TW200803260A - Spatial pilot structure for multi-antenna wireless communication - Google Patents
Spatial pilot structure for multi-antenna wireless communication Download PDFInfo
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Description
200803260 九、發明說明: 【發明所屬之技術領域】 本發明一般係關於通信,且更明確而言係關於用於無線 通信系統之發送技術。 【先前技術】 ‘ 無線通信系統係廣泛展開以提供各種通信服務,例如聲 ‘ 音、視訊、封包資料、訊息、廣播等。此等系統可以係能 夠藉由共用可用系統資源而支援多個使用者的多接取系 ⑩ 統。此類多接取系統之範.例包含分碼多向近接(CDMA)系 統、分時多向近接(TDMA)系統、分頻多向近接(FDMA)系 統、正交FDMA (OFDMA)系統、以及單載波FDMA (SC-FDMA)系統。 多向近接系統可利用一或多個多工方案,例如分碼多工 (CDM)、分時多工(TDM)等。該系統可加以展開並可為現 有終端機服務。可能需要改良該系統之效能,同時保持對 φ 現有終端機的回溯相容性。例如,可能需要使用空間技術 (例如多進多出(ΜΙΜΟ)及分空間多向近接(SDMA))以藉由 開發由多個天線之使用所提供的額外空間微數來改良輸出 _ 及/或可靠性。 一多天線通信系統支援從多個(Τ)發射天線至多個(R)接 收天線的多進多出(ΜΙΜΟ)發送。藉由Τ個發射天線與R個 接收天線形成的一 ΜΙΜΟ頻道係由S個空間頻道組成,其中 S$min{T,R}。S個空間頻道可用於並列發送資料以達到較 高的總體輸出及/或冗餘地用於發送資料以達到更大的可 118977.doc 200803260 靠性 在接收器中通常需要發射器與接收器之間的—無線頻道 之精確估計錢恢復㈣該無線頻道料的資料。通常藉 由從發射器傳送-前導並在接收器中測量該前導來執行頻 道估計。該前導係由發射器及接收器已知之先驗的符號所 組成。接收器因此可以根據接收的符號及已知的符號來估 計頻道響應。 多天線系統支援職〇接收器(其係裝備有多個天線的接 收器)。麵Ο接收器通常需要不同的頻道估計並因此具有 對前導的不同要求’如以下說明。因為前導發送表示多天 線系統中的附加項,所以需要最小化前導發送至可能的範 圍。然而,前導發送應該係:M細接收器可以獲得足夠 品質的頻道估計。 因此在該技術中需要用於在多天線系統中有效率地發送 一前導之發送技術,其可以支援空間技術,同時保持對現 有終端機的回溯相容性。 【發明内容】 本文說明用於發送—空間前導以支援-多天線及多層發 达通信系統中的趣〇接收器之技術。依據本發明之_項 具體實施例,說明發送無線通信系統中的前導之方法。該 方法包含產生用於單一層發送的第一層前導。該第一層前 導係在-第-0聰符號中橫跨副頻帶而重複,並且偏移 於該第符號之該第_層前導,橫跨—鄰近第二 〇匪符狀副歸錢㈣―層料。㈣發送該等第 118977.doc 200803260 一及第二OFDM符號。 依據本發明之另一項具體實施例,說明無線通信系統中 的一裝置。該裝置包含一前導產生器,其可運作以根據若 干發送層來產生至少一個前導,其t該至少一個前導之每 . 個係橫跨一第一 OFDM符號之副頻帶而重複。該至少一個 • 刖導係進一步橫跨一鄰近第二OFDM符號之副頻帶而重複 亚從該第一 OFDM符號之該至少一個前導之其他者偏移。 • 肖裝置進一步包含複數個發射器單元,其可運作以經由複 數個發射天線在個別數目之層發送中發送第一及第二 OFDM符號之每個。 依據本發明m具體實施例,說明執行無線通信系 充中的頻道估5十之方法。該方法包含經由複數個接收天線 獲得接收的符號,每個符號包含一第一層前導,其中接收 的符唬之鄰近者包含在副頻帶中彼此偏移的第一層前導。 j方法進-步包含根據第—層前導來處理接收的符號以獲 • π該複數個發射天線與該複數個接收天線之間的複數個頻 道之估計。 依據本發明之另—項具體實施例,說明無線通信系統中 —裝置。