MIMO 学习心得 --------Ellen wang
LTE 的 7 个传输模式 个传输模式中 中 6 个分别应用 个分别应用了四种 了四种 MIMO 技术方案传 技术方案传输分 输分!"T !"T#$% #$%&' &'() () "*+,-./0-123$%45用"M$%8用9 MIMO"M:;MIMO$ <= >?@ABC传输模式D >?@ABC传输模式D = T0,2F-1 T0,2F-1G#1H G#1H+0F1 +0F1G G 模式分 模式分 JKBC的 JKBC的 *%N *%N JKBC的 JKBC的 *PT *PT# # Q种方案D Q种方案D JKBC的 JKBC的 * * R * * S T*"U T*"U,V+ ,V+ T1-+ T1-+ *W/VX *W/VX /Y+$Z[ /Y+$Z[\]% \]%^ ^ O#M _个 FW/G 的`ab>cb% 的`ab>cb%defg defg^h用 ^h用 T*%ijklm T*%ijklmSn Sn o*p< 个qr&]分s的 个qr&]分s的%det %detn n 用uvQ个qr&]wxuvQ个yk`a% 用uvQ个qr&]w xuvQ个yk`a%z\{| z\{| *D \}h用 JKBCy%* JKBCy%*PT#" PT#"0+~•+2V 0+~•+2V €1GV+Y T0,2F-1G #1H+0F1G$‚ƒ用D #1H+0F1G$‚ƒ用D „= M;/U+2 W//U%:E W//U%:E ……†‡ˆ‰的 ……†‡ˆ‰的 oI"o,2X oI"o,2X I2Y1V,G/0$DeyŠ I2Y1V,G/0$DeyŠ‹Œh用 ‹Œh用 ##"VW+ ##"VW+ #+W, #1H+0F1G$技术D = M;VW/F+ M;VW/F+ W//U%:E W//U%:E Žˆ‰的‘ Žˆ‰的‘’†‡“ ’†‡“g的 g的 ”MI"”0+V/Y123 ”MI"”0+V/Y123 M,G01 I2Y1V,G/0$D–— I2Y1V,G/0$D–— ˜用™š›œž ˜用™š›œžŸ“g Ÿ“g的 的 ”MI ¡= M:;MIMO%¢方案£¤¥的yjlm@ M:;MIMO%¢方案£¤¥的yjlm@¦4分%分s§f¥的 ¦4分%分s§f¥的用9D 用9D 6= VW/F+ W//U 0,2X<¨¨M /0 *%:E †‡ˆ‰ˆ©h得 †‡ˆ‰ˆ©h得Š‹ª« Š‹ª«“g的 “g的 ”0+V/Y123D ”0+V/Y123D 7= :E U+V1,W o¨¨*%N o¨¨*%N *+,-/0-123 *+,-/0-123 的¬_种方式f¥ 的¬_种方式f¥%种方 %种方式®¯ 式®¯ :E †‡ˆ‰ˆ©%\ †‡ˆ‰ˆ©%\ SŠ‹@¦°±ˆ SŠ‹@¦°±ˆa²±方 a²±方³% ³%´µ¶± ´µ¶±ˆa中· ˆa中·¸ ¸ :E U+V1,W oDŠ‹tn¹ oDŠ‹tn¹ :E º» :E U+V1, U+V1,W W o ¼的 ¼的 ½ID ½ID 45用S>了¾¿传输bŽbœ% Š^8ÀÁ的¥y传输%Â8个¤ÃÄÅ的bŽÆ@¦ÇÈ Éf¥的Ê%Ëf¥的BCJK¼ÌDÀÁbœÍBCbœÎÏ_ÐD"}ÑBCbœ >ÒÀÁ bœ$D
传输分!ÓÔ用^¾¿ˆa传输的tÕÖ%×—ƒ用4yØÀ" STC$ÙÚÛÜy分!"CDD) ÝBCÞß分!à%LTE 中用的áâ8的S SFBC ØÀD 传输分!"TM2$用]¾¿ˆa传输的tÕÖ%ÓÔSãäåæçè用9% TM3%TM4 ÓÔS ãäåæ中é的用9%¾¿êëìíD MU-MIMO S>了¾¿îïœ%用^åæ中的ðñò!æD TM6%TM7 S用^óôåæõö%÷S用^çè用9Df¦ 6 Sãä FDD%7 Sãä TDD \øD µ学习ùú MIMO û¬%¯Ôùúü个Šýþÿ 1. coewo! o!" ¤}^ T!an#o!$Bloc%& Â物ùʯÔ传输的原始bŽ块. LTE t支持µ¥_块lm¥y 传输 2 个¤äÄÅ的 coewo!