Source: http://www.google.com/patents/US7065146?dq=552685
Timestamp: 2015-08-05 07:39:37
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Matched Legal Cases: ['Application No. 60', 'art 16', 'art 11', 'art 16', 'art 11', 'art 11']

Patent US7065146 - Method and apparatus for equalization and decoding in a wireless ... - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsJoint equalization and decoding techniques to eliminate the division operations in the Frequency domain Equalizer (FEQ) of an Orthogonal Frequency Division Modulation (OFDM) receiver by incorporating the magnitude of the channel impulse response estimates into the decision metrics in the decoder. This...http://www.google.com/patents/US7065146?utm_source=gb-gplus-sharePatent US7065146 - Method and apparatus for equalization and decoding in a wireless communications system including plural receiver antennaeAdvanced Patent SearchPublication numberUS7065146 B1Publication typeGrantApplication numberUS 10/259,024Publication dateJun 20, 2006Filing dateSep 26, 2002Priority dateFeb 15, 2002Fee statusPaidAlso published asUS7388924, US7646821Publication number10259024, 259024, US 7065146 B1, US 7065146B1, US-B1-7065146, US7065146 B1, US7065146B1InventorsHui-Ling Lou, Kok-Wui CheongOriginal AssigneeMarvell International Ltd.Export CitationBiBTeX, EndNote, RefManPatent Citations (12), Non-Patent Citations (13), Referenced by (49), Classifications (16), Legal Events (4) External Links: USPTO, USPTO Assignment, EspacenetMethod and apparatus for equalization and decoding in a wireless communications system including plural receiver antennae
wherein said branch metric computation unit computes the plurality of branch metrics using BMk,n,t=−2{overscore (X)}k,n,i CSI�X+(Ĥk,n�X)2 per dimension.
BM k,n,i=−2Z k,n,i �X+Ĥ k,n 4 �X 2.
BM k,n,t=−(|Z k,n,t |−Ĥ k,n 2 �m)�sign(b t).
BM k,n,t=(−|Z k,n,t |+{hacek over (H)} k,n 2 �m)�sign(b i)
wherein said branch metric computation unit computes the plurality of branch metrics using BMk,n,t=−2Xk,n,i CSI�Ĥk,n�X+(Ĥk,n�X)2 per dimension.
BM k,n,t=−(|Z k,n,t |−H k,n 2 �m)�sign(b i).
BM k,n,t=−(|Z k,n,t |+{hacek over (H)} k,n 2 �m)�sign(b i).
wherein said computing means includes means for computing the plurality of branch metrics using BMk,n,t=−2{overscore (X)}k,n,t CSI�Ĥk,n�X+(Ĥk,n�X)2 per dimension.
BM k,n,i=−2Z k,n,i �X+{hacek over (H)} k,n 4 �X 2.
BM k,n,t =−(| Z k,n,t|−Ĥk,n 2 �m)�sign (b i).
BM k,n,t=−(|Z k,n,t |−Ĥ k,n 2 �m)�sign(b i).
BM k,n,t=(−|Z k,n,t |+{hacek over (H)} k,n 2 �m)sign(b i)
wherein said computing step includes computing the plurality of branch metrics using BMk,n,t=−2{overscore (X)}k,n,t CSI�{overscore (H)}k,n�X+(Ĥk,n�X)2 per dimension.
BM k,n,t=(|Z k,n,t |−Ĥ k,n 2 �m)�sign(b 1)
BM k,n,t=(−|Z k,n,t|+{hacek over (H)}k,n 2 �m)sign(b 1)
wherein said computing step includes computing the plurality of branch metrics using BMk,n,t=−2{overscore (X)}k,n,t CSI�Ĥk,n�X+(Ĥk,n�X)2 per dimension.
This application claims priority benefit under 35 U.S.C. � 119(e)(1) to U.S. Provisional Application No. 60/357,317, filed on Feb. 15, 2002, entitled “ON DIVISION-FREE FREQUENCY DOMAIN EQUALIZATION AND VITERBI DECODING USING CHANNEL STATE INFORMATION”, which is incorporated herein fully by reference.
