Patent application number | Description | Published |
20090232068 | METHOD FOR DYNAMICALLY ASSIGNING CHANNELS OF WIRELESS COMMUNICATION SYSTEM - The present invention provides a method for dynamic channel assignment for a wireless communication system. First, a respective channel allocation probability vector at each mobile terminal is randomly generated, and is then sent to the base stations covering the mobile terminal. Subsequently, the channel allocation probability vectors are integrated into channel allocation information for the mobile terminals covered by the base station. Afterwards, based on the channel allocation information, a corresponding channel allocation notice is sent to the mobile terminals covered by the base station, respectively. Finally, according to the channel allocation notice, the channels of the base station are assigned for the mobile terminals covered by the base station. | 09-17-2009 |
20090254797 | Iterative Signal Receiving Method and Related Iterative Receiver - Considering both performance and cost of an iterative receiver, the present invention provides an iterative signal receiving method for a wireless communications system. The iterative signal receiving method includes utilizing a channel estimating (CE) process to perform channel estimation for a received signal according to first log-likelihood ratio (LLR) data to generate second LLR data, and then generating the first LLR data according to an error correction code (ECC) decoding process and the second LLR data. When the ECC decoding process is a convolutional decoding process, the CE process is a zero-forcing process, a minimum mean square error (MMSE) process or an interpolation-based process. When the ECC decoding process is a low density parity check code (LDPC) decoding process, the CE process is a maximum likelihood (ML) process or a maximum a posteriori (MAP) process. | 10-08-2009 |
20100190457 | APPROXIMATION METHOD FOR SIGNAL-TO-NOISE RATIO SOFT INFORMATION FOR A COMMUNICATIONS SYSTEM - An approximation method for SNR soft information for a transmitter of a communications system includes obtaining a conditional probability density function (PDF) corresponding to a response message of a transmitted packet, obtaining a PDF of a probability distribution model, and a mean and a variance of the PDF, by approximating the conditional PDF corresponding to the response message with the probability distribution model, and calculating a second mean and a second variance of a second PDF approximated to a conditional PDF of SNR corresponding to the transmitted packet according to the mean and the variance of the PDF, and a first mean and a first variance of a first PDF approximated to a conditional PDF of SNR corresponding to another transmitted packet immediately preceding the transmitted packet. | 07-29-2010 |
20100260249 | METHOD OF EXAMINING ELIGIBILITY OF A MODULATION AND CODING SCHEME FOR A COMMUNICATIONS SYSTEM - A method of examining the eligibility of a modulation and coding scheme includes determining a range of pseudo signal-to-noise ratio (pseudo-SNR) corresponding to a range of packet correct rate (PCR) acceptable for a transmitter, obtaining a first score of a positive acknowledgement (ACK) and a second score of a negative acknowledgement (NACK) according to the range of pseudo-SNR and the range of PCR, applying weighting to a score of a response message, which is one of an ACK message and a NACK message, and a pseudo-SNR corresponding to an immediately preceding response message when receiving the response message, for generating a pseudo-SNR corresponding to the response message, and examining the eligibility of a modulation and coding scheme in use according to the pseudo-SNR corresponding to the response message. | 10-14-2010 |
20100272167 | Method and Apparatus for Simplifying a Probabilistic Rate Adaptation Procedure in a Wireless Communication System - The present invention provides a method for simplifying a probabilistic rate adaptation procedure in a wireless communication system, which comprises calculating a conditional probability density function of SNR of a transmitted signal by the probabilistic rate adaptation procedure, to generate an SNR estimation result, taking logarithm on the SNR estimation result to generate a logarithm result, and partitioning SNR values into a plurality of regions according to the logarithm result, to generate a discrete function from the SNR estimation result. | 10-28-2010 |
20100272198 | Method of Detecting Transmission Channel and Related Wireless Communication System - A method and related system of transmission channel detection condition in a wireless communication system are disclosed. The method includes receiving a symbol, performing a channel estimation operation to generate a channel estimation result according to the symbol, performing a cross correlation operation on the channel estimation result and an initial channel estimation result to generate an operation result, and determining whether the condition of the transmission channel have changed or not. | 10-28-2010 |
20100289699 | Method and Apparatus for Determining a Position of a Mobile Station in a Wireless Communication System - A method for determining a position of a mobile station in a wireless communication system includes generating a state equation set according to a current state of the mobile station, for predicting a position and a velocity of the mobile station after a predetermined period, and corresponding the state equation set to a graphic interface for calculating the position and the velocity after the predetermined period. | 11-18-2010 |