%S@¦45用" SM$技术实现的D 2. la'e!bŽ‚分>f¥ la'e! ²±传输%la'e! 总b(BC个bDNˆ‰ 矩阵的 !an% Sä应的D¤ }^4分的维度D 总的 la'e! bD 3. !an%¤}^ 4. a$enna nna #o!$其实´fà¥^BC个b%\S¤}^f¥的ˆ‰ 参考ˆa #a$$e!nDä端口 *+3%确实ä应8BCy%,S 的JK #a$$e!n；ä^端口 4%ä应^ MC%MBSF/ 情况的 ,S； ä^端口 0%ä应^ UE S#ecal ,SD TDD-LTE 中支持的传输模式h用的 DCI o!a$ Dµ每_种模式中都tn@¦ 改[ DCI o!a$ ÞßÉJ È分!模式" TM2$%´且 TM3ÙTM4 模式¶%÷ 支持µf改[ DCI o!a$ 的情况¶z4分用Þß ÉJÈ分!模式" TM2$%y¯Ô@¦µ DCI o!a$ 中的 #!econg no!a$on el ]指示所h用的 #!econg a$! 5ec$o! D
F!o 36.213 Tale 7.1-0 Table 7.1-5: PDCCH and PDSCH configured by C-RNTI
Mode 2
DCI format 1A DCI format 1
Mode %
DCI format 1A DCI format 2A
Mode
DCI format 1A DCI format 2
Mode "
Common and UE specific by C-RNTI UE specific by C-RNTI Common and UE specific by C-RNTI UE specific by C-RNTI
Common and UE specific by C-RNTI UE specific by C-RNTI
DCI format 1A
Common and UE specific by C-RNTI
DCI format 1
UE specific by C-RNTI
DSC #!oce low"
Transmit diversity (see sbc!ase "#1#2$ Transmit diversity (see sbc!ase "#1#2$ Transmit diversity (see sbc!ase "#1#2$ &ar'e de!ay CDD (see sbc!ase "#1#%$ or Transmit diversity (see sbc!ase "#1#2$ Transmit diversity (see sbc!ase "#1#2$ C!osed-!oop spatia! m!tip!e)in' (see sbc!ase "#1#$or Transmit diversity (see sbc!ase "#1#2$ If t*e nmber of +,C antenna ports is one. /in'!e-antenna port. port 0 is sed (see sbc!ase "#1#1$. ot*erise Transmit diversity (see sbc!ase "#1#2$ /in'!e-antenna port port 3 (see sbc!ase "#1#1$
La'e! a##ng /ow coewo!-$o-la'e! a##ng 8##o!$ 3 $'#e" 1. La'e! a##ng o! $!anon on a ngle an$enna #o!$ 1 coewo!-$o-1 la'e! 2. La'e! a##ng o! #a$al 8l$#leng 2 an$enna #o!$" 1) 1 coewo!-$o-1 la'e! 2) 2 coewo!-$o-2 la'e! 4 an$enna #o!$" 1) 1 coewo!-$o-1 la'e! 2) 1 coewo!-$o-2 la'e! 3) 2 coewo!-$o-2 la'e! 4) 2 coewo!-$o-3 la'e! 0) 2 coewo!-$o-4 la'e!
