US 7,680,458 B2 · Interference cancellation method and module for OFDMA mobile communication system

Abstract

The present invention relates to an interference cancellation receiving method in an OFDMA mobile communication system, and an apparatus using the same. For this purpose, the present invention provides an interference cancellation receiving method for outputting a data symbol from which an interfering signal is canceled by receiving subcarriers including a data signal from a serving base station, the data signal including interfering signals from a neighboring base station and a remote base station, estimating a channel response of the serving base station and the neighboring base station by using at least one adjacent pilot subcarrier in the frequency axis or time axis, computing a weight value for canceling the interfering signals, and combining at least one data subcarrier having a repeated identical data symbol among received subcarriers with the weight value. According to the present invention, performance of receiving serving base station signals is improved, and a success rate of handoff is increased and handoff delay time is reduced by successful decoding of signals from a serving base station and a neighboring base station when handoff occurs.

Claims24

Dependent claims

A method for a mobile station to cancel an interfering signal from a neighboring base station, the method comprising:

(a) receiving subcarriers that contains data signal from a serving base station, wherein the data signal includes interfering signals from a neighboring base station and a remote base station;
(b) estimating channel responses of the serving base station and the neighboring base station by using at least one pilot subcarrier among adjacent pilot subcarriers on the frequency axis or the time axis;
(c) computing weight values for canceling the interfering signals from repeated data subcarriers by using the estimated channel response;
and
(d) obtaining a data symbol from which the interfering signal is cancelled by combining at least one data subcarrier among the received subcarriers with the weight value, the at least one data subcarrier having a repeated identical data symbol.

2 more elements

An interference cancellation receiving method for canceling interference from a neighboring base station when a mobile station receives a data signal from a serving base station where two transmit antennas are used and a transmit antenna diversity is applied, the interference cancellation receiving method comprising:

(a) receiving subcarriers including a data signal from the serving base station, the data signal including interfering signals from the neighboring base station and a remote base station;
(b) estimating a channel response for each transmit antenna of the serving base station and the neighboring base station by using at least one adjacent pilot subcarrier on the frequency axis or time axis among the subcarriers;
(c) computing a weight value for performing interference cancellation on a received symbol of each transmit antenna by using the channel response estimated for each transmit antenna;
and
(d) obtaining a conjugate of a received symbol received at one transmit antenna, and combining at least one data subcarrier having the same data symbol by using the weight value, to generate a data symbol from which the interference is cancelled.

2 more elements

An interference cancellation receiving apparatus for a mobile station to cancel an interfering signal from a neighboring base station, the interference cancellation receiving apparatus comprising:

a receive antenna for receiving subcarriers that include a data signal from a serving base station, the data signal including the interfering signal from the neighboring base station;
a fast Fourier transform (FFT) module for dividing the received subcarriers into a pilot subcarrier and a data subcarrier;
a joint channel estimation (JCE) module for receiving the pilot subcarrier from the FFT module and estimating a channel response of the serving base station and the neighboring base station;
a weight value computation module for receiving the channel response and computing a weight value for the interference cancellation;
and
a joint symbol detection (JSD) module for receiving the weight value from the weight value computation module and outputting the data symbol from which the interference is canceled.

3 more elements

Dependencies are inferred from the claim text.

Interference cancellation method and module for OFDMA mobile communication system

Life of this patent

Interference cancellation method and module for OFDMA mobile communication system

Life of this patent

Abstract

Claims24