US 6,714,609 B1Granted

Co-channel interference in a receiver

AssigneeNokia Networks Oy

InventorJyrki Keisala

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Abstract

The invention relates to a reception method and a receiver for a TDMA radio system, in which received signals include a desired signal and one or more interference signals, which desired signal and interference signal include a predetermined sequence, by which the signals can be separated from each other. The receiver searches for the most interfering interference signal and forms a signal estimate of the desired signal using the predetermined sequence of the desired signal. The receiver then forms the first residual signal, which describes the difference between the signal estimates of the received signal and the desired signal; the receiver then forms the second residual signal, which describes the difference between the received signal and the co-channel signal estimate. The receiver compares the first residual signal with the second residual signal and based on the comparison, selects either single detection or joint detection to detect the received signal.

Claims16

Dependent claims

A reception method used in a radio system, in which a receiver receives signals comprising a desired signal and one or more interference signals, which desired signal and interference signals comprise a predetermined sequence, by which the signals can be separated from each other, characterized by

forming a signal estimate of the desired signal by means of the predetermined sequence of the desired signal;
searching for the most interfering interference signal and forming a co-channel signal estimate by means of the predetermined sequences of the desired signal and the interference signal;
forming the first residual signal, which describes the difference between the received signal and the signal estimate of the desired signal;
forming the second residual signal, which describes the difference between the received signal and the co-channel signal estimate;
comparing the first residual signal with the second residual signal an don the basis of the comparison, detecting the received signal either by one signal detection, whereby the effect of the interference signal on the desired signal is left unnoticed, or by joint detection, whereby the effect of the interference signal on the detection of the desired signal is taken into account.

2 more elements

A receiver for a radio system, in which signals to be received comprise a desired signal and one or more at least occasionally occurring interference signals, which desired signal and interference signal comprise a predetermined sequence, by which the signals can be separated from each other, characterized in that the receiver comprises:

means for searching for the most interfering interference signal;
means for forming a signal estimate of the desired signal by means of the predetermined sequence of the desired signal;
means for forming a co-channel signal estimate by means of the predetermined sequences of the desired signal and interference signal;
means for forming the first residual signal, which describes the difference between the received signal and the signal estimate of the desired signal;
means for forming the second residual signal, which describes the difference between the received signal and co-channel signal estimate;
means for comparing the first residual signal with the second residual signal and for selecting a detector on the basis of the comparison either a one signal detection or joint detection to detect the received signal.

3 more elements

Dependencies are inferred from the claim text.