TWI305094B - Method and system for link adaptation in an orthogonal frequency division multiplexing (ofdm) wireless communication system - Google Patents

Method and system for link adaptation in an orthogonal frequency division multiplexing (ofdm) wireless communication system Download PDF

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TWI305094B
TWI305094B TW094125662A TW94125662A TWI305094B TW I305094 B TWI305094 B TW I305094B TW 094125662 A TW094125662 A TW 094125662A TW 94125662 A TW94125662 A TW 94125662A TW I305094 B TWI305094 B TW I305094B
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channel
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channel quality
quality indicator
subchannel
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TW200623697A (en
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Koo Chang-Soo
Zhang Guodong
Lind Olesen Robert
Yingming Tsai
Huang Yuejin
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Interdigital Tech Corp
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2626—Arrangements specific to the transmitter only
    • H04L27/2646—Arrangements specific to the transmitter only using feedback from receiver for adjusting OFDM transmission parameters, e.g. transmission timing or guard interval length
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/20—Monitoring; Testing of receivers
    • H04B17/24—Monitoring; Testing of receivers with feedback of measurements to the transmitter
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0417—Feedback systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/0632—Channel quality parameters, e.g. channel quality indicator [CQI]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0026—Transmission of channel quality indication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0224—Channel estimation using sounding signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0044—Arrangements for allocating sub-channels of the transmission path allocation of payload
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0058—Allocation criteria
    • H04L5/006—Quality of the received signal, e.g. BER, SNR, water filling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
    • H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0015—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy
    • H04L1/0016—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy involving special memory structures, e.g. look-up tables
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/38—TPC being performed in particular situations
    • H04W52/42—TPC being performed in particular situations in systems with time, space, frequency or polarisation diversity

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Quality & Reliability (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Radio Transmission System (AREA)