Table 6...!-1: Code"ord-#o-layer $a%%ing for &%a#ial $ul#i%le'ing. Nu$ber of layer&
Nu$ber of code"ord&
Code"ord-#o-layer $a%%ing la'e! *&1&...& M 7'36 1
i
1
la'e!
9 *)
la'e!
9 *)
M 7'6 M 7'6
x 9 * ) 9i ) d 9 * ) 9i )
1
x 9 *) 9i ) d 9* ) 9i ) 2
91)
x
2
91)
91)
9i) d
9 *)
9i ) d
91)
9i ) d
x
9 2)
9i ) d
x
9*)
9i) d
x x
2
x
x
9i ) d
9i )
x 9*) 9i) d 9*) 92i)
1
%
91)
M 7'6 M 7'6 M 7'6
2
91)
9 *)
92i
9* )
9i )
91)
92i)
91)
92i
9 *)
92i)
9 *)
92i
9i) d
M 7'3 M 7'3 2 la'e!
9*)
la'e!
9 *)
la'e!
9 *)
91)
M 7'6 M 7'6 M 7'6 2
91)
M 7'6 M 7'6 2 M 7'6
2
x
9 2)
x
93)
91)
92i)
91)
92i
9i ) d 9i ) d
3. La'e! a##ng o! $!an$ 5e!$' 1 coewo!-$o-2 la'e! 92 an$enna #o!$) 1 coewo!-$o-4 la'e! 94 an$enna #o!$) Table 6...-1: Code"ord-#o-layer $a%%ing for #ran&$i# di(er&i#y. Nu$ber of layer&
Nu$ber of code"ord&
Code"ord-#o-layer $a%%ing i
2
1
x
9 *)
x
91)
9i)
x
9*)
9i ) d
9i)
x 91) 9i )
1
d d
9*)
la'e! *&1&...& M 7'36 1
92i ) la'e!
9 *)
9*)
92i 1 M 7'6 M 7'6 2
9 *)
9 4i )
la'e! M 7'36 9 *) d 94i 1)
x
9 2)
9i ) d
x
9 3)
9i ) d
9 *) M 7'36 4 9 *) M 7'36 2 4
9*)
M 7'36 3 9*)
M 7'36 3
9*)
94i 2
9 *)
9 *) 94i 3 I M 7'6 o 4 * $wo n8ll 'ol :all
e a##ene $o d
Preconding /ow #!econg 8##o!$ 3 $'#e" 1. !econg o! $!anon on a ngle an$enna #o!$ 2. !econg o! $!an$ 5e!$'
9*)
9* )
9 M 7'6 1)
y 9 *) 9 2i ) 1 * j 91) * 1 * 1 9 2 ) y i y 9 *) 92i 1) * 2 * 1 91) y 92i 1) 1 * j
* ,e x 9*) 9i )
j ,e x 91) 9i ) j I3 x 9 *) 9i ) * I3 x 91) 9i )
3. !econg w$:o8$ CDD---- Cloe-loo# #a$al 8l$#leng c:ee9TM4) y 9*) 9i ) x 9 *) 9i) W 9i) 9 P 1 ) 9 1 ) y x 9i ) 9i ) 4. !econg o! la!ge ela' CDD ---- La!ge ela' CDD c:ee9TM3 ) y 9 *) 9i) x 9 *) 9i ) W 9i) D9i)U y 9 P 1) 9i ) x 9 1) 9i )
U an
D 9i )
can ge$ !o elow $ale acco!ng $o e!en$ la'e!
Table 6..).!.!-1: *arge-delay cyclic delay di(er&i#y. Nmber of !ayers
2
%
Fo!
