JP2010512072A - 到着時間推定器の最適閾値選択の方法 - Google Patents
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
- G01S5/02—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using radio waves
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- G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
- G01S5/02—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using radio waves
- G01S5/08—Position of single direction-finder fixed by determining direction of a plurality of spaced sources of known location
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W64/00—Locating users or terminals or network equipment for network management purposes, e.g. mobility management
- H04W64/006—Locating users or terminals or network equipment for network management purposes, e.g. mobility management with additional information processing, e.g. for direction or speed determination
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Abstract
【選択図】 図15
Description
r(t)=s(t)+n(t) (1)
式中、信号s(t)は、以下のように減衰パルスと遅延パルスの和で表わされ、
式中、n(t)は、ゼロ平均値と両側電力スペクトル密度N0/2を有するAWGNであり、LはMPCの最大数であり、τ1=τは間隔[0,T)にわたって観測される受信信号r(t)に基づいて推定されるべきTOAであり、{τ2,τ3,…,τL;α1,α2,…,αL}はパス利得αlおよび遅延τlを含む局外パラメータの集合である。チャネルは、τl=τ+Δ(l−1)であるタップ付き遅延線としてモデル化され、式中、Δ≒Tpは解決可能なタイムスロットの幅であり、Δ(L−1)はチャネルのばらつきである。パス利得αlは、一般に、
で与えられ、式中、βlとφlはそれぞれパスの振幅と位相を表し、blは、pbと1ーpbの確率で値“1”(パスあり)と値“0”(パスなし)を取ることのできる確率変数である。
と書くことができ、式中、Φp(τ)はパルスp(t)の自己相関関数であり、z(t)はMF506の出力端子における色ガウス雑音であり、自己相関関数は、
で与えられる。MFベースの推定器ではts=Δであるため、Np=Lである(すなわち、マルチパス領域の各スロット内には1以下のパスが存在する)。
で与えられ、式中、vk (MF)=v(MF)(tk)である。
で与えられ、式中、yk (ED)およびTNR(“閾値対雑音比”)は、yk (ED)=vk (ED)/N0およびTNR=λ/N0で定義される。
式中、それぞれ、MFベースの推定器ではη=CRLBであり、EDベースの推定器では、η=ts 2/12である。次いで、ステップ1518で、これらのバイアスおよびMSEの値が評価されて、システムの設計者によって設定された最小バイアス値およびMSE値の範囲内に入るかどうか判定される。これらのバイアス値およびMSE値が最小値基準を満たす場合、閾値λは最適とみなされる。その場合、閾値選択が完了したとみなされる。そうでない場合、閾値選択プロセスはステップ1504に戻り、そこで異なる閾値λ’が割り当てられる。
Claims (1)
- 通信チャネルを介して伝搬される信号の到着時間(TOA)推定器の閾値を選択する方法であって、
(i)前記通信チャネルの条件を表すメトリックを決定するステップと、
(ii)前記メトリックに基づいて現在の閾値の初期値を選択するステップと、
(iii)前記通信チャネルにおける観測期間内の電力遅延プロファイルにおけるいくつかの候補イベントの識別に基づいて、前記観測期間をいくつかのタイムスロットに分割するステップと、
(iv)(a)各候補イベントごとに、当該の候補イベントにおいて評価される信号の信号検出関数が前記現在の閾値を超える確率、および(b)前記信号検出関数が前記候補イベントのうちの最初のイベントの前に前記現在の閾値を超える確率を算出するステップと、
(v)前記算出される確率に基づき、バイアス値および平均二乗誤差値を算出するステップと、
(vi)前記バイアス値および前記平均二乗誤差値が所定の基準セットを満たすかどうか判定するステップと、
(vii)前記所定の基準セットが満たされないときに、前記メトリックに従って前記現在の閾値を修正し、ステップ(iii)〜(vii)を繰り返すステップと、
(viii)前記現在の閾値を前記TOA推定器の前記閾値として選択するステップと、
を備える方法。
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US86852606P | 2006-12-04 | 2006-12-04 | |
US60/868,526 | 2006-12-04 | ||
US11/949,152 US20080130794A1 (en) | 2006-12-04 | 2007-12-03 | Method for optimum threshold selection of time-of-arrival estimators |
US11/949,152 | 2007-12-03 | ||
PCT/US2007/086392 WO2008070671A2 (en) | 2006-12-04 | 2007-12-04 | Method for optimum threshold selection of time-of-arrival estimators |
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JP (1) | JP5139443B2 (ja) |
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JP2021128077A (ja) * | 2020-02-14 | 2021-09-02 | 株式会社東海理化電機製作所 | 通信装置、情報処理方法、及びプログラム |
JP2021128080A (ja) * | 2020-02-14 | 2021-09-02 | 株式会社東海理化電機製作所 | 通信装置、情報処理方法、及びプログラム |
JP7366793B2 (ja) | 2020-02-14 | 2023-10-23 | 株式会社東海理化電機製作所 | 通信装置、情報処理方法、及びプログラム |
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EP2052470A4 (en) | 2010-05-05 |
WO2008070671A3 (en) | 2008-08-28 |
WO2008070671A2 (en) | 2008-06-12 |
JP5139443B2 (ja) | 2013-02-06 |
EP2052470A2 (en) | 2009-04-29 |
KR100975250B1 (ko) | 2010-08-11 |
US20080130794A1 (en) | 2008-06-05 |
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