該裝置包含複數個接收器單元,其可運作以提 供接收的符號,每個符號包含一第_層前導,其中接收的 符號之鄰近者包含在副頻帶中彼此偏移的第—層前導。該 裝置進-步包含一頻道估計器,其可運作以根據第一層前 導來處理接收的符號以獲得該複數個發射天線與該複數個 接收天線之間的複數個頻道之估計。 118977.doc 200803260 【實施方式】 本文說明的發送技術可用於各種無線通信系統,例如 CDMA、TDMA、FDMA、OFDMA與 SOFDMA 系統。通常 互換使用術語「系統」及「網路」。CDMA系統可實施無 線電技術,例如cdma2000、通用陸上無線電接取 (UTRA)、進化式 UTRA(E-UTRA)等。cdma2000 涵蓋 IS-2000、IS-95 及 IS-856 標準。UTRA 包含寬頻€〇]\4八(貿-血 CDMA)及低碼片速率(LCR)。TDMA系統可實施無線電技 術,例如全球行動通信系統(GSM)。OFDMA系統可實施無. 線電技術,例如長期進化(LTE)、IEEE 802.20、Flash-OFDM®等。在來自稱為「第三代合作夥伴計晝」(3GPP) 的機構之文件中說明UTRA、E-UTRA、GSM及LTE。在來 自稱為「第三代合作夥伴計晝2」(3GPP2)的機構之文件中 說明cdma2000。此等各種無線電技術及標準在該技術中已 為人所瞭解。 • 為清楚起見,以下針對實施IS-856的高速率封包資料 (HRPD)系統而說明該等技術之各方面。HRPD係亦稱為最 佳化進化資料(EV-DO)、最佳化資料(DO)、高資料速率 … (HDR)等。通常互換使用術語HRPD及EV-DO。當前,
. HRPD修訂(Revs.)O、A及B已得到標準化,HRPD修訂0及A 得到展開,以及HRPD修訂C係在開發中。HRPD修訂0及A 涵蓋單一載波HRPD(lxHRPD)。HRPD修訂B涵蓋多載波 HRPD並且係與HRPD修訂0及A回溯相容。本文說明的技 術可併入任何HRPD修訂中。為清楚起見,在以下說明中 llS977.doc 200803260 較多地使用HRPD術語。 圖1顯示具#多個接取點110及多個終端機12〇的耐D通 信系統1〇〇。-接取點通常係一固定台,其與終端機通信 並亦可稱為一基地台、節點B等。每個接取點m提供用於 特定地理區域的通信覆蓋並支援定位在該覆蓋區域内的終 端機之通信。接取點110可搞合至一系統控制器13〇,該控 制器提供對此等接取點的協調與控制。系統控制器13〇可 包含網路實體,例如基地台控制器(BSC)、封包控制功能 (PCF)、封包資料伺服節點^加叫等。 終端機120可加以分散於整個系統中,而且每個終端機 可以係固定或行動的。終端機亦可稱為接取終端機、行動 台、使用者設備、用戶單元、台等。終端機可以係蜂巢式 電話、個人數位助理(PDA)、無線器件、手持式器件、無 線數據機、膝上型電腦等。終端機可支援任何HRPD修 «丁在HRPD中,終端機可在任一給定時刻從一個接取點 接收前向鏈路上的發送並可傳送反向鏈路上的發送至一或 夕個接取點。别向鏈路(或下行鏈路)指從接取點至终端機 的通信鏈路,而反向鏈路(或上行鏈路)指從終端機至接取 點的通信鍵路。 圖2顯示一單—载波時槽結構2〇〇,其支援HRPD中前向 鏈路上的CDM。將發送時間線分割成時槽。每一時槽具有 1.667¾秒(ms)的持續時間並跨越2〇48個碼片。對於1 2 百萬碼片/秒⑽㈣之碼片速率而言,每一碼片具有咖 奈秒㈣的持續時間。將每—時槽劃分成兩個相同的半時 118977.doc -10- 200803260 槽。每一半時槽包含⑴一附加項區段,其係由半時槽中心 處的别‘區#又與該别導區段之兩側上的兩個媒體接取控 制(MAC)區段組成;以及(ii)該附加項區段之兩側上的兩個 讯務區段。訊務區段亦可稱為訊務頻道區段、資料區段、 資料攔位等。前導區段承载前導並具有96個碼片的持讀時 間母mac區段承載發信(例如反向功率控制(Rpc)資 訊)並具有64個碼片的持續時間。每個訊務區段承載訊務
