JP4178696B2 - Mobile station side communication apparatus using CDMA system - Google Patents

Description

【００３１】
「電圧の乗数」信号ＥＫ₁〜ＥＫ_Nは、各チャネルのデータ信号Ｓ₁〜Ｓ_Nを変調処理した後の各チャネルの振幅電圧の和、すなわち直交変調部４０への出力振幅電圧を一定にするために用いられる。以下、この点について３チャネルのデータ信号Ｓ₁、Ｓ₂、Ｓ₃を例にとり、図２を参照して説明する。
【００３２】
図２において、３チャネルのデータ信号に対して電力制御信号Ｐ₁、Ｐ₂、Ｐ₃（最大電力を１としたとき、すなわち１に正規化したときの値で、図ではそれぞれ０．９、０．７、０．６で示されている）がそれぞれ設定されている。電力制御係数決定部８０は、電力制御信号Ｐ₁、Ｐ₂、Ｐ₃の比から、電圧の比に換算（電力の比が０．９：０．７：０．６の場合、電圧の比は例えば０．９：０．８：０．７となる）する。換算したそれぞれの電圧の和ｘは、２．４であるから、それぞれの電圧の比の値ＥＫ₁、ＥＫ₂、ＥＫ₃は、０．９／２．４、０．８／２．４、０．７／２．４となる。
【００３３】
そして、第１電力制御部２０₁〜２０_Nにおいて、データ信号Ｓ₁、Ｓ₂、Ｓ₃と「電圧の乗数」ＥＫ₁、ＥＫ₂、ＥＫ₃をそれぞれ乗算し、その和を加算部３０で求めるようにすれば、その加算結果、すなわち直交変調部４０に入力される振幅電圧は一定になる。すなわち、正規化される。
【００３４】
従って、上記した説明から理解されるように、第１電力制御部２０₁〜２０_Nの処理により、電力制御信号Ｐ₁〜Ｐ_Nで定義されるチャネル毎の電力比Ｐ_l：Ｐ₂…：Ｐ_Nを振幅電圧比とするように、各チャネルの振幅電圧を変化させ、変調処理した後の各チャネルの振幅電圧の和すなわち直交変調器への出力振幅電圧を一定にする。
【００３５】
また、上記したように各チャネルの振幅電圧を変化させたままにすると、送信電力が小さくなるため、各チャネルの電力を元に戻す必要がある。ここで、１チャネルだけの送信電力に対し、Ｎチャネル同時に送信を行うときの送信電力がＮ倍になるのであれば、電力制御信号Ｐ₁〜Ｐ_Nの和の分だけ送信電力を大きくすればよく、電力制御信号Ｐ₁〜Ｐ_Nの和が、「全チャネル電圧の乗数」信号ＥＡとなる。
【００３６】
しかし、Ｎチャネル同時に送信を行うときの送信電力がＮ倍にならないときには、数式２から「全チャネル電圧の乗数」信号ＥＡが求められる。
【００３７】
【数２】

【００３８】
ここで、α_(N)は、チャネル数Ｎによって異なる最大送信電力（１チャネルだけの時の送信電力を１とした場合の値）を示す。例えば、図２の３チャネルの場合に、α₍₃₎＝３．４とすると、「全チャネル電圧の乗数」信号ＥＡは、３．４×２．４／３となる。なお、数式２において、Ｎチャネル同時に送信を行うときの送信電力がＮ倍になる場合には、α_(N)＝Ｎとなり、電力制御信号Ｐ₁〜Ｐ_Nの和となる。
【００３９】
第２電力制御部６０は、ミキサ部５０の出力であるチャネル毎のデータ信号を、「全チャネル電圧の乗数」信号ＥＡにより増幅する。このことにより、電力制御信号Ｐ₁〜Ｐ_N に応じた電力で各チャネルのデータが送信される。
【００４０】
上記した実施形態によれば、第１電力制御部２０₁〜２０_N、第２電力制御部６０、および電力制御係数決定部８０を具備しているため、チャネル毎に独立して２段階で電力制御を行うことができる。
【００４１】
また、直交変調前の入力である多重したデータ信号の総振幅電圧が一定となるので、直交変調時の入力は広範囲の振幅電圧をカバーしなくてもよく、小型化、低コスト化ができる。
【００４２】
以下、図１に示す各部の具体的な構成について説明する。
（電力制御係数決定部８０について）
［電力制御係数決定部８０の第１の具体例］
図３に、電力制御係数決定部８０の第１の具体例を示す。この例では、電力制御係数決定部８０は、第１演算回路８１と第２演算回路８２とから構成されている。第１演算回路８１は、電力制御信号Ｐ₁〜Ｐ_N から上記した数式１を用いて「電圧の乗数」信号ＥＫ₁〜ＥＫ_N を求める。また、第２演算回路８２は、電力制御信号Ｐ₁〜Ｐ_N とチャネル数Ｎから上記した数式２を用いて「全チャネル電圧の乗数」信号ＥＡを求める。なお、第１演算回路８１、第２演算回路８２は、加算器等の演算器を用いて構成されている。
【００４３】
［電力制御係数決定部８０の第２の具体例］
図４に、電力制御係数決定部８０の第２の具体例を示す。この例では、電力制御係数決定部８０は、第１ＲＯＭ８３と第２ＲＯＭ８４とから構成されるテーブル・ルック・アップ回路となっている。
【００４４】
第１ＲＯＭ８３は、電力制御信号Ｐ₁〜Ｐ_Nをアドレスとし、各チャネルの「電圧の乗数」ＥＫ₁〜ＥＫ_Nをテーブル値として保持する。図５（ａ）に、第１ＲＯＭ８３内の第１テーブルの構成を示す。また、第２ＲＯＭ８４は、電力制御信号Ｐ₁〜Ｐ_Nとチャネル数Ｎの連接をアドレスとし、「全チャネル電圧の乗数」ＥＡをテーブル値として保持する。図５（ｂ）に、第２ＲＯＭ８４内の第２テーブルの構成を示す。
【００４５】
電力制御信号Ｐ₁〜Ｐ_Nにより第１テーブルを参照して「電圧の乗数」ＥＫ₁〜ＥＫ_Nが求められ、電力制御信号Ｐ₁〜Ｐ_Nとチャネル数Ｎにより第２テーブルを参照して「全チャネル電圧の乗数」ＥＡが求められる。このようにテーブル・ルック・アップ回路を用い、アドレス指定のみでデータが抽出できるので、第１の具体例に比べ、処理が高速で、かつ構成を簡単にすることができる。
【００４６】
［電力制御係数決定部８０の第３の具体例］
図６に、電力制御係数決定部８０の第３の具体例を示す。この例では、電力制御係数決定部８０は、第１加算器８５と、選択器８６と、第３ＲＯＭ８７と、第４ＲＯＭ８８とから構成されるテーブル・ルック・アップ回路となっている。
【００４７】
第１加算器８５は、電力制御信号Ｐ₁〜Ｐ_Nの総和ＡＰを計算して出力する。選択器８６は、各チャネルの電力制御信号Ｐ_i（ｉは１〜Ｎのうちの任意の数を表す）を順次選択する。第３ＲＯＭ８７は、電力制御信号Ｐ₁〜Ｐ_Nの総和ＡＰと電力制御信号Ｐ_iの連接をアドレスとし、各チャネルの「電圧の乗数」ＥＫ₁〜ＥＫ_Nをテーブル値として保持する。図７（ａ）に、第３ＲＯＭ８７の内部データである第３テーブルを示す。第４ＲＯＭ８８は、電力制御信号Ｐ₁〜Ｐ_Nの総和ＡＰとチャネル数Ｎの連接をアドレスとし、「全チャネル電圧の乗数」ＥＡをテーブル値として保持する。図７（ｂ）に、第４ＲＯＭ８８の内部データである第４テーブルを示す。
【００４８】
この第３の具体例によれば、第２の具体例に比べ、２つのテーブルを小型化できる。特に、第３ＲＯＭ８７に関しては、図７（ａ）に示すように、全てのチャネルの「電圧の乗数」ＥＫ₁〜ＥＫ_Nを、１つの第３テーブルを参照して簡単に得ることができるので、チャネル数が多い程、小型化の効果が大きくなる。