W 9i )
U
1 1 2 1 1 1 1 3 1
D 9i )
1
e
1 e e
1 1 1 e j 2 1 2 1 e j 4 j 6 1 e
1 *
j 2 2
1
j 2 3 j 4 3
e e
j 4 j ;
1 * *
3 3
1 j 4 4
4
4
e
4
e j12
e
j ; 4
4
e e
j
j1
e j1
e
* j 4 i 3 e
* e
*
j 2 i 3
*
* 1 * e j 2 * * * *
*
j 2 i 2
* i 4
* e
j 4 i 4
can elec$e !o coeoo% ene n 36.211 Tale 6.3.4.2.3-1.
*
e j 6
Table 6..).!.-1: Codeboo+ for #ran&$i&&ion on an#enna %or#& Codeboo + inde'
Nu$ber of layer&
1
!
1 1
1 1
2 1
0
1 1
2 1
2
1 1 2 j
%
1 1 2 j
*
2 *
1 1
1
*&1 .
1
1
2 1
1
1 1
1
2 j
j
-
PMI UE wll !e#o!$ $:e 8gge$e coeoo% ne ' MI an e/B wll en $:e coeoo% no w:c: e/B wll 8e o! DSC ' DCI. Fo! e!en$ $!anon oe& $:e MI wll 8e e!en$ n8e! o $. Table 7.!-1b: Nu$ber of bi#& in codeboo+ &ub&e# re&#ric#ion bi#$a% for a%%licable #ran&$i&&ion $ode&. Nu$ber of bi#& Ac ! an#enna %or#&
) an#enna %or#&
Tran&$i&&ion $ode
2
Tran&$i&&ion $ode )
4
4
Tran&$i&&ion $ode 5
14
Tran&$i&&ion $ode 6
14
4
%2
Tran&$i&&ion $ode ,
T!anon oe 3" MI wll 8e 2 $--- a
*
a1
Fo! 2 an$enna #o!$" a1 ean
2 la'e! ----coeoo% ne * --------
1 1
2 *
*
1
a*
ean 1 la'e! ----- coeoo% ne * -------ean $!an$ 5e!$'
T!anon oe 4" MI wll 8e 6 $--- a
*
a1 a2 a3 a 4 a0
Fo! 2 an$enna #o!$& ene n 36.211 Tale 7.2-1c" a*
1 1
ean 1 la'e! ----coeoo% ne *-----
a1 ean
2 1 1 1
1 la'e! ----coeoo% ne 1-----
1 1 2 j
a2
ean 1 la'e! ----coeoo% ne 2------
a3
ean 1 la'e! ----coeoo% ne 3-------
a4
ean 2 la'e! ----coeoo% ne 1------
a0
ean 2 la'e! ----coeoo% ne 2------
Table 7.!-1c: &&ocia#ion of bi#& in
2 1
1 1 2 j 1 1
1
2 1
1
1 1
1
2 j
j
codebookSubSetRestriction bi#$a%
#o %recoder& in #e ! an#enna %or#
codeboo+ of Table 6..).!.-1 in /0. Codeboo+
Nu$ber of layer&
inde' ic 1
!
0
a0
-
1
a1
a4
2
a2
a5
%
a%
-
!econg no n DCI e/B wll en $:e #!econg no n DCI o!a$ 2<2=.
T!anon oe 3"
DCI o!a$ 2=" !econg no!a$on n8e! o $ a #ece n Tale 0.3.3.1.0=-1 Fo! an$enna #o!$ 2& $:e #!econg no!a$on el no$ #!een$. Table 5...1.5-1: Nu$ber of bi#& for %recoding infor$a#ion. Nu$ber of an#enna %or#& a# eNode
Nu$ber of bi#& for %recoding infor$a#ion
2
0 2
T:e n8e! o $!anon la'e! e?8al $o 2 o $: coewo! a!e enale@
$!an$ 5e!$' 8e coewo! * enale w:le coewo! 1 ale. B8$ $:e DCC o!a$ wll 8e DCI o!a$ 2= no a$$e! #a$al 8l$#leng o! $!an$ 5e!$'.
