OFDM reception apparatus
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorHiroaki Sudo
Life of this patent
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Abstract
Multiplier 103 calculates the correlation value of the received signal with the one-symbol-delayed received signal, integrator 104 integrates the calculated correlation value, subtracter 105 executes subtract processing between the integrated value and an arbitrary threshold level, and decider 106 decides a level of the resultant, fastest timing detection section 107 compares the peak detected timing for each of a plurality of frames received during a predetermined time to each other to select the fastest peak detected timing, and using the selected timing as a processing initiation timing, FFT circuit 108 executes FFT processing on the received signal.
Claims14
An OFDM reception apparatus comprising:
- a timing detector which detects a symbol synchronization timing for each frame of a received signal composed of a plurality of frames;
- a fastest timing selector which selects a fastest symbol synchronization timing from a plurality of symbol synchronization timings detected by said timing detector during a predetermined time;
- and
- a Fourier transformer which executes Fourier transform processing on the received signal using the fastest symbol synchronization timing selected by said fastest timing selector as a processing initiation timing.
An OFDM reception apparatus comprising:
- a timing detector which detects a symbol synchronization timing for each received signal received for each branch of a plurality of branches;
- a fastest timing selector which selects a fastest symbol synchronization timing from a plurality of symbol synchronization timings detected by said timing detector;
- a Fourier transform process controller which sets a symbol synchronization timing selected in said fastest timing selector as an initiation timing applied to Fourier transform processing of the received signal in each branch;
- and
- a demodulator which selects a received signal to be demodulated, which is highest among the received signals in the respective branches subjected to the Fourier transform processing.
A symbol synchronization error reduction method comprising:
- detecting a symbol synchronization timing for each frame of a received signal composed of a plurality of frames;
- selecting a fastest symbol synchronization timing from a plurality of symbol synchronization timings detected by the detecting during a predetermined time;
- and
- executing Fourier transform processing on the received signal using the fastest symbol synchronization timing selected by the selecting as a processing initiation timing.
A symbol synchronization error reduction method comprising:
- detecting a symbol synchronization timing for each of received signals received for each branch of a plurality of branches;
- selecting a fastest symbol synchronization timing from a plurality of symbol synchronization timings detected by the detecting;
- setting a symbol synchronization timing, selected by the fastest symbol synchronization timing selecting, as an initiation timing applied to Fourier transform processing of the received signal in each branch;
- and
- selecting a received signal for demodulation, of which a received level is highest among the received signals in respective branches subjected to the Fourier transform processing.
Dependencies are inferred from the claim text.