（第１電力制御部２０₁〜２０_Nについて）
図８に、第１電力制御部２０₁〜２０_Nの具体的な構成を示す。第１電力制御部２０₁〜２０_Nは、チャネル数Ｎと同数の乗算器２１₁〜２１_Nから構成されている。チャネル毎の乗算器２１_iは、データ信号Ｓ_iと「電圧の乗数」ＥＫ_iを入力とし、各々を乗算した結果を出力する。
（第２電力制御部６０について）
図９に、第２電力制御部６０の具体的な構成を示す。第２電力制御部６０は、増幅器（オペアンプ）６１と、ＤＡ(Digital-Analog)変換器６２と、増幅係数演算回路６３とからなる回路が、１セット設けられている。
【００４９】
増幅係数演算回路６３は、「全チャネル電圧の乗数」ＥＡから増幅係数ＰＫを演算する演算器であり、増幅部７０からの出力電力と電力制御信号とが整合するように実験的に求めた関数に従って演算する。この増幅係数演算回路６３から出力される増幅係数ＰＫは、ＤＡ変換器６２でアナログ信号に変換され、増幅器６１の反転入力端子に入力される。増幅器６１の非反転入力端子には、ミキサ部５０の出力であるデータ信号Ｓが入力される。そして、増幅器６１は、増幅係数ＰＫの値に応じた増幅率で、電力制御された信号データを出力する。
【００５０】
上記した増幅係数演算回路６３としては、以下に示す種々の変形例を採用することができる。
【００５１】
［増幅係数演算回路６３の第１の変形例］
図１０に、増幅係数演算回路６３の第１の変形例を示す。この例では、増幅係数演算回路６３は、第５ＲＯＭ６３１から構成されるテーブル・ルック・アップ回路となっており、予め「全チャネル電圧の乗数」ＥＡをポインタとした増幅係数ＰＫをテーブルの要素として記憶しており、これを参照して増幅係数ＰＫを決定する。図１１に、第５ＲＯＭ６３１内の第５テーブルの構成を示す。
【００５２】
図９に示すもののように増幅係数演算回路６３を演算器で構成した場合には、実験的に求めた関数が非線形等で容易に回路化できないと、回路規模が大きくなってしまうが、この例に示すようなテーブル・ルック・アップ回路にすることで、容易に回路化することができる。また、回路規模の小型化も可能である。
【００５３】
この増幅係数演算回路６３は、図１２に示すようには第２電力制御部６０から独立して設けられていてもよい。また図６に示す電力制御係数決定部８０において第４ＲＯＭ８８に図１３に示すテーブルを設け、「全チャネル電圧の乗数」ＥＡの代わりに増幅係数ＰＫを直接求めるようにしてもよい。このように増幅係数ＰＫを直接を求めるようにすれば、回路の小型化を図ることができる。
【００５４】
［増幅係数演算回路６３の第２の変形例］
図１４に、増幅係数演算回路６３の第２の変形例を示す。この例では、図１０に示す第５ＲＯＭ６３１に加え、第６ＲＯＭ６３２および第３演算回路６３３が設けられている。第６ＲＯＭ６３２は、チャネル数が２チャネル以上の場合のチャネル毎のオフセット値を第６テーブル（図１５参照）として記憶している。
【００５５】
この例においては、「全チャネル電圧の乗数」ＥＡにより第５ＲＯＭ６３１から抽出した値と、チャネル数により第６ＲＯＭ６３２から抽出したオフセット値とを、第３演算回路６３３で演算（例えば加算）することで増幅係数ＰＫを求めている。言い換えれば、「全チャネル電圧の乗数」ＥＡにより第５ＲＯＭ６３１から抽出した増幅係数を、上記したオフセット値により補正して増幅係数ＰＫが出力されるようになっている。
【００５６】
各チャネルを多重すると、相互に強調し合う部位と打ち消し合う部位が発生する。特に、打ち消し合う部位では、所望の振幅を維持することができず平均電力が所望値を下回る。そこで、この例に示すように、多重チャネルに応じてオフセットをつけることで、平均電力を持ち上げ、所望の送信電力での転送を可能にすることができる。
【００５７】
［増幅係数演算回路６３の第３の変形例］
図１６に、増幅係数演算回路６３の第３の変形例を示す。この例では、第２の変形例における第６ＲＯＭ６３２、第３演算回路６３３の代わりに、第１減算器６３４、第２乗算器６３５、および第２加算器６３６が設けられている。また、この増幅係数演算回路６３は、１チャネルのみ送信する場合の、ある１つの「全チャネル電圧の乗数」ＥＡ₀における増幅係数を初期値ＰＫ₀として保持している。
【００５８】
第１減算器６３４は、ある１つの「全チャネル電圧の乗数」ＥＡ₀と現状（現在）の「全チャネル電圧の乗数」ＥＡとを入力とし、減算してＥＡの変化分ΔＥＡを計算して出力する。第２乗算器６３５は、「全チャネル電圧の乗数」ＥＡが最小制御幅変動した場合の変化量をΔＰとして、ΔＥＡとΔＰを乗算して出力する。そして、第２加算器６３６は、チャネル数により第６テーブルから抽出したオフセット値と、増幅係数の初期値ＰＫ₀と、第２乗算器の出力信号（ΔＥＡ×ΔＰ）を加算して増幅係数ＰＫを出力する。
【００５９】
すなわち、この例においては、初期増幅係数ＰＫ₀に、ＥＡの変化の変化に対する増幅係数の変化分（ΔＥＡ×ΔＰ）を加えて増幅係数を生成し、この増幅係数を、第６テーブルから抽出したオフセット値により補正して、増幅係数ＰＫを出力するように構成されている。
【００６０】
求めるべき事象が線形近似できる場合は、この例のように、初期値を与え、変化分を求めて初期値に加減算することで所望値を求める方が、テーブル・ルック・アップ回路で構成する場合よりも小型化することができる。
【００６１】
［増幅係数演算回路６３の第４の変形例］
図１７に、増幅係数演算回路６３の第４の変形例を示す。この例では、第２の変形例における第５ＲＯＭ６３１および第６ＲＯＭ６３２に加え、第７ＲＯＭ６３７および第８ＲＯＭ６３８が設けられており、チャネル数、チャネルの拡散コードの組み合わせ、およびチャネルの伝送レートの組み合わせの違いにより増幅係数ＰＫを変化させるようにしている。
【００６２】
第７ＲＯＭ６３７は、チャネルの拡散コードの組み合わせ毎のオフセット値を第７テーブル（図１８（ａ）参照）として記憶している。また、第８ＲＯＭ６３８は、チャネルの伝送レートの組み合わせ毎のオフセット値を第８テーブル（図１８（ｂ））として記憶している。
【００６３】
この例においては、「全チャネル電圧の乗数」ＥＡにより第５ＲＯＭ６３１から抽出した値と、チャネル数により第６ＲＯＭ６３２から抽出したオフセット値と、拡散コードの組み合わせにより第７ＲＯＭ６３７から抽出した値と、伝送レートの組み合わせにより第８ＲＯＭ６３８から抽出した値とを、第４演算回路６３９で演算（例えば加算）することで増幅係数ＰＫを求める。伝送レート、チャネル数、拡散コードは送信電力に影響を及ぼすため、これらの補正を加えることで、より精度良く送信電力を制御することができる。
【００６４】
なお、この例においては、チャネルの拡散コードのオフセット値とチャネルの伝送レートの両方を用いるものを示したが、そのいずれか一方のみでもよく、また第５ＲＯＭ６３１の代わりに、図１６で示した第１減算器６３４、第２乗算器６３５、および初期値ＰＫ₀を用いた構成を採用してもよい。
