Abstract: A vehicle or other mobile communication entity (102) locates objects using received (typically radio frequency) signals (104, 106). These received signals included multi-path versions of the transmitted signals (104). The received signals may include packets having location information of the transmission source. The receiving vehicle may track, or know, its own position. The receiving entity may determine properties for a multi-path version of the signal (208, 210). These properties may include a delay, a Doppler and an angle of reception (122, 124) for one or more multi-path versions of the received signal. The receiving entity may also measure an imbalance (504) induced between a pair (or more) of antenna elements (302) for a particular multi-path version of the signal received. This imbalance may be dependent on the angle of arrival of the particular signal being received.

Abstract: A vehicle or other mobile communication entity (102) locates objects using received (typically radio frequency) signals (104, 106). These received signals included multi-path versions of the transmitted signals (104). The received signals may include packets having location information of the transmission source. The receiving vehicle may track, or know, its own position. The receiving entity may determine properties for a multi-path version of the signal (208, 210). These properties may include a delay, a Doppler and an angle of reception (122, 124) for one or more multi-path versions of the received signal. The receiving entity may also measure an imbalance (504) induced between a pair (or more) of antenna elements (302) for a particular multi-path version of the signal received. This imbalance may be dependent on the angle of arrival of the particular signal being received.

Abstract: Methods and apparatus are described for improving receiver performance in a multicarrier communication network in which an encoded symbol (250) is transmitted over a transmission channel (20) in the communications system. A model of the transmission channel (20) is estimated (718, 760), said model characterising an effect of intercarrier interference on at least one carrier in the multicarrier system. The received symbol (250) is decoded (720, 762) using the estimated model to remove a predicted effect of intercarrier interference. A pre-processor (40) is also described for operation in conjunction with a communications receiver (30) in the network. The pre-processor (40) includes a channel estimator (42) operable to estimate at least one feature of the communication channel based on a received signal. The pre-processor (40) modifies the received signal dependent on the at least one estimated feature and provides the modified signal to the communications receiver (30).