Patent ID: 9509366
Filing Date: 2016-11-29
CPC Classification: H04B,H04L

Claim Text:
1. An interference estimation circuit in a receiver, for estimating interference of a received signal, comprising: a decoder, for separating the received signal transmitted in accordance with antenna transmit diversity into the first decoded signal and a second decoded signal by orthogonal patterns corresponding to each transmitting antenna of a transmitter, wherein the received signal comprises a pure signal and an interference signal, wherein the pure signal comprises a signal transmitted by the transmitter to the receiver; a signal generator, for generating an orthogonal signal orthogonal to partial symbols of a plurality of pilot signals of the received signal, wherein the generated orthogonal signal comprises an orthogonal code un-used by the transmitter; a first symbol extractor, for extracting partial symbols of the first decoded signal and outputting a first extracted signal, wherein the first decoded signal contains one of the plurality of pilot signals, a second symbol extractor, for extracting partial symbols of the second decoded signal and outputting a second extracted signal, wherein the first extracted signal is substantially orthogonal to the orthogonal signal; and a first mixer, coupled to the signal generator for receiving the orthogonal signal, coupled to the first symbol extractor for receiving the first extracted signal, outputting a first mixed signal of the orthogonal signal and the first extracted signal for interference estimation, wherein the first mixed signal is generated by canceling the pure signal of the first decoded signal such that the first mixed signal is a first interference signal of the interference signal of the received signal, the first interference signal resulting from a respective fading channel effect corresponding to the first decoded signal, and wherein each of the first symbol extractor and the second symbol extractor comprises an input node for respectively receiving the first decoded signal and the second decoded signal, and an output node for respectively outputting a first extracted signal and a second extracted signal.