Wireless communication apparatus, wireless communication system, and communication method

Patent metadata

Field	Value
Publication number	US-8995920-B2
Application number	US-201013378027-A
Country	US
Kind code	B2
Filing date	May 26, 2010
Priority date	Jun 16, 2009
Publication date	Mar 31, 2015
Grant date	Mar 31, 2015

Abstract

A wireless communication apparatus includes: a channel information acquiring unit that, acquires a transmitted signal channel matrix that is channel information as a transmitted signal of a pre-interference-removal transmitted signal group and an interference signal channel matrix that is channel information as an interference signal of the non-interference-removed transmitted signal group; an interference signal calculating unit that generates an interference signal group at the time of reception by the non-interference-removed transmitted signal group with respect to the pre-interference-removal transmitted signal group, based on the pre-interference-removal transmitted signal group, the non-interference-removed transmitted signal group, the transmitted signal channel matrix, and the interference signal channel matrix; a subtracting unit that subtracts the interference signal group from the pre-interference-removal transmitted signal group to generate a post-interference-removal transmitted signal group; and a transmission antenna group that transmits the post-interference-removal transmitted signal group and the non-interference-removed transmitted signal group from mutually different transmission antennas.

First claim

The invention claimed is:

1. A wireless communication apparatus comprising:
a channel information acquiring unit that, based on a received signal, acquires a transmitted signal channel matrix that is channel information as a transmitted signal of a pre-interference-removal transmitted signal group and an interference signal channel matrix that is channel information as an interference signal of the non-interference-removed transmitted signal group;
an interference signal calculating unit that generates an interference signal group at the time of reception by the non-interference-removed transmitted signal group with respect to the pre-interference-removal transmitted signal group, based on the pre-interference-removal transmitted signal group, the non-interference-removed transmitted signal group, the transmitted signal channel matrix, and the interference signal channel matrix;
an interference signal subtracting unit that subtracts the interference signal group from the pre-interference-removal transmitted signal group to generate a post-interference-removal transmitted signal group; and
a transmission antenna group that transmits the post-interference-removal transmitted signal group and the non-interference-removed transmitted signal group from mutually different transmission antennas.

2. The wireless communication apparatus according to claim 1 , further comprising:
a modulo unit in which each signal of the post-interference-removal transmitted signal group is divided by a modulo width that is a pre-established constant and determines the remainder to generate a power-suppressed transmitted signal group;
wherein the transmission antenna group transmits a power-suppressed transmitted signal group and the non-interference-removed transmitted signal group from mutually different transmission antennas.

3. A wireless communication apparatus comprising:
a plurality of antennas that receive a post-interference-removal transmitted signal group and a non-interference-removed transmitted signal group;
a post-interference-removal desired transmitted signal group decoding unit that decodes the desired signal with respect to the received post-interference-removal transmitted signal group to generate a desired signal estimated value group;
a replica generating unit that calculates an estimated value of an interference signal of the post-interference-removal transmitted signal group with respect to the non-interference-removed transmitted signal group from the desired signal estimated value group;
a replica subtracting unit that subtracts a estimated value of the interference signal from the received the non-interference-removed transmitted signal group to generate a post-replica-subtracted signal group; and
a non-interference-removed desired transmitted signal group decoding unit that decodes the desired signal with respect to the post-replica-subtracted signal group.

4. The wireless communication apparatus according to claim 3 wherein
the plurality of antennas receives the power-suppressed transmitted signal group and the non-interference-removed transmitted signal group;
the post-interference-removal desired transmitted signal group decoding unit calculates, based on an amplitude of the received power-suppressed transmitted signal group, a shift amount by a remainder operation that is performed with respect to the power-suppressed transmitted signal group to generate a desired signal estimated value group using the shift amount; and wherein
the replica generating unit generates a replica signal group of the interference components of the power-suppressed transmitted signal group with respect to the non-interference-removed transmitted signal group from a shift amount by the remainder operation that is performed with respect to the desired signal estimated value group and the power-suppressed transmitted signal group.

5. A wireless communication system comprising a transmitting-side communication apparatus for a desired signal and a receiving-side communication apparatus for a desired signal, wherein
the transmitting-side communication apparatus for a desired signal comprising:
a channel information acquiring unit that, based on the received signal, acquires a transmitted signal channel matrix that is channel information as a transmitted signal of a pre-interference-removal transmitted signal group and an interference signal channel matrix that is channel information as an interference signal of the non-interference-removed transmitted signal group;
an interference signal calculating unit that generates an interference signal group at the time of reception by the non-interference-removed transmitted signal group with respect to the pre-interference-removal transmitted signal group, based on the pre-interference-removal transmitted signal group, the non-interference-removed transmitted signal group, the transmitted signal channel matrix and the interference signal channel matrix;
an interference signal subtracting unit that subtracts the interference signal group from the pre-interference-removal transmitted signal group to generate a post-interference-removal transmitted signal group; and
a transmission antenna group that transmits the post-interference-removal transmitted signal group and the non-interference-removed transmitted signal group from mutually different transmission antennas; and
a receiving-side communication apparatus for a desired signal comprising: a plurality of antennas that receive a post-interference-removal transmitted signal group and a non-interference-removed transmitted signal group;
a post-interference-removal desired-transmitted signal group decoding unit that decodes the desired signal with respect to the received post-interference-removal transmitted signal group to generate a desired signal estimated value group;
a replica generating unit that calculates an estimated value of an interference signal of the post-interference-removal transmitted signal group with respect to the non-interference-removed transmitted signal group from the desired signal estimated value group;
a replica subtracting unit that subtracts a estimated value of the interference signal from the received the non-interference-removed transmitted signal group to generate a post-replica-subtracted signal group; and
a non-interference-removed desired transmitted signal group decoding unit that decodes the desired signal with respect to the post-replica-subtracted signal group.

6. The wireless communication system according to claim 5 , the transmitting-side communication apparatus for a desired signal further comprising:
a modulo unit in which each signal of the post-interference-removal transmitted signal group is divided by a modulo width that is a pre-established constant and determines the remainder to generate a power-suppressed transmitted signal group; and
in which the transmission antenna group transmits the power-suppressed transmitted signal group and the non-interference-removed transmitted signal group from mutually different transmission antennas; and wherein
in the receiving-side communication apparatus for a desired signal,
the plurality of antennas receives power-suppressed transmitted signal group and the non-interference-removed transmitted signal group;
the post-interference-removal desired transmitted signal group decoding unit calculates, based on an amplitude of the received power-suppressed transmitted signal group, a shift amount by a remainder operation that is performed with respect to the power-suppressed transmitted signal group to generate a desired signal estimated value group, using the sift amount; and wherein
the replica generating unit generates a replica signal group of the interference components of the power-suppressed transmitted signal group wit

Assignees

• Hirata Kozue
• Onodera Takashi
• Nakano Hiroshi
• Kubota Minoru
• Okamoto Naoki
• Sharp Kk

Inventors

• Hirata Kozue
• Onodera Takashi
• Nakano Hiroshi
• Kubota Minoru
• Okamoto Naoki

Classifications

• H04L25/03343

  Arrangements at the transmitter end · CPC title

• H04L2025/03414

  Multicarrier · CPC title

• H04B1/7107

  Subtractive interference cancellation · CPC title

• H04L25/03286

  with channel-decoding circuitry · CPC title

• H04L1/0048

  in conjunction with detection of multiuser or interfering signals, e.g. iteration between CDMA or MIMO detector and FEC decoder (for spatial equalizer H04L25/03286) · CPC title