資料(例如用於特定終端機的單播資料、廣播資料等)並具 有400個碼片的持續時間。 HRPD修訂G、A及B將CDM用於在訊務區段中傳送的資 料。訊務區段可承載用於藉由一接取點所飼服的一或多個 終端機之CDM資料。詩每—終端機的訊務資料可根據由 從該終端機接收的頻道反饋所決定的編碼與調變參數加以 處理以產生貧料符號 '用於—或多個終端機的資料符號可 加以解多工並採用16碼片Walsh函數或碼加以覆蓋,以^產 生用於訊務區段的CDMf料。因此使用偏化函數在時域 中產生簡資料。CDM訊務區段係承载cdm資料的訊務 區段。 可能需要將OFDM及/或單一载波分頻多工(sc_fdm)用 於在訊務區段中傳送的資料。〇FDM及Sc_fdm將可用頻 寬分割成多個正交副载波,其亦係稱為载頻調、頻格等。 可採用資料來調變每-副載波。-般而言,在頻域中採用 OFDM並且在時域中採用SC_FDM來傳送調變符號。〇職 及SC-FDM具有某些合乎需要的特徵,例如輕易抵抗由頻 118977.doc 200803260 率選擇性衰退引起的符號間干擾(ISI)之能力。OFDM亦可 以有效率地支援ΜΙΜΟ及SDMA,其可獨立地應用於每一 副載波並因此可提供頻率選擇性頻道中的良好效能。為清 楚起見,以下說明用於傳送資料的OFDM之使用。 可能需要支援OFDM,同時保持與HRPD修訂0、A及B的 回溯相容性。在HRPD中,前導及MAC區段可始終藉由所 有作用中終端機加以解調變,而訊務區段可僅藉由得到伺 服的終端機加以解調變。因此,可藉由保留前導及MAC區 段並修改訊務區段來達到回溯相容性。藉由採用具有400 個或較少碼片的總持續時間之一或多個OFDM符號來取代 一給定400碼片訊務區段中的CDM資料,進而採用HRPD波 形傳送OFDM資料。 圖3顯示支援HRPD中的OFDM之單一載波時槽結構 3 00。為簡單起見,圖3 A顯示僅一個半時槽。半時槽包含 (i) 一附加項區段’其係由半時槽中心處的一 9 6碼片前導區 段與該前導區段之兩側上的兩個64碼片MAC區段組成,以 及(ii)該附加項區段之兩側上的兩個訊務區段。一般而 言,每個訊務區段可承載一或多個OFDM符號。在圖3A所 示的範例中,每個訊務區段承載兩個OFDM符號,並且每 個OFDM符號具有200個碼片的持續時間而且係在200個碼 片之一個OFDM符號週期内傳送。 圖4顯示具有兩個終端機120a及120b的多天線HRPD通信 系統100之一接取點110的細節。為簡單起見,接取點110 具有兩個發射天線,MISO終端機120a具有一單一接收天 II 8977.doc -12- 200803260 線,而且ΜΙΜΟ終端機120b具有兩個接收天線。 由接取點110中的兩個天線及MISO終端機120a中的單一 天線形成的MISO頻道可具有1x2頻道響應列向量包lx2的特 徵。由接取點110中的兩個天線及ΜΙΜΟ終端機120b中的兩 . 個天線形成的ΜΙΜΟ頻道可具有2x2頻道響應矩陣廷2X2的特 徵。接取點110從兩個發射天線發送一前導以使MISO及 ΜΙΜΟ終端機可估計其個別MISO及ΜΙΜΟ頻道。接取點11〇 φ 中的前導產生器112可產生一合成前導。 接取點11 0可從兩個發射天線並列發送資料至ΜΙΜΟ接收 為以改良輸出。以上說明係針對2 X 2系統,其中接取點具 有兩個發射天線並且終端機具有至多兩個接收天線。一般 而言,多天線系統可包含具有任何數目的天線之發射器及 接收器,因此Τ及R可以係任何整數值。 圖5顯示支援HRPD中的0FDM之多載波時槽結構4〇〇。 在HRPD修訂B中,多個lxHRPD波形可在頻域中加以多工 _ 以獲彳于多載波HRPD波形,其供應一給定頻譜配置並係在 第一發射天線上發送。在圖5所示的範例中,一個1xHrj>d 波形係說明為配置成一遺留頻道,其包含前導及mac區 , &,該等區段可始終由所有作用中終端機加以解調變,而 _ 1fl務區段可僅藉由得到伺服的終端機加以解調變。因此, 可藉由保持前導及MAC區段來達到回溯相容性。圖5亦顯 示三個1XHRPD波形,其係配置為在個別第二、第三及第 四個發射天線上發送的非遺留§蓄, 」开m召頻道,其並不需要附加項區 ;1又,因為〇FI>M符號包含喪入石】冲音器弋| 3甘入入田丨J頻f或载頻調中的週期性 118977.doc -13- 200803260 合成前導。如上所述’圖4之前導產生器ι12產生用於在 OFDM符號中發送的合成前導。一接收mim〇終端機 120b(圖4)接收OFDM符號中的已知合成前導並能夠得到 ΜΙΜΟ頻道響應之估計。 