JP2010057196A - ランダムアクセスチャネルのプリアンブルに関連づけた符号を発生する方法 - Google Patents
ランダムアクセスチャネルのプリアンブルに関連づけた符号を発生する方法 Download PDFInfo
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- 238000000034 method Methods 0.000 title claims description 32
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- 230000002596 correlated effect Effects 0.000 description 4
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M7/00—Conversion of a code where information is represented by a given sequence or number of digits to a code where the same, similar or subset of information is represented by a different sequence or number of digits
- H03M7/30—Compression; Expansion; Suppression of unnecessary data, e.g. redundancy reduction
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- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
- H04B7/2628—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using code-division multiple access [CDMA] or spread spectrum multiple access [SSMA]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
- H04B1/7073—Synchronisation aspects
- H04B1/7075—Synchronisation aspects with code phase acquisition
- H04B1/7077—Multi-step acquisition, e.g. multi-dwell, coarse-fine or validation
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- H04J—MULTIPLEX COMMUNICATION
- H04J13/00—Code division multiplex systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
- H04B1/709—Correlator structure
- H04B1/7093—Matched filter type
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J13/00—Code division multiplex systems
- H04J13/10—Code generation
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- Synchronisation In Digital Transmission Systems (AREA)
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
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Abstract
【解決手段】整合フィルタからのエネルギー出力を用いて受信ディジタルシグネチャを検出する検出器を提供する。変動し得る伝送距離について予期されるシグネチャパターンにしたがってそれらエネルギー値を表にする。この表は往復伝搬遅延の予想値を算入したものであり、累算ずみのシンボルの処理は、採用シグネチャ符号化がコヒーレント型か非コヒーレント型かに関わりなく、また複数ドップラーチャネルの有無に関わりなく、正しいシグネチャの抽出を可能にする。
【選択図】図5
Description
Δt=2(距離)/C (式1)
で与えられる。ここでC=3.0×108 m/sである。
Sold(i,1)=−Aの場合;i対応の全jに−1を乗算。 (式2)
例えば、図2に示したシグネチャ4(i=4)については、
Sold(i,j)=Snew(i,j−1)の場合;Snew(i,j)=A (式3)
Sold(i,j)≠Snew(i,j−1)の場合;Snew(i,j)=−A (式4)
で表される。この例をさらに続けると、シグネチャ4(i=4)については
Sold(4,2)≠Snew(4,2−1),−A≠A
したがって、
Snew(4,2)=−A
となる。
z(ik)=x(ik)+jy(i,k),
ただしi=0から255、k=0から18 (式5)
で与えられる。各出力の実部および虚部の2乗の和で表されるエネルギー瞬時値は次式、すなわち
p(i,k)=z(i,k)z(i,k)*=x2+y2 (式6)
で与えられ、マトリクス101に蓄積される。
和(k)=0,k=0,1,2,3
k=0乃至3につき次式を計算、すなわち
和(k)=和(k)+P(i,n+k−1)
次のk.
次に、
最大の和(k)についてkを選択する
maxk=0
max=和(0)
k=1乃至3について
和(k)>maxの場合
max=和(k)
maxk=k
次のk.
上述の被選択候補値をコヒーレントまたは非コヒーレントPSK符号化のための通常の相関検出プロセスの出力と比較する。通常の相関検出プロセスはこの明細書による説明の範囲外であり、当業者には周知である。
S(i,k)=シグネチャiのk番目の要素;
M(i,k)=ここに提案する新たな被伝送シグネチャ組のk番目の要素;
R(i,k)=ここに提案する新たなコピー組のk番目の要素,受信機蓄積用
次に、これら要素を次のとおりマップする。すなわち、A・・・>1およびB・・・>j=sqrt(−1)にマップし、M(i,0)=A=1およびR(i,0)=A=1にセットする。k=1乃至15について次式を得る、すなわち、
M(i,k)=M(i,k−1)×S(i,k) (式11)
R(i,k)=S*(i,k) (式12)
ここで、*は複素共役値を表す。
S(i,k)=jの場合、R(i,k)=−j
この規則は図14に示すとおり総括でき、この図において左欄はM(i,k)の四つのとり得る値を表し、第1行はS(i,k)の四つのとり得る値を表す。図15は未符号化の原系列および差動符号化による変換後の系列を示す。
次にプリアンブルシグネチャとの相関をとり、Sum(i)=0が得られる。i=0乃至15について、次式すなわち
Sum(i)=Sum(i)+D(i,k)×R(i,k) (式14)
が得られる。新たな被送信シグネチャ全体を図16に示す。AをBに置換しBをAに置換することによって上述の手法と同じ手法を図13に示されるプリアンブルシグネチャに適用できる。
27 送信機
29 受信機
31 シグナルプロセッサ
33 入力データ
35 前向き誤り訂正符号器
41a,41b QPSKシンボルストリーム
43a,43b 複素擬似雑音系列
45a,45b ディジタルスペクトラム拡散信号
46a,46b,57a,57b ミキサ
53 コンバイナ
59a,59b 中間周波数信号
61 フィルタ
62a,62b ミキサ
67 シグナルプロセッサ
79 整合フィルタ
81 プリアンブル相関器
85 ピーク検出器
87 タイミング推算器
89 RAKEユニット
101 ランダムアクセスチャネル(RACH)検出器
103 遅延手段
106 実部選択器
107 複素共役値プロセッサ
200 プリアンブルシグネチャ仮検出手順
201 マトリクスにデータを格納する
202 各行内のエネルギーの和を算出して蓄積する
204 第1行についての和を所定の閾値と比較する
206 和は閾値よりも大きい?
