Wireless Receiving Apparatus, Wireless Transmitting Apparatus, and Interference Signal Removing Method
A wireless receiving apparatus capable of efficiently removing interference signals in a multicarrier communication. In a mobile station ( 200 ) incorporating this wireless receiving apparatus, a selecting part ( 205 ) selects a plurality of the same symbols in accordance with a mapping pattern established at the time of generating OFDM symbols in a base station. A correlation value calculating part ( 207 ) determines correlation values between the subcarriers of the same symbols to generate an R-matrix, and further determines an inverse matrix of the R-matrix. An MMSE processing part ( 208 ) performs an MMSE processing to determine a weight (W) from both a P-vector received from a channel estimating part ( 206 ) and the inverse matrix of the R-matrix received from the correlation value calculating part ( 207 ). Multipliers ( 209 - 1 to 209 -N) multiply each of the symbols selected by the selecting part ( 205 ) by the weight determined by the MMSE processing part ( 208 ). A combining part ( 210 ) combines the symbols as multiplied by the weight.
1 . A radio receiving apparatus comprising:
a receiving section that receives a multicarrier signal including a plurality of subcarriers on which a plurality of same symbols are mapped; and
an interference cancellation section that cancels an interference signal from the multi carrier signal using the plurality of same symbols.
2 . The radio receiving apparatus according to claim 1 , wherein the interference cancellation section comprises:
a correlation value calculating section that calculates cross-correlation values between the plurality of same symbols and generates a first matrix comprised of the cross-correlation values;
a weight calculating section that calculates weights for the plurality of same symbols by matrix operation using an inverse matrix of the first matrix and a second matrix comprised of channel estimation values for the plurality of subcarriers; and
a combining section that combines the plurality of same symbols multiplied by the weights to cancel the interference signal.
3 . The radio receiving apparatus according to claim 1 , comprising the plurality of interference cancellation sections,
wherein the plurality of interference cancellation sections each perform a divided potion of the matrix operation.
4 . The radio receiving apparatus according to claim 1 , wherein the interference cancellation section cancels the interference signal in a space domain in a first step, and cancels the interference signal in a frequency domain in a second step.
5 . A radio transmitting apparatus that transmits the multicarrier signal including the plurality of subcarriers to the radio receiving apparatus according to claim 1 , the radio transmitting apparatus comprising:
a repetition section that repeats a symbol to generate the plurality of same symbols; and
a generating section that maps in the frequency domain the plurality of same symbols onto the plurality of subcarriers, using a same mapping pattern as a mapping pattern for a symbol of the interference signal on at least M+1 subcarriers (where M is the number of interference signal sources) of the plurality of subcarriers to generate the multicarrier signal.
6 . The radio transmitting apparatus according to claim 5 , further comprising a plurality of antennas that transmit the plurality of multicarrier signals.
7 . A radio communication mobile station apparatus comprising the radio receiving apparatus according to claim 1 .
8 . A radio communication mobile station apparatus comprising the radio transmitting apparatus according to claim 5 .
9 . A radio communication base station apparatus comprising the radio receiving apparatus according to claim 1 .
10 . A radio communication base station apparatus comprising the radio transmitting apparatus according to claim 5 .
11 . An interference signal cancellation method in multicarrier communication, the method comprising canceling an interference signal included in a multicarrier signal by using a plurality of subcarriers on which a plurality of same symbols are mapped as a plurality of antennas in AAA technique and by performing MMSE processing on the plurality of same symbols in a frequency domain.