Abstract: A method for installing a radio wave sensor configured to radiate a radio wave to a range including a target area that is set for detection of an object. The method includes: a step of installing a reference object; and a step of adjusting a radio wave radiation direction of the radio wave sensor, using the reference object as a reference. The reference object is installed at a first position outside the target area.

Abstract: A radar antenna of the disclosure is a radar antenna unit including a receiving antenna configured to receive a reflected wave of a radar wave. The receiving antenna includes a plurality of receiving antenna elements arranged at an interval so as to form a row along a first direction. The plurality of receiving antenna elements include a first end antenna element positioned at a first end of the row, a second end antenna element positioned at a second end of the row, and a plurality of intermediate antenna elements positioned between the first end antenna element and the second end antenna element. Of a plurality of the intervals between the plurality of receiving antenna elements, at least one interval differs from other interval. The plurality of receiving antenna elements are disposed such that PL+PR?PAVG×2 holds. PAVG is from 0.8 ?0 to 1.2 ?0. PL is a first end interval.

Abstract: A storage unit stores a preamble signal defined in a legacy system and a preamble signal defined in a MIMO system. A monitoring unit in a transmitting apparatus monitors the existence of any communication apparatus which is not compatible with the MIMO system but accepts the legacy system. A channel characteristics acquiring unit derives the characteristics of a radio channel between the transmitting apparatus and a receiving apparatus. A selector selects a packet format based on a monitoring result obtained by the monitoring unit. The selector also selects where to place LTS, based on the characteristics of wireless channel derived by the channel characteristics acquiring unit.

Abstract: A storage unit stores a preamble signal defined in a legacy system and a preamble signal defined in a MIMO system. A monitoring unit in a transmitting apparatus monitors the existence of any communication apparatus which is not compatible with the MIMO system but accepts the legacy system. A channel characteristics acquiring unit derives the characteristics of a radio channel between the transmitting apparatus and a receiving apparatus. A selector selects a packet format based on a monitoring result obtained by the monitoring unit. The selector also selects where to place LTS, based on the characteristics of wireless channel derived by the channel characteristics acquiring unit.

Abstract: A storage unit stores a preamble signal defined in a legacy system and a preamble signal defined in a MIMO system. A monitoring unit in a transmitting apparatus monitors the existence of any communication apparatus which is not compatible with the MIMO system but accepts the legacy system. A channel characteristics acquiring unit derives the characteristics of a radio channel between the transmitting apparatus and a receiving apparatus. A selector selects a packet format based on a monitoring result obtained by the monitoring unit. The selector also selects where to place LTS, based on the characteristics of wireless channel derived by the channel characteristics acquiring unit.

Abstract: A storage unit stores a preamble signal defined in a legacy system and a preamble signal defined in a MIMO system. A monitoring unit in a transmitting apparatus monitors the existence of any communication apparatus which is not compatible with the MIMO system but accepts the legacy system. A channel characteristics acquiring unit derives the characteristics of a radio channel between the transmitting apparatus and a receiving apparatus. A selector selects a packet format based on a monitoring result obtained by the monitoring unit. The selector also selects where to place LTS, based on the characteristics of wireless channel derived by the channel characteristics acquiring unit.

Abstract: A storage unit stores a preamble signal defined in a legacy system and a preamble signal defined in a MIMO system. A monitoring unit in a transmitting apparatus monitors the existence of any communication apparatus which is not compatible with the MIMO system but accepts the legacy system. A channel characteristics acquiring unit derives the characteristics of a radio channel between the transmitting apparatus and a receiving apparatus. A selector selects a packet format based on a monitoring result obtained by the monitoring unit. The selector also selects where to place LTS, based on the characteristics of wireless channel derived by the channel characteristics acquiring unit.

Abstract: A storage unit stores a preamble signal defined in a legacy system and a preamble signal defined in a MIMO system. A monitoring unit in a transmitting apparatus monitors the existence of any communication apparatus which is not compatible with the MIMO system but accepts the legacy system. A channel characteristics acquiring unit derives the characteristics of a radio channel between the transmitting apparatus and a receiving apparatus. A selector selects a packet format based on a monitoring result obtained by the monitoring unit. The selector also selects where to place LTS, based on the characteristics of wireless channel derived by the channel characteristics acquiring unit.

Abstract: A storage unit stores a preamble signal defined in a legacy system and a preamble signal defined in a MIMO system. A monitoring unit in a transmitting apparatus monitors the existence of any communication apparatus which is not compatible with the MIMO system but accepts the legacy system. A channel characteristics acquiring unit derives the characteristics of a radio channel between the transmitting apparatus and a receiving apparatus. A selector selects a packet format based on a monitoring result obtained by the monitoring unit. The selector also selects where to place LTS, based on the characteristics of wireless channel derived by the channel characteristics acquiring unit.

Abstract: A storage unit stores a preamble signal defined in a legacy system and a preamble signal defined in a MIMO system. A monitoring unit in a transmitting apparatus monitors the existence of any communication apparatus which is not compatible with the MIMO system but accepts the legacy system. A channel characteristics acquiring unit derives the characteristics of a radio channel between the transmitting apparatus and a receiving apparatus. A selector selects a packet format based on a monitoring result obtained by the monitoring unit. The selector also selects where to place LTS, based on the characteristics of wireless channel derived by the channel characteristics acquiring unit.

