Communication apparatus and control method
AssigneeKabushiki Kaisha Toshiba
InventorsToshihiro TANGO, Toshinori DOI
Life of this patent
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Abstract
According to one embodiment, a communication apparatus in a distributed antenna system receives an OFDM signal transmitted in a time division multiplexing mode. The communication apparatus converts the OFDM signal into a baseband time-domain waveform signal, calculates a correlation value from a part of the time-domain waveform signal, performs FFT on the time-domain waveform signal, calculates a degree of similarity from a part of a frequency-domain waveform signal resulting from the FFT, estimates a switchover timing between uplink communication and downlink communication based on the degree of similarity, calculates a power of a part of the frequency-domain waveform signal, and displays a result of the power calculation.
Claims5
A communication apparatus in a distributed antenna system, the distributed antenna system comprising a main station apparatus and one or more substation apparatuses, the main station apparatus being connected to a base station, the one or more substation apparatuses being configured to relay a signal between the main station apparatus and a terminal apparatus which communicates with the base station, the communication apparatus being configured to function as the main station apparatus or each of the one or more substation apparatuses and to receive an OFDM signal transmitted in a time division multiplexing mode, the communication apparatus comprising:
- a signal reception unit configured to receive and convert the OFDM signal into a baseband time-domain waveform signal;
- a time waveform calculation unit configured to extract a portion of the time-domain waveform signal output from the signal reception unit and to calculate a correlation value between the extracted signal and a known signal;
- an FFT unit configured to perform FFT on the time-domain waveform signal output from the signal reception unit;
- a frequency waveform calculation unit configured to extract a portion of a frequency-domain waveform signal output from the FFT unit and to calculate a degree of similarity between the extracted signal and a known signal;
- a switchover timing estimation unit configured to estimate a switchover timing between uplink communication and downlink communication in the communication apparatus based on a calculation result by the frequency waveform calculation unit;
- a synchronization signal power calculation unit configured to extract a portion of the frequency-domain waveform signal output from the FFT unit and to calculate a power of the extracted frequency-domain waveform signal;
- and
- a power display unit configured to cause a calculation result by the synchronization signal power calculation unit to be displayed.
A method for controlling a communication apparatus in a distributed antenna system, the distributed antenna system comprising a main station apparatus and one or more substation apparatuses, the main station apparatus being connected to a base station, the one or more substation apparatuses being configured to relay a signal between the main station apparatus and a terminal apparatus which communicates with the base station, the communication apparatus being configured to function as the main station apparatus or each of the one or more substation apparatuses and to receive an OFDM signal transmitted in a time division multiplexing mode, the method comprising:
- receiving and converting the OFDM signal into a baseband time-domain waveform signal;
- extracting a portion of the time-domain waveform signal and calculating a correlation value between the extracted signal and a known signal;
- performing an FFT on the time-domain waveform signal;
- extracting a portion of a frequency-domain waveform signal resulting from the FFT and calculating a degree of similarity between the extracted signal and a known signal;
- estimating a switchover timing between uplink communication and downlink communication in the communication apparatus based on a degree of similarity calculation result;
- extracting a portion of the frequency-domain waveform signal and calculating a power of the extracted frequency-domain waveform signal;
- and
- causing a power calculation result to be displayed.
Dependencies are inferred from the claim text.