Description

13〇5〇94 九、發明說明： 發明所屬之技術領域 本發明係有關一種正交分頻多工(OFDM)無線通信系 統。更特別是，本發明係有關一種正交分頻多工無線通信系 統中鏈結適應方法及系統。 先前技術 藝目刖無線通k系統係提供如對用戶無線網際網路存取 之寬頻服務。這些寬頻服務係需多路衰落頻道上之可靠及高 速率通仏。正父分頻多工係為減輕多路衰落效應解決方案^ 一。多輸入多輸出（ΜΙΜΟ)及正交分頻多工之組合 (OFDM-MIMO)技術可將高頻寬效率帶給區域網路(LAN)或 廣域網路(WAN)環境。 為了有效操作無線通信系統，係需要通信參數之鏈結適 應。鏈結適應係為選擇包含編碼速率，調變設計，傳送功率 或類似者之通信參數以最大化產出之一方法。 • 乡輸人端輪出及正交分财讀合系統巾，注水功率/ 位元分配(W··烈建議來最大化下鏈容f。為了正確決 定注水功率/位元分配方案，不僅要知道子頻道相關，亦要 知道子頻道辨相關。此資訊之傳賤需頗多支出。於是， 預期具有發送該訊息之替代方法。 發明内容 正又勿頻多工無線通信系統中鍵結適應方法及系統係 6 1305094 被提供。子頻道係被分為複數組。頻道品質指標(CQI)係以 各組子頻道之頻道品質狀況為基礎被產生給各組，而各子頻 道之通信參數係依據頻道品質指標來調整。 實施方式 此後’以下實施例係參考IEEE802 11系統做解釋。然 而，應注意該實施例並不限於IEEE8〇211系統，而可應用 至任何無線通信系統。
饭又々~W’ )V..U}係為第t傳送天線及第r接收夭 線間之頻道之長度W之時域頻道響應向量。係數之平於 功率係藉由與t及r值無關之伞申，,)|2}來表示。此係因多輕 之天轉狀倾料小料-抵達邮 IEEE802.ll 頻道響應之50-HS 示為： a/n中’ 20-MHz採樣速率係被使用 ¥間解析度。正規化功率延遲輪廊 ’產生 可被表
σ/ = G'le~KT,s〇) =G"le~a'1 其中(2=50/Γ， 微 ^-1 /«〇
ai l^e^aW 表丁之Γ係為路禮(叢集)之功率延遲時間常數 (方程式1) ’針對aw»l，而以毫
第-數平均功率係產生》。參數I 同路徑之平均卿，知^^之_—定。為了句 〜道她^徑之傳播距離。因為上述例 1305094 _續期間為5 公尺。因此_ 你所以兩連續路徑間之傳播距離係為I5 右Dl表不第1路徑以公尺表示之俾巍％/-Di+i-D1+15 , ]=：π t , 尺財之飾路，則 徑之功率損失峰·，其損失，僅考慮第二雜對第一路 ^+15? ^l〇S6 ' 〇 ) A+is、3.5 一- 抑。 其中Dfree係為自由空間傳播空間。當 α及功率延遲時間常數Γ 疋，數 (方程式2) 則頻道係為可 „ , ^ p _ …，ν7Γ w旺。富 Kloss被给； α及功率闕日相常針可H由㈣絲式來計算 ea =Ri〇ss 假設D—咖，心及、“ （方程式3) d a及r值係被顯示於表1有〇若 千典型值。室内Γ平始括a& _ 以毫微秒表示之r — 70 -—— 50 ——..... 32 — 24
^ 1 ’ ’·，处1)}係為第t傳送天線及第r接收天線 間之頻道之^ p道麵向量。也就是說，〃㈣包含p 子頻道。第P子頻道可被表、. 8 1305094 其中r (方程式4) 心=Pl及第P2子頻道間之相_被定義為 假没矿°為具有零平均之複合高斯變數， 關。依據方程式1， ΡΪ1 =£ (方程式5) 且若，則與;^>無 fw-\ 、’:0 y、啦〇 Ψ~1 其與值t及r無關。假設—p2，k=Q i 則方程式6可被重寫為 ’ (方程式6) ，P-1 且 a W>>1，
Pk
•jink IP _ (方程式7) 變數k絲考慮下奸頻道之附曝子頻龜。從方， Ια 卜- 1_e (方盘~*V 第-圖顯讀對當P = 256時，技干典型值 相關。由於參數α降低，被間隔k子載體之兩子二 關係被降，。依據方程式i〜參數j愈小’路徑平均二率二 多。也就是說’賴祕包含更有效多路徑，频: 頻率選擇性。限制例中，^k值α 0，|Α| 〇。 ’、 方面，若頻道為平缓衰落(非頻率選擇性），則任何让 〇〇，|A| = 1。 值 α 第二圖顯示針對當α =0.64時，Ρ之兩值之㈧對k相 關。由於p降低’相關曲線變成窄線性。例如，p=64及 9 1305094 具有k>〇.9之子頻道必須分別被間隔小於4及16子載體。 為了使用”水填充”’頻道品質指標測量必須被定義。頻道品 質指標應以子頻道功率為基礎來建構。雖糊表示被間隔k 子載體之兩子頻道間之相關，但其並不清楚顯示兩子頻道功 率之相關。因此，子頻道功率之相關應被導出。子頻道功率之相 關係被定義為 r Ρ\>Ρι
E K：14 (方程式9) 由於aW»l，則
E 1 + e' (方程式10) 且 (!-‘
E 1+e"a斤―石(方程式11) 其中k=Pl—P2e[0，w-1]。方程式10及方程式U係與t及r 值無關。方程式10及方程式u之導出中，係假設多路徑係 數之實及虛部分(令/f)，㈣別])具有相同變異且彼此獨 立。將方程式10及方程式U帶入方程式9產生 ' _ 2D-gcos(2戒/P) + e~2ttum2(l + g、 0+3H、s⑽Ρ)+β) (方程式卬 第三圖顯示針對當p==256時，0：若干典型值之匕對k 相關。從第三圖，k=P/2處之相關^最小值約為〇.5。也就是 說，被間隔P/2子載體之兩子頻道統計上可能具有3dB功率 差。因此，不必報告各子頻道之頻道品質指標。第四圖顯示 針對當α =0.64時，不同子頻道p數之匕對]^曲線。當p值 10 I305094 被降低時1崎雜性收縮。
