M-PSKM-ary Phase-Shift Keying
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The coherent receiver requires a specific signal-to-noise ratio (SNR) to detect the m-PSK signal.
As first step, we quantified the coherent receiver to detect the m-PSK signals as we know that specific modulation formats require a particular optical signal-to-noise ratio (OSNR) in order to be detected at bit-error rate (BER) threshold.
This section presents the analytical and simulated results of the considered AF based HSTRN scheme using M-PSK modulation over generalized fading channels.
1 shows the average SER versus SNR of the considered HSTRN, for infrequent light shadowing (satellite-relay LMS channel), with multiple values of CCI (-5 dB, 0 dB and 5dB) using different M-PSK modulation schemes: BPSK, QPSK and 8-PSK.
Table 3 shows the average data rate over SNR in bits per cycles with different trials for M-PSK modulation.
Table 4 shows comparative Performance of Average Data rate in Bits per cycle over given SNR range of 0 to 30 dB using Sample Mean Estimator (SME) [20], [21], [24] and Population Mean Estimator (PME) using M-PSK Modulation for the phase error variation of 30[degrees],60[degrees] and 90[degrees] from mean.
However, the data rate for M-PSK is obviously lower than that of MQAM, with the same average transmitted power.
In M-PSK and M-QAM systems, the symbol information is contained totally or partially in the phase of [r.sub.n], respectively.
Calculation of BER for M-PSK and M-QAM is done either by estimation of symbol error probability or by evaluation of upper and lower boundaries of noise level.
Since amplitude and phase are constant in M-PSK, this expression can be expanded as