2022年8月20日 · 本文探讨了在AWGN（加性高斯白噪声）信道中，QAM（正交幅度调制）的误码率性能，通过Eb/N0（信号能量与噪声功率比）与理论误码率的关系，展示了不同阶数QAM和信噪比条件下的一维图示。

2018年7月1日 · At the transmission distance of 5600 km, 128-SP-QAM is superior to PM-16QAM, as the BER is 2.18 × 10 −2 and 2.42 × 10 −2, respectively. 128-SP-QAM can still introduce hundreds of kilometers transmission distance improvement around 6000 km.

In this paper, the higher modulation formats (128 and 256) Quadrature Amplitude Modulation (QAM), for modulation/demodulation the digital signal of the currently used Orthogonal Frequency...

2016年1月1日 · The Bit Error Rate (BER) analysis is performed using different configuration of QAM (Quadrature Amplitude Modulation) such as 16 QAM, 64 QAM, 128 QAM and 256 QAM with the same satellite link.

We experimentally demonstrated an intensity-modulation direct-detection UFMC transmission system over 30-km standard single mode fiber. The BER performance of 64-QAM and 128-QAM UFMC signals are measured and compared with that of the OFDM signals.

2011年12月8日 · Quadrature Amplitude Modulation (QAM) is an important modulation scheme as it allows for higher data rates and spectral efficiencies. The bit error rate (BER) of QAM can be calculated through Monte Carlo simulations. However this becomes quite complex as the constellation size of the modulation schemes increases.

2005年11月30日 · However, since perfect Gray coding is not possible for cross QAMs, using Smith-style Gray coding, this paper derives the exact bit error rate (BER) for cross QAM constellations over additive...

In this article, a robust and sparse Twin Support Vector Regression based on Dual Tree Complex Discrete Wavelet Transform algorithm is proposed and applied to dense 5G InH (Indoor Hotspot) LOS...

2018年5月1日 · After 60-km standard single mode fiber (SSMF) transmission, the experimental results show that, at the bit error rate (BER) of 3.8 × 10 −3, the receiver sensitivity of 128-quadrature amplitude modulation (QAM) can be improved by 1.9 dB using the proposed enhanced ISFA combined with training sequence (TS)-based channel estimation scheme ...

16QAM的计算主要是分成三个部分/情况，也就是上图的金色，黄色和绿色三种情况。 先看金色s0的部分：这个情况和4-QAM一样，其出错概率就是： P_y (n \geq d/2)+P_x (n \geq d/2)-P_x (n \geq d/2)*P_y (n \geq d/2)=2Q ( {\frac {d} {2\sigma}})-Q^2 ( {\frac {d} {2\sigma}})\\