（通信装置の他の実施形態）
図１９に、本発明の他の実施形態にかかる通信装置のブロック構成を示す。この実施形態にかかる通信装置は、図１に示す実施形態に対し、電力制御信号Ｐ₁〜Ｐ_Nが外部からのチャネル毎の電力増減信号ＴＰＣ₁〜ＴＰＣ_Nにより制御されるようになっている点が異なる。このため、この実施形態においては、クローズド・ループ制御回路９０が設けられている。このクローズド・ループ制御回路９０は、電力増減信号ＴＰＣ₁〜ＴＰＣ_Nと電力制御信号Ｐ₁〜Ｐ_Nから、クローズド・ループ制御後のチャネル毎の電力制御信号ＣＬＰ₁〜ＣＬＰ_Nを求める。
【００６５】
図２０に、クローズド・ループ制御回路９０の具体的な構成を示す。クローズド・ループ制御回路９０は、第１選択器９１と、第３加算器９２と、第４加算器９３と、遅延器９４と、パターン検出器９５と、第２選択器９６とからなる回路が、チャネル毎にＮセット設けられた構成になっている。
【００６６】
第１選択器９１は、電力増減信号ＴＰＣ_iがｕｐの場合は所定量Ｄ、ｄｏｗｎの場合は所定量Ｄの負数を選択して、電力変化量ＤＰ_iを出力する。この電力変化量ＤＰ_iは、第３加算器９２で後述する補正量と加算され、さらに第４加算器９３で電力制御信号Ｐ_iと加算されて、電力制御信号ＣＬＰ_iとして出力される。なお、電力変化量ＤＰ_iは、電力制御信号Ｐ_iと同様に各々最大送信電力を１とする規格値である。
【００６７】
ここで、この実施形態においては、上記した所定量Ｄよりも小さい微小変化量Ｅ（Ｄ＞Ｅ）により、電力変化量ＤＰ_iを補正するようにしている。これは、電力制御が安定した場合、すなわち電力増減信号ＴＰＣ_iが各々ｕｐ−ｄｏｗｎ、ｄｏｗｎ−ｕｐの順列で変化した場合、微小変化量Ｅを考慮しないと、図２１（ａ）に示すように、送信電力が目標電力に達しても±Ｄの誤差を持ち、チャネル数、拡散コード等の差異により生じる誤差を解消することはできないからである。そこで、チャネル毎の電力増減信号ＴＰＣ_iが各々ｕｐ−ｄｏｗｎ、ｄｏｗｎ−ｕｐの順列で検知された場合は、Ｄ−Ｅを各チャネルの電力変化量ＤＰ_iとする。このことにより、図２１（ｂ）に示すように、電力制御が安定した後、電力変化量ＤＰ_iがＤ−Ｅと小さくなるため、±Ｅの誤差まで目標電力に近づけることが可能となる。
【００６８】
このため、図２０に示すクローズド・ループ制御回路９０においては、電力増減信号ＴＰＣ_iと、遅延器９４で遅延させた先の電力増減信号ＴＰＣ_iとから、パターン検出器９５において、電力増減信号ＴＰＣ_iが各々ｕｐ−ｄｏｗｎ、ｄｏｗｎ−ｕｐの順列で変化したか否かを検出する。その変化が検出されない場合は、第２選択器９６で補正なしを選択する。また、変化が検出された場合は、そのときの電力増減信号ＴＰＣ_iがｕｐで第１選択器９１で所定量Ｄが選択されるときは、第２選択器９６で−Ｅが選択され、電力増減信号ＴＰＣ_iがｄｏｗｎで第１選択器９１で所定量−Ｄが選択されるときは、第２選択器９６でＥが選択される。この第２選択器９６の出力と電力変化量ＤＰ_iを第３選択器で加算することにより、電力制御が安定していないときは、電力変化量ＤＰ_iが出力され、電力制御が安定しているときには、±（Ｄ−Ｅ）が出力される。その結果、図２１（ｂ）に示すように、±Ｅの誤差まで目標電力に近づけることが可能となる。
【００６９】
上記したように、この実施形態によれば、チャネル毎に電力制御信号Ｐ_iに電力変化量ＤＰ_iを加算して、チャネル毎の電力制御信号ＣＬＰ_iを求め、さらに最終的な総電力を、Ｅを最小単位とする精度で制御することができる。このようにすれば、移動機が移動することで生じる“見かけ上の”電力変化にリアルタイムに対応して、外部からの電力増減信号ＴＰＣ₁〜ＴＰＣ_Nにより、所望の電力へ自動的にかつ精度良く移行させることができる。
（通信装置のさらに他の実施形態）
図１、図１９に示す電力制御係数決定部８０において、Ｎチャネルでかつ全てのチャネルの伝送レートが同一場合には、各チャネルの「電圧の乗数」を１／Ｎとする。
【００７０】
このようにすることで、１つのデータを複数回線に分けて伝送する場合のように、同一種類かつ同一伝送レートで多重送信する時の回路構成をより簡易化することができる。
【図面の簡単な説明】
【図１】本発明の一実施形態にかかる通信装置のブロック構成を示す図である。
【図２】３チャネルのデータ信号Ｓ₁、Ｓ₂、Ｓ₃に対して「電圧の乗数」信号ＥＫ₁、ＥＫ₂、ＥＫ₃を求める場合の作動説明に供する説明図である。
【図３】電力制御係数決定部８０の第１の具体例を示す図である。
【図４】電力制御係数決定部８０の第２の具体例を示す図である。
【図５】図４中の第１ＲＯＭ８３、第２ＲＯＭ８４における第１、第２テーブルの構成を示す図である。
【図６】電力制御係数決定部８０の第３の具体例を示す図である。
【図７】図６中の第３ＲＯＭ８７、第４ＲＯＭ８８における第３、第４テーブルの構成を示す図である。
【図８】第１電力制御部２０₁〜２０_Nの具体的な構成を示す図である。
【図９】第２電力制御部６０の具体的な構成を示す図である。
【図１０】図９中の増幅係数演算回路６３の第１の変形例を示す図である。
【図１１】図９中の第５ＲＯＭ６３１内の第５テーブルの構成を示す図である。
【図１２】増幅係数演算回路６３を第２電力制御部６０から独立して設けた例を示す図である。
【図１３】図６に示す電力制御係数決定部８０中の第４ＲＯＭ８８により、増幅係数ＰＫを直接求めるようにした場合の第４ＲＯＭ８８内のテーブルの構成を示す図である。
【図１４】図９中の増幅係数演算回路６３の第２の変形例を示す図である。
【図１５】図１４中の第６ＲＯＭ６３２内の第５テーブルの構成を示す図である。
【図１６】図９中の増幅係数演算回路６３の第３の変形例を示す図である。
【図１７】図９中の増幅係数演算回路６３の第４の変形例を示す図である。
【図１８】図６中の第７ＲＯＭ６３７、第８ＲＯＭ６３８における第７、第８テーブルの構成を示す図である。
【図１９】本発明の他の実施形態にかかる通信装置のブロック構成を示す図である。
【図２０】図１９中のクローズド・ループ制御回路９０の具体的な構成を示す図である。
【図２１】送信電力が安定した場合における送信電力の変化パターンを示す図である。
【符号の説明】
１０₁〜１０_N…変調処理部、２０₁〜２０_N…第１電力制御部、
３０…加算部、４０…直交変調部、５０…ミキサ部、
６０…第２電力制御部、７０…増幅部、８０…電力制御係数決定部、
９０…クローズド・ループ制御回路。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a mobile station side communication apparatus using a CDMA (Code Division Mu1tipIe Access) system.
