Abstract: Due to increasing demand for data and connectivity, it has become necessary to enhance the data capacity of the existing 4G LTE network. In order to achieve this fit , the use of adaptive modulation and coding with involvement in finding the best combination of modulation scheme and code rate that best maximizes the throughput of the network momentarily for a given signal to noise ratio (SINR)available to the User equipment (UE). A method has been presented in this research work which is based on adaptive modulation and coding (AMC) switching which uses an algorithm that considers a certain given block error rate (BLER) requirement before deciding the best combination of modulation scheme, code rate and transmission mode that is most appropriate for a given available SINR from the UE. Field measurements were carried out to reveal the exact values of SINR values obtainable from a UE in a typical LTE cell. The SINR values were then simulated for different modulation schemes (QPSK, 16QAM, 64QAM and 256QAM, code rates ) varying from 0.13 to 0.92 depending on the modulation scheme and Transmission modes (TM7, TM8 and TM9) to generate the BLER and throughput performance for each unique combination of the stated parameters (modulation scheme, code rate and TM mode). The generated table served as a database to determine the best combination of modulation scheme, code rate and TM mode that best maximizes the throughput for a given input SINR and maximum BLER requirement.
Keywords: 4GLTE, BLER, SINR, Adaptive Modulation and Coding;
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DOI:
10.17148/IJARCCE.2022.11310
