US Patent No. 10,893,477

SAME-CHANNEL INTERFERENCE DETECTION AND EARLY RECEIVER POWERDOWN FOR OFDM SIGNAL PROCESSOR


Patent No. 10,893,477
Issue Date January 12, 2021
Title Same-channel Interference Detection And Early Receiver Powerdown For Ofdm Signal Processor
Inventorship Logeshwaran Vijayan, Hyderabad (IN)
Sriram Mudulodu, Hyderabad (IN)
Assignee Silicon Laboratories Inc., Austin, TX (US)

Claim of US Patent No. 10,893,477

1. A power saving receiver for detection of interference in a communication channel having a plurality of subcarriers, the power saving receiver comprising:a controller operative to remove power from a receiver;
the receiver operative to measure a first signal strength of a first plurality of subcarriers over a first frequency range of the communication channel;
the receiver also operative to measure a second signal strength of a second plurality of subcarriers over a second frequency range of the communication channel which is non-overlapping with the first frequency range;
the receiver comparing the first signal strength of the first plurality of subcarriers to the second signal strength of the second plurality of subcarriers;
the controller removing power from the receiver if the first signal strength of the first plurality of subcarriers is different than the second signal strength of the second plurality of subcarriers by an amount greater than a threshold, the threshold being greater for a Binary Phase Shift Keying (BPSK) modulation than for a Quadrature Amplitude Modulation (QAM);
where the first signal strength of the first plurality of subcarriers or the second signal strength of the second plurality of subcarriers is measured during a packet short preamble or a packet long preamble; and
the first signal strength of the first plurality of subcarriers or the second signal strength of the second plurality of subcarriers is an error vector magnitude.