T!anon oe 4"
DCI o!a$ 2" !econg no!a$on n8e! o $ a #ece n Tale 0.3.3.1.0-3936.212) Table 5...1.5-: Nu$ber of bi#& for %recoding infor$a#ion. Nu$ber of an#enna %or#& a# eNode
Nu$ber of bi#& for %recoding infor$a#ion
2
% 4
Fo! an$enna #o!$ 2& $:e!e a!e 3 $ o! #!econg no!a$on& e$al no ee elow $ale" !econg no $ el a##e $o ne" Fo! 2 la'e!" !econg no coeoo% ne *
*
------------ean 2 la'e! #!econg a$!
1
1
------------ean 2 la'e! #!econg a$!
2
A
1 1
1
2 1
1
1 1
1
j
2 j
------------ean 2 la'e! #!econg a$! 8e t*e !atest +MI report on +U/C. sin' t*e precoder(s$ indicated by t*e reported +MI(s$
Fo! 1 la'e!" !econg no coeoo% ne * * ------------ean 2 la'e!" T!an$ 5e!$' 1
1
------------ean 1 la'e! #!econg a$! 1 1 < 2
2
2
------------ean 1 la'e! #!econg a$! 1
1 T < 2
3
3
------------ean 1 la'e! #!econg a$! 1
j <
4 0
4 ------------ean 1 la'e! #!econg a$! 1 j < 2 A ------------ean 1 la'e! #!econg a$! wll 8e $:e la$e$
T
T
2
T
+MI report on +U/C. sin' t*e precoder(s$ indicated by t*e reported +MI(s$. if RI52 as reported. sin' 1 st co!mn m!tip!ied by
2 of a!! precoders imp!ied by t*e
reported +MI(s$
6
A ------------ean 1 la'e! #!econg a$! wll 8e $:e la$e$ +MI report on +U/C. sin' t*e precoder(s$ indicated by t*e reported +MI(s$. if RI52 as reported. sin' 2 nd co!mn m!tip!ied by reported +MI(s$
2 of a!! precoders imp!ied by t*e
6.!1! Table 5...1.5-): Con#en# of %recoding infor$a#ion field for ! an#enna %or#&. 2ne code"ord:
T"o code"ord&:
Code"ord 3 enabled4
Code"ord 3 enabled4
Code"ord 1 di&abled
Code"ord 1 enabled
i# field $a%%ed #o inde' 0
i# field $a%%ed #o inde'
e&&age
2 !ayers6 Transmit diversity
0
e&&age
2 !ayers6 +recodin' correspondin' to precoder matri)
1 1
2 1
1
1 !ayer6 +recodin' correspondin' to precodin' vector
1 2
1 < T
1
1 !ayer6 +recodin' correspondin' to precoder vector
2 j
1 !ayer6 +recodin' correspondin' to precoder vector
1
T
j <
3
2 !ayers6 +recodin' accordin' to t*e !atest +MI report on +U/C. sin' t*e precoder(s$ indicated by t*e reported +MI(s$
%
reserved
reserved
3
reserved
2
1 !ayer6 +recodin' accordin' to t*e !atest +MI report on +U/C. sin' t*e precoder(s$ indicated by t*e reported +MI(s$. if RI52 as reported. sin' 1st co!mn m!tip!ied by
j
2
1 !ayer6 +recodin' correspondin' to precoder vector
1 j T <
1
2
1 1 T < 2
%
1
2 !ayers6 +recodin' correspondin' to precoder matri)
1 1
2
1
2 of a!!
