Updated Techniques for Advance LTE Downlink Model: Investigation and Evaluation

Abstract

This paper implements an interactive up-and-running transceiver system models for Advanced Long-Term Evolution (LTE) downlink physical layer that investigates and clarifies performance for several effects considering crucial aspects in the design parameters of mobile systems over fading and LTE-Specific channel models. Carrier Aggregation (CA), High Order Modulation (HOM), Multiple-input and Multiple-output (MIMO) utilization, channel estimation, equalization and Link Adaptation enabling techniques have been implemented and investigated in this model. This paper is achieved a transmission bandwidth of about 34.8500 and 19.9000 MHz by aggregating three non-symmetric and two symmetric component carriers (CCs), respectively. At high signal power regions, significant enhancement in the data rate obtained with 256-QAM which applied as HOM over limited transmission bandwidth. The paper also implemented different MIMO schemes that validate the capability of the system to deal with the fading nature of the channel, or its ability to accommodate higher data rates as the Signal-to-Noise Ratio (SNR) increases. To mitigate system degradation due to multipath fading, this paper examined two MIMO detection schemes with ideal and pilot-assisted channel estimation techniques. Finally, the paper showed that the available spectrum exploited efficiently with link adaptation techniques by increasing the number of supported subscribers.