Abstract: A VSB reception system includes a sequence generator for decoding a symbol corresponding to the supplemental data and generating a predefined sequence included in the supplemental data at VSB transmission system. The reception system also includes a modified legacy VSB receiver for processing the data received from the VSB transmission system in a reverse order of the VSB transmission system by using the sequence, and a demultiplexer for demultiplexing the data from the modified legacy VSB receiver into the MPEG data and the supplemental data. The VSB reception system also includes a supplemental data processor for processing the supplemental data segment from the demultiplexer in a reverse order of the transmission system, to obtain the supplemental data, thereby carrying out the slicer prediction, decoding, and symbol decision more accurately by using the predefined sequence, to improve a performance.

Abstract: A VSB reception system includes a sequence generator for decoding a symbol corresponding to the supplemental data and generating a predefined sequence included in the supplemental data at VSB transmission system. The reception system also includes a modified legacy VSB receiver for processing the data received from the VSB transmission system in a reverse order of the VSB transmission system by using the sequence, and a demultiplexer for demultiplexing tie data from tie modified legacy VSB receiver into the MPEG data and the supplemental data. The VSB reception system also includes a supplemental data processor for processing the supplemental data segment from the demultiplexer in a reverse order of the transmission system, to obtain the supplemental data, thereby carrying out the slicer prediction, decoding, and symbol decision more accurately by using the predefined sequence, to improve a performance.

Abstract: A VSB reception system includes a sequence generator for decoding a symbol corresponding to the supplemental data and generating a predefined sequence included in the supplemental data at VSB transmission system. The reception system also includes a modified legacy VSB receiver for processing the data received from the VSB transmission system in a reverse order of the VSB transmission system by using the sequence, and a demultiplexer for demultiplexing the data from the modified legacy VSB receiver into the MPEG data and the supplemental data. The VSB reception system also includes a supplemental data processor for processing the supplemental data segment from the demultiplexer in a reverse order of the transmission system, to obtain the supplemental data, thereby carrying out the slicer prediction, decoding, and symbol decision more accurately by using the predefined sequence, to improve a performance.

Abstract: Disclosed is a method for controlling a memory in a mobile communication system. The method includes receiving certain frame control information by a Data Receiver Block (DRB) from a MAP decoder, forming a burst descriptor by the DRB by using the frame control information, and transferring the burst descriptor to a Low Medium Access Control (LMAC), and allocating a memory by the LMAC based on bursts according to the burst descriptor.

Abstract: A method and apparatus are provided where a neighbor cell interference signal is canceled upon receiving a signal transmitted from a serving base station (BS) in a receiver of an Orthogonal Frequency Division Multiple Access (OFDMA) system. The interference signals are detected from signals received from neighbor BSs and a serving BS. The strength of the detected interference signals is measures, and a determination is made whether the measured strength is higher than a threshold value. A list of neighbor BSs satisfying the determination result is reordered, and interference signals in order of the reordered neighbor BSs are selected and detected. An interference/noise variance for the detected interference signal is calculated and normalized. The normalized interference signal is decoded and regenerated, and the regenerated interference signal is subtracted from the received signal.

Abstract: A gain control apparatus of an interference cancellation receiver that performs interference cancellation in a frequency axis in an Orthogonal Frequency Division Multiple Access (OFDMA) system. A first signal power measurer measures first signal power of a received signal that was received from a base station and then underwent fast Fourier transform (FFT). A first range controller generates a first range control value for matching the first signal power to an operating point of the FFT-processed original signal. An FFT output buffer buffers the FFT-processed received signal. A second signal power measurer measures second signal power of a regenerated interference signal. A second range controller compares the first signal power with the second signal power, and generates a second range control value for controlling a gain of an output signal according to an operating point of a signal obtained by canceling the interference signal from the received signal output from the FFT output buffer.

