Patent application number | Description | Published |
20100202301 | METHOD FOR SWITCHING BETWEEN A LONG GUARD INTERVAL AND A SHORT GUARD INTERVAL AND MODULE USING THE SAME - The module for switching between a long guard interval and a short guard interval comprises a signal processing unit, a measurement unit, a comparison unit and a switching unit. The module receives a first data symbol, and the data symbol has one of a long guard interval and a short guard interval. The signal processing unit is configured to generate a second data symbol in accordance with the first data symbol. The measurement unit is configured to measure a portion of the first and second data symbols in order to generate a first measurement value and a second measurement value. The comparison unit is configured to generate an output signal by comparing the first and second measurement values with a threshold value. The switching unit is configured to selectively switch guard intervals of subsequent data symbols in accordance with the output signal. | 08-12-2010 |
20100202370 | METHOD FOR SELECTING MODULATION AND CODING SCHEME FOR MULTI-ANTENNA SYSTEM - A method for selecting modulation and coding scheme (MCS) for multi-antenna systems comprises the steps of: a multi-antenna system transmits signals according to MCSs of single spatial stream and determines an MCS accordingly. Subsequently, the multi-antenna system increases the number of the spatial streams applied, transmits signals according to the corresponding MCSs and determines an MCS accordingly until an optimum MCS is found. | 08-12-2010 |
20100254479 | METHOD FOR DETERMINING A MODULATION AND CODING SCHEME - A method for determining a modulation and coding scheme comprises the steps of: transmitting signals with different modulation and coding schemes and adjusting weighting of each modulation and coding scheme based on the quality of transmitted signals on a receiving end; adjusting the weighting of each modulation and coding scheme based on suggested modulation and coding schemes; determining a modulation and coding scheme to use according to the weighting of each modulation and coding scheme. | 10-07-2010 |
20100265929 | METHOD FOR DETERMINING A MODULATION AND CODING SCHEME - A method for determining a modulation and coding scheme for signals with packets of different lengths comprises the steps of: grouping signals according to their packet lengths, wherein each group has a weighting for each modulation and coding scheme; transmitting signals with different modulation and coding schemes; adjusting weights of each modulation and coding scheme of each group according to the quality of receiving the transmitted signals; determining a modulation and coding scheme according to the weightings of each modulation and coding scheme in the group corresponding to the packet length of the signal to be transmitted. | 10-21-2010 |
20110119567 | SIGNAL PROCESSING METHOD AND COMMUNICATION SYSTEM USING THE SAME - A signal processing circuit in a transmitter of a communication system comprises an appending circuit, a scrambler, an FEC encoder and a stream parser. The appending circuit is configured to divide a packet data string into a plurality of divided data strings, append a predetermined string to the tail of each divided data string, and output the appended data strings sequentially. The scrambler is configured to perform a scramble operation for the appended data strings. The FEC encoder is configured to sequentially encode the output data strings of the scrambler into convolutional code-words complying with the requirements of a MIMO communication system. The stream parser is configured to forward the convolutional code-words to at least a stream signal processing circuit. | 05-19-2011 |
20110170522 | WIRELESS TRANSMISSION METHOD FOR SPATIAL DIVISION MULTIPLE ACCESS SYSTEM - A wireless transmission method comprises the steps of: determining transmission time slots and start antenna indexes of a plurality of stations in a spatial division multiple access system according to the number of antennas of the plurality of stations; broadcasting a control frame signal to the plurality of stations and waiting for requests to transmit signals from the plurality of stations, wherein the control frame signal includes the transmission time slots and start antenna indexes of the plurality of stations; receiving the requests to transmit signals from the plurality of stations; and broadcasting a clear to transmit signal to the plurality of stations based on the received request to transmit signals. The requests to transmit signals of the plurality of stations, which are transmitted based on the transmission time slots and start antenna indexes of the plurality of stations, conform to a multi-input multi-output transmission standard of the access point. | 07-14-2011 |
20110176631 | COMMUNICATION METHOD FOR MIMO COMMUNICATION SYSTEM - A communication method for a MIMO communication system comprises the steps of: transmitting a plurality of first streams modulated in a non space division multiplexing manner from a transmitter to a plurality of receiving stations; and transmitting a plurality of second streams following the plurality of first streams modulated in a space division multiplexing manner from the transmitter to the plurality of receiving stations. Each of the first streams comprises a legacy short training field, a legacy long training field, a legacy signal field and at least a very high throughput signal field, and each of the first streams has the same length. Each of the second streams comprises a very high throughput short training field, a plurality of very high throughput long training fields and a data field, and each of the second streams has the same length. | 07-21-2011 |
20110222612 | METHOD FOR DETERMINING SIGNAL PHASE ROTATION OF SUB-CHANNELS WITHIN A TRANSMISSION BANDWIDTH - A method for determining signal phase rotation of sub-channels within a contiguous transmission bandwidth comprises the steps of: determining a fundamental set of phase rotations; performing a cyclic shift operation for the fundamental set of phase rotations to generate a cyclic-shifted set of phase rotations; multiplying the cyclic-shifted set of phase rotations by a complex constant to generate a final set of phase rotations; and determining the phase rotation of each sub-channel within the contiguous transmission bandwidth according to the final set of phase rotations. | 09-15-2011 |
20110280326 | METHOD FOR CLUSTERING MULTIPLE STATIONS - A method for clustering multiple stations for a MIMO communication system comprises the steps of: assigning a plurality of stations of a MIMO communication system to a plurality of clusters, wherein each station is assigned to at least one cluster, and at least one cluster is assigned with more than one station; and assigning the plurality of clusters to a plurality of sets, wherein each cluster is assigned to a set. | 11-17-2011 |