多天線系統可利用多個載波以進行資料及前導發送。多 個載波可由OFDM、某些其他多載波調變技術或某另一構 造加以提供。OFDM有效地將總體系統頻寬(w MHz)分割 成多個(K個)正交頻率副頻帶。此等副頻帶係亦稱為載頻 調、副載波、頻格及頻率頻道。對於〇FDM,每個副頻帶 係與可採用資料加以調變的個別副載波相關聯。多天線 〇 F D Μ系統可以僅使用用於資料及前導發送的κ個總副頻 帶之子集,並且其餘副頻帶可作為保護副頻帶以使系統可 滿足頻譜遮蔽要求。為簡單起見,以下說明假定所有尺値 副頻帶均可用於資料及/或前導發送。 圖6顯示一副頻帶結構5〇〇,其可用於多天線〇fdm系統 中的W導發送。在用於前導發送的p個前導副頻帶之每個 上傳送-發送符號’其中通常κ>ρ。為改良效能及簡化接 收為處理’ Ρ個前導副頻帶可加以均勻地分佈在Κ個總副頻 帶上以便連續的前導副頻帶係隔開Κ/Ρ個副頻帶。其餘的 Κ-Ρ個副頻帶可用於資料發送並且係稱為資料副頻帶。 圖7Α至7D顯示用於多天線〇1?1)]^系統的示範性前導發送 方案。本具體實施例利用空間前導载頻調,其係依據由多 天線OFDM系統所形成的層或波束之數目而不同地形成。 明確而吕,因為一層可藉由天線的組合所產生的一波束而 118977.doc -14- 200803260 加以形成,所以頻道之精確特徵無法僅依賴於一天線之前 導而必須依賴於形成用於特定層或波束的一前導。依據圖 7A至7D之空間前導發送方案,每層前導功率預算隨空間 層之數目的減少而增加。 圖7A說明橫跨0FDM符號!至4之半時槽的單一層發送。 如針對每個OFDM符號(例如OFDM符號1)所說明,單一層 空間前導载頻調針對每19個資料载頻調重複並佔用一個載 頻調。對於180載頻調0FDM符號而言,將存在9個單一層 空間前導載頻調。明確而言,對於〇FDM符號1及〇]?1)]^符 號3,單一層空間前導載頻調係說明為從載頻調一處開始 並且每20個載頻調重複一次;並且對於〇fdm符號2及 OFDM符號4,單-層空間前導載頻調係說明為開始於載頻 調十一處而在中間偏務於鄰近符號並且每2 〇個载頻調重複 一次。因此,對於單一層發送而言,用於支援單一層空間 如導載頻調的頻寬附加項係每OFDM符號的二十分之一或 百分之五。在一鄰近〇FDM符號(例如〇FDM符號2)中,單 一層空間前導載頻調偏移於鄰近符號的單一層空間前導载 頻調。還應注意,一個〇FDM符號可以針對額外頻道特徵 來利用一鄰近OFDM符號之單一層空間前導載頻調之偏移 位置而不依賴於額外專用空間前導載頻調。 圖7B說明橫跨OFDM符號1至4之半時槽的兩層或雙層發 送。如針對每個OFDM符號(例如OFDM符號1)所說明,第 一層空間前導載頻調針對每19個資料載頻調重複並佔用_ 個載頻調,而且第二層空間前導載頻調偏移於第一層空間 118977.doc 15 200803260
前導載頻調並且亦針對每19個資料載頻調重複並佔用一個 載頻調。對於18〇載頻調0聰符號而言,將存在18個第一 層及第一層工間4導载頻調。明確而言,對於〇FDM符號! 及OFDM符號3 ’第-層及第二層空間前導载頻調係說明為 從载頻調-處P4始並且每職載頻調重複—次;而且對於 卿Μ符|虎2及〇聰符號4,第—層及第二層空間前導載 頻調係說明為開始於載頻調十—處而在中間偏移於鄰近符 ,並且每Η)個載頻調重複—次。因此,對於兩層發送而 。用於支援f !及第二層空間前導載頻調的頻寬附加 項係每OFDM符號的十分之一或百分之十。 圖7C說明橫跨0FDM符號⑴之半時槽的三層發送。如 對於每個OFDM符號所說明,第一層空間前導载頻調針對 每29個資料載頻調重複並佔用—個㈣調,第二層空間前 導载頻調針對每29個資料载頻調重複並佔用一個載頻調, 以及第三層空間前導載頻調針對每29個資料載頻調重複並 間前導載頻調。因對於三層發送而言,用於支援第— 層、第二層及第三層空間前導載頻調的頻寬附加項係每 OFDM符號的十分之一或百分之十。 :占用:個載頻調。第一層、第二層及第三層空間前導載頻 凋係化OFDM付號1至4而交錯並重複,使得第一層、第二 層及第三層空間前導载頻調每1〇個載頻調重複一次並且針 對母9個貧料載頻調.佔用一個载頻調。