20100295734 | METHOD AND APPARATUS OF USING SOFT INFORMATION FOR ENHANCING ACCURACY OF POSITION ESTIMATION FOR A WIRELESS COMMUNICATION SYSTEM - A method of enhancing accuracy of position estimation for a wireless communication system includes receiving a plurality of input measurements required for estimating a position of a target, and generating a plurality of Gaussian probability density functions corresponding to the plurality of input measurements, the plurality of Gaussian probability density functions being used for estimating the position of the target. | 11-25-2010 |
20100309059 | Method and Apparatus of Positioning for a Wireless Communication System - A method of estimating a position of a target device for a wireless communication system includes receiving a plurality of received signal strength measurements with respect to a plurality of base stations measured by the target device when the target device enters an area, and applying a graphical model to estimate the position of the target device according to the plurality of received signal strength measurements. | 12-09-2010 |
20100329168 | Frequency Band Assignment Method for a Wireless Communication System and Device Using the Same - A frequency band assignment method for a wireless communication system is disclosed. The wireless communication system includes a plurality of base stations. The plurality of base stations has overlapped radio ranges and forms a plurality of independent overlapping areas. The method includes steps of modeling the plurality of base stations as a plurality of variable nodes in a factor graph, modeling the plurality of independent overlapping areas as a plurality of constraint nodes in the factor graph, and using the factor graph to perform frequency assignment for the plurality of base stations. Each variable node is defined as a frequency band to be assigned to the modeled base station. Each constraint node is defined as that the frequency bands assigned to the base stations forming the modeled overlapping area cannot be equivalent. | 12-30-2010 |
20110007722 | Base Station Selection Method for a Wireless Communication System and Device Using the Same - A base station selection method is disclosed. The wireless communication system includes a plurality of base stations with overlapped radio ranges and a plurality of wireless devices. The method includes steps of modeling the plurality of base stations as a plurality of variable nodes in a factor graph, modeling the plurality of wireless devices as a plurality of constraint nodes in the factor graph, and selecting a base station for transmission from the plurality of base stations based on the factor graph. Each variable node is defined as a frequency band state of a corresponding base station. Each constraint node is linked to the variable nodes corresponding to the base stations that include the corresponding wireless device in their radio ranges, and is defined as that the frequency band states of the base stations including the corresponding wireless device in their radio ranges can not be all turned off. | 01-13-2011 |
20110013532 | Method for Wireless Communication System and Device Using the Same - A method, for determining a first amount of a plurality of high-throughput long training fields within a packet in a wireless communication system, includes determining a second amount of a plurality of space time streams needed by the wireless communication system transmitting the packet, and setting the first amount to be greater than or equal to 8 when the second amount is greater than 4. | 01-20-2011 |
20110013547 | METHOD OF GENERATING PREAMBLE SEQUENCE FOR WIRELESS COMMUNICATION SYSTEM AND DEVICE THEREOF - A method of generating preamble sequence for a wireless communication system includes generating a frequency-domain preamble sequence related to a packet, transforming the frequency-domain preamble sequence into a first time-domain preamble sequence, performing a cyclic shift delaying process on the first time-domain preamble sequence for generating a second time-domain preamble sequence, and normalizing power of the first time-domain preamble sequence and the second time-domain preamble sequence for generating the first field of a preamble of the packet. | 01-20-2011 |
20110013575 | METHOD OF GENERATING PREAMBLE SEQUENCE FOR WIRELESS LOCAL AREA NETWORK SYSTEM AND DEVICE THEREOF - A method of generating a preamble sequence includes generating a first frequency-domain preamble sequence according to information of the packet, the first frequency-domain preamble sequence comprising a plurality of subsequences corresponding to a plurality of sub-channels, adjusting a phase of each subsequence of the first frequency-domain preamble sequence, for generating a second frequency-domain preamble sequence, transforming the second frequency-domain preamble sequence into a first time-domain preamble sequence, performing a cyclic shift delaying process on the first time-domain preamble sequence, for generating a plurality of delayed time-domain preamble sequences, and normalizing power of the plurality of delayed time-domain preamble sequences, for generating a second time-domain preamble sequence that is a preamble sequence of the packet. | 01-20-2011 |
20110013721 | METHOD OF GENERATING PREAMBLE SEQUENCE - A method of generating preamble sequence is disclosed. A channel used by a wireless device may be divided into four sub-channels, and the method includes forming a preamble sequence of a first sub-channel, making three replicas of the preamble sequence of the first sub-channel, each replica with a phase rotation of a first angle, a second angle, and a third angle respectively, for forming each preamble sequence of a second sub-channel, a third sub-channel, and a fourth sub-channel, and arranging the preamble sequences of the first, the second, the third, and the fourth sub-channels to form a preamble sequence of the channel. | 01-20-2011 |