[0002]
[Background Art and Problems to be Solved by the Invention]
Conventionally, in a communication system using the CDMA system, a base station performs spreading using a spreading code assigned to each user, and then modulates and multiplexes the signals into radio signals in the same frequency band. At this time, transmission power control is performed in order to average the reception level at each mobile station having a different distance from the base station and reduce channel interference.
[0003]
In a communication system using a conventional CDMA system, a mobile station transmits one channel of transmission data to a base station. However, it is conceivable to perform multiplex transmission from a mobile station using a plurality of channels, for example, to transmit data such as telephone, facsimile, and video from the mobile station.
[0004]
In this case, in a communication device using the CDMA method, the frequency separation (FDNA: Frequency Division Mu1tip Ie Accesss) method is used, or the time separation (TDMA: Time Division Multip1e Access) method is used. In addition, since each channel is separated by a code, if there is a large variation in received power at the input stage of the base station, the identification by the code may be hindered. For this reason, it is necessary to strictly control the transmission power of each channel in the mobile station.
[0005]
Conventionally, a base station that controls transmission power for each channel has been proposed (see Japanese Patent Laid-Open No. 10-322270). However, this is power control in a base station, and discloses a technique different from power control in a case where a mobile station performs multiplex transmission with a plurality of channels.
[0006]
The present invention has been made in view of the above problems, and an object of the present invention is to provide a communication apparatus capable of appropriately performing power control when a mobile station performs multiplex transmission using a plurality of channels.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, claim 1 is provided. 2, 3, 5 In the invention described in the above, the data signal (S ₁ ~ S _N ) For each channel baseband processing means (10 ₁ -10 _N ) And first power control means (20 for controlling the power of data for each channel subjected to baseband processing) ₁ ~ 20 _N ), Addition means (30) for adding power-controlled data for each channel, orthogonal modulation means (40) for orthogonally modulating the added data, and mixer for mixing the orthogonally modulated data and the carrier signal Means (50), second power control means (60) for controlling the power of the signal output from the mixer means (50), and a power control signal for each channel (P ₁ ~ P _N ), The first control signal is output to the first power control means so that the sum of the amplitude voltages of the data for each channel subjected to baseband processing is constant, and the output of the second power control means is the power. Control signal generating means (80) for outputting the second control signal to the second power control means so as to match the control signal, and the first and second power control means are output from the control signal generating means. The power control is performed based on the first and second control signals.
[0008]
Thus, since the sum of the amplitude voltages of the data for each channel subjected to the baseband processing by the power control by the first power control means is made constant, the amplitude voltage of the signal input to the quadrature modulation means becomes constant, The orthogonal modulation means can be simplified without complicating it. Further, transmission can be performed with power matched with the power control signal by the power control by the second power unit.
[0009]
The control signal generating means is a claim. 1, 2, 13 1st generation means (81, 83, 87) for generating the first control signal based on the power control signal for each channel, the power control signal for each channel and the number of channels (N) And second generation means (82, 84, 88) for generating the second control signal based on the above.
[0010]
In this case, the claim 1, 14 As in the invention described in (1), the first generation means includes a first table look-up circuit (83) that generates a first control signal using a power control signal for each channel as an address, If the generating means is configured by the second table look-up circuit (84) that generates the second control signal by using the power control signal for each channel and the number of channels as an address, the first and second circuits using the arithmetic unit are used. Each process can be performed at high speed and easily compared with the case where the generation unit is configured.
[0011]
Claims 2, 15 As described in the invention, the first addition means (85) for adding the power control signal for each channel is provided, and the first generation means includes the value added by the first addition means and each of the power control signals. And a third table look-up circuit (87) for generating a first control signal using the address as the address, and the second generation means using the power control signal for each channel and the number of channels as the address as the second control signal. A fourth table look-up circuit (88) to be generated may be used.
[0012]
Further, the first power control means is a claim. 3 As in the invention described in (2), the same number of multipliers (21 ₁ ~ 21 _N ).
[0013]
Further, the second power control means described above is claimed. 4, 5 As in the invention described in (1), it can be configured to have amplification means (61) for amplifying a signal output from the mixer means based on the amplification coefficient. Amplification factor is claimed 6 As described in the invention described above, it can be obtained from the amplification coefficient generation means (63) that generates the amplification coefficient based on the second control signal. 7 If the fifth table look-up circuit (631) for outputting the amplification coefficient using the second control signal as an address is provided as in the invention described in (5), the amplification coefficient can be easily obtained.
[0014]
Further, the above amplification factor is defined in the claim. 8 It can also be obtained directly from the second generating means, as in the invention described in.
[0015]
Also, the amplification factor is claimed. 9 As described in the invention described above, if the initial gain is obtained by adding the change in the gain to the change in the second control signal, the gain can be obtained by adding / subtracting the change to the initial value. The size can be reduced as necessary, compared with the case of a table look-up circuit.
[0016]
Claims 10 The sixth table look-up circuit (632) for generating an offset value corresponding to the number of channels is provided, and the amplification coefficient is corrected by this offset value and output. In this case, it is possible to reduce the decrease in average power when the channels are multiplexed.
[0017]
And claims 11 And / or a seventh table look-up circuit (637) for generating an offset value in accordance with the spreading code of the channel. 12 As in the invention described in (5), an eighth table look-up circuit (638) that generates an offset value according to the transmission rate of the channel may be used to correct the amplification factor. This is effective in reducing the decrease in average power when multiplexed.
[0018]
Claims 16 As in the invention described in, the power control signal for each channel is changed to the power increase / decrease signal (TPC) for each channel. ₁ ~ TPC _N ) Power control signal (CLP) for each channel increased or decreased by ₁ ~ CLP _N ), And the first and second control signals are generated based on the power control signal from the control circuit. The transmission power can be controlled to a desired value in response to a change in power in real time.
[0019]
In this case, the claim 17 If the detection means (95) for detecting that the power control is stabilized based on the power increase / decrease signal and the means (92, 96) for finely adjusting the increase / decrease amount at the time of detection are provided The power after the power control is stabilized can be brought close to the target power within a very small range.
[0022]
In addition, the code | symbol in the bracket | parenthesis of each said means shows the correspondence with the specific means as described in embodiment mentioned later.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows a configuration of a communication unit according to an embodiment of the present invention, specifically, a transmission part of a mobile station in a communication system using a CDMA system.
[0024]
This communication device uses a multi-channel data signal S ₁ ~ S _N (N is a natural number) and a power control signal P that defines the transmission power of each channel ₁ ~ P _N (Standard value in which each maximum transmission power is 1) is input, and an RF band data signal is output. Data signal S ₁ ~ S _N Indicates transmission data when a mobile station performs multiplex transmission over a plurality of channels, such as telephone, facsimile, and video. Further, the power control signal P ₁ ~ P _N Indicates a signal for controlling the power in each channel in accordance with a command from the base station.