對於1肋載頻調 OFDM符號而言,將存在18個第—層、第二層及第三層空 圖7D說明橫跨〇FDM符號丨至4之半時槽的四層發送。如 118977.doc -16- 200803260 對於每^職符號所說明,第—層空間前導載頻調針對 每19個貝料载頻6周重複並佔用一個載頻調,第二層空間前 ㈣頻調針對每19個轉_财複並佔用―個载頻調, 第三層空間前導載頻調針對每19個資料载頻調重複並佔用 • —個載㈣’以及第四層空間前導載頻調針對每19個資料 . «員調重複並佔用一個載頻調。第一層、第二層、第三層 =第四,空間前導载頻調係沿〇脑符號[至彳而交錯並重 •,以便第—層、第二層、第三層及第四層空間前導载頻調 每5個载頻調重複一次並且針對每彳個資料载頻調佔用一個 載頻調。對於180載頻調〇FDM符號而言,將存㈣個第一 層第一、第二層及第四層空間前導載頻調。因此,對於 四層㈣而言,用於支援第一層、第二層、第三層及第四 層空間前導载頻調的頻寬附加項係每OFDM符號的五分之 一或百分之二十。 因為在不同符號週期中於p個前導副頻帶之不同集合上 馨 t送各層空間前導載頻調,所以此交錯式前導方案使 ΜΙΜΟ接收器可獲得對超過其特定副頻帶的前導觀察而不 增加任一個符號週期中用於前導發送的副頻帶之數目。對 於所有厨導發送方案而言,ΜΙΜ〇接收器可根據其接收符 - 唬並使用各種頻道估計技術來得到頻道之頻率回應估計。 圖8顯不接取點11〇處7又空間處理器83〇及發射器單元 832之一具體實施例的方塊圖。τχ空間處理器83〇包含前 導產生器910、資料空間處理器920以及用於τ個發射天線 的Τ個多工器(Mux)93〇a至930t。 HS977.doc -17- 200803260 前導產生器910產生用於ΜΙΜΟ終端機的T個合成前導。 依據以上說明的空間層發送來產生用於副頻帶的合成空間 前導載頻調。 資料空間處理器920從ΤΧ資料處理器820接收資料符號 並對此等資料符號執行空間處理。例如,資斜空間處理器 920可將資料符號解多工成用於Τ個發射天線的Τ個子串 流。根據系統設計,資料空間處理器920可以或可以不對 此等子串流執行額外空間處理。每個多工器930從資料空 間處理器920接收個別資料符號子串流及用於其相關聯的 發射天線之發送符號,採用發送符號來多工資料符號,以 及提供輸出符號流。 每個發射器單元832接收並處理一個別輸出符號流。採 用每値發射器單元832,IFFT單元942可使用Κ點IFFT將用 於Κ個總副頻帶的Κ個輸出符號之每個集合轉化成時域, 並提供包含Κ個時域碼片的一轉化的符號。循環前置產生 器944重複每個轉化的符號之一部分以形成包含K+C個碼 片的一 OFDM符號,其中C係重複的碼片之數目。重複的 部分係稱為循環前置並係用於抵抗無線頻道中的延遲展 開。TX射頻(RF)單元946將OFDM符號流轉換成一或多個 類比信號並進一步放大、濾波及升頻轉換該(等)類比信號 以產生一調變的信號,其係從一相關聯天線834發射。循 環前置產生器944及7或TX RF單元946亦可提供用於其發射 天線的循環延遲。 圖9顯示多天線OFDM系統中的ΜΙΜΟ終端機120b之方塊 118977.doc -18- 200803260 圖。在ΜΙΜΟ終端機120b中,R個天線852a至852r接收T個 調變的信號,並且每個天線852提供一接收的信號給一個 別接收器單元854。每個接收器單元854對藉由發射器單元 執行的處理執行補充處理並提供(1)接收的資料符號給一 RX空間處理器860y以及(2)接收的前導符號給一控制器 880y内的一頻道估計器884y。頻道估計器884y對ΜΙΜΟ接 收器執行頻道估計並提供一 ΜΙΜΟ頻道響應估計。RX空間 處理器860y採用ΜΙΜΟ頻道響應估計對來自R個接收器單 元854a至854r之R個接收的’資料符號流執行空間處理並提 供偵測的符號。一 RX資料處理器870y符號解映射、解交 錯並解碼所偵測的符號而且提供解碼的資料。控制器880y 控制ΜΙΜΟ終端機120b中的各處理單元之運作並且記憶體 單元882y儲存由控制器880y使用的資料及/或程式碼。 熟習此項技術人士將瞭解,可使用任何各種不同技術與 技巧來表示資訊及信號。例如,以上整個說明中可能參考 的資料、指令、命令、資訊、信號、位元、符號及碼片可 由電壓、電流、電磁波、磁場或磁粒子、光場或光粒子或 其任何組合加以表示。 