20110013722 | Method for Generating Training Sequences and Transmitter Using the Same - A method for generating training sequences in a transmitter having a plurality of transmitting antennas, includes dividing each of a plurality of symbols into a plurality of sub-symbols with a quantity equal to a quantity of the plurality of transmitting antennas, sequentially transforming a plurality of sub-symbols corresponding to same positions in each of the plurality of symbols, to generate a plurality of training data, and generating a plurality of training sequences of independent frequencies according to the plurality of training data, for forming parts of packets emitted by the plurality of transmitting antennas. | 01-20-2011 |
20110026392 | Method and Apparatus of Subcarrier Grouping for a Wireless Communication System - A method sub-carrier grouping for a wireless communication system including a plurality of sub-carriers is disclosed. The method includes determining a coherent bandwidth of the plurality of sub-carriers, and dividing the plurality of sub-carriers into a plurality of sub-carrier groups according to the coherent bandwidth, wherein the size of each sub-carrier group is smaller than or equal to the coherent bandwidth. | 02-03-2011 |
20110176626 | Pilot Signal Determination Method and Wireless Communication System Using the Same - The present invention disclose a pilot signal determination method for a wireless communication system. The wireless communication system utilizes a plurality of sub-carriers. The pilot signal determination method includes steps of generating at least one vector corresponding to at least one sub-channel; and determining a plurality of pilot signals according to the at least one vector. | 07-21-2011 |
20110176627 | Multi-user Transmission Method, Multiple Input Multiple Output Transmission System Using the Same, Scheduling Method and Access Point Using the Same - The present invention discloses a multi-user (MU) transmission method for a multiple input multiple output (MIMO) transmission system comprising a first station and a plurality of second stations. The MU transmission method includes the step of the first station performing simultaneous transmission to a first group of stations of the plurality of second stations in a first transmission interval. | 07-21-2011 |
20110222458 | Multi-user Downlink and Uplink Transmission Method and Communication System Using the Same - The present invention discloses a multi-user (MU) downlink and downlink transmission method for a communication system. The communication system includes an access point (AP) and a plurality of stations. The MU transmission method includes steps of the AP deciding a first group of stations in a first scheduling period based on a channel condition, and the AP and the first group of stations performing simultaneously transmission during a MU media access control period. | 09-15-2011 |
20110222519 | Phase Rotating Method and Wireless Local Area Network Device - The present invention discloses a phase rotating method for a wireless local area network (WLAN) device, which utilizes a channel including a plurality of sub-channels. The phase rotating method includes steps of generating a plurality of data sequences corresponding to the plurality of sub-channels, and making the plurality of data sequences with phase rotations according to a plurality of angles corresponding to the plurality of sub-channels. The channel is a non-contiguous channel. | 09-15-2011 |
20110280232 | Method of Arranging Packets in a Wireless communication System And Related Device - A method of arranging a packet in a wireless communication system includes a preamble sequence and a data sequence. The preamble sequence includes a legacy training field (L-TF), a legacy signal field (L-SIG), a very high throughput signal field (VHT-SIG), a very high throughput short training field (VHT-STF) and at least one very high throughput long training field (VHT-LTF). The method includes generating a first VHT-SIG field and a second VHT-SIG field according to the VHT-SIG field; and arranging the L-TF field, the L-SIG field, the first VHT-SIG field, the VHT-STF field, one of the at least one VHT-LTF fields, the second VHT-SIG field and the rest of the at least one VHT-LTF fields in a predetermined sequence. | 11-17-2011 |
20110281534 | Phase Rotation Method for Reducing PAPR - A method of reducing a signal peak to average power ratio (PAPR) for a transmission channel in a wireless communication system is disclosed. The transmission channel is divided into a plurality of channel segments, and the method includes calculating PAPRs corresponding to the plurality of channel segments by a plurality of phase rotation vectors; selecting a plurality of specified phase rotation vectors from the plurality of phase rotation vectors according to the calculated PAPRs; and using one of the plurality of specified phase rotation vectors to rotate a phase of a signal to be transmitted. | 11-17-2011 |
20110317541 | Block Interleaving Method and Block Interleaver Using the Same - A block interleaving method for interleaving data of a transmitter in a wireless communication system is disclosed. The wireless communication system supports a multi-input multi-output (MIMO) technique for transmitting data via a plurality of spatial streams. The block interleaving method includes when the transmitter transmits a plurality of data through the MIMO technique, determining an order of the plurality of data according to the following equation, | 12-29-2011 |
20110317676 | Block Interleaving Method and Block Interleaver Using the Same - A block interleaving method for interleaving data of a transmitter in a wireless communication system is disclosed. The wireless communication system supports a multi-input multi-output (MIMO) technique for transmitting data via a plurality of spatial streams. The block interleaving method includes when the transmitter transmits a plurality of data through the MIMO technique, determining an order of the plurality of data according to the following equation, | 12-29-2011 |