BPSK Normal

To configure Binary Phase Shift Keying (BPSK) Normal modulation in a Software Defined Radio (SDR) receiver, you must properly align your hardware settings, demodulation blocks, and synchronization loops. 1. Hardware and RF Front-End Setup

Center Frequency: Set your SDR to the exact carrier frequency of the target BPSK signal.

Sample Rate: Choose a rate at least 4 to 8 times the signal’s symbol rate.

Gain Control: Adjust RF/IF gain to maximize signal-to-noise ratio (SNR) without clipping. 2. Digital Signal Processing (DSP) Pipeline

Low-Pass Filter: Apply a root-raised-cosine (RRC) filter matching the transmitter’s filter shape.

Symbol Timing Recovery: Use a Müller and Müller (M&M) or Gardner loop to sample at the center of the symbol.

Carrier Frequency Recovery: Implement a Costas Loop to eliminate frequency offset from local oscillator drift.

Carrier Phase Recovery: Use the same Costas Loop to lock the phase, as BPSK encodes data strictly in 0∘0 raised to the composed with power 180∘180 raised to the composed with power phase shifts. 3. Decoding and Framing

Threshold Slicing: Map the real component of the complex signal to binary (positive values to 0, negative to 1). Phase Ambiguity Resolution: BPSK Normal can suffer from 180∘180 raised to the composed with power

phase inversion. Look for a known preamble or unique word to invert the bits if necessary.

Descrambling: Apply any required de-whitening or descrambling polynomials to retrieve the raw data payload.

To help tailer this setup, could you share a bit more information? If you want, let me know:

What SDR software are you using (GNU Radio, SDR#, GNU Radio Companion, or custom Python)?

What is the target signal or satellite you are trying to receive?

What SDR hardware (RTL-SDR, HackRF, LimeSDR, PlutoSDR) do you have connected?

I can provide specific block diagrams, flowcharts, or code snippets based on your tools.