precoders imp!ied by t*e reported +MI(s$
TM7 mode: Fo! $!anon oe 7 & can 8##o!$ one #o!$ an $wo #o!$ . /8=n$ennao!$ 1 $anonMoe TM7 DCI 1 - #o!$ 0--------------eao!ng
Cell-,S ---- #o!$ *
D-,S ---- #o!$ 0
<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< /8=n$ennao!$ 2 $anonMoe TM7 DCI 1 - #o!$ 0-------------- Beao!ng
Cell-,S ---- #o!$ *& #o!$ 1 D-,S ---- #o!$ 0 <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< Fo! eao!ng &$:e DSC wll 8e #o!$0 &an no a$e! ,,U :a 2 o! 4 o! ; #:'cal an$enna & Baean wll en $:e ae gnal n all $:ee #:'cal an$enna& 8$ e5e!' an$enna :a e!en$ #:ae an a#l$8e. So n $: oe& ,,U :a no #!a!' an econa!' an$enna . =n o! /8=n$ennao!$ 1 an /8=n$ennao!$ 2 & $:e eao!ng $:e an e!ence o! Cell-,S & :en /8=n$ennao!$ 1& Cell-,S enng on #o!$ * :en /8=n$ennao!$ 2& Cell-,S enng on # o!$ * an #o!$ 1.
T: e!ence wll 8$ #ac$ $:e ,E w:c: 8e o! DSC a$a. <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< Une! TM7 oe& can 8##o!$ eao!ng an $!an$ 5e!$' 8ng e!en$ DCI o!a$ .DCI 1 o! eao!ng an DCI 1= o! $!an$ 5e!$'. /8=n$ennao!$ 1 $anonMoe TM7 DCI 1= - #o!$ *-----------ngle-an$enna #o!$& #o!$ * Cell-,S ---- #o!$ * T: oe 8$ l%e TM1 <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< /8=n$ennao!$ 2 $anonMoe TM7 DCI 1= - #o!$ *& #o!$1 --$!an$ 5e!$' Cell-,S ---- #o!$ *& #o!$ 1 T: oe 8$ l%e TM2
eN, *avin' to antenna ports# 7it* TM. no t*e sc*ed!er *as % options
1# T) diversity(1 codeord mapped to 2 !ayers$ 2#/patia! m!tip!e)in'(2 codeord mapped to 2 !ayers$ %#(not sre$/patia! m!tip!e)in'(1 code ord mapped to 1 !ayer$
+D/C transmission modes for t*e UE8s C-RNTI# ere e ta!9 abot transmission mode (tm%$:t*e first of t*e for MIM; sc*emes sed in &TE %<++ re!ease =# Tm% *as a fe names6 ;pen-&oop /patia! M!tip!e)in'. ;pen-&oop MIM;. &ar'e De!ay CDD. or >st MIM; (for t*ose not concerned abot t*e detai!s of *o:## ?o 9no t*ose peop!e6 “Just give me my updates NOW! it* nostri!s f!arin' and t*eir smart p*one c!tc*ed in a deat* 'rip$# Note t*e transmission sc*eme in t*e partia! tab!e be!o (copied from %<++ T/ %4#21%$#
A UE confi'red for tm% i!! eit*er spport t*e robst and re!iab!e @transmit diversity or a version of *i'* t*ro'*pt MIM; named @&ar'e-de!ay cyc!ic de!ay diversity or @&ar'e-de!ay CDD# It i!! spport MIM; for 2. % or transmission !ayers# Transmission mode % *as t*e best of bot* or!ds6 spport for robst transmission and *i'* t*ro'*ot MIM; it*ot a!! t*e comp!e)ities of t*e ot*er % MIM; transmission sc*emes# /o t*is tm i!! spport fi)ed and mobi!e app!ications in addition to mac*ine-tomac*ine apps in t*e same ce!!# T*is mode doesn8t *e!p cate'ory 1 UEs mc* since t*ey don8t spport D& MIM;# T*in9 of tm% as t*e entry point for MIM;# It is probab!y t*e simp!est MIM; transmission sc*eme to spport as it doesn8t reBire as mc* feedbac9 from t*e UE (!ess comp!e)ity in t*e UE$ as it does for t*e ot*er MIM; sc*emes and t*e decision-ma9in' is redced in t*e eN,# &ess MIM; or9 to do for a!!
