Patent ID: 9628303
Date: 2017-04-18
CPC Classifications: H03M,H04L

Claim:
1. A receiving apparatus comprising: receiving circuitry, which, in operation, receives a signal including a short preamble and a data period time-multiplexed with the short preamble, the short preamble having a plurality of pilot subcarriers and a plurality of null subcarriers, the plurality of pilot subcarriers being mapped at determined frequency intervals in a transmission band; null carrier extraction circuitry, which, in operation, extracts signals of the plurality of null subcarriers from the received signal; first interference detection circuitry, which, in operation, detects a plurality of first interference levels of the plurality of subcarriers in the transmission band based on signal levels of the extracted plurality of null subcarriers; transmission path estimation circuitry, which, in operation, estimates a transmission path characteristic based on the received signal and determines a plurality of first reliability levels corresponding to the plurality of subcarriers in the transmission band; reliability correction circuitry, which, in operation, corrects the plurality of first reliability levels based on the plurality of first interference levels; soft decision circuitry, which, in operation, makes a soft decision on a demodulated signal of the received data using the corrected plurality of first reliability levels; and error correction circuitry, which, in operation, performs error correction based on a result of the soft decision and reconstructs the received data, wherein the first interference detection circuitry detects power values obtained by subtracting least null subcarrier power from receiving power of the null subcarriers, as the plurality of first interference levels.