[0025]
The communication apparatus includes a modulation processing unit 10 for each channel. ₁ -10 _N And the first power control unit 20 ₁ ~ 20 _N An adder 30, a quadrature modulator 40, a mixer 50, a second power controller 60, an amplifier 70, and a power control coefficient determination unit 80.
[0026]
Data signal S for each channel ₁ ~ S _N The modulation processing unit 10 ₁ -10 _N The first power control unit 20 ₁ ~ 20 _N Are added to a single signal by the adder 30, and each process is performed by the quadrature modulator 40, the mixer 50, the second power controller 60, and the amplifier 70 to transmit the RF band. Output as data.
[0027]
Modulation processor 10 ₁ -10 _N Then, baseband processing is performed. For example, an error correction code such as spreading processing using a spreading code or convolution is added. The orthogonal modulation unit 40 performs modulation processing in accordance with a modulation method such as QAM (Quadrature Amplitude Modulation). The mixer unit 50 mixes the signal that has been quadrature modulated by the quadrature modulation unit 40 with a carrier signal having a carrier frequency. The amplification unit 70 performs final amplification in order to radiate a signal from the antenna.
[0028]
Also, the power control signal P for each channel ₁ ~ P _N And the channel number N are input to the power control coefficient determination unit 80, where the “voltage multiplier” signal EK of each channel ₁ ~ EK _N (First control signal) and "multiplier of all channel voltages" signal EA (second control signal) are generated. "Voltage multiplier" signal EK ₁ ~ EK _N The first power control unit 20 ₁ ~ 20 _N The “multiplier of all channel voltages” signal EA is input to the second power control unit 60.
[0029]
"Voltage multiplier" signal EK as described above ₁ ~ EK _N Is obtained by Equation 1.
[0030]
[Expression 1]

[0031]
"Voltage multiplier" signal EK ₁ ~ EK _N Is the data signal S of each channel ₁ ~ S _N Is used to make the sum of the amplitude voltages of the channels after the modulation processing, that is, the output amplitude voltage to the quadrature modulation unit 40 constant. Hereinafter, a three-channel data signal S in this regard ₁ , S ₂ , S _Three Will be described with reference to FIG.
[0032]
In FIG. 2, the power control signal P is applied to the 3-channel data signal. ₁ , P ₂ , P _Three (When the maximum power is set to 1, that is, when normalized to 1, the values are respectively shown as 0.9, 0.7, and 0.6 in the figure). The power control coefficient determination unit 80 receives the power control signal P ₁ , P ₂ , P _Three Is converted into a voltage ratio (when the power ratio is 0.9: 0.7: 0.6, the voltage ratio is, for example, 0.9: 0.8: 0.7). Since the sum x of each converted voltage is 2.4, the ratio value EK of each voltage ₁ , EK ₂ , EK _Three Are 0.9 / 2.4, 0.8 / 2.4, and 0.7 / 2.4.
[0033]
And the 1st electric power control part 20 ₁ ~ 20 _N The data signal S ₁ , S ₂ , S _Three And "Voltage multiplier" EK ₁ , EK ₂ , EK _Three When the addition unit 30 obtains the sum, the addition result, that is, the amplitude voltage input to the quadrature modulation unit 40 becomes constant. That is, it is normalized.
[0034]
Therefore, as understood from the above description, the first power control unit 20 ₁ ~ 20 _N The power control signal P ₁ ~ P _N Power ratio per channel P defined by _l : P ₂ ...: P _N The amplitude voltage of each channel is changed so that is the amplitude voltage ratio, and the sum of the amplitude voltages of each channel after modulation processing, that is, the output amplitude voltage to the quadrature modulator is made constant.
[0035]
Further, if the amplitude voltage of each channel is changed as described above, the transmission power is reduced, so it is necessary to restore the power of each channel. Here, if the transmission power when transmitting N channels simultaneously is N times the transmission power of only one channel, the power control signal P ₁ ~ P _N The transmission power should be increased by the sum of the power control signal P ₁ ~ P _N Is the “multiplier of all channel voltages” signal EA.
[0036]
However, when the transmission power when N channels are transmitted simultaneously does not increase N times, the “multiplier of all channel voltages” signal EA is obtained from Equation 2.
[0037]
[Expression 2]

[0038]
Where α _(N) Indicates the maximum transmission power that varies depending on the number of channels N (value when the transmission power is 1 when there is only one channel). For example, in the case of 3 channels in FIG. ₍₃₎ = 3.4, the “multiplier of all channel voltages” signal EA is 3.4 × 2.4 / 3. In Equation 2, if the transmission power when transmitting N channels simultaneously is N times, α _(N) = N and the power control signal P ₁ ~ P _N The sum of
[0039]
The second power control unit 60 amplifies the data signal for each channel, which is the output of the mixer unit 50, by the “multiplier of all channel voltages” signal EA. As a result, the power control signal P ₁ ~ P _N The data of each channel is transmitted with the power corresponding to.
[0040]
According to the above-described embodiment, the first power control unit 20 ₁ ~ 20 _N Since the second power control unit 60 and the power control coefficient determination unit 80 are provided, power control can be performed in two stages independently for each channel.
[0041]
Further, since the total amplitude voltage of the multiplexed data signal that is the input before quadrature modulation is constant, the input at the time of quadrature modulation does not need to cover a wide range of amplitude voltages, and can be reduced in size and cost.
[0042]
Hereinafter, a specific configuration of each unit illustrated in FIG. 1 will be described.
(About power control coefficient determination unit 80)
[First Specific Example of Power Control Coefficient Determination Unit 80]
FIG. 3 shows a first specific example of the power control coefficient determination unit 80. In this example, the power control coefficient determination unit 80 includes a first arithmetic circuit 81 and a second arithmetic circuit 82. The first arithmetic circuit 81 receives the power control signal P ₁ ~ P _N To the “voltage multiplier” signal EK using Equation 1 above. ₁ ~ EK _N Ask for. In addition, the second arithmetic circuit 82 receives the power control signal P ₁ ~ P _N Then, the “multiplier of all channel voltages” signal EA is obtained from the number N of channels and the above-described equation 2. The first arithmetic circuit 81 and the second arithmetic circuit 82 are configured using an arithmetic unit such as an adder.
[0043]
[Second Specific Example of Power Control Coefficient Determination Unit 80]
FIG. 4 shows a second specific example of the power control coefficient determination unit 80. In this example, the power control coefficient determination unit 80 is a table look-up circuit including a first ROM 83 and a second ROM 84.
[0044]
The first ROM 83 stores the power control signal P ₁ ~ P _N As the address and "Voltage multiplier" EK for each channel ₁ ~ EK _N Is stored as a table value. FIG. 5A shows the configuration of the first table in the first ROM 83. In addition, the second ROM 84 stores the power control signal P ₁ ~ P _N And the concatenation of the number of channels N is used as an address, and the “multiplier of all channel voltages” EA is stored as a table value. FIG. 5B shows the configuration of the second table in the second ROM 84.
[0045]
Power control signal P ₁ ~ P _N Refer to the first table by "Voltage multiplier" EK ₁ ~ EK _N , And the power control signal P ₁ ~ P _N The “multiplier of all channel voltages” EA is obtained by referring to the second table based on the number of channels N. Since the table look-up circuit can be used in this way and data can be extracted only by addressing, the processing can be performed at a higher speed and the configuration can be simplified as compared with the first specific example.
[0046]
[Third Specific Example of Power Control Coefficient Determination Unit 80]
FIG. 6 shows a third specific example of the power control coefficient determination unit 80. In this example, the power control coefficient determination unit 80 is a table look-up circuit including a first adder 85, a selector 86, a third ROM 87, and a fourth ROM 88.
