Back to results
US 8,804,884 B2Granted
Method and apparatus for suppressing co-channel interference
AssigneeIntel Corporation
InventorsAlexander Alexandrovich Maltsev, Andrey Vyacheslavovich Pudeyev, Alexei Vladimirovich Davydov, Sergey Alexanderovich Tiraspolsky, Alexey Evgenievich Rubtsov
Life of this patent
Estimating the term…
Abstract
System and method for interference reduction in a broadband wireless access (BWA) network are disclosed. A mobile station performs a recursive process to update channel estimates of interfering channels on a symbol-by-symbol basis for use in canceling interference from data subcarriers received through two or more antennas.
Claims21
A mobile station that operates in presence of one or more interfering base stations comprising:
- a preamble symbol processing circuitry configured to identify one or more interfering base stations from a received preamble symbol;
- a recursive filter circuitry configured to perform a recursive filtering process using pilot subcarrier modulation sequences on pilot subcarriers of orthogonal frequency division multiple access (OFDMA) data symbols received through two or more antennas to update channel estimates on a symbol-by-symbol basis for a main channel associated with a serving base station and one or more interfering channels associated with the one or more interfering base stations for use in mitigating interference from the interfering base stations, wherein the recursive filter updates the channel estimates for the main channel and the one or more interfering channels on the symbol-by-symbol basis based on a state-space dynamic model of a channel transfer function for the main and interfering channels using signals received on the pilot subcarriers and the subcarrier modulation sequences for the main and interfering channels;
- and a filter initialization circuitry configured to generate the pilot subcarrier modulation sequences for the main channel and the one or more interfering channels based on seeds extracted from preamble identifiers transmitted by the serving base station and the one or more interfering base stations respectively, the recursive filter being initialized with channel estimates generated from the pilot subcarrier initialized with channel estimates generated from the pilot subcarrier modulation sequences, wherein the serving base station and the one or more interfering base stations use different pilot subcarrier modulation sequences for modulation of their pilot subcarriers.
A method for reducing interference from one or more interfering base stations comprising:
- identifying one or more interfering base stations from a received preamble symbol;
- performing a recursive filtering process using pilot subcarrier modulation sequences on pilot subcarrier of orthogonal frequency division multiple access (OFDMA) data symbols received through two or more antennas to update channel estimates on a symbol-by-symbol basis for a main channel associated with a serving base station and one or more interfering channels associated with the one or more interfering base stations for use in mitigating interference from the interfering base stations, wherein performing the recursive filtering comprises updating the channel estimates for the main channel and the one or more interfering channels on the symbol-by-symbol basis based on a state-space dynamic model of a channel transfer function for the main and interfering channels using signals received on the pilot subcarriers and the subcarrier modulation sequences for the main and interfering channels;
- generating the pilot subcarrier modulation sequences for the main channel and the one or more interfering channel based on seeds extracted from preamble identifiers transmitted by the serving base station and the one or more interfering base stations, respectively;
- and initializing the recursive filtering process with channel estimates generated from the pilot subcarrier modulation sequences, wherein the serving base station and the one or more interfering base stations use different pilot subcarrier modulation sequences for modulation of their pilot subcarriers.
1 more element
A non-transitory computer-readable storage medium that stores instructions for execution by one or more processors to perform operations for reducing interference from one or more interfering base stations, the operations comprising:
- identifying one or more interfering base stations from a received preamble symbol;
- performing a recursive filtering process using pilot subcarrier modulation sequences on pilot subcarriers of orthogonal frequency division multiple access (OFDMA) data symbols received through two or more antennas to update channel estimates on a symbol-by-symbol basis for a main channel associated with a serving base station and one or more interfering channels associated with the one or more interfering base stations for use in mitigating interference from the interfering base stations, wherein performing the recursive filtering comprises updating the channel estimates for the main channel and the one or more interfering channels on the symbol-by-symbol basis based on a state-space dynamic model of a channel transfer function for the main and interfering channels using signals received on the pilot subcarriers and the subcarrier modulation sequences for the main and interfering channels;
- generating the pilot subcarrier modulation sequences for the main channel and the one or more interfering channels based on seeds extracted from preamble identifiers transmitted by the serving base station and the one or more interfering base stations, respectively;
- and initializing the recursive filtering process with channel estimates generated from the pilot subcarrier modulation sequences, wherein the serving base station and the one or more interfering base stations use different pilot subcarrier modulation sequences for modulation of their pilot subcarriers.
1 more element
Dependencies are inferred from the claim text.