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JPH08265291A Expired / Lapsed JP ⏱️ 0.0 years remaining

OFDM transmission method and OFDM transmission / reception device

Assignee: Toshiba Corp
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Filing: 1995-03-20
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Granted: —
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Expires: 2015-03-20
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Abstract

Abstract Translated from Japanese (57)【要約】 【目的】小規模回路で基準シンボル相関によるシンボル 同期検出を実現する。 【構成】OFDM信号を直交検波する回路103と、直 交検波出力からヌルシンボルを検出する回路118と、 ヌルシンボル検出出力に基づき入力同期タイミング信号 を発生する回路119と、そのタイミング信号に基づい て直交検波出力から基準シンボル有効部分とその前後数 データを取り込むRAM107,108と、基準シンボ ル有効部分のIまたはQ軸データを発生するROM10 9と、RAM読出し開始位置をオフセットさせながらR OM109からのデータ系列と繰り返し相関演算を行っ て基準シンボルの相関を検出する相関器111,112 と、各相関出力の絶対値を求めて加算し、その加算出力 を順次比較して最大値を検出する回路111〜116 と、最大値検出時のオフセット量からシンボルタイミン グのずれを検出して同期タイミング発生を補正する回路 117とを具備する。 (57) [Abstract] [Purpose] To realize symbol synchronization detection by reference symbol correlation in a small-scale circuit. A circuit 103 for quadrature detection of an OFDM signal, a circuit 118 for detecting a null symbol from a quadrature detection output, A circuit 119 for generating an input synchronization timing signal based on a null symbol detection output, RAMs 107 and 108 for fetching a reference symbol effective portion and data before and after the reference symbol effective portion from an orthogonal detection output based on the timing signal, and I or I of the reference symbol effective portion. ROM 10 for generating Q-axis data 9 and R while offsetting the RAM read start position Correlators 111 and 112 that detect the correlation of the reference symbol by repeatedly performing the correlation calculation with the data sequence from the OM 109. And circuits 111 to 116 for obtaining the absolute value of each correlation output, adding them, and sequentially comparing the added outputs to detect the maximum value. And a circuit 117 for detecting the deviation of the symbol timing from the offset amount when the maximum value is detected and correcting the synchronization timing generation.

Inventors

  • 👤 Takashi Seki
  • 👤 隆史 関
  • 👤 Noboru Taga
  • 👤 昇 多賀
  • 👤 Makoto Sato
  • 👤 佐藤  誠

Bibliographic Details

Application Number —
Jurisdiction JP
Data Source google_patents
Last Synchronized 2026-11-05 17:21
CPC Classifications
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