Spatial and Temporal Pre-Equalization
AssigneeTelefonaktiebolaget L M Ericsson (publ)
InventorsHenrik Sahlin, Björn Ulf Anders Sihlbom
Life of this patent
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Abstract
The present invention describes a channel equalizer and a method for channel equalization in a receiver in a multi-user communication system. The method comprises the steps of receiving a signal with at least two antennas to produce at least two antenna input streams, measuring the temporal of each antenna input stream and the spatial correlation between the antenna input streams, determining a user-independent pre-equalization filter from the temporal and spatial correlation, filtering the antenna input streams with the pre-equalization filter, and finally inputting the filtered signal to a user-dependent receiver configured to detect the received data symbols of a given user.
Claims14
A method for channel equalization in a receiver in a multi-user communication system comprising the steps of:
- receiving a signal with at least one antenna to produce at least one antenna input stream,
- measuring the temporal correlation of the at least one antenna input stream and, moreover, measuring the spatial correlation between the antenna input streams when at least two antenna input streams are provided,
- determining a user-independent pre-equalization filter from the temporal correlation when one antenna input stream is provided or determining a user independent pre-equalization filter from the temporal correlation and the spatial correlation when at least two antenna input streams are provided,
- filtering the at least one antenna input stream with the user-independent pre-equalization filter,
- inputting the at least one filtered stream to at least one user-dependent receiver.
A receiver in a multi-user communication system comprising:
- at least one antenna to produce at least one antenna input streams,
- a correlation estimation unit (CEU) for measuring the temporal correlation of each antenna input stream, the correlation estimation unit being further adapted for measuring the spatial correlation between the antenna input streams when at least two antenna input streams are provided,
- a user-independent pre-equalization filter to compensate for the temporal correlation, the pre-equalization filter being further adapted to compensate for the spatial correlation when at least two antenna input streams are provided,
- at least one user-dependent receiver configured to detect the received data symbols of a given user.
Dependencies are inferred from the claim text.