_道係被分^依f本發明之鍵結適應處理谓流程圖。子 之頻道稷數組(步驟规）。第六圖顯示各組子頻道 、…曰軚產生。第六圖中，子頻道全部被分割為 二=含具有△，之△連續子頻道。不同二Q 組中兩子頻道間之功率統
〇<^：^Δ-1
指標細各財頻道W狀況被產生給各組 GW。頻道品^況可藉由包含但不限於信號雜訊比 (SNR) ’、位元錯鱗(臟），封包錯誤率(pER)，或類似者之 不同方法來分析。此後’以下實_係參考信號雜訊比來解 釋。然而’應了解其他方法可被替代實施。假設崎標示第 t—傳达天線之遞q頻道品質指標㈣山…糾而 t-〇，l，...，NT-l)，ca^<)較佳被言十算為 叫0 = 5+|_1〇1〇氏。〇^)」 (方程式13) 其中W係為擔或之最大整數，B為應料統要求為 基礎被決定之整數。信號雜訊比係為計算為 r=0 /=〇 ^()4ΣΣΚίΙ (方程式14) 11 1305094 R係為接收天線數，“2係為各子頻道中之雜訊變異。 、、頻道品質指標係被回授調整通信參數(步驟506)。因為 =道。。質指標係以财之子頻絲產生，所以⑽τ頻道品 質指標總數被產生於傳漏(封包)中，其中Ντ係為傳送天線 因為頻道於巾貞(封包)區間中很少改變，所以必須以正交 ^頻多工符號為基礎來報告頻道品質指標⑹因為射頻震盡 裔及相鎖迴輸合卿起之制她差(CPE)，所以頻道響 應相位可歧變。細，該改變並不影響子舰之功率。因 此V員道ασ|可以被估計自幀基礎之長訓練佇列之頻道 響應，基礎而不使用被插人正交分頻多卫符號之前導音調 來。十算》亥被插入剛導音調係僅被用來修正共用相位差。 *例如’若各頻道品質指標標示對應調變設計(雙相移鍵 控(BPiK) ’正交移相鍵控(QPSK) ’ 16正交振幅調變(QAM)， 料正交振幅調變)之四狀況之一，則若干2你价位元係被 要求報告財頻道品質指標。典型例巾，q=i6aNt=4，2 ^ΝΤ==128位元係被要求報告親品質指標。與傳送幢中 貝料數相％t ’此係合理的。可替代是，頻道品質指標可代表 兩個或更多通信參數之組合，如編鱗率及婦順序之組 合。 、因為子頻道任何配對統計上具有最大勘功率差，所 以依據方程式13崎告之紐品f||標對編碼速率而非調 艾汉计之料更有意義。因此，當依據不同子頻道組之被報 〇頻道ασ貝5周整編碼速率時，所有子頻道之調變設計均 可保持固定。此例中，調變設計可依據以下來決定 12 1305094 (方程式15) 之· 一整數。信號雜訊比係被決 ’)=0+卜％。(_«)」 其中c為應統要求被決定 定如下： SNR(,)
Wr-IIT-I 2 ΣΣΝΊ ki R r=0 /=〇 可、竖0 、 （方程式16) '疋員道估计之後，具有相當強功率之路徑可被選擇。選擇 “有相田強功率之路控後，有效雜數係被降低為通常小於w之
卜 為有效頻道響應，而K為標示Μ路 錄置之向量。有了❿及κ，各天線之所有子猶首先可使用方 、來十算而5周變及編碼設計接著可被決定最佳化。參考子载 體之多輸入多輸出頻道矩陣可被傳送來校準。 右干，擇及標移考子細之實施_如下。—實施例 #。=係配置參考子讎，^網路及用彳均知道子載體指 :;疋參考子載體指標通常不被報告至傳送器。另一， =中’接收器可以頻譜中所有子載體及其他因子瞬間頻道 轉移功能祕礎來動_擇參考子载體。純器可 子载體指標並將該指標報告至傳送器。 、第七圖係為鏈結適應系統700圖示。系統7〇〇係一 頻道品質指標產生器7〇2及一鏈結適應器綱。頻道品二 標產生器702係以被接收信號7〇6之頻道品質狀況為其= 1子頻道品魏標。被頻道品f指標^生器 搬所產生之頻道品質指標7〇8係被轉送至鏈結適應 來產生可調整通信參數之控制㈣⑽。聽參數^包°含伸 13 1305094 不限於編碼速率，霞模式，傳送功率位準或類似者。鍵於 適應器7〇4可包含依據輸入頻道品質指標調整通信 一 查找表。頻道品質指標產生器徹可位於無線傳送/接$ 凡(WTRU)，基地台或兩者處。鏈結適應器7〇4可位於 傳送/接收單元，基地台或兩者處。 …、v ，上述實施例之多輸入多輸出及正交分頻多工組合之傳 送器及/或接收器可被用職祕送/接收單域基地台中。 傳送器及/或接收器元件可被f施為單積體電路⑽，^積體 電路’邏輯可程式閘極陣列(LPGA)，分離組件或任何這些 體電路，邏輯可程式閘極陣列及/或分離組件之組合。
無線傳輸/接收單元係包含但不限於使用者設備，行 動台，岐或行動用戶單元，呼叫器，或可操作於益線 環境中之任何其他類型元件。基地台係包含但不限於B 節點，位址控制器，存取點或無線環境中之任何盆 介裝置。 雖然本發明之特性及元件被以特定組合說 實施例中，但各特性及元件可不需較佳實_之其㈣ 性及元件而被單獨使用，或有或無本發明其他特性及元 件之各種組合中。 14 1305094 圖式簡單說明 第1圖顯示針對當P = 256時，α若干典型值之Η對k 相關。 第2圖顯示針對當α = 0.64時，P之兩值之W對k相關。 第3圖顯示針對當P = 256時，α若干典型值之&對k 相關。 第4圖顯示針對當α =0.64時，P之兩值之&對k相關。 第5圖係為調整通信參數之處理流程圖。 • 第6圖顯示各組子頻道之€(^°產生。 第7圖係為鏈結適應系統圖示。 元件符號說明 500鏈結適應處理 700鏈結適應系統 706被接收信號 708頻道品質指標 ® 710可調整通信參數之控制信號 15