Abstract: A storage unit stores a preamble signal defined in a legacy system and a preamble signal defined in a MIMO system. A monitoring unit in a transmitting apparatus monitors the existence of any communication apparatus which is not compatible with the MIMO system but accepts the legacy system. A channel characteristics acquiring unit derives the characteristics of a radio channel between the transmitting apparatus and a receiving apparatus. A selector selects a packet format based on a monitoring result obtained by the monitoring unit. The selector also selects where to place LTS, based on the characteristics of wireless channel derived by the channel characteristics acquiring unit.

Abstract: A storage unit stores a preamble signal defined in a legacy system and a preamble signal defined in a MIMO system. A monitoring unit in a transmitting apparatus monitors the existence of any communication apparatus which is not compatible with the MIMO system but accepts the legacy system. A channel characteristics acquiring unit derives the characteristics of a radio channel between the transmitting apparatus and a receiving apparatus. A selector selects a packet format based on a monitoring result obtained by the monitoring unit. The selector also selects where to place LTS, based on the characteristics of wireless channel derived by the channel characteristics acquiring unit.

Abstract: A frequency offset correcting unit estimates frequency offsets in a preamble period, corrects digital received signals by the estimated initial frequency and further corrects them by residual frequency signals. A receiving weight vector computing unit computes receiving weight vector signals by using LMS algorithm. Based on the error vectors or receiving weight vector signals derived by LMS algorithm, the frequency offsets contained in corrected received signals are also estimated and are outputted as the residual frequency signals. A multiplier weights the corrected received signals with the receiving weight vector signals. An adder sums up outputs of the multiplier so as to output a synthesized signal.

Abstract: An A-D conversion unit performs analog-to-digital conversions on baseband signals. A correlation processing unit carries out a correlation processing. A power computing unit computes the power of correlation values. An inter-signal condition determining unit compares a relationship between the peak of a main signal and the peak of sub-signals to a first condition, and excludes, from combining diversity, baseband signals corresponding to the sub-signals if the relationship does not satisfy the first condition. An intra-signal condition determining unit 30 compares the main signals and sub-signals to a second condition, respectively, and excludes signals from combining diversity if the signals do not satisfy the second condition. A timing adjusting unit adjusts the timing of sub-signals so that the timing thereof comes close to the timing of the main signal. A shift unit shifts the timing of sampled signals corresponding to the sub-signals.

Abstract: An antenna selector selects one antenna during an interval of control signal. A receiving weight vector computing unit computes receiving weight vectors. During an interval of data signal, a multiplier in a signal processing unit weights digital received signals with the receiving weight vectors so as to output composite signals. During an interval of control signal, a switch selects an output signal from the antenna selector as an output signal from a signal processing unit whereas during the interval of data signal it selects the composite signal. A carrier control unit outputs carrier recovered by a carrier recovery unit. A multiplier in a modem unit multiplies signal-processing-output-unit signals by signals from the carrier control unit.

Abstract: A measuring unit selects as a representative signal a signal whose received power is the largest among digital received signals in a training signal period, and regards the remaining signals as signals to be processed. Based on a representative notifying signal, a classification unit rearranges the orders of digital received signals after the end of a training signal period. In a synthesizing unit, a multiplier weights the digital received signals with receiving weight vector signals so as to generate multiplication signals which will be summed up in an adder. A receiving weight vector signal computing unit computes receiving weight vector signals by using an adaptive algorithm, over the training signal period of time. After the end of a training signal period, the receiving weight vector signals are updated based on the multiplication signals.

Abstract: A storage unit stores a preamble signal defined in a legacy system and a preamble signal defined in a MIMO system. A monitoring unit in a transmitting apparatus monitors the existence of any communication apparatus which is not compatible with the MIMO system but accepts the legacy system. A channel characteristics acquiring unit derives the characteristics of a radio channel between the transmitting apparatus and a receiving apparatus. A selector selects a packet format based on a monitoring result obtained by the monitoring unit. The selector also selects where to place LTS, based on the characteristics of wireless channel derived by the channel characteristics acquiring unit.

Abstract: A storage unit stores a preamble signal defined in a legacy system and a preamble signal defined in a MIMO system. A monitoring unit in a transmitting apparatus monitors the existence of any communication apparatus which is not compatible with the MIMO system but accepts the legacy system. A channel characteristics acquiring unit derives the characteristics of a radio channel between the transmitting apparatus and a receiving apparatus. A selector selects a packet format based on a monitoring result obtained by the monitoring unit. The selector also selects where to place LTS, based on the characteristics of wireless channel derived by the channel characteristics acquiring unit.

Abstract: An A-D conversion unit performs analog-to-digital conversions on baseband signals. A correlation processing unit carries out a correlation processing. A power computing unit computes the power of correlation values. An inter-signal condition determining unit compares a relationship between the peak of a main signal and the peak of sub-signals to a first condition, and excludes, from combining diversity, baseband signals corresponding to the sub-signals if the relationship does not satisfy the first condition. An intra-signal condition determining unit 30 compares the main signals and sub-signals to a second condition, respectively, and excludes signals from combining diversity if the signals do not satisfy the second condition. A timing adjusting unit adjusts the timing of sub-signals so that the timing thereof comes close to the timing of the main signal. A shift unit shifts the timing of sampled signals corresponding to the sub-signals.

Abstract: A frequency offset correcting unit estimates frequency offsets in a preamble period, corrects digital received signals by the estimated initial frequency and further corrects them by residual frequency signals. A receiving weight vector computing unit computes receiving weight vector signals by using LMS algorithm. Based on the error vectors or receiving weight vector signals derived by LMS algorithm, the frequency offsets contained in corrected received signals are also estimated and are outputted as the residual frequency signals. A multiplier weights the corrected received signals with the receiving weight vector signals. An adder sums up outputs of the multiplier so as to output a synthesized signal.