Abstract: Provided is a hard handover method in a wireless communication system. The hard handover method includes checking a signal-to-noise ratio (SNR) of a signal received from each of at least one neighboring base station (BS) while in communication with a serving BS, and canceling interference if the SNR of the signal received from each of the at least one neighboring BSs satisfies a select condition; sending a handover request to the serving BS, if a difference between a SNR of the interference-canceled signal and a SNR of the interference signal reaches a handover request threshold; and upon receipt of a handover approval from the serving BS, releasing a communication channel to the serving BS, and connecting a call to a BS that provides an interference signal whose SNR has reached the threshold.

Abstract: An apparatus and method are provided for stopping iterative decoding in a channel decoder of a mobile communication system. Constituent decoding of received signals is performed and decoded signals are output. Hard decision processes for the decoded signals are performed and hard-decided signals are output. The hard-decided signals are cyclic redundancy check (CRC) encoded, and a determination is made as to whether the parities are identical and iterative decoding is stopped according to a determination result.

Abstract: An apparatus and method are provided for normalizing input soft metric to a channel decoder in a wireless communication system. A demapper generates soft metric using an in-phase component (Xk) and a quadrature component (Yk) of a received modulated symbol (Rk), a channel fading coefficient (gk) and a constant value (c) defined by a modulation order of the received modulated symbol. A normalizer receives the soft metric, computes a normalized log likelihood ratio (LLR) by multiplying the soft metric by a ratio of the constant value to a noise variance value, transforms the normalized LLR into a desired range and a desired number of bits, and outputs an input LLR of the channel decoder.

Abstract: A decoding apparatus in an Orthogonal Frequency Division Multiple Access (OFDMA) mobile communication system is provided. In the apparatus comprises, a first combiner performs first combining on an input burst a first number of times. A deinterleaver deinterleaves an output of the first combiner and outputs a burst having a repeated structure. A second combiner performs second combining on the burst having the repeated structure a second number of times. A decoder decodes the combined burst. A signal detector stores a second internal memory state value of the decoder for an instance where a first decoded bit is extracted from the decoded data, stores a second internal memory state value of the decoder for an instance where a last decoded bit is extracted from the decoded data, compares the first and second stored internal memory state values of the decoder, and sets a burst quality indicator (BQI) according to the comparison result.

Abstract: An apparatus and method for estimating and reporting a Carrier to Interference Noise Ratio (CINR) in a wireless communication system are provided. The wireless communication system receives the CINR reported from the mobile station and transmits data by adaptively setting a coding and modulation level. In a mobile station, a Radio Frequency (RF) processor provided with at least two antennas processes antenna-by-antenna radio signals and converts the radio signals to baseband signals. Switches output or intercept the antenna-by-antenna signals received from the RF processor. An effective CINR measurer measures diversity parameters including a CINR value from the signals output by the switches and outputs the measured diversity parameters. A controller controls an operation for turning on/off the switches on a basis of the diversity parameters received from the effective CINR measurer and generates a report message using the diversity parameters. A transmitter transmits the report message to a base station.

Abstract: A method and apparatus for decoding a concatenated burst in a WiBro system are provided. A concatenated decoder fragments a received burst into fragment blocks, decodes at least one of the fragment blocks, and determines whether the decoded fragment block satisfies a circular state. A concatenated decoding controller determines burst quality information of the received burst according to a circular state check result on the decoded fragment block, and determines whether to stop decoding on the received burst according to the burst quality information.

Abstract: A method and an apparatus are provided for estimating a carrier-to-interference and noise ratio (CINR) in an orthogonal frequency division multiplexing (OFDM) communication system. The apparatus and method include a receiver for receiving a signal carried by a transmission sub-carrier including a guard band allocated to a region. Further, an estimator is provided for removing a signal component dispersed by the guard band included in a noise component of the received signal, and for estimating a CINR by calculating signal component power and interference and noise component power from the received signal from which the dispersed signal component is removed.

