Abstract:
PURPOSE: A data transmission and reception device in a communication system and a method thereof are provided to normally transmit and receive massive data with a MU-MIMO(Multi User-Multi Input Multi Output) method. CONSTITUTION: A station receives a frame including the group information of the stations transmitting receiving the data with a MU-MIMO method from an AP(Access Point)(810). The station confirms a group ID(Identity) assigned to the station(820). The station transmits the received frame to an AP(Access Point) included in other mesh network and transmit and receive the data with the AP in a MU-MIMO device based on the group information of the stations(830). [Reference numerals] (810) Frame reception; (820) Group ID confirmation; (830) Data transmission; (AA) Start; (BB) End
Abstract:
PURPOSE: A data transmission and reception device in a communication system and a method thereof are provided to implement data transmission and reception through an MU-MIMO(Multi User Multi Input Multi Output) method between the stations by transmitting and receiving a frame including group information. CONSTITUTION: A random station receives the group information of candidate terminals from an AP(Access Point) through a corresponding frame. The frame includes non-high throughput, VHT(Very High Throughput), a preamble(202), an MAC(Medium Access Control) header(204), a frame body(206), and an FCS(Frame Check Sequence)(224). The random station individually transmits the random station and the group information to the candidate terminals. The random station transmits and receives data with the candidate terminals with the MU-MIMO method.
Abstract:
본 발명은, 무선 랜(WLAN: Wireless Local Area Network) 통신 시스템에서 다수의 채널을 이용하여 데이터의 전송 효율을 향상시키기 위한 자원 할당 장치 및 방법에 관한 것으로, 다수의 가용 채널들 중에서, 연속적(contiguous) 또는 비연속적인(non-contiguous) 복수의 채널을 하나의 서브채널 그룹(sub-channel group)으로 미리 설정하거나, 특정 패턴이나 또는 임의적으로 복수의 채널을 하나의 서브채널 그룹으로 미리 설정하거나, 쌍(pair)으로 또는 소정 개수로 그룹핑한 후 특정 패턴이나 또는 임의적으로 복수의 채널을 하나의 서브채널 그룹으로 미리 설정하는 설정부; 및 단말로부터의 채널 할당 요청에 따라 해당하는 상기 단말에 상기 미리 설정된 서브채널 그룹을 할당하는 할당부를 포함한다. 무선 랜, Wireless LAN, 자원할당
Abstract:
PURPOSE: A method and an apparatus for transmitting a data block in a wireless communication system are provided to prevent the decoding performance of a receiver from being decreased by preventing adjacent bits in an encoding block from consecutively having the same reliance on signal constellation. CONSTITUTION: A coded block is generated by an encoding information bit(S910). Encoding includes space mapping by a stream parser along with an FEC(Forward Error Correction) encoding such as BCC(Binary Convolution Code) or LDPC(low-density parity-check). Segment parsing is performed by a first segment unit(S920). The presence of extra bits is determined(S930). An M number of frequency sub blocks is parsed for the extra bits by a second segment unit(S940). Each sub block is transmitted to a receiver(S950). A parsed sub block is independently interleaved by an interleaver. An interleaved sub block is mapped on the signal constellation.
