Abstract:
A method and an apparatus for canceling an adjacent cell interference signal in an orthogonal frequency division multiple access are provided to improve performance of a hand-over by removing an interference signal. A method for canceling an adjacent cell interference signal in an orthogonal frequency division multiple access includes the steps of: detecting an interference signal from signals received from peripheral radio stations and serving radio stations; measuring strength of the interference signal detected and checking whether the strength of the interference signal is more than a predetermined threshold value; aligning the peripheral radio stations having the interference signal whose strength is more than the predetermined threshold value; selecting and detecting the interference signal in a sequence of the peripheral radio stations to be aligned; normalizing the detected interference signal by calculating an interference and noise dispersion for the interference signal; re-generating the interference signal by decoding the normalized interference signal; and reducing the re-generated interference signal from the received signals.
Abstract:
본 발명은 직교주파수부호분할다중/부호분할다중접속 통신시스템에서 송신 다이버시티를 지원하는 것으로, 특히 적어도 2개 이상의 기지국들로부터 전송되는 동일한 방송 신호에 대하여 송신 다이버시티를 효율적으로 지원하는 장치 및 방법을 제공함에 있다. 이러한 본 발명은 무선망 제어기가 이동 단말이 위치한 무선 채널의 상황을 고려하여 적어도 2개 이상의 송신 안테나들을 구비하며 적어도 세 개의 섹터들로 구성된 하나의 셀 내에 위치한 다수의 기지국들에게 다이버시티를 구현하기 위한 정보를 전송하고, 상기 셀 내의 기지국들이 상기 정보에 따라 전송하고자 하는 데이터를 시공간 블록 부호화하고 서로 다른 순환 지연을 적용하여 적어도 2개 이상의 송신 안테나들을 통해 이동단말로 전송하는 것을 특징으로 한다.
Abstract:
A decoding apparatus and method in a BWA communication system are provided, in which an ID-based decoder controller detects an ID from a data block by partially decoding the data block, and if the ID indicates that the data block is not for the receiver, outputs a control signal commanding non-decoding for the data block, a bitmap table controller indicates the data block as a non-decoding data block in a bitmap table according to the control signal, and a decoder distinguishes data blocks to be decoded from non-decoding data blocks based on the bitmap table, decodes the data blocks to be decoded and outputs the decoded data blocks, and simply outputs the non-decoding data blocks without decoding.
Abstract:
An apparatus and method are provided for stopping iterative decoding in a channel decoder of a mobile communication system. Constituent decoding of received signals is performed and decoded signals are output. Hard decision processes for the decoded signals are performed and hard-decided signals are output. The hard-decided signals are cyclic redundancy check (CRC) encoded, and a determination is made as to whether the parities are identical and iterative decoding is stopped according to a determination result.
Abstract:
An apparatus and a method for performing decoding in a broadband wireless access communication system are provided to decode even a burst exceeding a decoding capability limit if data required to be decoded is small, to thus enhance the freedom of operation in a network system. A receiver performs normal decoding on an FEC1(Forward Error Correction 1) block(1505). A GMH(Generic MAC Header) of a DL_PDU1(Downlink_Protocol Data Unit 1) is detected by using the decoded FEC1 data(1510). A CID of the DL_PDU1 is checked to determine whether the PDU is a PDU of the receiver(1515). If the PDU is a PDU of the receiver, the receiver performs normal decoding(1520) and calculates the length of the PDU to determine whether it is a next PDU(1525). If the PDU is not a PDU of the receiver, the receiver checks whether it has such a sufficient length as to be bypassed without being decoded(1530). If the PDU has such a sufficient length as to be bypassed, the receiver sets the FEC block to be bypassed(1535).
Abstract:
A method for operating a memory in a mobile communication system is provided to remove limit of the number of bursts which are received in a minimum memory space by dynamically allocating the memory space according to bursts based on information transmitted from a MAP decoder. A method for operating a memory in a mobile communication system includes the steps of: directly transmitting the number of bursts and a length for each burst in a MAP decoder to a data receiving block(701); configuring and transmitting a burst descriptor corresponding to a burst index based on the received number of bursts and the received length for each burst to an LMAC(Low Medium Access Control); storing a MAC PDU(Packet Data Unit) in a field which indicates a storage position of the MAC PDU included in the current burst, writing 0 in a data receiving block, and setting a field of a valid burst indicator as truth by updating the LMAC to 1 if the transmission of the MAC PDU corresponding to the burst is completed(705); determining whether an F field for each burst is set as truth(707); and transmitting the MAC PDU to an upper node and setting the F field as false when the F field for each burst is set as truth(709).
Abstract:
본 발명은 데이터의 부호화에 관한 것으로, 특히 저밀도 패리티 검사(LDPC) 부호의 생성 방법 및 장치에 관한 것이다. LDPC 부호의 생성 방법은, 길이 K의 정보 시퀀스를 길이 N의 부호어로 부호화하기 위해, 검사 노드들에 대한 (NK)개의 행들과 변수 노드들에 대한 N개의 열들을 가지는 패리티 검사 행렬을 구성하는 과정과, 상기 패리티 검사 행렬을 K개의 열들을 가지는 정보 부분 행렬과 (NK)개의 열들을 가지는 패리티 부분 행렬로 분할하는 과정과, 상기 패리티 부분 행렬을 P*P의 크기를 가지는 부블록들로 분할하는 과정과, 상기 패리티 부분 행렬의 제1 대각 부분과, 상기 제1 대각 부분으로부터 부블록 천이량 f만큼 천이된 제2 대각 부분을 결정하는 과정과, 상기 제1 대각 부분과 제2 대각 부분의 부블록들에 천이 인덱스들을 가지는 천이된 단위행렬들을 각각 배치하는 과정과, 상기 제1 및 제2 대각 부분들을 제외한 나머지 부블록들을 영행렬로 채우는 과정과, 상기 패리 티 부분 행렬의 하나의 부블록 열에, 하나의 1만을 포함하고 나머지 원소들은 모두 0인 델타 행렬들을 배치하는 과정과, 상기 패리티 검사 행렬을 저장하는 과정을 포함한다. LDPC codes, Parity Check Matrices, Identity matrix, delta matrix, degree, encoding