Soft decision correcting method, receiving apparatus, and program



【課題】希望波と干渉波との受信電力差が小さい場合であっても、希望波に生じる干渉を検出し、軟判定値の補正を実行することが可能な軟判定値補正方法、及びその軟判定値補正方法を実行する受信装置、プログラムの提供。 【解決手段】受信装置20では、EVM算出器28が、1番目のOFDMシンボルにおける1番目のサブキャリアに対する一次変調シンボルに対する検出距離を基準とし、受信した受信信号の一次変調シンボルが基準からどの程度離れているのかを表す指標として評価値ΔE l,m を算出する。その評価値ΔE l,m が規定閾値以上であれば、重み制御器29が、受信信号に対し干渉が発生したものと推定して、軟判定値W l 、 m 、 n に重み係数を乗じ、補正された軟判定値V l 、 m 、 n を算出し、デインターリーバ30を介して軟判定値V l 、 m 、 n が入力されたビタビ復号器31が受信ビット列を復号する。 【選択図】図1
PROBLEM TO BE SOLVED: To provide a soft decision value correcting method with which a soft decision value can be corrected by detecting interference that occurs in a desired wave even in a case where a receiving power difference between the desired wave and an interference wave is small, and to provide a receiving apparatus and a program for implementing the soft decision value correcting method. SOLUTION: In the receiving apparatus 20, with a detection distance for a primary modulation symbol corresponding to a first subcarrier in a first OFDM symbol as a reference, an EVM calculator 28 calculates an evaluation value ΔE l,m as an index representing how much a primary modulation symbol of a received signal is separated from the reference. If the evaluation value ΔE l,m is equal with or more than a specified threshold value, a weight controller 29 estimates that interference occurs for the received signal, and multiplies soft decision values W l , W m , W n by a weight coefficient to calculate corrected soft decision values V l , V m , V n . A Viterbi decoder 31 to which the soft decision values V l , V m , V n are inputted via a deinterleaver 30, decodes a received bit stream. COPYRIGHT: (C)2008,JPO&INPIT




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Patent Citations (3)

    Publication numberPublication dateAssigneeTitle
    JP-2001044965-AFebruary 16, 2001Toshiba Corp, 株式会社東芝周波数選択性妨害に対応する誤り訂正装置
    JP-2001156738-AJune 08, 2001Toshiba Corp, 株式会社東芝Ofdmダイバーシチ受信装置
    JP-2005318052-ANovember 10, 2005Matsushita Electric Ind Co Ltd, 松下電器産業株式会社Branch metric computation method

NO-Patent Citations (0)


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