M-QAMMulti-Level Quadrature Amplitude Modulation
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Accounting for all possible M-QAM symbols, the total number of conditional subgroups formed for fingerprint generation is either M x [N.sub.SG] or M x [N.sub.SG]+1 if an "other" subgroup is required.
If S is the total number of available layers in eU-OFDM, the latency of eU-OFDM at the transmitter is greater than the latency of DCO-OFDM by a factor of 2S - 1 for the same M-QAM modulations used on both systems.
Tabla 1 Inicio de la correccion de errores para cada modulacion QAM simulada M-QAM [E.sub.b]/[N.sub.0] 16 9 32 11 64 13 128 15,5 256 18
But, for most non binary modulation techniques (e.g., M-QAM and M-PSK) an exact expression for BER is hard to find.
Dai, "Effects of LO phase and amplitude imbalances and phase noise on M-QAM transceiver performance," IEEE Transactions on Industrial Electronics, vol.
Like the DA case, we have observed the effect of varying constellation size as well as the bias of NDA estimator for various M-QAM. The packet length l has been set to 1000 symbols for all cases.
To improve spectral efficiency, we introduced adaptive LDPC coded modulation (ACM) at source node which provides multiple coded modulation transmission schemes (CMSs), where each scheme is specified by one of the M-ary quadrature amplitude modulation (M-QAM) and LDPC code pair.
Although, it is generally a sub-optimal modulation scheme, compared to other M-QAM constellations, in the sense that they do not maximally space the constellation points for a given energy.
Chandra [9] derived the closed form series solution for B- PSK, B-FSK, DB-PSK and M-QAM over Rician fading channels.
Therefore, the improved PER calculation for M-QAM scheme for gray mapping, was expressed by Equation (2) [14].