MQAM

AcronymDefinition
MQAMM-Ary Quadrature Amplitude Modulation
MQAMMultiple Quadrature Amplitude Modulation
References in periodicals archive ?
and baseband filtering, samples of the received MQAM signal at the receiver's Matched Filter (MF) output can be modeled as [22]
[R.sub.bt] = bB is the bit rate, is the system bandwidth, and is modulation grade for MQAM modulation scheme [2, 18].
By fixing the symbol rate and adaptation of parameters of signal constellation in MQAM modulator the rate of emptying the communication buffer can be adapted.
Initially the uncoded performance of adaptive modulation based on MQAM and MPSK scheme are investigated.
MQAM has least probability of error than both MDPSK and MPSK in the Weibull fading scenario.
Variable-rate variable-power MQAM for fading channels, IEEE transactions on Communication 45 (10) 1218-1230.
This degradation can be a significant source of system performance degradation if a high order modulation scheme that is sensitive to phase noise, such as M-order quadrature amplitude modulation (MQAM) or multiple phase-shift keying (MPSK), is adopted.
The selection of data rate is by partitioning the value space of SINR into M non-overlapping consecutive intervals and the set of interval is named as [mathematical expression not reproducible] If the instantaneous SINR value is within a certain interval [mathematical expression not reproducible], the fixed transmission rate is chosen by the MQAM modulation technique of the IEEE 802.11a standards [22].
By fixing the symbol rate and adaptation of parameters of signal constellation in MQAM system the rate of emptying the communication buffer can be adapted.
where [DELTA][Florin] is the subcarrier bandwidth, and [GAMMA] is a constant that depends on the bit error ratio (BER),the coding gain and the modulation scheme, [GAMMA]= [-ln(5BER)/1.5] in MQAM. We assume [GAMMA] = 1 for the study of modulation is out of scope of this work.
Values of the data carriers depend on modulation type (MPSK, MQAM e.t.c.), and are elements of the set x = {[X.sub.0], [X.sub.1], [X.sub.{M-1}], where M is number of symbols in constellation diagram.