208 仮検出と印をつける
210 各行についての和を比較ずみ?
212 次の行についての和に進む
214 距離アンビギュイティを解消する
216 候補を出力する
300 距離アンビギュイティを解消する手順
301 初めの16個の位置に進む(k=0)
302 それら16個の位置についてのエネルギー値の和を算出する
304 エネルギー値の和を蓄積する
306 全位置についての和を算出した?
(すなわち k=3 成立?)
308 次の16個の位置に進む
312 和を互いに比較して最大値を示す位置を判定する
314 和の最大値に対応するkの値を出力する
Claims (1)
- 符号分割多元接続(CDMA)加入者局ユニットであって、
受信機と、
16個のプリアンブルシグネチャから一つのプリアンブルシグネチャを選択するように構成された回路と、
前記選択されたプリアンブルシグネチャに基づいて符号を生成し、該符号を位相回転して処理されたプリアンブルシグネチャ信号を生成する回路であって、該処理されたプリアンブルシグネチャはCDMAランダムアクセスチャネル(RACH)信号を処理することに使用される、回路と、
前記RACH信号を送信するように構成された送信機と
を備えることを特徴とする符号分割多元接続(CDMA)加入者局ユニット。
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
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US11229998P | 1998-12-14 | 1998-12-14 | |
US11628499P | 1999-01-19 | 1999-01-19 | |
US12541899P | 1999-03-22 | 1999-03-22 | |
US12917799P | 1999-04-14 | 1999-04-14 |
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JP2006335581A Division JP4589911B2 (ja) | 1998-12-14 | 2006-12-13 | ランダムアクセスチャネルのプリアンブルに関連づけた符号を発生する方法 |
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JP2010057196A true JP2010057196A (ja) | 2010-03-11 |
JP4681665B2 JP4681665B2 (ja) | 2011-05-11 |
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JP2000588907A Expired - Fee Related JP4355107B2 (ja) | 1998-12-14 | 1999-12-14 | ランダムアクセスチャネルプリアンブルの検出 |
JP2004175917A Expired - Fee Related JP4589662B2 (ja) | 1998-12-14 | 2004-06-14 | ランダムアクセスチャネルのプリアンブルに関連づけた符号を発生する方法 |
JP2006335581A Expired - Fee Related JP4589911B2 (ja) | 1998-12-14 | 2006-12-13 | ランダムアクセスチャネルのプリアンブルに関連づけた符号を発生する方法 |
JP2009277866A Expired - Fee Related JP4681665B2 (ja) | 1998-12-14 | 2009-12-07 | ランダムアクセスチャネルのプリアンブルに関連づけた符号を発生する方法 |
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JP2000588907A Expired - Fee Related JP4355107B2 (ja) | 1998-12-14 | 1999-12-14 | ランダムアクセスチャネルプリアンブルの検出 |
JP2004175917A Expired - Fee Related JP4589662B2 (ja) | 1998-12-14 | 2004-06-14 | ランダムアクセスチャネルのプリアンブルに関連づけた符号を発生する方法 |
JP2006335581A Expired - Fee Related JP4589911B2 (ja) | 1998-12-14 | 2006-12-13 | ランダムアクセスチャネルのプリアンブルに関連づけた符号を発生する方法 |
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US (5) | US7529210B2 (ja) |
EP (3) | EP1142149B1 (ja) |
JP (4) | JP4355107B2 (ja) |
KR (1) | KR100661378B1 (ja) |
CN (3) | CN1129241C (ja) |
AT (2) | ATE262239T1 (ja) |
AU (1) | AU2708400A (ja) |
DE (3) | DE1311075T1 (ja) |
DK (1) | DK1142149T3 (ja) |
ES (3) | ES2219107T3 (ja) |
HK (4) | HK1041573B (ja) |
WO (1) | WO2000036761A2 (ja) |
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