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Rfid receiver

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||l||| |||||||| ll l|l||l III" "III III" III" III" "III III" III" "III "III |||||| |l|| |||| MI US 20100310019A1 (12) Patent Application Publication (10) Pub. No.: US 2010/0310019 A1 (19) United States (43) Pub. Date: Dec. 9, 2010 Sadr Publication Classi?cation (54) RFID RECEIVER (2006.01) R ' Sd L An 1 CA (51) Int.Cl, ($511" a r’ OS ge es’ H04L 27/00 (75) Inventor: w. W 4 3 3, 4 3 y 7 3 I, 4 3 y 7 3 G s U \74 6 P L L, Y E L M B & K C E -P ev, e ,mO dR AE eM C n0 @P mu, WT EU 0 cm ABSTRACT (57) 2875 MICHELLE DRIVE, SUITE 110 IRVINE, CA 92606 (US) RFID data signals from RFID tags may be recovered by (73) Assignee; Mojix, Inc,’ Los Angelesa CA (Us) determining the probabilities of transitions between data states between a series of a pairs of signal samples using a set of predetermined probabilities related to data, timing, baud (21) Appl. No.: 12/603,027 rate and/ or phase variables affecting the received signal and processing those determined probabilities to determine the sequence of such transitions that has the highest probability of occurrence. A second set of predetermined probabilities related to transitions in the opposite direction may be used to (22) Filed: Oct. 21, 2009 Related US. Application Data (63) Continuation of application No. 11/ 553,951, ?led on sequence in a reverse direction. The determination of the sequence representing the RFID tag data may be iterated in Oct. 27, 2006, noW Pat. No. 7,633,377. (60) Provisional application No. 60/731,629, ?led on Oct. both directions until further iterations do not change the deter mined probabilities. 28, 2005. lnterrogator / Reader 1-1 3 Forward Channel R urn Channel 148 Receiver System 1-12
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||l||| |||||||| ll l|l||l III" "III III" III" III" "III III" III" "III "III |||||| |l|| |||| MI US 20100310019A1

(12) Patent Application Publication (10) Pub. No.: US 2010/0310019 A1 (19) United States

(43) Pub. Date: Dec. 9, 2010 Sadr

Publication Classi?cation (54) RFID RECEIVER

(2006.01) R ' Sd L An 1 CA (51) Int.Cl, ($511" a r’ OS ge es’ H04L 27/00

(75) Inventor:

w. W 4 3 3, 4 3 y 7 3 I, 4 3 y 7 3 G s U \74 6 P L L, Y E L M B & K C E -P ev, e ,mO dR AE eM C n0 @P mu, WT EU 0 cm

ABSTRACT (57) 2875 MICHELLE DRIVE, SUITE 110 IRVINE, CA 92606 (US)

RFID data signals from RFID tags may be recovered by (73) Assignee; Mojix, Inc,’ Los Angelesa CA (Us) determining the probabilities of transitions between data

states between a series of a pairs of signal samples using a set of predetermined probabilities related to data, timing, baud (21) Appl. No.: 12/603,027 rate and/ or phase variables affecting the received signal and processing those determined probabilities to determine the sequence of such transitions that has the highest probability of occurrence. A second set of predetermined probabilities related to transitions in the opposite direction may be used to

(22) Filed: Oct. 21, 2009

Related US. Application Data

(63) Continuation of application No. 11/ 553,951, ?led on sequence in a reverse direction. The determination of the sequence representing the RFID tag data may be iterated in

Oct. 27, 2006, noW Pat. No. 7,633,377.

(60) Provisional application No. 60/731,629, ?led on Oct. both directions until further iterations do not change the deter mined probabilities. 28, 2005.

lnterrogator / Reader

1-1 3

Forward Channel

R urn Channel

148

Receiver System 1-12

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Patent Application Publication Dec. 9, 2010 Sheet 1 0f 29 US 2010/0310019 A1

Forward Channel -1

Sensor

Re urn Channel

1-18

Fig. 1

_ 5? mm H ........ i“ W

mm r W 1.6. m m

r “V, i H mm W8 W4 m $.03 WHO n1 M 081 “.mal. a M re. “8. w H HR1. “E1. W 1/ mm M .m “S W

