Abstract:
Provided are an apparatus and a method for detecting a bit sequence, comprising the steps of selecting survivor states of a present level comprising a relatively high occurrence rate by using selection metrics for state-pairs of the calculated states based on parameters to be used to determine a probability distribution of a present receiving signal estimated in each of the states comprising a present transmission bit and a previous transmission bit; additionally removing any one of the states from the states selected in a previous level based on the latest received bit symbol included in the selected survivor states; and detecting the bit sequence based on the path to the survivor states reflecting the situation of which any one state has been additionally removed.
Abstract:
Provided are a power reduction method of a multi-path receiver including multi-receiver units, which controls power gating or clock gating of the multi-receiver units based on a synchronization state detected from respective multi-receiver units receiving signals, and a multi-path receiver therefor.
Abstract:
PURPOSE: A symbol detection method is provided to increase an OOK(On-Off Keying) symbol detection performance or a PPM(Pulse Position Modulation) performance in a receiver including a plurality of reception antennas. CONSTITUTION: A synchronizer(451) executes time synchronization for each of paths by using preambles corresponding to two or more antennas. Header detectors(471,472) detect a header in each of the paths. A survival path selector(480) selects one or more survival path based on the preamble or the header. A combiner(493) combines signals on the one or more survival paths for demodulating payload. [Reference numerals] (421,422) Envelope detector; (451,452) Synchronizer; (461,462) Parameter calculator; (471,472) Header detector; (480) Survival path selector; (491,492) Signal compensator; (493) Combiner; (494) Determiner; (AA) Survival path; (BB) Demodulator
Abstract:
PURPOSE: A memory device and a memory data reading method for MLC and MBC are provided to reduce time for search reading voltage level and read from the memory device by using writing voltage level. CONSTITUTION: A memory device(100) includes a memory cell array(110), a reading unit(120), and a controller(130). The memory cell array includes memory cells. The reading unit reads data from the memory cell array and uses the first reading voltage level. The reading unit produces the first index information based on data. The controller reads the second index information stored in the memory cell array.
Abstract:
A memory device and a memory data read method are provided to reduce an error in reading data by applying a new multi-level reading method to the multi-level cell memory. A memory device(200) comprises a multi bit cell array(210), a determination unit(220), and a buffer memory(230). The determination unit divides the multi bit cells of a memory page within the multi bit cell array into the first group and the second group, and the first group is composed of the multi bit cells having the higher threshold voltage than the reference voltage. The second group is composed of the multi bit cells having the lower-threshold voltage than the reference voltage. The determination unit updates the first and the second group through the change of the reference voltage. The buffer memory stores data about the multi bit cells of the first group and the second group.
Abstract:
PURPOSE: An apparatus and a method for demodulating a PDCCH(Packet Data Control CHannel) and a PDCH(Packet Data CHannel) in an MS(Mobile Station) of a mobile communication system are provided to efficiently demodulate an F(Forward)-PDCH when the F-PDCH and an F-PDCCH exist in a high-speed packet data communication system. CONSTITUTION: An F-PDCH demodulation operation control unit checks whether a CRC(Cyclic Redundancy Check) good packet exists among four F-PDCCH decoding results inputted from an F-PDCCH decoding result selecting unit(702). If the CRC good packet does not exist among the four F-PDCCH decoding results, the F-PDCH demodulation operation control unit generates an F-PDCH stop signal(704). If the CRC good packet exists among the four F-PDCCH decoding results, the F-PDCH demodulation operation control unit checks whether an F-PDCCH sequence is '000000XXXXX11'(706). If the F-PDCCH sequence is not '000000XXXXX11' and is a message indicating information about an F-PDCH, the F-PDCH demodulation operation control unit confirms whether a MAC_ID(Medium Access Control_Identification) received in an MS is an ID assigned in the MS(710). If the MAC_ID is not the ID of the MS, the F-PDCH demodulation operation control unit sets an F-PDCH stop signal as '1' and outputs the F-PDCH stop signal(712). If the MAC_ID is the ID of the MS, the F-PDCH demodulation operation control unit checks a received SP_ID(Sub-Packet_ID) value(714). If the SP_ID is 0, the F-PDCH demodulation operation control unit checks a standby SP_ID value and checks whether a current standby packet is a new packet in which the SP_ID is 0(716). If the standby SP_ID is 0, the F-PDCH demodulation operation control unit performs a normal operation(718). If the standby SP_ID is not 0, the F-PDCH demodulation operation control unit clears one corresponding to a received ARQ_ID among F-PDCH subpacket n QCTC(Quasi Complementary Turbo Code) buffers and performs the normal operation(720).
