Amplify–Quantize–Forward Relay Channel With Quadrature Amplitude Modulation

Quadrature Amplitude Modulation

The simplest type of digital modulation involves transmitting a sequence of waveforms (“symbols”) si(t) of equal durationT where eachwaveform is chosen independently from a set of M. This allows us to transmit up to b = log2(M) bits per symbol. A common sets of such symbols are those where the real and imaginary parts of the complex baseband signal are each modulated in amplitude. This known as...

Quadrature Amplitude Modulation : A simulation study

This report details our implementation and observations of a 16QAM and 4-QAM system. The modem was implemented in software using Simulink. Error bit rates as a function of SNR were studied using Monte Carlo estimation techniques.

Noisy Index Coding with Quadrature Amplitude Modulation (QAM)

This paper discusses noisy index coding problem over Gaussian broadcast channel. We propose a technique for mapping the index coded bits to M-QAM symbols such that the receivers whose side information satisfies certain conditions get coding gain, which we call the QAM side information coding gain. We compare this with the PSK side information coding gain, which was discussed in [1]. Keywords—In...

Adaptive minimum symbol-error rate equalization for quadrature-amplitude modulation

We propose the adaptive minimum symbol-error rate algorithm, which is a low-complexity technique for adapting the coefficients of a linear equalizer in systems using pulse-amplitude or quadrature-amplitude modulation. The proposed algorithm very nearly minimizes error probability in white Gaussian noise and can significantly outperform the minimum-mean-squared error equalizer (by as much as 16 ...

Bit Error Probability Computations for M-ary Quadrature Amplitude Modulation