4-QAMFour-Phase Quadrature Amplitude Modulation
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25 MHz Bandwidth Number of Bits 72 bits used in One Frame Number of 4-QAM 36 subcarrier Symbols Number of Pilot 4 Subcarriers Number of 32 Information Subcarriers Zero Padding 56 Length (including DC) IFFT/FFT Length 128 (N)
The worst case of fading in wireless communication channel is the Rayleigh fading the average SEP versus average SNR in dBs for Q-PSK and 4-QAM square constellation.
This is due to the fact that 4-QAM constellation is achieved from 4-PSK by simply rotating it through an angle of 450 in the CCW direction.
c] depends upon preset PAPR specification and average signal power, so it will remain constant for all OFDM symbols in case of PSK and 4-QAM.
However, in PSK and 4-QAM modulation, average power remains constant.
3 shows the estimated probability distributions for J = 4 for 4-QAM modulation using the feature S, given in Eq.
5-7 show performance evaluation for OFDM system with 4-QAM modulation.
It can be seen that as J increases in (i), (ii), (iii) and (v), the CCDF approaches the CCDF of 4-QAM with fixed compander in Fig.
4 shows the BER performance of the FSD for different signal ordering schemes in a 4x4 MIMO system using 4-QAM modulation.
25dB are remarked in the BER performance of the FSD when employing FSD-ZF-SQRD in a 4x4 system using 4-QAM, 16-QAM, and 64-QAM, respectively.
2] is used, the performance of FSD using 4-QAM is degraded at medium Eb/No values, whereas the performance is still intact when 16-QAM or 64-QAM is used.
Reduced Computational Complexity (%) Threshold 4-QAM 16-QAM 64-QAM [P.