Performance of M-QAM, M-DPSK and M-PSK with MRC diversity in a Nakagami-m fading channel
来源期刊：中南大学学报(英文版)2014年第4期
论文作者：Alam S. M. Shamsul Alam Choi GoangSeog
文章页码：1347 - 1352
Key words：M-ary differential phase-shift keying (M-DPSK); M-ary phase shift keying (M-PSK); Nakagami-m fading channel; probability density function (PDF); symbol error rate (SER); M-ary quadrature amplitude modulation (M-QAM)
Abstract: The nature of a wireless communication channel is very unpredictable. To design a good communication link, it is required to know the statistical model of the channel accurately. The average symbol error probability (ASER) was analyzed for different modulation schemes. A unified analytical framework was presented to obtain closed-form solutions for calculating the ASER of M-ary differential phase-shift keying (M-DPSK), coherent M-ary phase-shift keying (M-PSK), and quadrature amplitude modulation (QAM) over single or multiple Nakagami-m fading channels. Moreover, the ASER was estimated and evaluated by using the maximal ratio-combining (MRC) diversity technique. Simulation results show that an error rate of the fading channel typically depends on Nakagami parameters (m), space diversity (N), and symbol rate (M). A comparison between M-PSK, M-DPSK, and M-QAM modulation schemes was shown, and the results prove that M-ary QAM (M-QAM) demonstrates better performance compared to M-DPSK and M-PSK under all fading and non-fading conditions.
Alam S. M. Shamsul Alam, Choi GoangSeog
(Department of Information and Communication Engineering,
Chosun University, 309 Pilmoon Daero, Dong, GwangJu, 501-759, Korea)
Abstract:The nature of a wireless communication channel is very unpredictable. To design a good communication link, it is required to know the statistical model of the channel accurately. The average symbol error probability (ASER) was analyzed for different modulation schemes. A unified analytical framework was presented to obtain closed-form solutions for calculating the ASER of M-ary differential phase-shift keying (M-DPSK), coherent M-ary phase-shift keying (M-PSK), and quadrature amplitude modulation (QAM) over single or multiple Nakagami-m fading channels. Moreover, the ASER was estimated and evaluated by using the maximal ratio-combining (MRC) diversity technique. Simulation results show that an error rate of the fading channel typically depends on Nakagami parameters (m), space diversity (N), and symbol rate (M). A comparison between M-PSK, M-DPSK, and M-QAM modulation schemes was shown, and the results prove that M-ary QAM (M-QAM) demonstrates better performance compared to M-DPSK and M-PSK under all fading and non-fading conditions.
Key words:M-ary differential phase-shift keying (M-DPSK); M-ary phase shift keying (M-PSK); Nakagami-m fading channel; probability density function (PDF); symbol error rate (SER); M-ary quadrature amplitude modulation (M-QAM)