[0047]
The first adder 85 receives the power control signal P ₁ ~ P _N Calculate and output the total sum AP. The selector 86 selects the power control signal P for each channel. _i (I represents an arbitrary number of 1 to N) are sequentially selected. The third ROM 87 stores the power control signal P ₁ ~ P _N Total power AP and power control signal P _i The connection is a “voltage multiplier” EK for each channel. ₁ ~ EK _N Is stored as a table value. FIG. 7A shows a third table that is internal data of the third ROM 87. The fourth ROM 88 stores the power control signal P ₁ ~ P _N The concatenation of the sum total AP of the above and the number of channels N is used as an address, and the “multiplier of all channel voltages” EA is stored as a table value. FIG. 7B shows a fourth table that is internal data of the fourth ROM 88.
[0048]
According to the third specific example, the two tables can be downsized as compared with the second specific example. In particular, with respect to the third ROM 87, as shown in FIG. 7A, the “voltage multiplier” EK of all channels. ₁ ~ EK _N Can be easily obtained by referring to one third table, and the effect of miniaturization increases as the number of channels increases.
(First power control unit 20 ₁ ~ 20 _N about)
FIG. 8 shows the first power control unit 20. ₁ ~ 20 _N The concrete structure of is shown. First power control unit 20 ₁ ~ 20 _N Is the same number of multipliers 21 as the number of channels N. ₁ ~ 21 _N It is composed of Multiplier 21 for each channel _i Is the data signal S _i And "Voltage multiplier" EK _i Is input, and the result of multiplying each is output.
(About the second power control unit 60)
FIG. 9 shows a specific configuration of the second power control unit 60. The second power control unit 60 is provided with a set of circuits including an amplifier (op-amp) 61, a DA (Digital-Analog) converter 62, and an amplification coefficient calculation circuit 63.
[0049]
The amplification factor calculation circuit 63 is a calculator that calculates the amplification factor PK from the “multiplier of all channel voltages” EA, and is a function that is experimentally obtained so that the output power from the amplification unit 70 matches the power control signal. Calculate according to The amplification coefficient PK output from the amplification coefficient calculation circuit 63 is converted into an analog signal by the DA converter 62 and input to the inverting input terminal of the amplifier 61. The data signal S that is the output of the mixer unit 50 is input to the non-inverting input terminal of the amplifier 61. The amplifier 61 outputs power-controlled signal data at an amplification factor corresponding to the value of the amplification coefficient PK.
[0050]
As the amplification coefficient calculation circuit 63 described above, various modifications shown below can be adopted.
[0051]
[First Modification of Amplification Coefficient Operation Circuit 63]
FIG. 10 shows a first modification of the amplification coefficient calculation circuit 63. In this example, the amplification coefficient calculation circuit 63 is a table look-up circuit composed of the fifth ROM 631, and previously stores the amplification coefficient PK with the “multiplier of all channel voltages” EA as a pointer as a table element. The amplification coefficient PK is determined with reference to this. FIG. 11 shows the configuration of the fifth table in the fifth ROM 631.
[0052]
When the amplification coefficient arithmetic circuit 63 is configured by an arithmetic unit as shown in FIG. 9, if the function obtained experimentally cannot be easily circuitized due to nonlinearity or the like, the circuit scale becomes large. By using a table look-up circuit as shown in FIG. In addition, the circuit scale can be reduced.
[0053]
The amplification coefficient calculation circuit 63 may be provided independently of the second power control unit 60 as shown in FIG. In the power control coefficient determination unit 80 shown in FIG. 6, the table shown in FIG. 13 may be provided in the fourth ROM 88, and the amplification coefficient PK may be directly obtained instead of the “multiplier of all channel voltages” EA. If the amplification coefficient PK is directly obtained in this way, the circuit can be reduced in size.
[0054]
[Second Modification of Amplification Coefficient Operation Circuit 63]
FIG. 14 shows a second modification of the amplification coefficient calculation circuit 63. In this example, a sixth ROM 632 and a third arithmetic circuit 633 are provided in addition to the fifth ROM 631 shown in FIG. The sixth ROM 632 stores an offset value for each channel when the number of channels is two or more as a sixth table (see FIG. 15).
[0055]
In this example, the third arithmetic circuit 633 amplifies the value extracted from the fifth ROM 631 by the “multiplier of all channel voltages” EA and the offset value extracted from the sixth ROM 632 by the number of channels (for example, addition). The coefficient PK is obtained. In other words, the amplification coefficient extracted from the fifth ROM 631 by the “multiplier of all channel voltages” EA is corrected by the above-described offset value, and the amplification coefficient PK is output.
[0056]
When each channel is multiplexed, a portion that mutually emphasizes and a portion that cancels each other are generated. In particular, at the parts that cancel each other, the desired amplitude cannot be maintained, and the average power is below the desired value. Therefore, as shown in this example, by adding an offset according to multiple channels, it is possible to increase the average power and enable transfer with a desired transmission power.
[0057]
[Third Modification of Amplification Coefficient Operation Circuit 63]
FIG. 16 shows a third modification of the amplification coefficient calculation circuit 63. In this example, a first subtractor 634, a second multiplier 635, and a second adder 636 are provided instead of the sixth ROM 632 and the third arithmetic circuit 633 in the second modification. In addition, the amplification coefficient calculation circuit 63 transmits one “multiplier of all channel voltages” EA when only one channel is transmitted. ₀ Is the initial value PK ₀ Hold as.
[0058]
The first subtractor 634 generates a single “multiplier of all channel voltages” EA. ₀ And the current (current) “multiplier of all channel voltages” EA, and subtracts to calculate and output a change amount EA of EA. The second multiplier 635 multiplies ΔEA by ΔP and outputs an amount of change when the “multiplier of all channel voltages” EA changes by the minimum control width as ΔP. The second adder 636 then calculates the offset value extracted from the sixth table according to the number of channels and the initial value PK of the amplification coefficient. ₀ And the output signal (ΔEA × ΔP) of the second multiplier is added to output an amplification coefficient PK.
[0059]
That is, in this example, the initial amplification coefficient PK ₀ Amplification coefficient is generated by adding the amount of change (ΔEA × ΔP) of the amplification coefficient to the change in EA, and the amplification coefficient is corrected by the offset value extracted from the sixth table, and the amplification coefficient PK is output. Is configured to do.
[0060]
When the event to be obtained can be linearly approximated, as shown in this example, the initial value is given, the change is obtained, and the desired value is obtained by adding to or subtracting from the initial value. Can be made smaller.
[0061]
[Fourth Modification of Amplification Coefficient Operation Circuit 63]
FIG. 17 shows a fourth modification of the amplification coefficient calculation circuit 63. In this example, in addition to the fifth ROM 631 and the sixth ROM 632 in the second modification, a seventh ROM 637 and an eighth ROM 638 are provided, and are amplified by the difference in the number of channels, the combination of channel spreading codes, and the channel transmission rate. The coefficient PK is changed.
[0062]
The seventh ROM 637 stores an offset value for each combination of channel spreading codes as a seventh table (see FIG. 18A). The eighth ROM 638 stores an offset value for each combination of channel transmission rates as an eighth table (FIG. 18B).
[0063]
In this example, the value extracted from the fifth ROM 631 by the “multiplier of all channel voltages” EA, the offset value extracted from the sixth ROM 632 by the number of channels, the value extracted from the seventh ROM 637 by the combination of the spreading codes, and the transmission rate The value extracted from the eighth ROM 638 by combination is calculated (for example, added) by the fourth calculation circuit 639 to obtain the amplification coefficient PK. Since the transmission rate, the number of channels, and the spreading code affect the transmission power, the transmission power can be controlled with higher accuracy by adding these corrections.