X _ k , n = Y k , n H _ k , n = H _ k , n * � Y k , n  H _ k , n  2 ( 1 ) where: 1) {overscore (X)}k,n is the demodulated symbol of the kth sub-carrier during the nth OFDM symbol; 2) Yk,n is the received noisy symbol of the kth subcarrier during the nth OFDM symbol; and 3) {overscore (H)}k,n is the channel estimate corresponding to the kth subcarrier during the nth OFDM symbol.
Z k,n =H* k,n �Y k,n, (2)
Z k,n =H* k,n �Y k,n =|H k,n|3 X k,n +H* k,n v k,n (8)
ℑ{Z k,n }≡Z k,n,1 =|H k,n|2 X k,n|2 X k,n,1 +H k,n,0 �v k,n,1 −H k,n,1 �v k,n,0. (10)
where iε{0,1}, and Xε{�1} for QPSK, Xε{�1, �3} for 16-QAM, and Xε{�1, �3, �5, �7} for 64-QAM constellations. Since the term (Zk,n,t 2) is common to all the branch metrics at each stage of the Viterbi decoding process, this term can be subtracted from all the path metrics without changing the MLSE (described below) comparison results. Thus,
BM k,n,t=−2Z k,n,t �|H k,n|2 �X+(|H k,n|2 �X)2 (12)
BM k,n,i =−Z k,n,i =−Z k,n,t �|H k,n|2 �X for QPSK. (13)
{ W k , n } ≡ W k , n , 0 =  H k , n  � X k , n , 0 + ( H k , n , 0 � v k , n , 0 + H k , n , 1 � v k , n , 1 )  H k , n  ( 14 ) ( 15 ) From which, the Viterbi decoder branch metrics, BMk,n,i, can be derived as follows:
BM k,n,i=(W k,n,i −|H k,n |�X)2 =W k,n,i 2−2 W k,n,i �|H k,n |�X+(|H k,n |�X)2, (16)
BM k,n,t=−2W k,n,t �|H k,n |�X+(|H k,n |�X)2 (with CSI), (17)
BM k,n,t =−W k,n,t �|H k,n |�X for QPSK (with CSI). (18)
BM k,n,t=−2Z k,n,t �X+(|H k,n |�X)2 (with CSI). (19)
BM k,n,t =−Z k,n,i �X for QPSK (with CSI). (20)
P k,n =e −Φk,n �Y k,n =|H k,n |�X k,n +e −jΦk,n �v k,n (21)
BM k,n,t=−2P k,n,t �|H k,n |�X+(|H k,n |�X)2 (with CSI), (22)
BM k,n,t =−P k,n,i |H k,n |�X for QPSK (with CSI). (23)
X _ k , n = V k , n H _ k , n = X k , n + v k , n H _ k , n , where Xk,n,tε{�1} for QPSK, Xk,n,tε{�1, �3} for 16-QAM, and Xk,n,tε{�1, �3, �15, �7} for 64-QAM constellations, and iε{0,1} represents the in-phase (I) and quadrature (Q) components of Xk,n. In this case, the hard-decision decoded symbol, Dec{{overscore (X)}k,n}, can be computed by rounding {overscore (X)}k,n,t to its corresponding nearest constellation point, Xk,n,t, in each dimension.
Z k,n =|{overscore (II)} k,n|2 �X k,n =|H k,n|2 �X k,n +H* k,n �v k,n, (28)
P k,n =|{overscore (H)} k,n |�{overscore (X)} k,n =|H k,n |�X k,n +e −jΦ k,n �v k,n, (29)
If ((|Zk,n,t|−2|{overscore (H)}k,n|2)≦0), Dec{{overscore (X)}k,n,t}=�1,
otherwise Dec{{overscore (X)}k,n,i}=�3.
if ((|Zk,n,t|−2|{overscore (H)}k,n|)2≦0), Dec{{overscore (X)}k,n,i}=�1, exit;
if ((|Zk,n,t|−3|{overscore (H)}k,n|)2≦0), Dec{{overscore (X)}k,n,t}=�3, exit;
if ((|Zk,n,t|−6|{overscore (H)}k,n|)2≦0), Dec{{overscore (X)}k,n,i}=�5, exit;
Dec{{overscore (X)}k,n,t}=�7.
if ((|Pk,n,t|−2|{overscore (H)}k,n|)≦0), Dec{{overscore (X)}k,n,t}=�1,
otherwise Dec{{overscore (X)}k,n,t}=�3.