E)cept"#####no t*e eN, needs to ma9e rea! decisions on *at transmission mode to se for eac* individa! UE# ,t it is probab!y simp!er t*an it sonds# ,ased on t*e CI and RI va!es (no +M feedbac9 reBired$ received from t*e UE. t*e sc*ed!er softare in t*e eN, i!! dynamica!!y c*oose *et*er to transmit sin' t*e transmit diversity sc*eme or t*e !ar'e-de!ay CDD sc*eme# /o even if yor device spports MIM;. it on8t 'et MIM; transmissions n!ess t*e estimated D& c*anne! Ba!ity is above a certain t*res*o!d and Ran9 Indication is 'reater t*an 1# T*e UE confi'red for tm% i!! do simi!ar feedbac9 reportin' as tm1 and tm26 CI and RI. e)cept t*e CI va!es i!! be based on t*e reported RI###so a reported RI of 1 means report CI based on transmit diversity transmission e!se report CI based on a transmission sin' !ar'e-de!ay CDD transmission sc*eme it* 2. % or transmission !ayers# /ince no +MI feedbac9 is reported. t*e precodin' matri) va!e for transmit diversity (on 2 or antennas$ is a defined form!a in t*e %<++ standards# or !ar'e-de!ay CDD. t*ey se a 9non de!ay va!e it* a 9non precodin' matri) va!e for 2-antenna transmissions and for antennas t*ey se a pre-defined sbset of p to precodin' matrices dependin' on t*e nmber of transmission !ayers sed (i#e# se a different precodin' matri) on eac* transmission !ayer$# 7*i!e t*is means !ess decision-ma9in' by t*e eN, and !ess comp!e)ity in t*e UE (no +MI measrements$. yor +MI va!es aren8t based on t*e crrent c*anne! conditions so MIM; performance may not be consistent in different c*anne! conditions# /ince MIM; is spported by tm%. t*e UE no needs to start !oo9in' for anot*er DCI in t*e D& contro! c*anne!6 DCI ormat 2A# DCI format 2A records *ave t*e additiona! fie!ds to spport transmission of 2 codeords (on!y one for transmit diversity$ and a!so inform t*e UE of *o many !ayers for !ar'e-de!ay CDD so it 9nos *ic* precodin' matri) va!es i!! be sed for t*e D& MIM; transmissions# ormat 2A a!so !ets t*e UE 9no *et*er 2 or antennas are bein' sed for transmit diversity# Transmission mode % is yor entry-!eve! MIM; so yo can en>oy t*e benefits of *i'*er speed data (*en c*anne! conditions a!!o$ it*ot a !ot of additiona! feedbac9 and sti!! 'et t*e benefits of robst transmit diversity (*en c*anne! conditions reBire it$# appy o!idays
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3GPP
LTE
新通訊 2010 年 9 月號 115 期《 技術前瞻 》 文．簡均 /!"# /$%&
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(lock .ode)Ü»À9«¬助hÃÄ訊ÝÞß¡¢iÜà9T\u¬áâãY²äåd žghÃÄ訊號923通Å實體nlŒæ通Å (PD.H) X實體jlŒæ通Å(PU.H) 6ghnklm¸Â .ç.è4½éŒo¸ê(15450D)² %atial $lti%le6 ¬助h¤W2345Xëϯì(ched$ling Gain)9{‡TíkîïÀ(Pa"alleli*ed T$"o .ode) Ü໼ðñò9ó¬助h¤W¿À45dôvõ9 LTE 實體層ö÷ 50D/øùúŒo¸ÂLM(.40DA)ûHPQj9Gk(ü„ý‰技術CR9œ¸天, -.ûHcA1»¼Ü½ÀcAdþÿi 章節裡9«說明1剖析§ü„關鍵技術d
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