“n w

“a n .r. M

“T

> m

H U H m y m

H 1 7_ u

_ /., _ _

W Y _ m m

H .w H

m a qvu, m H .W S 2 M

_ All _

H e .W 1 n

m R e u

0 C M

H e m

M R M

u 4.. u

M a r. m

_ e .

m .m S Ll M H D U M

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Patent Application Publication Dec. 9, 2010 Sheet 2 0f 29 US 2010/0310019 A1

l

Forward Channel Data _ Transmitter > 2.15. i

‘ Source ' 2_4 i g I E _ S i

2 Physical Model _2_-_1_ ens“ ; ; 2.2.8. :

l Data l g User ‘*m Receiver ‘m Return Channel §

g 2.12 2-11 2-10 i

Fig. 2a

Data 220 Theoretical Model § Source w ——-—-——2'3O '

5 _ /lnput Sequence a ; ' 2-34 : 2 2-16 2.11.. g i v A 2-18 = g Outer Single Modulation ; § Code : lnterleavel’ _" Parity ’ Encoder § § Code §

5 A 2-2 _2-26 ejr?l : ac . . E

I Receiver "“M <--~® “w Channel §

2-24 % ' Output 222 5 ; Sequence c — 3

3 2-32 1

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Patent Application Publication Dec. 9, 2010 Sheet 3 0f 29 US 2010/0310019 A1

§_-_4_

w S|5O P k(C; Decoder

Pk(a;l) Q Pk(a;O) @ 2>_-_@

Figure 3.

5kg Aim/c) /?\’l(ak) @ $2 5 ftlVl t‘ De‘ w» 0 errc

‘ Calcuiation‘ “— lmerleaver

5.:19. ; SISO

S'SO fizfl .- Decoder

phasejgming = lnterleaver‘ 4-2 and Channel —-—

Estimation / 2Q (Gk) A2 (ak)

Fig.4

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Patent Application Publication Dec. 9, 2010 Sheet 4 0f 29 US 2010/0310019 A1

Quantized Phase Space

Figure 5.

Quantized Time Domain

T T A v

Figure 6.

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Patent Application Publication Dec. 9, 2010 Sheet 5 0f 29 US 2010/0310019 A1

Exampie of Trellis Diagram

Figure 7.

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Patent Application Publication Dec. 9, 2010 Sheet 6 0f 29 US 2010/0310019 A1

V

mjk 05k I maxwi +mik,0zj +n/zjk )

Forward state backward state metric metric

a e )6 .

<§§g Fig. 8.b

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Patent Application Publication Dec. 9, 2010 Sheet 8 0f 29 US 2010/0310019 A1

Qm 6E Yam \mhoumq QMG. EESEQ ma: 6 Q:

amém was EEEEQ RME RMR

mwém 3%; @EE \EEQQ 3%. Si .55 NEE ém ém

$88 gm 85$ mu

S“ MR NE E

cmwm 60%

mTQm bq b

5% ~58

Page 10: Rfid receiver

Patent Application Publication Dec. 9, 2010 Sheet 9 0f 29 US 2010/0310019 A1

Repetition L SISO Decoder

mzi1z,l in)”; min,L 9C-10

96-12 mT 4

Inomgi m0uf,2 mow/LL 9C4 6

L

m : m . I? i

T 9c-18

mm’k I mT —mm,k k :1,2...,L

Figure 9c

SPC SISO Decoder With q input one outpur

Infill mini ill/Li}?> (1+1 0

ii

iii 96-12

Figure 9d

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Patent Application Publication Dec. 9, 2010 Sheet 12 0f 29 US 2010/0310019 A1

Received Received Signal 1 Signal

Branch Metric 1 -8 Branch Metric 1 2-2 Generator Generator ‘I + ‘1 1 Coherent Non-Coherent

SISO Decoder S180 Decoder 12-6

1 2-14 m

12_-4 SISO Output

Cascaded Non 124 8 Coherent and _ Coherent SISO

R I S t eceiver yS em

Ha?“ Coherent 1.2.22.2. L‘m'ter SISO Decoder

1 Bit Stream (to User)

Coherent SISO Receiver Subsystem

12-10

Fig. 12.a

12-12

1 2-30

1 2-4 Hard Limiter

1, Bit Stream (to User) Figure 12.19

Figure 12.

