment of LTE Uplink Power Control with Different Frequency Reuses Schemes (original) (raw)
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LTE downlink is using Orthogonal Frequency Division Multiple Access (OFDMA) multiple access system which have high invulnerability from multipath problem. One of the weakness of OFDM system is the high level from Peak to Average Power Ratio (PAPR) that was required higher level transmit power for maintaining the Bit Error Rate (BER) requirement. Using uplink scheme with Single Carrier FDMA (SC-FDMA) which is OFDMA modification, will be offered better level of PAPR than its conventional OFDM. The main problem of using OFDMA is the high level of PAPR, while using SC-FDMA the problem is intra-cell interference. Intra-cell or inter-cell interference is the common problem that can reduce the LTE performance. Minimizing received power for each users (UE) which is still at acceptable tolerance parameter, can be used for reducing the interference problem to another UE. Power control is the appropriate solution for minimizing the interference level. In this paper will be analyzed the power c...
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Power control is an efficient technique to mitigate the effect of interference, combat the Near-Far problem and conserve the battery life. Thus, an effective implementation of different power control algorithms in cellular radio communication systems can offer a significant improvement in the Quality of Service (QoS) to all the users. In this paper, increasing system capacity and using frequency reuse concept at the same cell will be investigated. That is because of the use of a new Multi-Level Power Control (MLPC) Algorithm to enhance the network performance by the ability of using the available channels in an efficient way and mitigate the interference at the same cell. System simulations are used to compare the performance of the proposed algorithm with the traditional one which done using dense Monte Carlo simulations. In addition, the effects of some system model parameters are discussed.
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In a 3rd Generation Partnership Project Long Term Evolution-Advanced (3GPP LTE-A) uplink, user equipment (UE) has a maximum transmission power limit defined by the UE power class. Generally, the cell edge UE has a higher probability to be constrained by the maximum transmission power level owing to the compensation of the large pathloss. When the UE transmission power is constrained by the maximum level, allocating a higher number of physical resource blocks (PRBs) than the UE power capability can afford will reduce the transmission power to be allocated per PRB, resulting in inefficient use of power resources. To avoid this power inefficiency, the uplink transmission power can be controlled according to the number of PRBs allocated using the power headroom report-based power efficient resource allocation (PHR-PERA) scheme proposed in this paper. Furthermore, adaptive open-loop power control (OL-PC) based on the signal-to-interference-plus-noise ratio (SINR) and the uplink interference is used to improve the cell capacity. By the uplink power control employing the proposed PHR-PERA scheme, the macro and femto UE throughputs were increased by 49.9 and 5 %, respectively, compared to the case of conventional fractional power control (FPC). Additional gains of 21.9 and 4.8 % for macro and femto UE throughputs, respectively, were achieved by adaptive OL-PC. The performance of fast closed-loop power control (CL-PC) based on the received SINR is also evaluated in this paper. The simulation results demonstrate that CL-PC supports OL-PC by compensating the fading effect for the UE uplink SINR to meet the target SINR.
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—Power efficiency represents a key concern in the mobile communication field. Poor power efficiency leads to shorter battery life and increases the cost of the mobile device. Improving power efficiency is more important for uplink transmission since in uplink the transmitter is placed in the battery-powered mobile device which has limited power resources. In this paper we propose a power efficient scheme, CPM-SC-IFDMA, for uplink transmission in LTE (Long Term Evolution). The proposed scheme, CPM-SC-IFDMA, combines the key advantages of CPM (continuous phase modulation) with SC-IFDMA (Single Carrier Frequency Division Multiple Access with Interleaved subcarrier mapping) in order to increase the power amplifier efficiency of the transmitter. In this work, we investigate the bit error rate (BER) performance of the proposed scheme in LTE specified channels. The BER performance of the CPM-SC-IFDMA scheme is compared with that of a LTE specified transmission scheme, QPSK-LFDMA (QPSK modulated SC-FDMA with localized subcar-rier mapping), combined with convolutional coding (CC-QPSK-LFDMA). We first show that CPM-SC-IFDMA has a much higher power efficiency than CC-QPSK-LFDMA by simulating the PAPR (peak-to-average-power-ratio) plots. Then, using the data from the PAPR plots and the conventional BER plots (BER as a function of signal-to-noise-ratio), we show that, when compensated for power efficiency loss CPM-SC-IFDMA has a superior performance relative to CC-QPSK-LFDMA by up to 3.8 dB in the LTE specified channels.