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3 votes
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Is BPSK relevant, or does it even exist, in wireless data transmission?

You are mostly correct. The main problem is that the introductory textbook definition of BPSK as a train of square pulses multiplied by a carrier is so simplistic that it hides what is really going on....
MBaz's user avatar
  • 15.3k
2 votes

Why are all baseband signals low-pass?

If "low-pass" is defined as "does not modulate a carrier", then most signals in nature are low-pass -- asking "why" is a bit like asking why trees have roots: nature ...
MBaz's user avatar
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1 vote
Accepted

Why do I find a low frequency oscillation when I add a carrier frequency to my baseband signal ? And Why is my demodulation step not working?

From the OP's plot it appears there is a very small frequency offset (we see 1/2 cycle envelope in 10 seconds consistent with a frequency offset of 1/20th of a Hz). If sampling was at 10 Hz with a 1/...
Dan Boschen's user avatar
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1 vote
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Adding Narrowband Interference to Spread Spectrum Signal in MATLAB (Baseband Model)

A single tone interferor at baseband is given as $e^{j\omega_c t}$ where $\omega_c$ is the radian frequency within the signal's bandwidth. For example, if we had a spread spectrum signal with ...
Dan Boschen's user avatar
  • 52.1k
1 vote
Accepted

Why are all baseband signals low-pass?

All signals have a bandwidth. For example audio signals can be said to have a bandwwidth from 20 Hz to 20 kHz. Now a telephone system had bandwidth from 300 Hz to 3400 Hz. Some signals have bandwidth ...
Justme's user avatar
  • 2,303

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