Abstract:
PURPOSE: A frequency diversity transmission/reception apparatus and a method thereof capable of transmitting data without reduction by a transceiving antenna are provided to obtain diversity gain of frequency without reducing transfer rate of the data. CONSTITUTION: A data combination unit(200) receives data signals from encoded bitstream. The data combination unit assembles the received data signal. A sub carrier allocation unit(210) allocates the symbol to the subcarrier. The symbols are mapped in subcarrier which is adjacent to the symbols. The diversity properties of the frequency are obtained without transmitting symbols.
Abstract:
A beacon retransmission device using EBS in mobile network, a beacon retransmission method and an initial connection method are provided to share frequency allocation between networks by using EBP and use the frequency allocation efficiently. A beacon frame receiver(210) receives a beacon frame from a management server managing mobile network. The beacon frame comprises the beacon information for the communications in the mobile network and EBS(Echo Beacon Slot) information. The EBS information indicates EBS(Echo Beacon Slot) allocated for the beacon retransmission among the time slots of the super frame. A beacon retransmitter(220) retransmits the Beacon information for EBS.
Abstract:
The data sink and method data transfer equipment and method, and data sink and method are provided to reduce the peak to average power ratio(Peak-to-Average Power Ratio, PAPR) and to reduces the complexity of data transfer equipment. The digital modulator(301) receives data consisting of a plurality of bits. The digital modulator outputs a plurality of digital modulation symbols by performing the digital modulation. The pilot insertion(303) receives a plurality of digital modulation symbols from the digital modulator. The pilot insertion outputs a plurality of pilot inserted symbols by inserting a plurality of pilots into a plurality of digital modulation symbols. The sub carrier assignment part(305) receives a plurality of pilot inserted symbols from the pilot insertion. The sub carrier assignment part outputs the sub carrier assignment signal by assigning a plurality of pilot inserted symbols to a plurality of subcarriers.
Abstract translation:提供了数据宿和方法数据传输设备和方法以及数据宿和方法,以降低峰均功率比(Peak-to-Average Power Ratio,PAPR),降低数据传输设备的复杂度。 数字调制器(301)接收由多个比特组成的数据。 数字调制器通过执行数字调制输出多个数字调制符号。 导频插入(303)从数字调制器接收多个数字调制符号。 导频插入通过将多个导频插入到多个数字调制符号中来输出多个导频插入符号。 副载波分配部(305)从导频插入接收多个导频插入符号。 子载波分配部分通过将多个导频插入符号分配给多个子载波来输出子载波分配信号。
Abstract:
A method and an apparatus of generating a signal for an initial ranging in an OFDMA(Orthogonal Frequency Division Multiple Access) system are provided to simply generate plural symbols with continuous phases irrespective of the number of symbol for the initial ranging by using a single mathematical equation. A ranging code generator(308) generates a ranging code. A ranging channel generator(310) modulates the ranging code and generates L symbols by phase-rotating the modulated ranging codes according to a symbol index and a sub-carrier index. The ranging channel generator maps the symbols on a constellation to the sub-carrier according to an index of the sub-carrier. A converter converts the mapped symbols into a time domain and generates sample data of the ranging symbol. A guard interval insertion unit(304) copies a tail portion of the sample data corresponding to the size of the guard interval, and inserts the copied portion in front of the sample data as the guard interval, such that the initial ranging signal is formed.
Abstract:
A method of generating a pilot pattern for adaptive channel estimation, a method of transmitting and receiving using the pilot pattern and an apparatus thereof are provided to minimize channel estimation performance degradation due to interpolation under severe channel environment as maintaining low pilot density. According to a method of generating a pilot pattern for adaptive channel estimation, the size of a slot where the pilot pattern is repeated in a time domain and a frequency domain is determined(S301). A random subcarrier in a first OFDMA(Orthogonal Frequency Division Multiple Access) symbol in the time domain slot is determined as a pilot insertion position(S303). Frequency-time distance from pilots of all prior OFDMA symbols in the time domain slot to each remaining sub carrier is calculated, as to each remaining sub carrier of the present OFDMA symbol after the first OFDMA symbol in the time domain slot(S304). Minimum distance in each frequency-time distance assembly of the remaining subcarriers is compared. A subcarrier where the frequency-time minimum distance has a maximum value is determined as pilot insertion position(S312).
Abstract:
An apparatus and a method for generating jacket LDPC(Low Density Parity Check) codes of a Richardson type are provided to constitute an encoder with simple hardware by reducing the complexity of calculating the LDPC codes. An apparatus for generating jacket LDPC codes of a Richardson type includes a jacket pattern generating unit(400), an encoding-rate/encoding-length control unit(410), a zero padding/canceling unit(430), a CPM(Circulant Permutation Matrix) inserting unit(420), and an H matrix generating unit(440). The jacket pattern generating unit(400) generates a jacket matrix based on a jacket pattern in which an inverse matrix of a square matrix is represented as the inverse of each element. The encoding-rate/encoding-length control unit(410) outputs a prime number, which determines the size of CPM based on the size of the jacket matrix generated in the jacket pattern generating unit(400), to satisfy a requested encoding rate. The zero padding/canceling unit(430) inserts zero into the jacket matrix generated in the jacket pattern matrix, and generates a non-square matrix. The CPM inserting unit(420) generates a first CPM of a unit matrix which only has diagonal factors based on the prime number outputted in the encoding-rate/encoding-length control unit(410), and generates all second CPMs by shifting the first CPM corresponding to each factor of the jacket matrix. The H matrix generating unit(440) generates an H matrix of a Richardson type based on the non-square jacket matrix and the second CPM.