JP2016181738A - ターボ等化器および無線受信装置 - Google Patents
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Abstract
【解決手段】第1の雑音分散推定部104は、チャネル推定値に基づいて第1の雑音分散推定値を算出する。第2の雑音分散推定部118は、時間領域被等化残留干渉成分を用いて第2の雑音分散推定値を算出する。第1の雑音分散選択部120および第2の雑音分散選択部122は、第1の雑音分散推定値と第2の雑音分散推定値のいずれか一方、あるいは、2つの雑音分散推定値の平均値を選択する。フィルタ係数算出部112は、周波数伝達関数および第1の雑音分散選択部120の選択結果である第1の雑音分散選択値に基づいてフィルタ係数を算出する。外部LLR算出部126は、第2の雑音分散選択部122の選択結果である第2の雑音分散選択値および再生信号に基づいて外部LLRを算出する。
【選択図】図1
Description
20 無線受信装置
100 ターボ等化器
102 チャネル推定部
104 第1の雑音分散推定部
106 第1のフーリエ変換部
108 第2のフーリエ変換部
110 ソフトキャンセラ
112 フィルタ係数算出部
114 MMSEフィルタ
116 逆フーリエ変換部
118 第2の雑音分散推定部
120 第1の雑音分散選択部
122 第2の雑音分散選択部
124 加算部
126 外部LLR算出部
128 デインターリーバ
130 LDPC復号部
132 インターリーバ
134 ソフトシンボル生成部
136 第3のフーリエ変換部
138 ソフトレプリカ生成部
140 ADC
200 無線受信部
202 アンテナ
Claims (10)
- チャネル推定値に基づいて第1の雑音分散推定値を算出する第1の雑音分散推定部と、
MMSEフィルタにより等化された信号を用いて第2の雑音分散推定値を算出する第2の雑音分散推定部と、
前記第1の雑音分散推定値と前記第2の雑音分散推定値のいずれか一方、あるいは、前記第1の雑音分散推定値及び前記第2の雑音分散推定値の平均値を、第1の判断基準に基づいて選択し、第1の雑音分散選択値として出力する第1の雑音分散選択部と、
前記第1の雑音分散推定値と前記第2の雑音分散推定値のいずれか一方、あるいは、前記第1の雑音分散推定値及び前記第2の雑音分散推定値の平均値を、第2の判断基準に基づいて選択し、第2の雑音分散選択値として出力する第2の雑音分散選択部と、
前記第1の雑音分散選択値を用いてMMSEフィルタのフィルタ係数を算出するフィルタ係数算出部と、
前記第2の雑音分散選択値を用いてLDPC復号に用いる対数尤度比を算出する対数尤度比算出部と、
を具備するターボ等化器。 - 前記第1の雑音分散選択部は、ターボ等化の反復処理における初回演算時と2回目以降の演算時とでは、前記第1の判断基準が異なり、
前記第2の雑音分散選択部は、ターボ等化の反復処理における初回演算時と2回目以降の演算時とでは、前記第2の判断基準が異なる、
請求項1に記載のターボ等化器。 - 前記第1の雑音分散選択部は、ターボ等化の反復処理における初回演算時には、前記第1の雑音分散推定値を選択し、前記第1の雑音分散選択値として出力する、
請求項2に記載のターボ等化器。 - 前記第1の雑音分散選択部は、ターボ等化の反復処理における2回目以降の演算時には、前記第1の雑音分散推定値と前記第2の雑音分散推定値の大小関係に基づいて、いずれか1つを選択し、前記第1の雑音分散選択値として出力する、
請求項2に記載のターボ等化器。 - 前記第1の雑音分散選択部は、ターボ等化の反復処理における2回目以降の演算時には、前記第1の雑音分散推定値と前記第2の雑音分散推定値の平均値を前記第1の雑音分散選択値として出力する、
請求項2に記載のターボ等化器。 - 前記第2の雑音分散選択部は、ターボ等化の反復処理において、前記第2の雑音分散推定値の入力以前であり、初回の対数尤度比の演算が開始された後には、前記第1の雑音分散推定値を選択し、前記第2の雑音分散選択値として出力する、
請求項2に記載のターボ等化器。 - 前記第2の雑音分散選択部は、ターボ等化の反復処理において、前記第2の雑音分散推定値の入力以前であり、初回の対数尤度比の演算が開始される前、又は、2回目以降の対数尤度比の演算時には、前記第1の雑音分散推定値と前記第2の雑音分散推定値の大小関係に基づいて、いずれか1つを選択し、前記第2の雑音分散選択値として出力する、
請求項2に記載のターボ等化器。 - 前記第2の雑音分散選択部は、ターボ等化の反復処理において、前記第2の雑音分散推定値の入力以前であり、初回の対数尤度比の演算が開始される前、又は、2回目以降の対数尤度比の演算時には、前記第1の雑音分散推定値と前記第2の雑音分散推定値の平均値を前記第2の雑音分散選択値として出力する、
請求項2に記載のターボ等化器。 - 受信信号に含まれる既知信号列と予め用意してある基準既知信号列との相関演算によりチャネル推定値を算出するチャネル推定部、
をさらに具備する請求項1から8のいずれか一項に記載のターボ等化器。 - アナログ受信信号に対してアナログ/デジタル変換処理を行い、デジタルの受信信号を出力するアナログ/デジタル変換部と、
前記デジタルの受信信号に対してターボ等化処理を行うターボ符号器と、
を具備し、
前記ターボ符号器は、
チャネル推定値に基づいて第1の雑音分散推定値を算出する第1の雑音分散推定部と、
MMSEフィルタにより等化された信号を用いて第2の雑音分散推定値を算出する第2の雑音分散推定部と、
前記第1の雑音分散推定値と前記第2の雑音分散推定値のいずれか一方、あるいは、前記第1の雑音分散推定値及び前記第2の雑音分散推定値の平均値を、第1の判断基準に基づいて選択し、第1の雑音分散選択値として出力する第1の雑音分散選択部と、
前記第1の雑音分散推定値と前記第2の雑音分散推定値のいずれか一方、あるいは、前記第1の雑音分散推定値及び前記第2の雑音分散推定値の平均値を、第2の判断基準に基づいて選択し、第2の雑音分散選択値として出力する第2の雑音分散選択部と、
前記第1の雑音分散選択値を用いてMMSEフィルタのフィルタ係数を算出するフィルタ係数算出部と、
前記第2の雑音分散選択値を用いてLDPC復号に用いる対数尤度比を算出する対数尤度比算出部と、
を含む、
無線受信装置。
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