Abstract:
PURPOSE: A communication method of a relay network is provided to show high reliability and performance in the relay network. CONSTITUTION: A relay network comprises a source node, a first relay node, a second relay node, and a destination node. The source node broadcasts a polarized information orthogonal frequency division multiplexing (OFDM) block to each of the first node and the second node (S410). The first relay node processes the broadcasted OFDM block (S420). The second relay node processes the broadcasted OFDM block (S430). The first relay node transmits the processed OFDM block to the destination node (S440). The second relay node transmits the processed OFDM block to the destination node (S450). [Reference numerals] (AA) Start; (BB) End; (S410) Source node broadcasts a polarized information orthogonal frequency division multiplexing (OFDM) block to each of the first node and the second node; (S420) Relay node processes the broadcasted OFDM block; (S430) Second relay node processes the broadcasted OFDM block; (S440) Relay node transmits the processed OFDM block to the destination node; (S450) Second relay node transmits the processed OFDM block to the destination node; (S460) Destination node decodes OFDM blocks received from first and second relay nodes; (S470) OFDM blocks decoded from destination node decodes are depolarized
Abstract:
PURPOSE: Method and system including eight antennas for providing an up-down polar relay network are provided to enable two or more relay nodes to transmit the received information OFDM(Orthogonal Frequency Division Multiplexing) symbol to a destination node by enabling a source node to broadcast the OFDM symbol to two or more relay nodes. CONSTITUTION: A source node(110) polarizes an information OFDM symbol. The source node broadcasts the polarized information OFDM symbol. Two or more relay nodes(120,125) transmit the received information OFDM symbol to a destination node. An SIC(Successive Iterative Cancellation) decoder(130) decodes the information OFDM symbol transmitted to the two or more relay nodes. The two or more relay nodes transmit the decoded information OFDM symbol to the destination node.
Abstract:
PURPOSE: An iterative decoding method and a device thereof are provided to use a function for ordering and cancelling interference, thereby enhancing decoder performance. CONSTITUTION: An LLR calculating unit calculates a channel log-likelihood ratio about a fixed input signal. A deinterleaver(420_1~420_M) de-interleaves a channel log-likelihood ratio value outputted from the LLR calculating unit. A decoding unit(430) iteratively decodes the calculated LLR value to estimate data which is transmitted from a source node. An interleaver(440_1~440_M) changes the input order of an input information bit. An update unit(450) updates an LLR value which is calculated by the LLR calculating unit.
Abstract:
A QPSK differential space time coding apparatus using a different unitary matrix set is provided to reduce interference between adjacent channels and to minimize fading of a transmitting signal by using two transmission antennas and one reception antenna. A unitary matrix selection unit(120) corresponds to a transmission channel with respect to a QPSK signal for transmission. A multiplier unit(140) performs a multiplying process for an output of the unitary matrix selection unit, an initial matrix, and a feedback signal. A delay unit(150) delays a signal. A transmission matrix unit(160) assigns an output of the multiplier unit to each of antennas. A transmission/reception apparatus performs a differential modulation process by selecting the unitary matrix corresponding to a dual channel type from a plurality of unitary matrix sets.
Abstract:
신호 전송의 양과 질에서 정보 이론적 극한이 반영된 MMSE 필터링 장치 및 방법이 제공된다. 본 발명의 실시예에 따른 필터링 방법은, 원 신호와 필터링된 신호의 최소 평균 자승 오차를 최소화하는 필터 계수를 이용하여 수신 신호를 필터링한다. 이에 의해, 신호 전송의 양과 질에서 정보 이론적 극한이 반영된 MMSE 필터링이 가능해짐으로서, 신호 처리, 복원 등의 성능을 향상시킬 수 있게 된다.
Abstract:
Provided are a precoding method using a diagonal jacket matrix in a MIMO broadcast channel and a communications system using the same. A communications method according to an embodiment of the present invention pre-codes a signal through an interference alignment (IA) method and a multi-user multi-output (MIMO) beam forming. Transmission/reception performance is improved by solving a problem of a multi-cell multi-user common channel by removing and managing all the interference in inter-cell and inter-user under a multi-user multi-cell interference environment.
Abstract:
수신기 및 이를 적용한 무선 네트워크 시스템이 제공된다. 본 수신기는, NOT 게이트 및 OR 게이트를 이용하여 간섭 신호를 제거할 수 있게 되어, 간섭 제거가 강화된 합-전송률을 나타내게 된다. 따라서, 이와 같은 방법을 이용할 경우 노이즈를 포함하는 간섭을 완전하게 제거할 수 있게 된다.
Abstract:
다수의 안테나 어레이들을 이용한 샘플 고유치 기반의 신호 검출 방법 및 이를 적용한 통신 시스템이 제공된다. 본 발명의 실시예에 따른 신호 검출 방법은, 다수의 안테나 어레이들을 통해 신호를 수신하고, 수신 신호 및 신호 공분산 행렬과 가우시안 신호 벡터를 이용하여 채널을 추정하며, 추정된 채널을 이용하여 신호를 검출한다. 이에 의해, 신호 검출 성능을 향상시킬 수 있음은 물론, 샘플의 개수가 증가할 때에도 Sum Rate가 우수하고, SEP가 감소되는 유리한 효과를 제공한다.