摘要:
The semiconductor memory device includes a data input/output unit configured to input data synchronously with a data clock and to output the data to a memory cell in response to an output strobe signal; and an output strobe signal generation unit configured to output the output strobe signal, wherein the output strobe signal is synchronized with a system clock in response to a write command regardless of whether the semiconductor memory device is in a write training mode.
摘要:
An apparatus and method for implementing SDMA in a multi-user multi-antenna system are provided, in which SDMA users are selected from among total users according to channel state information of the total users, and the number of transmission streams to be allocated to each of the SDMA users is determined by a tree search method.
摘要:
Disclosed is a method for generating feedback signal patterns of common feedback channels using cyclic shift in a multiple access system, and a transceiver therefore. A method for generating feedback signal patterns includes generating first transmission symbols by adding a cyclic prefix to transmission symbols of feedback signals, and generating second and subsequent transmission symbols by cyclically shifting the first transmission symbols and then adding the cyclic prefix.
摘要:
A retransmission apparatus and method in a wireless communication system are provided, in which it is determined whether a retransmission signal exists, when channels for transmitting signals are changed to new channels, a channel is allocated to the retransmission signal, taking into account state information about the new channels, when the retransmission signal exists, and the retransmission signal is transmitted on the allocated channel.
摘要:
A method of providing a mobile station with communication services through base station cooperation in a communication system. The method includes the steps of: receiving signals from two or more base stations; measuring a strength of each of the received signals; estimating an expected transfer rate of the mobile station; if the estimated expected transfer rate is below a predetermined reference value, selecting at least two bases stations in order of the strength of the received signal; feeding back information on the selected base stations and channel conditions thereof to a serving base station that is providing the mobile station with the communication services or to a base station that is to serve the mobile station; allocating power and resources to the mobile station by the selected base stations; and performing signal transmission/reception with the selected base stations by using the allocated power and resources.
摘要:
Provided is a coding/decoding apparatus for an orthogonal frequency division multiple access (OFDMA) communication system that takes multiple users into consideration and uses block coding/decoding scheme. In the apparatus, a mapper determines paths through which information of users will be provided, according to states of sub-channels allocated to the users. A coding/decoding unit parallel-processes the information of the users through the paths selectively connected by the mapper. The coding/decoding unit includes coders/decoders having performance lower than the maximum processing performance determined taking into account a size of a processing block and the number of sub-channels.
摘要:
An adaptive interference suppression receiver for a DS/CDMA system includes: input signal generators outputting a part of received signals of receiver antennas that has a coding block's transfer code; adaptive filter blocks filtering a complex signal output from the input signal generators with a tap weight updated based on a constraint MMSE criterion and estimating phase and amplitude components of a specific user channel using the filtering output signal to generate a channel-estimated signal; a signal restorer combining the channel-estimated signal and the filtering output signal and restoring an original signal; a signal selector for selecting known training data signal or the restored signal; and error generators comparing the channel-estimated signal and the filtering output signal and calculating an error between the two signals.
摘要:
Disclosed is a monitoring control system and method that can minimize network delay between a local side PC and a phone side PC when monitoring a mobile communication device in real time. By consecutively sending a plurality of monitoring requests for monitoring the moble communication device via the Internet, monitoring the mobile communication device and consecutively receiving a plurality of monitoring results corresponding to the plurality of monitoring requests via the Internet, real time monitoring of the mobile communication device is facilitated with minimized delay.
摘要:
In a mobile communication system and a broadcasting system, an Advanced Base Station (ABS) periodically broadcasts a buffering data packet of broadcast buffering content in providing a Mobile Internet Protocol TeleVision (Mobile IPTV) service. The broadcast buffering content represents content in which a buffering data packet corresponding to a predetermined buffering capacity is periodically broadcasted, and the buffering data packet represents a data packet that is transmitted to be buffered in advance before the broadcast buffering content is actually provided to Advanced Mobile Stations (AMSs).
摘要:
An apparatus and method for performing Peer-to-Peer (P2P) communication in a broadband wireless communication system are provided. The apparatus includes a first calculator for calculating a maximum Transmit (Tx) power level for each band of a Mobile Station (MS) by using channel information and capability information of the MS; a second calculator for calculating a preference for each band of the MS by using information on the maximum Transmit (Tx) power level for each band and by using interference information for each band of a counterpart MS; and a selector for selecting a P2P transmission band of the MS according to the preference for each band.