Title :
The optimum ring ratio of 16-APSK in LTE uplink over nonlinear system
Author :
Chayratsami, P. ; Thuaykaew, Sorapong
Author_Institution :
Dept. of Eng. Educ., King Mongkut Inst. of Technol. Ladkrabang, Bangkok, Thailand
Abstract :
Single Carrier Frequency Division Multiple Access (SC-FDMA) has been selected for use in the Long Term Evolution (LTE) uplink due to its lower Peak-to-Average Power Ratio (PAPR) relative to OFDMA The resultant lower PAPR results in fewer excursions into the amplifier´s nonlinear region, where signal distortion can occur and results in degraded bit error rate (BER). The SC-FDMA scheme normally applies 16-ary Quadrature Amplitude Modulation (16-QAM), but amplitude phase shift keying (APSK) modulation has a lower PAPR than does 16-QAM, resulting in improved BER This paper investigates the constellation ring ratio of the 16-APSK modulation scheme and its effects on BER through its effects on the PAPR. Simulation results are used to conclude that a ring ratio that ranges from 2.5 to 3.5 delivers the best results and provides BER and PAPR improvement.
Keywords :
Long Term Evolution; OFDM modulation; amplifiers; error statistics; frequency division multiple access; nonlinear systems; phase shift keying; quadrature amplitude modulation; 16-APSK; 16-APSK modulation scheme; 16-QAM; 16-ary quadrature amplitude modulation; BER; LTE uplink; Long Term Evolution; OFDMA; PAPR; SC-FDMA scheme; amplifier nonlinear region; amplitude phase shift keying modulation; bit error rate; constellation ring ratio; nonlinear system; optimum ring ratio; peak-to-average power ratio; signal distortion; single carrier frequency division multiple access; Bit error rate; Long Term Evolution; Modulation; Nonlinear distortion; Peak to average power ratio; Uplink; 16-APSK; LTE; Nonlinear system; PAPR; SC-FDMA;
Conference_Titel :
Advanced Communication Technology (ICACT), 2014 16th International Conference on
Conference_Location :
Pyeongchang
Print_ISBN :
978-89-968650-2-5
DOI :
10.1109/ICACT.2014.6779189
