Diversity system and diversity method
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsYoshitaka Mizoguchi, Akira Kisoda
Life of this patent
Estimating the term…
Abstract
A synchronous signal position detection unit detects symbol synchronous signals according to OFDM from the signals received by the respective antennas. A delay measurement unit measures a relative delay between the symbol synchronous signals for each antenna series and makes a notice to a memory unit via a delay amount notification unit. A diversity operation implementation unit temporally aligns the carrier data positions of the OFDM symbols for each antenna series so as to implement a space diversity operation.
Claims14
A diversity system for implementing space diversity for each carrier in an OFDM signal demodulation system having a plurality of antennas, comprising:
- symbol synchronous signal position detection units which are provided for the respective antenna series, and which detect symbol synchronous signals of OFDM symbols;
- carrier demodulators which are provided for the respective antenna series, and which demodulate carriers of OFDM, and calculate reliability of each of said carriers;
- a delay measurement unit which measures the amount of relative delay between the antenna series on the basis of said symbol synchronous signals of said antenna series;
- a delay amount notification unit which outputs the amount of relative delay obtained by said delay measurement unit;
- at least one memory unit which temporarily holds carriers of the antenna series in which at least the position detection of a synchronous signal is earlier than that of other series;
- and
- a diversity operation implementation unit which takes out the carriers held in said memory unit on the basis of the amount of relative delay received from said delay amount notification unit, which temporally aligns the positions of the carriers obtained from the respective antenna series, and which selects or combines for each carrier.
A diversity method for implementing space diversity for each carrier in an OFDM signal demodulation system having a plurality of antennas, comprising the steps of:
- detecting symbol synchronous signals of OFDM symbols with respect to the signals received by the respective antenna series;
- demodulating the carriers of OFDM in the respective antenna series and calculating reliability for each of said carriers;
- measuring the amount of relative delay between the antenna series on the basis of said symbol synchronous signals of said respective antenna series;
- outputting the amount of relative delay obtained by said delay measurement;
- temporarily holding carriers of the antenna series in which at least position detection of a synchronous signal is early relative to the carriers of OFDM demodulated through said carrier demodulation of the respective antenna series in at least one memory unit;
- taking out the carriers held by said memory unit on the basis of said amount of relative delay;
- and
- temporally aligning the positions of the carriers obtained from the respective antenna series and selecting or combining for each carrier.
Dependencies are inferred from the claim text.