Apparatus and method for bidirectional relaying in a relay wireless communication system
AssigneesSamsung Electronics Co., Ltd., Korea Advanced Institute of Science and Technology
InventorsTak-Ki Yu, Eun-Seok Ko, Yu-Seok Kim, Joo-Hwan Chun, Hyun-Jong Yang
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Abstract
An apparatus for use in a relay wireless communication system is capable of bidirectional relaying with precoding. A Base Station (BS) includes a plurality of antennas. The BS can receive a relay signal that includes a transmit symbol vector of the BS and a transmit symbol vector of a Mobile Station (MS) from a Relay Station. The BS determines power difference values corresponding to all of symbol vectors available as the transmit symbol vector of the MS. The BS further determines the transmit symbol vector of the MS or per bit Log Likelihood Ratios using the power difference values.
Claims30
An operating method of a Base Station (BS) which comprises a plurality of antennas in a relay wireless communication system, the method comprising:
- receiving a relay signal comprising a transmit symbol vector of the BS and a transmit symbol vector of a Mobile Station (MS) from a Relay Station (RS);
- determining power difference values corresponding to all of symbol vectors available as the transmit symbol vector of the MS;
- and
- determining the transmit symbol vector of the MS or per bit Log Likelihood Ratios (LLRs) using the power difference values,
- wherein the power difference value indicates a difference value between a transmit signal power of the BS extracted from a received signal using an estimation value of the transmit symbol vector of the MS, and a transmit signal power of the BS.
An operating method of a Relay Station (RS) which comprises a plurality of antennas in a relay wireless communication system, the method comprising:
- determining a precoding matrix for a relay signal;
- determining relay power coefficients for a Base Station (BS) and a Mobile Station (MS) respectively;
- generating the relay signal by summing a product of a transmit symbol vector of the MS, the precoding matrix, and the relay power coefficient of the MS and a product of a transmit symbol vector of the BS and the relay power coefficient of the BS;
- and
- transmitting the relay signal to the BS and the MS at the same time.
An operating method of a Mobile Station (MS) in a relay wireless communication system, the method comprising:
- receiving a relay signal which comprises a transmit symbol vector of a Base Station (BS) and a transmit symbol vector of the MS from a Relay Station (RS);
- determining a coupling matrix using a channel matrix between the RS and the MS;
- diagonalizing an effective channel using the coupling matrix;
- and
- detecting the transmit symbol vector of the BS by removing the effective channel component.
An apparatus of a Base Station (BS) which comprises a plurality of antennas in a relay wireless communication system, the apparatus comprising:
- a plurality of receivers configured to receive a relay signal comprising a transmit symbol vector of the BS and a transmit symbol vector of a Mobile Station (MS) from a Relay Station (RS);
- and
- a detector configured to determine power difference values corresponding to all of symbol vectors available as the transmit symbol vector of the MS, and determine the transmit symbol vector of the MS or per bit Log Likelihood Ratios (LLRs) using the power difference values,
- wherein the power difference value is configured to indicate a difference value between a transmit signal power of the BS extracted from a received signal using an estimation value of the transmit symbol vector of the MS, and a transmit signal power of the BS.
An apparatus of a Relay Station (RS) that comprises a plurality of antennas in a relay wireless communication system, the apparatus comprising:
- a calculator configured to determine a precoding matrix for a relay signal;
- a processor configured to determine relay power coefficients for a Base Station (BS) and a Mobile Station (MS) respectively, and generate the relay signal by summing a product of a transmit symbol vector of the MS, the precoding matrix, and the relay power coefficient of the MS and a product of a transmit symbol vector of the BS and the relay power coefficient of the BS;
- and
- transmitters configured to transmit the relay signal to the BS and the MS at the same time.
An apparatus of a Mobile Station (MS) in a relay wireless communication system, the apparatus comprising:
- a plurality of receivers configured to receive a relay signal that comprises a transmit symbol vector of a Base Station (BS) and a transmit symbol vector of the MS from a Relay Station (RS);
- and
- a detector configured to determine a coupling matrix using a channel matrix between the RS and the MS, diagonalize an effective channel using the coupling matrix, and detect the transmit symbol vector of the BS by removing the effective channel component.
Dependencies are inferred from the claim text.