熟習技術人士將進一步瞭解,本文結合本發明所說明的 各種說明性邏輯區塊、模組、電路及演算法步驟可加以實 施為電子硬體、電腦軟體或兩者的組合。為清楚說明硬體 及軟體之此可互換性,以上一般根據其功能而說明各種說 明性組件、區塊、模組、電路及步驟。此類功能係實施為 硬體或軟體取決於特定應用及對總體系統所施加的設計約 118977.doc -19- 200803260 波束。熟習技術人士可對每個特定應用採用各種方式來實 施所說明的功能,但此類實施決策不應該解釋為引起與本 發明之範疇的脫離。 本文結合本發明說明的各種說明性邏輯區塊、模组及電 路可採用通用處理器、數位信號處理器(Dsp)、特定應用 積«路⑽⑹、場可程式化閘極陣列(fpga)或其他可程 ,人U離放閘極或電晶體邏輯、離散硬體組件或 =用於執行本文說明的功能之任何上述元件組合來加以 或執行。通用處理器可以係微處理器,但在替代性具 體貫施例中,處理器可以係任一傳統處理器、控制器、微 控制器或狀態機一處理器亦可實施為計算器件之—且 t例如’一Dsp與—微處理器之一組合、複數個微處理 i組= — DSP核心的—或多個微處理器、或任何其他此 文、”本叙明說明的方法或演算法之步驟可以直接在 且:化由處理器執行的軟體模組、或該二者之組合中加以 職“。軟體模組可駐存於RAM記憶體、快閃記憶體、 料 、EPR0_憶體、EEPR0M記憶體、暫存器、 形式或該技術中已知的任何其他 便處理时子媒體中。將—示範性儲存媒體輕合至處理器以 媒體中"可以從該儲存媒體讀取資訊並將資訊寫入該錄存 人。—在替代性具體實施例中,儲存媒體可與處理器整 於一二里益與儲存媒體可駐存於—ASIC中。ASIC可駐存 者、、端機中。在替代性具體實施例中’處理器與 118977.doc -20- 200803260 儲存媒體可駐存為一使用者終端機中的離散組件。 a提供本揭示内容之先前說明以使熟習此項技術人士能實 施或使用本揭示内容。熟習此項技術人士將輕易地明白二 本揭不内容的各種修改,並且本文定義的一般原理可應用 於其他變化而不脫離本揭示內容之精神或範疇。因此,本 揭示内容並非意欲限於本文說明的範例,而係符合與本文 揭示的原理及新穎特徵一致的最大範疇。 【圖式簡單說明】 圖1顯示高速率封包資料(HRi>D)通信系統。 圖2顯示支援CDM的單一載波時槽結構。 圖3顯示支援0FDm的單一載波時槽結構。 圖4顯示高速率封包實料(HRPD)通信系統中的發射器與 接收器之方塊圖。 圖5顯示支援遺留與非遺留頻道上的〇F]〇M之多載波時槽 結構。 圖6顯示用於支援ofdm之高速率封包資料(HRPD)通信 系統的副頻帶結構。 圖7A至7D顯示用於支援OFDM之高速率封包資料 (HRPD)通信系統的空間前導結構。 圖8顯示支援OFDM之高速率封包資料(HRPD)通信系統 中的發射器之方塊圖。 圖9顯示支援OFDM之高速率封包資料(HRPD)通信系統 中的接收器之方塊圖。 【主要元件符號說明】 118977.doc -21 - 200803260 100 多天線HRPD通信系統 110 接取點 112 前導產生器 120 終端機 120a MISO終端機 120 b ΜΙΜΟ終端機 130 系統控制器 200 、 300 單一載波時槽結構 400 多載波時槽結構 500 副頻帶結構 820 ΤΧ資料處理器 830 ΤΧ空間處理器 832a-832t 發射器單元 834a-834t 天線 852a-852r 天線 854a-854t 接收器單元 860y RX空間處理器 870y RX資料處理器 880y 控制器 882y 記憶體單元 884y 頻道估計器 910 前導產生器 920 資料空間處理器 930a-930t MUX(多卫器) 118977.doc -22- 200803260 942 IFFT單元 944 循環前置產生器 946 TX RF單元 I18977.doc -23- 200803260 十、申請專利範圍: 1. 一種在一無線通信系統中發送前導的方法,其包括: 產生用於一單一層發送的一第一層前導; 橫跨一第一 OFDM符號之副頻帶而重複該第一層前 導; 橫跨一鄰近第二OFDM符號之副頻帶以偏務於該第一 * OFDM符號之該第一層前導方式重複該第一層前導;以及 0 在該單一層發送中發送該等第一及第二OFDM符號。 