Abstract:
본 발명은 다중 셀 환경에서 다수의 상이한 데이터 스트림을 수신하는 다중안테나 시스템의 수신장치 및 수신 방법에 관한 것이다. 본 발명의 송신장치로부터 다수의 상이한 데이터스트림을 수신하는 다수의 안테나를 구비하는 다중안테나 시스템의 수신장치는 상기 다수의 안테나를 통해 수신된 상기 다수의 데이터스트림 간의 간섭을 제거하여 채널 정보가 유지된 상태로 각각의 데이터스트림을 검파하는 데이터스트림 검파부; 상기 데이터스트림 검파부에 의해 검파된 상기 각각의 데이터 스트림의 상기 채널 정보를 통해 빔포밍 벡터를 산출하여 상기 송신장치로 피드백하는 빔포밍벡터산출부; 상기 데이터스트림 검파부에 의해 검파된 상기 각각의 데이터 스트림에 대하여 채널 간의 간섭을 제거하는 채널간 간섭제거부를 포함한다. 본 발명에 의하면 채널 간 간섭을 제거하고 채널 용량을 증가시킴으로써, 다이버시티 이득과 멀티플렉싱 이득을 동시에 얻을 수 있다. 다중안테나, 채널 간 간섭, OC, QRD, SQRD
Abstract:
Provided is a QR decomposition apparatus and method that can reduce the number of computers by sharing hardware in an MIMO system employing OFDM technology to simplify a structure of hardware. The QR decomposition apparatus includes a norm multiplier for calculating a norm; a Q column multiplier for calculating a column value of a unitary Q matrix to thereby produce a Q matrix vector; a first storage for storing the Q matrix vector calculated in the Q column multiplier; an R row multiplier for calculating a value of an upper triangular R matrix by multiplying the Q matrix vector by a reception signal vector; and a Q update multiplier for receiving the reception signal vector and an output of the R row multiplier, calculating an Q update value through an accumulation operation, and providing the Q update value to the Q column multiplier to calculate a next Q matrix vector.
Abstract:
본 발명은 직교주파수 분할 다중(OFDM) 방식의 MIMO 시스템에서 연산 복잡도를 낮추면서도 성능을 향상시킬 수 있는 QR 분해 장치 및 그 방법에 관한 것으로, 채널 입력에 대한 벡터 크기(norm)를 계산하는 norm 계산수단; 지연된 채널 입력과 을 곱셈하여 단일 행렬(Q) 열 값을 계산하는 Q 열 계산수단; 상기 지연된 채널 입력과 상기 Q 열 계산수단의 출력과 1/ 을 입력받아 상삼각 행렬(R)의 행 값을 계산하는 R 행 계산수단; 상기 지연된 채널 입력과 상기 R 행 계산수단의 출력과 지연된 상기 Q 열 계산수단의 출력을 입력받아 Q 갱신 행렬 값을 출력하는 Q 갱신 계산수단; 및 지연된 상기 norm 계산수단의 출력과 상기 R 행 계산수단의 출력을 입력받아 norm 갱신 행렬 값을 출력하는 norm 갱신 계산수단을 포함한다. MIMO, 다중입력, 다중출력, QR, 분해, 행렬, 채널, 추정, 갱신
Abstract:
A method for generating a parity check matrix for low complexity and high speed decoding, an encoding apparatus and method of a low density parity check code using the same are provided to use a hardware resource by correcting an existing decoding apparatus. A bit input part(510) delivers an input value to an information vector generating part(520) and a bit output part(540) within a given time. The information vector generating part generates an information vector by multiplying an input bit inputted in the bit input part to an information block of a stored parity check matrix. A parity bit generating part(530) generates a parity bit by using the information vector generated in the information vector generating part and the parity block of the parity check matrix. A bit output part generates a code word by coupling the input bit inputted from the bit input part with the parity bit generated in the parity bit generating part.
Abstract:
A QR decomposition device and a method thereof for simplifying a hardware architecture in a multi input multi-output system are provided to reduce the number of calculators by sharing a calculator when QR analysis. A norm calculating unit(503) calculates a vector size. A Q calculating unit(507) calculates a single matrix. A first storage unit(508) stores Q matrix vectors calculated by Q calculating unit. Q matrix vectors and received signal vector are multiplied by R row calculating unit(501) by multiplexing am upper-triangular matrix. The output of R row calculating unit and received signal vector is input. An update calculator(502) calculates Q update value through the accumulate operation.
Abstract:
A link adaptation method in a wireless communication system and an apparatus thereof are provided to perform efficient link adaptation and optimize various transmission parameters to a channel state, thereby increasing transmission speed, a processing amount and frequency efficiency. A measuring unit(104) measures intensity of a digital signal. A gain controller(106) controls an amplification gain in an amplifier(100). A receiving signal intensity measuring unit(108) calculates intensity of a digital signal and receiving signal intensity of a receiving terminal by using an amplification gain of the amplifier. A transmitting parameter controller(110) controls a transmitting parameter of a reverse channel packet based on receiving signal intensity of a forward channel.