if ((|Pk,n,i|−2|{overscore (H)}k,n|)≦0), Dec{{overscore (X)}k,n,t}=�1, exit;
if ((|Pk,n,t|−4|{overscore (H)}k,n|)≦0), Dec{{overscore (X)}k,n,t}=�3, exit;
if ((|Pk,n,t|−6|{overscore (H)}k,n|)≦0), Dec{{overscore (X)}k,n,t}=�5, exit;
Dec{{overscore (X)}k,n,t}=�7. exit;
BM k,n,t=−({overscore (X)} k,n,t −m)�sign(b 1), (31)
To improve the Viterbi decoder performance, CSI may be incorporated to normalize the expected noise power appropriately as described above in Section 1. If Wk,n is demodulated using From Equation 18, the piecewise branch metric should be (�Wk,n,t�|Hk,n|). That is, the slope of the branch metrics will be �|Hk,n|, depending on whether the sign of bi is −1 or 1. Furthermore, the piecewise decision regions are separated by m�|Hk,n| (see Equations 14 and 15), where m=0 for QPSK, mε{0,2} for 16-QAM and mε{0,2,4} for 64-QAM constellations. In short, the branch metrics will be of the form,
BM k,n,i =−|H k,n|2(|{overscore (X)} k,n |−m)�sign(b i)(with CSI), (34)
BM k,n,t=−(|Zk,n,t |−|H k,n|2 �m)�sign(b 1), (35)
BM k,n,t=−(|Hk,n|(|P k,n,t|−|Hk,n |�m)�sign(b 1), (36)
X _ k , n = ∑ d = 0 D - 1 H k , n ( d ) * Y k , n ( d ) ∑ d = 0 D - 1  H k , n ( d )  2 . ( 37 ) Substituting Y k,n (d) =H k,n (d) �X k,n +v k,n (d), Equation (37) may be rewritten as (38)
X _ k , n = X k , n + ∑ d = 0 D - 1 H k , n ( d ) * v k , n ( d ) ∑ d = 0 D - 1  H k , n ( d )  2 ( 39 ) This signal is demodulated, and the I and Q components, Re{{overscore (X)}k,n} and Im{{overscore (X)}�k,n} are sent to the Viterbi decoder 830.
BM k,n,t=−2{overscore (X)} k,n,t CSI �Ĥ k,n �X+(Ĥ k,n �X)2(MRC with CSI), (42)
where iε({0,1}, and Xε{�1} for QPSK, Xε{+1, �3} for 16-QAM, and Xε{+1, �3, �5, �7} for 64-QAM constellations. For QPSK, the relationship simplifies to
BM k,n,t =−{overscore (X)} k,n,t CSI �Ĥ k,n �X(MRC with CSI), (43)
Z k,n=Σd=0 D-1 H k,n ( d)*�Y k,n ( d) ((44)
BM k,n,t=−(|Z k,n,i |−Ĥ k,n 2 �m)�sign(b t) (47)
{tilde over (Y)} k,n (d)= g (d) �Y k,n (d) (48)
{tilde over (H)} k,n (d) =g (d) �H k,n (d) (49)
Z k,n=Σd=0 D-1(g (d))−2 {tilde over (H)} k,n (d)* �{tilde over (Y)} k,n ( d) (51)
BM k,n,t=(−|Z k,n,t |+{hacek over (H)} k,n 2 �m)sign(b i)(MRC with CSI) (52)
Z k,n ={tilde over (H)} k,n ( o)*�{tilde over (Y)} k,n (0) +β�{tilde over (H)} k,n (1)* �{tilde over (Y)} k,n (1) (54)
BM k,n,t=(−|Z k,n,t|+({tilde over (H)} k,n (0)2 +β�{tilde over (H)} k,n (1)2)�m)�sign(b i)(MRC with CSI) (55)
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H04L1/00B5LLegal EventsDateCodeEventDescriptionSep 26, 2002ASAssignmentOwner name: MARVELL SEMICONDUCTOR, INC., CALIFORNIAFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:LOU, HUI-LING;CHEONG, KOK-WUI;REEL/FRAME:013349/0220Effective date: 20020926Mar 27, 2007CCCertificate of correctionDec 21, 2009FPAYFee paymentYear of fee payment: 4Dec 20, 2013FPAYFee paymentYear of fee payment: 8RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services