Abstract: Long term evolution (LTE) is a 3GPP 4G technology which enhances the development in the field of telecommunication and by improving the performance of the network for the different types of traffic flows. 4G LTE is a packet based networks brings some improvements in the form of higher bit rate and lower latencies. OFDMA technique is used in downlink and SC-FDMA technique is used in uplink. PAPR of OFDMA is higher than SC-FDMA. This paper presents reduction in the values of PAPR for OFDMA in downlink system by using pulse shaping filter and capacity of LTE system is improved by using water filling algorithm.

Keywords: 4G LTE, Downlink, Uplink, OFDMA, SC-FDMA, QPSK, 16-QAM, 64-QAM, PAPR, LTE Capacity, SER.