Claims (1)

1305094 十、申請專利範圍： 士種於正交分頻多工(〇FDM)無線通信系統，謂整通 ㈣結之方法，财法包含： 心猶 將子頻道分割為複數組； 指標的頻道品質狀況為基礎產生各組之頻道品質 依據該頻道品質指標來調整通信參數。 桿是tit專利制第1項之方法，其+該親品質指 =m)。'蝴誤柳物包錯誤率 子頻==項之方法’其―據 4·如申請專利範圍第丨項之方 標是以頻道響應為美礎 一中该頻道品質指 長剌練件列所估計Γ ° °〆頻道響應是以鴨基礎而從 5.如申請專利範圍第i項之方 碼速率是依據對應該子頻道 : ’員道之編 6·如申凊專利範圍第5項之方法，其中 整 變模式亦依據對應該子頻道之該 屬道之調 7如―錢道f指標來調整。 調變模式是依據全部子頻道為基產頻道之 標來調整。 產生之s周邊模式指 8.如申請專魏圍第丨項之枝，其中 標表示兩個或更多通信參數之組合。 5Λ/、叩質指 16 1305094 9.如申請專利範圍帛1項之方法，it-步包含選擇具 有相對強功率之路徑之步驟，藉此將龍選擇路經之有 效頻道響應及標示該經選擇路徑位置之向量進行傳送以 調整該通信參數。 瓜如申請專利第1項之方法，其巾—參考子載 以 體的多輸入多輪出(MIM0)頻道矩陣於傳送站處進 用於校準。 11, 齡正交分頻多純t鏈結適應系 統，該系統包含： 頻道口⑻曰標產生器’以各組子頻道之頻道品質狀況 ，基礎來產生各組子頻道之頻道品姑標，該子頻道被分割 為複數組；及 統，其中該頻道品質 錯誤率及封包錯誤率之一所產 一鏈結適應器’依據該頻道品質指標來調整通信參數。 12.如申請專利範圍第n項之系 指標是從信號雜訊比、位元 生。 13·如申請專利範目第2丨項之純’其中該組數是依 據子頻道功率的相關來決定。 U·如中請專利範圍第u項之系統’其中該頻道品質 頻應為基礎而計算，該頻道響應是 攸長訓練佇列所估計。 ⑸艸請專抛項之純， 編碼=是依據對應該子頻道之該頻道品質指標來胃 調整。 16.如申請專利範圍第15項之系統，其中各子頻道之 17 1305094 模式亦依據對應該子頻道之該頻道品質指標來調整。 17.如申請專利1請第11狀祕，其中所有子頻道 式是依據全部子頻道為基礎所產生之 指標來調整。 彳、式 4 18.如申請專利範圍第Π項之系統，其中該頻道品質 指標表不兩個或更多通信參數之組合。 、 如申請專利範圍第u項之口系統，其中該鍵結適應 盗匕各可依據該頻道品質指標調整通信參數之一查 ％、 20.如申請專利範圍第u項之該系統;可 :=:Γ力率之路徑之-衷置，籍此將 >t、、，、^貞道響應及標補被選擇路徑位置之向量進 行傳送以調整該通信參數。 二如:請專利範圍第11項之該系統，其中-參考子 =的夕輸人多輪出頻道矩陣於傳送站處進行傳送以用於 二無線傳輸/接收單元~ 為基道之頻道品質狀況 為複數組，傳送該頻道品質指標，使得傳 j 該頻道品質指標來調整。 口’可依據 23.如申請專利範圍第22項之無 Ή亥頻道品質指標是從㈣雜 :$妾收單元’其 率之一所產生。 70錯誤率及封包錯誤 28 1305094 24.如申請專利範圍第22項之無線傳輸/接收單元，其 中該組數是依據子頻道功率的相關來決定。 25.如申請專利範圍第22項之無線傳輸/接收單元， 其中該頻道品質指標是以頻道響應為基礎而計算，該頻道 響應是以幀基礎而從長訓練符列所估計。 _ 26.如申請專利範圍第22項之該無線傳輸/接收單 疋’其中該縣品質指標表示兩個或更多通信參數之組合。 27.如申請專利範圍第22項之無線傳輸增收單元: 步包含選擇具有相對強功率之路牛 ^ 該經選擇路徑之有效頻道塑 ：々’’猎此傳送 之向量來調整該通信參數I 選擇路徑位置
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