Method and apparatus for cancellation of partially known interference using transmit diversity based interference cancellation
AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorAbdulrauf Hafeez
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Abstract
In wireless communication networks, potentially significant interference arises at a given targeted receiver because of unrelated transmissions from a neighboring, interfering transmitter. According to apparatuses and methods described and claimed herein, a first transmitter provides for cancellation of partially known interference at a targeted receiver by employing a transmit diversity based interference cancellation method, wherein it transmits diversity combinations of desired and interfering symbols. Correspondingly, the targeted receiver employs diversity combining of the received signals to cancel interference attributable to the interfering symbols.
Claims8
A method of supporting transmit diversity based interference cancellation in a receiver, the method comprising:
- determining a filter as a function of first and second channel models respectively relating the receiver to a first transmitter transmitting a transmit diversity combination signal to the receiver having desired and interfering symbol information, and relating the receiver to a second transmitter transmitting an interfering signal having the interfering symbol information;
- and
- detecting desired symbol information by applying the filter to a received signal formed as a first received signal corresponding to a first symbol period or sub-carrier in which the first transmitter transmitted a first transmit diversity combination signal formed from a first desired symbol and a second interfering symbol and the second transmitter transmitted a first interfering symbol, and as a second received signal corresponding to a second symbol period or sub-carrier in which the first transmitter transmitted a second transmit diversity combination signal formed from the first desired symbol and the first interfering symbol and the second transmitter transmitted the second interfering symbol.
For a targeted receiver, a method of supporting transmit diversity based interference cancellation by a first transmitter, the method comprising:
- determining first and second channel models respectively relating the targeted receiver to the first transmitter and to a second transmitter transmitting interfering symbols known to the first transmitter;
- determining scaling information as a function of the first and second channel models and sending the scaling information to the first transmitter to support transmit diversity based interference cancellation by the first transmitter;
- determining a filter as a function of the first and second channel models;
- receiving a first received signal in a first symbol period or sub-carrier and receiving a second received signal in a second symbol period or sub-carrier;
- said first received signal corresponding to transmission from the first transmitter of a first desired symbol and a second interfering symbol, both such symbols scaled according to the scaling information, and transmission from the second transmitter of a first interfering symbol;
- said second received signal corresponding to transmission from the first transmitter of the first desired symbol and the first interfering symbol, both such symbols scaled according to the scaling information, and transmission from the second transmitter of the second interfering symbol;
- and
- forming a diversity combination of the first and second received signal based on the filter, to thereby cancel interference attributable to the first and second interfering symbols.
A receiver circuit comprising one or more processors configured to:
- determine first and second channel models respectively relating a targeted receiver that includes the receiver circuit to first and second transmitters;
- determine scaling information as a function of the first and second channel models and send the scaling information to the first transmitter to support transmit diversity based interference cancellation by the first transmitter;
- determine a filter as a function of the first and second channel models;
- receive a first received signal in a first symbol period or sub-carrier and receiving a second received signal in a second symbol period or sub-carrier;
- said first received signal corresponding to transmission from the first transmitter of a first desired symbol and a second interfering symbol, both such symbols scaled according to the scaling information, and transmission from the second transmitter of a first interfering symbol;
- said second received signal corresponding to transmission from the first transmitter of the first desired symbol and the first interfering symbol, both such symbols scaled according to the scaling information, and transmission from the second transmitter of the second interfering symbol;
- and
- form a diversity combination of the first and second received signals based on the filter, to thereby cancel interference attributable to the first and second interfering symbols.
Dependencies are inferred from the claim text.