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Questions tagged [qpsk]

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0
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1answer
21 views

Peak-to-Average Power Ratio in OFDMA Communication

I am looking for a formula to calculate the Average Power of a square wave used in APSK Modulation. In my textbook, the example above is given with no formula so I am a loss how the value for ...
2
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0answers
38 views

Offset QPSK Frame sync markers

What actual protocols exist out there that employ Offset Quadrature Phase-Shift Keying (OQPSK)? What do they use for the frame synchronization marker (or "preamble" or "sync word" or "flag")? Do ...
2
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1answer
193 views

How to interpret transitions in a QPSK constellation diagram?

I have one doubt regarding how to analyze a constellation diagram. It is from a QPSK transmitter. The constellation diagram looks typically as books (as a square as you can see in Figure 1), but for ...
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2answers
73 views

Differential QPSK receiver

The communications channel between a QPSK transmitter and receiver can introduce an arbitrary phase change. For this reason, differential QPSK is used. Differential QPSK seeks to solve the phase ...
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2answers
303 views

what relationships exists between the BER vs SNR graphs of QPSK and QAM modulation schemes on data throughput. which scheme does better?

Using QAM and QPSK modulation schemes, RF field measurements like received signal power and pathloss were obtained from where the SNR values were estimated. Their BER values were also calculated and ...
2
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2answers
192 views

Phase rotation for QPSK

I have two SDRs and I want to do a simple test: I want to send data values using QPSK modulation with coordinates: (1,1), (-1, 1), (1, -1), (-1, -1), but on Rx site I got all possible values on the ...
0
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1answer
924 views

Differentiating between 32-QAM and 32-PSK

A communication channel with 4 kHz bandwidth requires 40 kbps data rate. What is the most suitable modulation technique to use in this particular scenario? for this I used the Nyquist theorem. C=2B ...
1
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1answer
172 views

Newbie: From bitstream to QPSK

I'm a complete newbie. I don't want to bother this fantastic resource with my ignorance, but I'm starting to have strange thoughts. How do I go from a bitstream (say, the output of an USB port) to a ...
5
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1answer
1k views

Designing an optimal BPSK and/or QPSK transciever in SDR

I'm currently working on writing firmware for the modem on a cube satellite for my university's satellite team. My primary goal is to implement the data uplink & downlink. The RF system, ...