OFDM signal reception in the presence of interference

An apparatus for decoding a received Orthogonal Frequency Division Multiplex (OFDM) signal that occupies a first set of subcarriers in a radio frequency spectrum, the apparatus comprising:

• circuitry configured to ascertain an interference model that represents interference occurring in the first set of subcarriers caused by a transmitted OFDM signal that occupies a second set of subcarriers in the radio frequency spectrum;
• circuitry configured to produce a set of scaled soft values that represents information conveyed by the received OFDM signal over the first set of subcarriers, wherein each scaled soft value in the set of scaled soft values corresponds to a respective one of the subcarriers in the first set of subcarriers, and wherein a scaling amount applied to each of the scaled soft values is based on a corresponding level of interference in said respective one of the subcarriers as indicated by the interference model;
• and circuitry configured to perform a decoding process that generates detected data from the scaled soft values;
• wherein the received OFDM signal and the transmitted OFDM signal are separated from one another by a duplex distance in the radio frequency spectrum, and wherein the apparatus comprises:
• circuitry configured to ascertain a hypothesized interference model that would apply to the first set of subcarriers for each of a set of one or more hypothesized signals being transmitted in the radio frequency spectrum at a location that is substantially one half the duplex distance away from the received OFDM signal, wherein each of the hypothesized signals, when mixed with the transmitted OFDM signal that occupies the second set of subcarriers, gives rise to third order intermodulation products (IM3) located within one or more of the first set of subcarriers;
• and circuitry configured to ascertain which one of the hypothesized interference models most closely matches measured results, and to use the ascertained one of the hypothesized interference models to at least in part determine a level of scaling applied to each of the soft values.