摘要:
Provided is a method of configuring a feedback zone in an uplink zone of a frame. This method is for transmitting feedback data in a wireless communication system. The method sets the feedback zone between a relay station (RS) and a mobile station (MS) in addition to a feedback zone between the MS and a base station (BS), thereby preventing a transmission delay of the feedback data incurred by the RS.
摘要:
A signal transmitting apparatus includes: a plurality of data transmission lines that transmit output data to a memory; a plurality of delay units that are correspondingly connected to the plurality of data transmission lines, that delay test data according to a delay signal for a predetermined time, and that output the delayed test data to each of the data transmission lines; and a transmitting/receiving controller that compares the stored data in the memory with the test data to adjust the delay signal, and that outputs the adjusted delay signal to each of the plurality of delay units. With this configuration, when data is transmitted to a memory through a data bus, a delay value can be adjusted among a plurality of signal lines constituting a data bus, and thus signal transmission can be performed uniformly.
摘要:
The present invention relates to an apparatus and method for variable fast Fourier transform. According to an embodiment of the present invention, two n-point fast Fourier transform (FFT) processors are used to generate two n-point FFT output data or one 2n-point FFT output data. The one 2n-point input data is alternately input to the two n-point FFT processors. Each of the two n-point FFT processors selects a twiddle factor for the n-point input data or the 2n-point input data and performs fast Fourier transform. A butterfly operation is performed on signals obtained by performing fast Fourier transform on the 2n-point input data signal, and the processed signals are aligned in an output order. According to this structure, it is possible to realize a fast Fourier transform hardware engine that selectively performs multi-frequency allocation in a base station system that supports the multi-frequency allocation.
摘要:
An automatic gain control apparatus and method of a mobile station in an OFDM system are provided. The method includes identifying a preamble section and a data symbol section in a received frame signal; when a current symbol is the preamble section, measuring a power value of a preamble signal, comparing the measured power value of the preamble signal and a threshold value, and amplifying the received frame signal based on a predetermined gain; when a data symbol section includes a pilot carrier, measuring an average power value of the pilot carrier in the data symbol, comparing the measured average power value and the threshold value, and amplifying the received frame signal based on a predetermined gain; and when the data symbol section includes no pilot carrier, maintaining an existing gain, or performing an automatic gain control operation according to a gain estimated by using the pilot carrier during the data symbol section.
摘要:
The present invention relates a resource allocation method and a resource allocation device. According to an exemplary embodiment of the present invention, a resource allocation method of a wireless communication system includes: allocating a resource to a first base station; determining whether or not a second cell that is smaller than a first cell is provided in a first cell region managed by the first base station; reducing the resource allocated to the first base station when the second cell is provided; and allocating resources remaining after reducing the resource to a second base station that manages the second cell.
摘要:
The present invention relates a resource allocation method and a resource allocation device. According to an exemplary embodiment of the present invention, a resource allocation method of a wireless communication system includes: allocating a resource to a first base station; determining whether or not a second cell that is smaller than a first cell is provided in a first cell region managed by the first base station; reducing the resource allocated to the first base station when the second cell is provided; and allocating resources remaining after reducing the resource to a second base station that manages the second cell.
摘要:
A terminal main body of a communication terminal is supplied power from a battery pack through a DC signal path. The terminal main body communicates with at least one additional function module providing an additional function through a communication path connected to the DC signal path so as to provide the additional function to a user. Herein, the communication path is an AC signal path. That is, a signal transmitted/received between the terminal main body and the additional function module is an AC signal, and thus, the communication path can be compatible with the DC signal path providing the power. In addition, a plurality of additional function modules can be serially connected in the form of a serial communication bus, and therefore, a user can select a plurality of additional functions.
摘要:
In a communication system, subchannel state information for a plurality of user equipments (UEs) are collected, and a plurality of subchannel state prediction parameter values for the respective UEs are calculated using the subchannel state information. In addition, the communication system allocates at least one subchannel among the plurality of subchannels to a first UE having the highest priority. Subsequently, the communication system determines whether to allocate additional power to the at least one subchannel based on the plurality of subchannel state prediction parameter values, and allocates additional power to a subchannel that needs the additional power among the at least one subchannel.
摘要:
A terminal main body of a communication terminal is supplied power from a battery pack through a DC signal path. The terminal main body communicates with at least one additional function module providing an additional function through a communication path connected to the DC signal path so as to provide the additional function to a user. Herein, the communication path is an AC signal path. That is, a signal transmitted/received between the terminal main body and the additional function module is an AC signal, and thus, the communication path can be compatible with the DC signal path providing the power. In addition, a plurality of additional function modules can be serially connected in the form of a serial communication bus, and therefore, a user can select a plurality of additional functions.
摘要:
Provided is a method and apparatus for determining timing for initial ranging of user equipment by using ranging of adjacent pieces of user equipment in a multi-hop mobile relay (MMR) system, and more particularly, a method and apparatus for determining timing for initial ranging of user equipment in which a power value and a timing value for periodic ranging of adjacent pieces of user equipment are measured so as to minimize an uplink timing error of a base station. In the MMR system, user equipment transmits an initial ranging code to the base station with irregular timing while not knowing an exact start point of an uplink of the base station. In particular, if the user equipment attempts the initial ranging at the same time as when adjacent pieces of user equipment attempt the periodic ranging and the handover ranging, an error occurs between transmission timing of the initial ranging and uplink timing, thereby acting as an inter-symbol interference (ISI) and inter-channel interference (ICI) of different ranging. As a result, the initial ranging acts as an interference signal in a ranging process of adjacent pieces of user equipment. However, the apparatus and method can minimize a timing error of the initial ranging code of user equipment by avoiding the initial ranging acting as the interference signal.