[0064]
In this example, the one using both the offset value of the channel spreading code and the channel transmission rate is shown. However, only one of them may be used, and the fifth ROM 631 may be replaced with the fifth ROM 631 shown in FIG. 1 subtractor 634, second multiplier 635, and initial value PK ₀ You may employ | adopt the structure using.
(Other embodiment of communication apparatus)
FIG. 19 shows a block configuration of a communication apparatus according to another embodiment of the present invention. The communication apparatus according to this embodiment is different from the embodiment shown in FIG. ₁ ~ P _N Is the power increase / decrease signal TPC for each channel from the outside ₁ ~ TPC _N The difference is that it is controlled by. For this reason, in this embodiment, a closed loop control circuit 90 is provided. The closed-loop control circuit 90 includes a power increase / decrease signal TPC. ₁ ~ TPC _N And power control signal P ₁ ~ P _N To the power control signal CLP for each channel after closed-loop control. ₁ ~ CLP _N Ask for.
[0065]
FIG. 20 shows a specific configuration of the closed loop control circuit 90. The closed loop control circuit 90 includes a circuit including a first selector 91, a third adder 92, a fourth adder 93, a delay unit 94, a pattern detector 95, and a second selector 96. N sets are provided for each channel.
[0066]
The first selector 91 is a power increase / decrease signal TPC. _i When the value is up, a predetermined amount D is selected. _i Is output. This power change DP _i Is added to a correction amount, which will be described later, by a third adder 92, and further, a power control signal P _i And the power control signal CLP _i Is output as Power change DP _i Is the power control signal P _i Similarly to the standard values, the maximum transmission power is 1.
[0067]
Here, in this embodiment, the power change amount DP is obtained by the minute change amount E (D> E) smaller than the predetermined amount D described above. _i I am trying to correct. This is because when the power control is stable, that is, the power increase / decrease signal TPC. _i When the values change in a permutation of up-down and down-up, if the minute change amount E is not taken into account, as shown in FIG. This is because errors caused by differences in the number of channels, spreading codes, etc. cannot be eliminated. Therefore, the power increase / decrease signal TPC for each channel _i Are detected in a permutation of up-down and down-up, respectively, D-E is the power change amount DP of each channel. _i And As a result, as shown in FIG. 21B, after the power control is stabilized, the power change amount DP _i Is smaller than D−E, and thus it is possible to approach the target power up to an error of ± E.
[0068]
Therefore, in the closed loop control circuit 90 shown in FIG. _i And the previous power increase / decrease signal TPC delayed by the delay unit 94 _i In the pattern detector 95, the power increase / decrease signal TPC _i Are detected in the permutation of up-down and down-up, respectively. If the change is not detected, the second selector 96 selects no correction. If a change is detected, the power increase / decrease signal TPC at that time is detected. _i When the predetermined amount D is selected by the first selector 91 when -up is selected, -E is selected by the second selector 96 and the power increase / decrease signal TPC is selected. _i Is down and the first selector 91 selects the predetermined amount −D, the second selector 96 selects E. The output of the second selector 96 and the power change amount DP _i When the power control is not stable, the power change amount DP is added. _i Is output and ± (DE) is output when the power control is stable. As a result, as shown in FIG. 21B, it becomes possible to approach the target power up to an error of ± E.
[0069]
As described above, according to this embodiment, the power control signal P for each channel. _i Power change amount DP _i And the power control signal CLP for each channel _i Further, the final total power can be controlled with accuracy with E as a minimum unit. In this way, a power increase / decrease signal TPC from the outside is provided in real time in response to an “apparent” power change caused by the movement of the mobile device. ₁ ~ TPC _N Thus, it is possible to automatically and accurately shift to the desired power.
(Still another embodiment of communication device)
In the power control coefficient determination unit 80 shown in FIGS. 1 and 19, when the transmission rate of all channels is the same for N channels, the “voltage multiplier” of each channel is set to 1 / N.
[0070]
By doing in this way, the circuit structure at the time of carrying out multiple transmission at the same kind and the same transmission rate like the case where one data is divided and transmitted on several lines can be simplified more.
[Brief description of the drawings]
FIG. 1 is a diagram showing a block configuration of a communication apparatus according to an embodiment of the present invention.
FIG. 2 shows a three-channel data signal S ₁ , S ₂ , S _Three For "voltage multiplier" signal EK ₁ , EK ₂ , EK _Three It is explanatory drawing with which it uses for operation | movement description when calculating | requiring.
3 is a diagram showing a first specific example of a power control coefficient determination unit 80. FIG.
4 is a diagram illustrating a second specific example of the power control coefficient determination unit 80. FIG.
FIG. 5 is a diagram showing a configuration of first and second tables in the first ROM 83 and the second ROM 84 in FIG. 4;
6 is a diagram illustrating a third specific example of the power control coefficient determination unit 80. FIG.
7 is a diagram showing a configuration of third and fourth tables in the third ROM 87 and the fourth ROM 88 in FIG. 6. FIG.
FIG. 8 shows a first power control unit 20 ₁ ~ 20 _N It is a figure which shows the specific structure of these.
9 is a diagram showing a specific configuration of a second power control unit 60. FIG.
FIG. 10 is a diagram showing a first modification of the amplification coefficient calculation circuit 63 in FIG. 9;
11 is a diagram showing a configuration of a fifth table in the fifth ROM 631 in FIG. 9; FIG.
12 is a diagram illustrating an example in which an amplification coefficient calculation circuit 63 is provided independently of the second power control unit 60. FIG.
13 is a diagram showing a configuration of a table in the fourth ROM 88 when the amplification coefficient PK is directly obtained by the fourth ROM 88 in the power control coefficient determination unit 80 shown in FIG. 6;
FIG. 14 is a diagram showing a second modification of the amplification coefficient calculation circuit 63 in FIG. 9;
15 is a diagram showing a configuration of a fifth table in the sixth ROM 632 in FIG. 14;
FIG. 16 is a diagram showing a third modification of the amplification coefficient calculation circuit 63 in FIG. 9;
FIG. 17 is a diagram illustrating a fourth modification of the amplification coefficient calculation circuit 63 in FIG. 9;
18 is a diagram showing a configuration of seventh and eighth tables in the seventh ROM 637 and the eighth ROM 638 in FIG. 6. FIG.
FIG. 19 is a diagram showing a block configuration of a communication apparatus according to another embodiment of the present invention.
20 is a diagram showing a specific configuration of a closed loop control circuit 90 in FIG.
FIG. 21 is a diagram illustrating a transmission power change pattern when transmission power is stable;
[Explanation of symbols]
10 ₁ -10 _N ... Modulation processing unit, 20 ₁ ~ 20 _N ... 1st electric power control part,
30 ... Adder, 40 ... Quadrature modulator, 50 ... Mixer,
60 ... second power control unit, 70 ... amplification unit, 80 ... power control coefficient determination unit,
90: Closed loop control circuit.