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Patent Application Publication Dec. 9, 2010 Sheet 13 0f 29 US 2010/0310019 A1

System 1 3-10

\ Ceiiing Multipath

13-4 Multipath 13-4

Palette of cases with Items 13-7 having RFID Tags M Reader 7

lnterrogator 13-1

I’rems 13-7

Fig. 13a

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Patent Application Publication Dec. 9, 2010 Sheet 14 0f 29 US 2010/0310019 A1

Reader/ Interrogator

.1 I I I | I I I I | I I I I I I

.I

vm-Q I

\/

EEEEE I

Modulation Sing/e Panty Code

m1

Data Source System 13-12

Onter/eaver 13-48

86 f 00 m Ma v mma Dcw? OCH .1 IIIIIIIIIIIII IIL

Y Receiver 13-28

7

F...

C53 lower ecvwi ewmka, R n

nkmm?lI. mwwmw s = cmmc w

my. nm

r6 MHZ ma I main M910 BIN/ob

am ww IIII 8

n F I I I I I I I II uMmw w /

Tami wsw II] [8 M w 5MB

m :I

u

r r

w W f 6

e V

m m1 5%1 ‘M1 m .In. m

F. I I I I I I I I I I I I I I

FIG. 13!?

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Patent Application Publication Dec. 9, 2010 Sheet 15 0f 29 US 2010/0310019 A1

User Data 14-22

dk XOR x 1 ~» 1 FMO Encoder Output 14 1s 2“ 14-10 Data _-' 14-16 '_ 14-24

Fig. 14a

1442 Miller Encoder 14-32 14-60

14-46 14-50 14-56 X

0 Mapping User ‘ ' ° “’ '1

_ 1 —+ 1 _ Data M \(c 1i 14-28 :>~ g ;

14-52 19-132 14 34 14-58 M ; Mapping

E 4 L 1 “’ 1 Output X Data 2k 14-48

14-33

Fig 14.10

Page 17: Rfid receiver

Patent Application Publication Dec. 9, 2010 Sheet 16 0f 29 US 2010/0310019 A1

Integrate

any?” Ns/Z L38 15-45 1548 w Mapping g,‘

r» f ~>~ 1+] --p--k Channel 15 44 Data r . ~

15-2; 2k 60”] Data (detected) 15-40 (C0nventi0na/~

n0~c0herent RX FIG. 15a )

Integrate 15 52

an???) ‘Vs/2 15 54 r 1k 15 60 M? 15-66 - f Re” Na in A

K >5 pp 5' 4k —- 2: —- E 5 *' $111+

Channel Q Data y I‘ _LZ 15-30 15.53 Data (detected)

(Conventiona/ 1 coherent RX)

Integrate 15_76 15 70 and Dump IVs/2 15.74 m

—15“78 15-72 K >5 rlk M . A , E = ulhp/e Symbol dk

Ch I ‘L ‘ g’ > Non-Coherent —---> ame rZk Detector

Data y 15-80

FIG. 15C

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Patent Application Publication Dec. 9, 2010 Sheet 17 0f 29 US 2010/0310019 A1

FMO Encode:

FIVIO Multi-Symbol Non-Coherent Detectlon

dk -----+

For N=3:

(diva)

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Patent Application Publication Dec. 9, 2010 Sheet 18 0f 29 US 2010/0310019 A1

Miller Code Trellis FMO Trellis

Figure 16

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Patent Application Publication Dec. 9, 2010 Sheet 19 0f 29 US 2010/0310019 Al

@a sum

NN & w w w M Q

_ _ _

lnmmmmmwmmm mmm?mmmmmmn . nun“ I 11:17: 11711111: EEEESEQEQ . -11.?2

N _

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HHHHHHHWHHHHHH_HHH|MIHHVAMWI ‘ . l I l l l l l I I I I I l ll.

HHHHHHHHHHHHHH_HHHHHHHHI. Egg bemssa D 1 mg $6-32 EHSEQ O 1 i i ..

Emqmguéme Em E838 cmmémm EMEQEG 855%?‘

839

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