Abstract:
PROBLEM TO BE SOLVED: To provide an orthogonal frequency division multiplexing (OFDM) system operating in a frequency band of 1 GHz or lower.SOLUTION: A physical layer logic can implement a repetition logic which repeats part of a data stream to make it easy for a reception device to detect and decode the data stream. The repetition logic may include a preamble repeater which repeats a training field and/or signal field. The repetition logic may include a payload repeater which repeats a payload once or more. In order to detect communication from a transmission device, a reception device is included that includes a correlator which correlates repeated preamble symbols with each other. The reception device may further include a correction logic which corrects the data stream from the communication signal on the basis of multiple repetitions of the payload of the data stream.
Abstract:
PROBLEM TO BE SOLVED: To provide an orthogonal frequency division multiplexing (OFDM) system operating in 1GHz and lower frequency bands.SOLUTION: Physical layer logic may implement a new preamble structure with a new signal field. The preamble structure and/or a preamble may be stored in a machine-accessible medium on the basis of the new preamble structure. A communication with the new preamble structure may be generated and transmitted. Communications with the new preamble structure may be received and detected.
Abstract:
PROBLEM TO BE SOLVED: To provide a method for adding coded bit padding for an orthogonal frequency division multiplexing (OFDM) data transmission device. SOLUTION: The method includes the steps of: receiving a data payload for OFDM transmission; encoding the data payload; adding bit padding to the encoded data payload; and outputting a minimum number of OFDM symbols. Furthermore, the step of adding bit padding is specified by an expression of NPad=NSYM*NSD-(NMACBYTES*8+16+6). COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
A tone selection module selects tones suitable for use in an orthogonal frequency division multiplexing (OFDM) data transmission device based on several constraints. These constraints include number of available tones, modulation type, and code rate. The OFDM device may use either wired or wireless transmission.
Abstract:
In accordance with various aspects of the disclosure, a method and apparatus are disclosed that includes aspects of a controller configured to create a VHT frame that is arranged to include information relating to a modulation and a coding scheme with which a data portion of the VHT frame is modulated and encoded; and a transmitter configured to transmit the VHT frame to one or more STAs.
Abstract:
By using an exclusive OR operation between two values to create a third value, a wireless communications device may communicate all three values to another device while only transmitting two of the values. In a particular embodiment, a bandwidth-static/dynamic parameter may be conveyed in a Request-to-Send by transmitting a length field and a scrambler seed to be used in the subsequent communication, with the bandwidth-static/dynamic parameter encoded into the scrambler seed. The receiving device may then derive the bandwidth-static/dynamic parameter by performing another XOR on portions of the two received parameters.
Abstract:
In accordance with various aspects of the disclosure, a method and apparatus are disclosed that includes aspects of a controller configured to create a VHT frame that is arranged to include information relating to a modulation and a coding scheme with which a data portion of the VHT frame is modulated and encoded; and a transmitter configured to transmit the VHT frame to one or more STAs.
Abstract:
Embodiments of an OFDM transmitter and method of reducing the effects of interference on subcarriers in an OFDM system by symbol loading are disclosed herein. A linear transformation is performed on a group of two or more input data symbols that are mapped to different signal dimensions to generate a corresponding two or more output data symbols. Each of the output data symbols has an increased number of constellation points. Each output data symbol is configured for transmission within one of the different signal dimensions. The linear transformation is configured so that each of the two or more output data symbols carry the information of each of the input data symbols of the group. This coding together of input data symbols that are mapped to different signal dimensions may provide improved reliability against fading and severe interference. The different signal dimensions may comprise a frequency, a time and/or a space dimension.
Abstract:
Embodiments of a communication station and methods for efficiently providing channel feedback for MIMO communications over an OFDM channel are generally described herein. In some embodiments, receiving stations may perform a recursive differential quantization of channel information across time and/or frequency to generate quantized differential channel feedback. The quantized differential channel feedback from each receiving station may be used by a transmitting station to precode MIMO transmissions to one or more of the receiving stations. The quantized differential channel feedback may be either a quantized differential channel matrix or a quantized differential beamforming matrix.