Intercell Interference Reduction
AssigneeTelefonaktiebolaget L M Ericsson (publ)
InventorPeter Larsson
Life of this patent
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Abstract
A distributed antenna system based wireless cellular communication system with transmit side linear interference cancellation is described. In this system the effective complex channel elements (I) and (II) are estimated and reported by mobile station MS1 and MS2, respectively, to a transmit weight matrix processing apparatus (20). Processing apparatus (20) uses the effective complex channel matrix (one row reported by each mobile station) to differentially update the transmit weight matrix used for the transmit side linear interference cancellation.
Claims16
A method of downlink interference suppression for distributed antenna system based wireless cellular communication with transmit side linear interference cancellation, including the steps of
- determining (S1) effective complex channel matrix estimates;
- differentially updating (S2) a complex transmit weight matrix based on the determined estimates.
A distributed antenna system based wireless cellular communication system with transmit side linear interference cancellation, including
- means (40-48) adapted to determine effective complex channel matrix estimates;
- means (20) adapted to differentially update a complex transmit weight matrix based on the determined estimates.
A transmit weight matrix processing method for distributed antenna system based wireless cellular communication with transmit side linear interference cancellation, including the steps of
- determining (S10) the inverse of an effective complex channel matrix from estimates of an effective complex channel matrix reported by mobile stations;
- updating (S11) a differential update matrix based on the determined inverse of the effective complex channel matrix;
- differentially updating (S12) a complex transmit weight matrix based on the updated differential update matrix.
A transmit weight matrix processing apparatus for a distributed antenna system based wireless cellular communication system with transmit side linear interference cancellation, including
- an inverter (22) adapted to determine the inverse of an effective complex channel matrix from estimates of the effective complex channel matrix reported by mobile stations;
- a differential update matrix forming unit (26) adapted to update a differential update matrix based on the determined inverse of the effective complex channel matrix;
- a transmit weight matrix update unit (28) adapted to differentially update a complex transmit weight matrix based on the updated differential update matrix.
A channel estimate reporting method in distributed antenna system based wireless cellular communication with transmit side linear interference cancellation, including the steps of
- receiving (S20) pilot signals from different cells of the wireless cellular communication system at a mobile station;
- estimating (S21) elements of an effective complex channel matrix (E) based on the received pilot signals;
- reporting (S22) at least selected estimated elements on an uplink.
A mobile station for a distributed antenna system based wireless cellular communication system with transmit side linear interference cancellation, including
- means (40, 42) adapted to receive pilot signals from different cells of the wireless cellular communication system;
- means (44, 46) adapted to estimate elements of an effective complex channel matrix (E) based on the received pilot signals;
- means (48) adapted to report at least selected estimated elements on an uplink.
Dependencies are inferred from the claim text.