Title:
【発明の名称】直交周波数分割多重伝送方式及びそれを用いる送信装置と受信装置
Document Type and Number:
Japanese Patent JP2802255
Kind Code:
B2
Abstract:
Data sequences (D1 through DL) correspond to L different parameter sets (effective symbol length, guard interval length, the number of carrier waves) and transformed into parallel data by respective serial/parallel converters (111 through 11L), which are allocated to respective carrier waves for OFDM and subjected to inverse discrete Fourier transform by inverse discrete Fourier transformers (121 through 12L) to produce sampled values for the transmission waveform in the time domain. The sampled values are transformed into serial sequences of sampled values by parallel/serial converters (131 through 13L) and then into a single temporal sampling sequence by a temporal sampling sequence switching unit (14). A frame synchronizing symbol is added to the temporal sampling sequence and then transformed into an analog base band OFDM signal before it is converted up to a transmission signal. The frequency bandwidth of the OFDM signal is made smaller than a predetermined value defined by the bandwidth of the available transmission channel. As a result, an OFDM signal that can be received well regardless of the mode of reception can be transmitted.
Inventors:
Masanori Saito
Tetsuomi Ikeda
Tetsuomi Ikeda
Application Number:
JP6876896A
Publication Date:
September 24, 1998
Filing Date:
March 25, 1996
Export Citation:
Assignee:
Next Generation Digital Television Broadcasting System Laboratory
International Classes:
H04J11/00; H04L27/26; H04N7/081; H04N7/08; (IPC1-7): H04J11/00; H04N7/08; H04N7/081
Domestic Patent References:
| JP4501348A | ||||
| JP7283806A | ||||
| JP9510330A |
Attorney, Agent or Firm:
Takehiko Suzue