![]() ![]() To take advantage of both the modulation schemes advance wireless systems such as WLAN, WiMAX, LTE utilize both for different channel or synchronization signals.įor example BPSK is used for preamble or pilot sequences or beacon frame used for channel and other synchronization purpose. This is due to support of two bits per carrier in QPSK compare to one bit per carrier in the case of BPSK.įigure-2 mention difference between power spectral density of BPSK and QPSK modulated spectrum. QPSK has advantages of having double data rate compare to BPSK. To the mobile subscribers compare to QPSK.įig.3 Power spectral density of BPSK vs QPSK With BPSK, higher distance coverage can be achieved from the base station cellular cell or fixed station In QPSK demodulator four decision points are needed. While QPSK represents two bits using complex carrier symbol each having 90 degree shift with one another.īPSK is considered to be robust modulation scheme compare to the QPSK as it is easy in the receiver to receiver the original bits.Īfter passing both BPSK and QPSK through channel and noise, in the BPSK demodulator only two decision points are required to retrieve the originalīinary information. Usually above complex values are multiplied with 1/sqrt(2) or 0.7071 in order to normalize the modulated waveform.Īfter understandig the modulation types individually, now let us examine the difference between BPSK and QPSK.Īs mentioned above in the table, BPSK represents binary input 1 and 0 w.r.t. The short form of Binary Phase Shift Keying is referred as BPSK.įor step by step description of how bit streams get converted to BPSK symbols, refer BPSK modulation. ![]() Terms of many useful factors such as constellation diagram, robustness, power spectral density(PSD) etc. On this page we will compare both BPSK vs QPSK modulations and also will go through difference between BPSK and QPSK in Another input required for modulating the digital input bit stream is also analog RF carrier.īPSK and QPSK modulations techniques have their own advantages and disadvantages and hence are used in the same wireless system forĭifferent purpose. Shown below in power spectral density plot. in binary form) and output is modulated analog spectrum as These are digital modulation techniques where in data input is digital (i.e. This page on BPSK vs QPSK describes difference between BPSK and QPSK modulation techniques.It mentions link to basics of BPSK and QPSK along with difference between various terminologies. BPSK vs QPSK-Difference between BPSK and QPSK
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