Abstract:
PURPOSE: An apparatus and a method for transmitting packet data in a fast packet data transfer mobile communication system are provided to transmit common packet channel preamble from the fast packet data transfer mobile communication system, thereby preventing lowering of the receipt quality of a packet channel due to distortion of a receiving signal level generated whether the packet channel is discontinuously transmitted. CONSTITUTION: A packet data transmitter transmits packet data to a packet data channel. A preamble signal generator transmits a preamble signal according to a gain of the packet data channel. A selection signal generator generates a selection signal for transmitting the preamble signal prior to the packet data transmission point when the data transmission is started. A multiplexer outputs the preamble signal according to the selection signal. In case that the multiplexer receives no selection signal, the multiplexer time-divides and outputs the packet data.
Abstract:
PURPOSE: An apparatus and a method for measuring an SIR(Signal-to-Interference Ratio) in a mobile communication system are provided to simply measure the SIR by storing receiving signal data in an off-line memory and successively calculating the SIR about each PN(Pseudo Noise) code offset included in an active set. CONSTITUTION: An off-line memory(203) stores received data in a real time, and outputs the received data with a predetermined uniform time quantity according to an external reading command. An SIR measuring unit(205) changes an external PN code offset through a command using the received data outputted from the off-line memory(203), and successively measures an SIR of a pilot channel and an SIR of a packet data channel as to each transmitter in an active set. A controller(207) provides the reading command to the off-line memory(203), provides a PN code offset value to the SIR measuring unit(205), gathers the measured result of the SIR measuring unit(205), and selects a transmitter having the maximum SIR of the packet data channel.
Abstract:
PURPOSE: An ON-OFF key receiving signal detecting apparatus and method in a mobile communication system of CDMA are provided to detect an accurate symbol by detecting a symbol of an ON-OFF key receiving signal by using a variable critical value determined by a channel estimation energy for a reference signal experiencing the same channel as a paging indicator signal. CONSTITUTION: An ON-OFF key receiving detector computes a symbol energy of a paging indicator signal which has passed a channel(610). The computation operation may be operations such as a back diffusion for the receiving signal, a symbol accumulation and a phase compensation. The ON-OFF key receiving signal detector computes an energy of a reference signal which passes the same channel(620). At this time, the reference signal is a signal which the receiver already recognizes its amplitude, for which a common channel signal may be used. The ON-OFF key receiving signal detector determines a symbol detection critical value by using the reference signal energy(630). At this time, the determining operation may be an operation of multiplying a reference signal energy by a predetermined gain to convert the magnitude of the reference signal energy. The ON-OFF key receiving signal detector detects a symbol of the paging indicator signal according to the determined symbol detection critical value. This is possibly performed by comparing the energy of the paging indicator signal with the symbol detection critical value.
Abstract:
불휘발성메모리장치및 그제조방법에관해개시되어있다. 셀영역에형성되어터널링산화막으로사용되는게이트절연막을질화된산화막으로형성하되, 주변회로영역에형성되는트랜지스터의게이트절연막을이보다먼저형성하여셀 영역에질화된산화막으로게이트절연막을형성시주변회로영역의게이트산화막을옥시나이트라이드막등으로전환시킨다. 이와같은방법으로셀 영역에질화된산화막을형성하면주변회로부에형성되는트랜지스터를특성저하없이형성할수 있다. 또한, 주변회로영역에서게이트절연막을정상적으로성장시킬수 있고, 기판과게이트절연막의본딩이약화되는것과전하의트랩핑사이트(trapping sites) 및게이트절연막사이의불균일성장이증가되는것을방지할수 있다.