Abstract: A VSB reception system includes a sequence generator for decoding a symbol corresponding to the supplemental data and generating a predefined sequence included in the supplemental data at VSB transmission system. The reception system also includes a modified legacy VSB receiver for processing the data received from the VSB transmission system in a reverse order of the VSB transmission system by using the sequence, and a demultiplexer for demultiplexing the data from the modified legacy VSB receiver into the MPEG data and the supplemental data. The VSB reception system also includes a supplemental data processor for processing the supplemental data segment from the demultiplexer in a reverse order of the transmission system, to obtain the supplemental data, thereby carrying out the slicer prediction, decoding, and symbol decision more accurately by using the predefined sequence, to improve a performance.

Abstract: Disclosed is a digital communication system. A transmission system includes an error correction encoder part carrying out an error correction encoding for additional data inputted through a first path, a multiplexer (MUX) part, a control part, a channel coding part carrying out an RS encoding and a TCM encoding, and a VSB transmission part modulating the channel-coded data by a VSB method and outputting the modulated data.

Abstract: An apparatus and method for estimating a carrier-to-interference-and-noise ratio (CINR) of a received signal in an orthogonal frequency division multiplexing (OFDM) system are provided. A band-pass filter attenuates a signal region of the received signal and passes a signal in a noise region. A first power calculator calculates interference and noise power of the noise-region signal received from the band-pass filter. A second power calculator calculates total received power of the received signal. A ratio calculator calculates a CINR based on the interference and noise power, and the total received power.

Abstract: An apparatus and method for improving antenna diversity in a receiver of a broadband wireless communication system using multiple antennas are provided. The receiver with the diversity apparatus uses a structure of multiple analog front ends, a structure for measuring antenna-by-antenna reception power values/Carrier-to-Interference plus Noise Ratios (CINRs) after Fast Fourier Transform (FFT) using a single analog front end, and a structure based on a single analog front end for measuring antenna-by-antenna reception power values after Analog-to-Digital (A/D) conversion without use of FFT. When a receive antenna is selected, the measured reception power values/CINRs are used. In a system for transmitting pilot signals with preamble data in a regular pattern, the receiver can have improved performance through a suitable frequency modulation process and can be implemented at low cost, as compared with that of the conventional antenna selection diversity.

Abstract: Disclosed is an apparatus and a method for effectively allocating frequency resources in a mobile communication system. The method includes: determining a first offset of a preset frequency band from among all frequency bands, determining a second offset corresponding to a symbol unit in the preset frequency band, and allocating frequency resources to data, the frequency resources corresponding to a sum of the first offset and the second offset.

Abstract: A digital VSB transmission system that is able to send supplemental data along with MPEG image/sound data is enclosed. The system initially encodes the supplemental data symbol to generate a parity bit, and it multiplexes the parity bit with a predefined sequence and transmits the multiplexed data to a receiver. The system is compatible with the existing ATSC 8T-VSB receivers that are already on the market. It can have advantages over the other types of VSB transmission systems that transmit only the predefined sequence. In addition, the system according the to the present invention results an improved robustness against ghost and noise signals in a channel compared to systems using only the ½ rate convolutional encoding.

Abstract: A VSB communication system or transmitter for processing supplemental data packets with MPEG-II data packets includes a VSB supplemental data processor and a VSB transmission system. The VSB supplemental data processor includes a Reed-Solomon coder for coding the supplemental data to be transmitted, a null sequence inserter for inserting a null sequence to an interleaved supplemental data for generating a predefined sequence, a header inserter for inserting an MPEG header to the supplemental data having the null sequence inserted therein, a multiplexer for multiplexing an MPEG data coded with the supplemental data having the MPEG header added thereto in a preset multiplexing ratio and units. The output of the multiplexer is provided to an 8T-VSB transmission system for modulating a data field from the multiplexer and transmitting the modulated data field to a VSB reception system.