Claims (17)

Baseband processing means (10 ₁ to 10 _N ) for baseband processing a plurality of channels of data signals (S _{1 to} S _N ) for each channel;
First power control means for controlling the power of the data of the baseband processed per channel and (20 ₁ ~20 _N),
Adding means (30) for adding data for each power-controlled channel;
Orthogonal modulation means (40) for orthogonally modulating the added data;
Mixer means (50) for mixing the quadrature modulated data and the carrier signal;
Second power control means (60) for controlling the power of the signal output from the mixer means (50);
Based on the power control signals (P _{1 to} P _N ) for each channel, the first control signal is sent to the first power control means so that the sum of the amplitude voltages of the data for each channel subjected to the baseband processing becomes constant. Control signal generation means (80) for outputting a second control signal to the second power control means so that the output of the second power control means matches the power control signal,
The first and second power control means are communication apparatuses on a mobile station side using a CDMA system that performs respective power control based on first and second control signals output from the control signal generation means. ,
The control signal generation means includes first generation means (81, 83, 87) for generating the first control signal based on the power control signal for each channel, the power control signal for each channel, and the number of channels ( N) and second generation means (82, 84, 88) for generating the second control signal based on
The first generation unit includes a first table look-up circuit (83) that generates the first control signal using the power control signal for each channel as an address, and the second generation unit includes: A communication apparatus comprising a second table look-up circuit (84) for generating the second control signal by using the power control signal for each channel and the number of channels as an address. Baseband processing means (10 ₁ to 10 _N ) for baseband processing a plurality of channels of data signals (S _{1 to} S _N ) for each channel;
First power control means for controlling the power of the data of the baseband processed per channel and (20 ₁ ~20 _N),
Adding means (30) for adding data for each power-controlled channel;
Orthogonal modulation means (40) for orthogonally modulating the added data;
Mixer means (50) for mixing the quadrature modulated data and the carrier signal;
Second power control means (60) for controlling the power of the signal output from the mixer means (50);
Based on the power control signals (P _{1 to} P _N ) for each channel, the first control signal is sent to the first power control means so that the sum of the amplitude voltages of the data for each channel subjected to the baseband processing becomes constant. Control signal generation means (80) for outputting a second control signal to the second power control means so that the output of the second power control means matches the power control signal,
The first and second power control means are communication apparatuses on a mobile station side using a CDMA system that performs respective power control based on first and second control signals output from the control signal generation means. ,
The control signal generation means includes first generation means (81, 83, 87) for generating the first control signal based on the power control signal for each channel, the power control signal for each channel, and the number of channels ( N) and second generation means (82, 84, 88) for generating the second control signal based on
The control signal generation means includes first addition means (85) for adding the power control signal for each channel, and the first generation means includes the value added by the first addition means and the power control. A third table look-up circuit (87) for generating the first control signal by using each signal as an address, and the second generation means includes a power control signal for each channel and the number of channels. A communication device comprising a fourth table look-up circuit (88) for generating the second control signal as an address. Baseband processing means (10 ₁ to 10 _N ) for baseband processing a plurality of channels of data signals (S _{1 to} S _N ) for each channel;
First power control means for controlling the power of the data of the baseband processed per channel and (20 ₁ ~20 _N),
Adding means (30) for adding data for each power-controlled channel;
Orthogonal modulation means (40) for orthogonally modulating the added data;
Mixer means (50) for mixing the quadrature modulated data and the carrier signal;
Second power control means (60) for controlling the power of the signal output from the mixer means (50);
Based on the power control signals (P _{1 to} P _N ) for each channel, the first control signal is sent to the first power control means so that the sum of the amplitude voltages of the data for each channel subjected to the baseband processing becomes constant. Control signal generation means (80) for outputting a second control signal to the second power control means so that the output of the second power control means matches the power control signal,
The first and second power control means are communication apparatuses on a mobile station side using a CDMA system that performs respective power control based on first and second control signals output from the control signal generation means. ,
The first power control means comprises a number of multipliers (21 _{1 to} 21 _N ) equal to the number of channels. The communication apparatus according to claim 3 , wherein the second power control means includes amplification means (61) for amplifying a signal output from the mixer means based on an amplification coefficient. Baseband processing means (10 ₁ to 10 _N ) for baseband processing a plurality of channels of data signals (S _{1 to} S _N ) for each channel;
First power control means for controlling the power of the data of the baseband processed per channel and (20 ₁ ~20 _N),
Adding means (30) for adding data for each power-controlled channel;
Orthogonal modulation means (40) for orthogonally modulating the added data;
Mixer means (50) for mixing the quadrature modulated data and the carrier signal;
Second power control means (60) for controlling the power of the signal output from the mixer means (50);
Based on the power control signals (P _{1 to} P _N ) for each channel, the first control signal is sent to the first power control means so that the sum of the amplitude voltages of the data for each channel subjected to the baseband processing becomes constant. Control signal generation means (80) for outputting a second control signal to the second power control means so that the output of the second power control means matches the power control signal,
The first and second power control means are communication apparatuses on a mobile station side using a CDMA system that performs respective power control based on first and second control signals output from the control signal generation means. ,
The communication apparatus according to claim 1, wherein the second power control means includes amplification means (61) for amplifying the signal output from the mixer means based on an amplification coefficient. The communication apparatus according to claim 4 or 5 , further comprising amplification coefficient generation means (63) for generating an amplification coefficient based on the second control signal. The communication apparatus according to claim 6 , wherein the amplification coefficient generating means includes a fifth table look-up circuit (631) that outputs an amplification coefficient using the second control signal as an address. . The said 2nd production | generation means is comprised so that the said amplification coefficient may be output as a said 2nd control signal based on the power control signal for every said channel and the said number of channels, The Claim 4 or 5 characterized by the above-mentioned. The communication device described. The amplification factor generating means to claim 6, characterized in that it comprises means for generating said amplification coefficient by adding the change amount of the amplification factor for the change of the second control signal to the initial amplification factor (634 and 635) The communication device described. The amplification coefficient generation means has a sixth table look-up circuit (632) for generating an offset value corresponding to the number of channels, and the amplification coefficient is corrected and output by this offset value. the communication apparatus according to claim 7 or 9, characterized in that it is configured. The amplification coefficient generating means has a seventh table look-up circuit (637) for generating an offset value corresponding to the spreading code of the channel, and the amplification coefficient is corrected by this offset value and output. The communication device according to claim 7 , wherein the communication device is configured as described above. The amplification coefficient generating means has an eighth table look-up circuit (638) for generating an offset value corresponding to the transmission rate of the channel, and the amplification coefficient is corrected by this offset value and output. The communication device according to claim 7 , wherein the communication device is configured as described above. The control signal generation means includes first generation means (81, 83, 87) for generating the first control signal based on the power control signal for each channel, the power control signal for each channel, and the number of channels ( The communication device according to any one of claims 3 to 12, further comprising second generation means (82, 84, 88) for generating the second control signal based on N). The first generation unit includes a first table look-up circuit (83) that generates the first control signal using the power control signal for each channel as an address, and the second generation unit includes: 14. The method according to claim 13 , comprising a second table look-up circuit (84) for generating the second control signal by using the power control signal for each channel and the number of channels as an address. Communication device. The control signal generation means includes first addition means (85) for adding the power control signal for each channel, and the first generation means includes the value added by the first addition means and the power control. A third table look-up circuit (87) for generating the first control signal by using each signal as an address, and the second generation means includes a power control signal for each channel and the number of channels. 14. The communication device according to claim 13 , comprising a fourth table look-up circuit (88) for generating the second control signal as an address. A control circuit (90) for generating a power control signal (CLP _{1 to} CLP _N ) for each channel obtained by increasing or decreasing the power control signal for each channel by a power increase / decrease signal (TPC _{1 to} TPC _N ) for each channel; said control signal generating means (80), the first based on the power control signal from the control circuit, according to any one of claims 1 to 15 and generates a second control signal Communication equipment. The control circuit includes detection means (95) for detecting that the power control is stabilized based on the power increase / decrease signal, and means (92, 96) for finely adjusting the increase / decrease amount at the time of detection. The communication device according to claim 16 .

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