Channel reencoding to reduce invalid physical downlink control channel signals

A device, comprising:

• one or more memories;
• and
• one or more processors, coupled to the one or more memories, configured to:
• receive a physical downlink control channel (PDCCH) signal from a base station;
• provide the PDCCH signal to a special-purpose processor of the device;
• decode encoded bits of the PDCCH signal to generate coded bits;
• reencode the coded bits;
• calculate a detection error probability of each coded bit at an output of soft demodulation;
• calculate a channel decoding error probability that cyclic redundancy check bits are still attached to the coded bits;
• calculate an error probability of channel reencoding, of each coded bit of the coded bits, due to error propagation of polar decoding and reencoding;
• calculate a probability density of a bit mismatch ratio associated with the coded bits;
• calculate a threshold based on the detection error probability, the channel decoding error probability, the error probability of channel reencoding, and the probability density of a bit mismatch ratio;
• determine whether the bit mismatch ratio associated with the coded bits is greater than the threshold;
• determine that the PDCCH signal is invalid based on the bit mismatch ratio being greater than the threshold;
• and
• discard the coded bits based on determining that the PDCCH signal is invalid.

A non-transitory computer-readable medium storing a set of instructions, the set of instructions comprising:

• one or more instructions that, when executed by one or more processors of a device, cause the device to:
• receive a physical downlink control channel (PDCCH) signal from a base station;
• provide the PDCCH signal to a special-purpose processor of the device;
• decode encoded bits of the PDCCH signal to generate coded bits;
• reencode the coded bits;
• calculate a detection error probability of each coded bit at an output of soft demodulation;
• calculate a channel decoding error probability that cyclic redundancy check bits are still attached to the coded bits;
• calculate an error probability of channel reencoding, of each coded bit of the coded bits, due to error propagation of polar decoding;
• calculate a probability density of a bit mismatch ratio associated with the coded bits based on the detection error probability, the channel decoding error probability, and the error probability of channel reencoding,
• wherein the probability density corresponds to a threshold;
• determine whether the bit mismatch ratio associated with the coded bits is greater than the threshold;
• and
• perform one or more actions based on determining whether the bit mismatch ratio associated with the coded bits is greater than the threshold.