20110280335 | METHOD FOR MULTI-CHANNEL TRANSMISSION WITH MULTIPLE FREQUENCY SEGMENTS - A method for multi-channel transmission with multiple frequency segments comprises the steps of: determining a plurality of non-contiguous frequency segments from an available frequency band of a communication system, wherein each frequency segment comprises a plurality of contiguous channels; determining available channels from the channels in the plurality of non-contiguous frequency segments, wherein the number of available channels is less than or equal to the number of total channels in the plurality of non-contiguous frequency segments; determining a primary channel from the available channels; performing channel bonding technique on the available channels; and performing multi-channel transmission by performing dynamic channel selection technique on the available channels. | 11-17-2011 |
Patent application number | Description | Published |
20100135320 | RATE ADAPTATION METHOD FOR COMMUNICATION SYSTEMS - A rate adaptation method comprises the steps of: updating the probability density function of the SNR of a transmitted signal according to the receiving status of the transmitted signal and the probability density function before update; and updating the transmission rate of the transmitted signal according the updated probability density function. | 06-03-2010 |
20100142459 | METHOD FOR SELECTING MODULATION AND CODING SCHEME - A method for selecting a modulation and coding scheme (MCS) applied to a multiple-antenna system. The method calculates the throughout of a plurality of MCSs based on the signal to noise ratio of the multiple-antenna system and selects a MCS from the plurality of MCSs accordingly. | 06-10-2010 |
20100178891 | METHOD AND CIRCUIT FOR CALIBRATING ANALOG CIRCUIT COMPONENTS - A method for calibrating an analog circuit component comprises the steps of: generating a first signal with a baseband frequency; generating a second signal by processing the first signal via the analog component to be calibrated; generating a third signal by processing the second signal via a power amplifier, wherein the power amplifier operates in a nonlinear region; generating a fourth signal by processing the third signal via a low-pass filter; and defining the adjustment for the In-phase-Quadrature-phase imbalance (IQ imbalance) of the analog component and then re-executing the step of generating the first signal, if the fourth signal shows an IQ imbalance mismatch. | 07-15-2010 |
20100185913 | METHOD FOR DECODING LDPC CODE AND THE CIRCUIT THEREOF - A method for decoding LDPC code comprises the steps of: marking non-zero sub-matrices of a parity-check matrix of an LDPC code as 1 and zero sub-matrices of the parity-check matrix as 0 to form a simplified matrix; rearranging the sequence of rows of the simplified matrix according to the dependency between these rows; and updating the LDPC code in accordance with the sequence of the rows. | 07-22-2010 |
20110274002 | METHOD AND SYSTEM OF OPERATING A MULTI-USER SYSTEM - A method and system is disclosed for grouping the multiple stations connected to an access point (AP). The system and method comprise sending a sounding packet to a plurality of stations, wherein the stations may be all or part of the stations that are located within the range of the AP. The stations that receive the sounding packets respond to the AP, and the AP determines the channel state information (CSI) from the responses. According to the CSI, the AP divides the multiple stations into several groups. According to an embodiment of the present invention, a confirmation step is performed to each group of stations, respectively. The AP sends a second sounding packet to each group of stations, and verifies the CSI between each station group by group. Therefore, the method and system provides for monitoring the validation of each group by periodically sending sounding packets to each group. | 11-10-2011 |
20110274003 | METHOD AND SYSTEM OF OPERATING A MULTI-USER SYSTEM - A method and system is disclosed for grouping the multiple stations connected to an access point (AP). The system and method comprise sending a sounding packet to a plurality of stations, wherein the stations may be all or part of the stations that are located within the range of the AP. The stations that receive the sounding packets respond to the AP, and the AP determines the channel state information (CSI) from the responses. According to the CSI, the AP divides the multiple stations into several groups. According to an embodiment of the present invention, a confirmation step is performed to each group of stations, respectively. The AP sends a second sounding packet to each group of stations, and verifies the CSI between each station group by group. Therefore, the method and system provides for monitoring the validation of each group by periodically sending sounding packets to each group. | 11-10-2011 |
20120009961 | METHOD AND APPARATUS FOR BEAMFORMING IN A WIRELESS COMMUNICATION SYSTEM - Varying embodiments of the present invention describes a method and apparatus for beamforming in a wireless communication system. A first embodiment is a method for beamforming in a wireless communication system, the system comprising a transmitter and a receiver. The method comprises initiating beamforming on a communication channel between the transmitter and the receiver wherein the communication channel comprises at least two transmit chains, controlling the beamforming by mapping the data stream(s) to the at least two transmit chains and controlling the scaling of the at least two transmit chains within a transmit power constraint. | 01-12-2012 |
20140348082 | METHOD AND SYSTEM OF OPERATING A MULTI-USER SYSTEM - A method and system is disclosed for grouping the multiple stations connected to an access point (AP). The system and method comprise sending a sounding packet to a plurality of stations, wherein the stations may be all or part of the stations that are located within the range of the AP. The stations that receive the sounding packets respond to the AP, and the AP determines the channel state information (CSI) from the responses. According to the CSI, the AP divides the multiple stations into several groups. According to an embodiment of the present invention, a confirmation step is performed to each group of stations, respectively. The AP sends a second sounding packet to each group of stations, and verifies the CSI between each station group by group. Therefore, the method and system provides for monitoring the validation of each group by periodically sending sounding packets to each group. | 11-27-2014 |