Communication device and method
AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorsBengt Lindoff, Bo Bernhardsson, Johan Nilsson
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Abstract
Methods and devices for detecting a symbol in a radio channel and for cell identification are disclosed. A signal is received from the radio channel and the signal is filtered by a filter being responsive to the symbol thereby establishing a first signal. A second signal dependent on the noise floor of the received signal is established—whereby a time interval expected to include multi-path components being excluded or suppressed. A third signal being the ratio between the first signal and the noise floor is established, and the presence of the symbol is detected by detecting a peak in the third signal.
Claims34
A method for detecting a symbol in a radio channel comprising the steps of:
- receiving a signal from the radio channel;
- filtering the received signal through a first filter being responsive to the symbol, thereby obtaining a first signal;
- establishing a noise floor estimate of the received signal by excluding or suppressing some samples of the received signal that are expected to include multi-path components and are close to a time instant for which the noise floor estimate is established;
- establishing a second signal being a representation of the ratio between the first signal and the noise floor estimate;
- and
- detecting the presence of the symbol by detecting a peak in the second signal.
A communication device configured to detect a symbol of a radio channel, the communication device comprising:
- a receiver for receiving a signal from the radio channel;
- a first filter connected to the receiver, the first filter being responsive to the symbol;
- a noise floor estimator connected to the receiver or the first filter, the noise floor estimator configured to provide a signal dependent on a noise floor of the received signal determined by excluding or suppressing some samples of the received signal that are expected to include multi-path components and are close to a time instant for which the noise floor estimate is established;
- a calculating unit connected to the first filter and the noise floor estimator, the calculating unit configured to calculate the ratio between the signals from the first filter and the noise floor estimator;
- and
- a detector connected to the calculating unit configured to detect a peak in the signal from the calculating unit.
Dependencies are inferred from the claim text.