2. 如請求項1之方法,其進一步包括: 產生用於一種兩層發送的一第二層前導; 橫跨一第一 OFDM符號之副頻帶以偏移於該第一層前 導方式重複該第二層前導; 橫跨一鄰近第二OFDM符號之副頻帶以偏移於該第一 OFDM符號之該第二層前導方式重複該第二層前導;以及 在該兩層發送中發送該等第一及第二OFDM符號。 φ 3.如請求項2之方法,其進一步包括: 產生用於一種三層發送的一第三層前導; 橫跨一第一 OFDM符號之副頻帶以偏移於該等第一及 . 第二層前導方式重複該第三層前導; 橫跨一鄰近第二OFDM符號之副頻帶以偏移於該第一 OFDM符號之該第三層前導方式重複該第三層前導;以及 在該三層發送中發送該等第一及第二OFDM符號。 4.如請求項3之方法,其進一步包括: 產生用於一種四層發送的一第四層前導; 118977.doc
Claims (1)
- 200803260 k跨〜第一 〇FDM符號之副頻帶以偏移於該等第— 層第〜層及第三層前導方式重複該第四層前導; 換跨〜鄰近第二〇FD]VI符號之副頻帶以偏移於該第一 OFDM符號之該第四層前導方式重複該第四層前導;以及 在4四層發送中發送該等第一及第二〇FDm符號。 5·如明求項2之方法,其中橫跨該等第一及第二OFDM符妒 於相同副頻帶中交替地置放該等第一及第二層前導。心 6.如清求項3之方法,其中橫跨該第一〇FDM符號、該第一 〇FDM符號及一鄰近於該第一 OFDM符號與該第二QFDm 符號中之至少一者的第三〇FDM#號於相同副頻帶中六 替地置放該等第一、第二及第三層前導。 ^ 7·如請求項6之方法,其中橫跨該第一 〇FDM符號、診第 OFDM付號、該弟二OFDM符號及一鄰近於該等第一 二及第三OFDM符號中之至少一者的第四〇Fd 第 m 付就於相 同副頻帶中交替地置放該等第一、第二、望3 罘二及第四層 丽導。 曰 8·如請求項1之方法,其中該第一層前導佔用該等第 第二OFDM符號之每一者之該等副頻帶的接 及 五。 、百分之 9.如請求項2之方法,其中該等第一及第二層前導佔 等第一及第二OFDM符號之每一者之該等副用該 肩咿的接诉 百分之十。 t 10·如請求項3之方法,其中該等第一、第二 — 佔用該等第一及第二OFDM符號之每一者之 V μ寻副頻帶 118977.doc * 2 · 200803260 的接近百分之十。 11 ·如請求項4之方法,甘 其中該等第一、第二、第三及第四 層W導佔用該等窠—K ^ 寻弟 及弟二OFDM符號之每一者之該等 副頻帶的接近百分之二 12· 一種一無線通信系統中的裝置,其包括:則導產生器’其可運作以根據若干發送層來產生至 ^ 一個則導,該至少一個前導之每一者係橫跨一第一 OFDM符號之副步員冑而重複並且係&一步冑跨一鄰近第 一 OFDM符號之副頻帶以偏移於該第一 〇fdm符號之該至 少一個前導之其他者方式而重複;以及 複數個發射器單元,其可運作以經由複數個發射天線 在個別數目之層發送中發送該等第一及第二〇FDM符號 之每一者。 13·如凊求項12之裝置,其中該至少一個前導包含用於一單 層發送的一第一層前導並且其中該第一層前導係橫跨 該等第一及第二OFDM符號之副頻帶而偏移。 14·如請求項12之裝置,其中該至少一個前導包含用於一種 兩層發送的一第一層前導及一第二層前導,並且其中該 等第一及第二層前導係橫跨該等第一及第二OFDM符號 之副頻帶而偏移。 15·如請求項12之裝置,其中該至少一個前導包含用於一種 三層發送的一第一層前導、一第二層前導以及一第三層 前導,並且其中該等第一、第二及第三層前導係橫跨該 等第一及第二OFDM符號之副頻帶而偏移。 118977.doc 200803260 月求項12之裝置,其中該至少一個前導包含用於一種 四層:送的-第一層前導、一第二層前導、一第三層以 及弟四層可導,並且其中該等第一、第二、第三及第 四層前導係樺跨兮望# 八5 4專弟一及第二〇fdm符號之副頻帶而 偏移。 。月求項14之裝置’其中橫跨該等第-及第二OFDM符 號於相同副頻帶中交替地置放該等第-及第二層前導。 —月求項15之裝置,其中橫跨該第- OFDM符號、該第 一OFDM符號及一鄰近於該第—㈣%符號與該第二 们虎中之至少一者的第三〇FDM符號於相同副頻帶 中交替地置放該等第一、第二及第三層前導。 月求項16之裝置,其中橫跨該第一 OFDM符號、該第 :OFDM持號、該第三_Μ符號及一鄰近於該等第一、 弟-及第三〇FDM符號中之至少一者的第四購_號於 相同副頻帶中交替地置放該等第一、第二、第四 層前導。 2〇·=請求項13之裝置,其中該第-層前導佔用該等第一及 第OFDM符號之每一者之該等副頻帶的接近百分之 五。 21. :: 士項=之裝置,其中該等第一及第二層前導佔用該 等第及第_ 〇FDM符號之每—者之該等副頻帶的接近 百分之十。 22. 如請求項15之裳置,其中該等第一、第二及第三層前導 佔用該等第-及第二_符號之每一者之該等副頻帶 I18977.doc 200803260 的接近百分之十。 23·如請求項J μ ^ " ,/、中該等第一、第二、第三及第四 層則‘佔用兮莖楚 ^ 用4 4弟一及弟二0FDM符號每一 .副頻帶的接近百分之二十。 母者… 24. 一種-無線通信系統中的裝置,其包括: 、,f生構件,其用於產生用於一單一層發送的重後構件,其用於橫跨一第一0FDM符號之副頻帶而 重複該第一層前導; 重複構件’其用於橫跨一鄰近第二0FDM符號之副頻 帶=偏移於該第—⑽⑽號之該第—層前導方式重複 該第一層前導;以及 發达構件,其用於在該單一層發送中發送該等第一及 第二OFDM符號。 25.如請求項24之裝置,其進一步包括; 產生構件,其用於產生用於一種兩層發送的一第二層 前導; " 重複構件,其用於橫跨一第一 0FDM符號之副頻帶以 偏移於該第一層前導方式重複該第二層前導; 重複構件,其用於橫跨一鄭近第二〇FDM符號之副頻 帶以偏移於該第一 OFDM符號之該第二層前導方式重複 該第二層前導;以及 發送構件,其用於在該兩層發送中發送該等第一及第 二OFDM符號。 llS977.doc 200803260 26.如請求項25之裝置,其進一步包括: 產生構件,其用於產生用於一種三層發送的_第三声 前導; _ θ 重複構件,其用於橫跨一第一 〇fdm符號之副頻帶以 偏移於該等第一層及第二層前導方式重複該第三層前 導; 日 册重稷構件,其用於橫跨一鄰近第二〇fdm符號之副頻 帶以偏移於該第一 0FDM符號之該第三層前 該第三層前導;以及 次重複 發送構件,其用於在該三層發送中發送該等第一及第 二OFDM符號。 27·如請求項26之裝置,其進一步包括: 產生構件,其用於產生用於一種四層發送的一第四層 前導; 曰 重複構件,其用於橫跨一第一 OFDM符號之副頻帶以 偏移於該等第一層、第二層及第三層前導方式重複該第 四層前導; 重複構件,其用於橫跨一鄰近第二OFDM符號之副頻 帶以偏移於該第一 0FDM|號之該第四層前導方式重複 該第四層前導;以及 發运構件,其用於在該四層發送中發送該等第一及第 二OFDM符號。 28.種執行一無線通信系統中的頻道估計之方法,盆包 括: ’、 118977.doc 200803260 一:由複數個接收天線獲得接收的符號,每_符號包含 a一第一層前導,其中該等接收的符號之鄰近者包含在該 等副頻帶中彼此偏移的該第一層前導;以及 根據第-層前導來處理該等接收的符號,以獲得複數 * 個發射天線與該魏個接收天線之間的錢個頻道之估 計。 29.如請求項28之方法,其進一步包括: 籲 、經由複數個接收天線獲得接收的符號,每一符號進一 步包含-第二層前導,其中該等接收的符號之鄰近者包 合在該等副頻帶中彼此偏移的該第二層前導;以及 根據該等第-及第二層前導來處理該等接收的符號, 以獲得該複數個發射天線與耗數個純請之間的複 數個頻道之估計。 30.如請求項Μ之方法,其進一步包括: 、經由複數個接收天線獲得接收的符號,每-符號進一 •步包含—第三層前導,其中該等接收的符號之鄰近者包 含在該等副頻帶中彼此偏移的該第三層前導;以及 根據該等第-、第二及第三層前導來處理該等接收的 付ί獲得該複數個發射天線與該複數個接收天線之 間的複數個頻道之估計。 31·如請求項30之方法,其進一步包括: 經由複數個接收天線獲得接收的符號,每一符號進一 步包含一第四層前導,豆中诗隹 ^ ,、中該專接收的符號之鄰近者包 含在該等副頻帶中彼此偏移的該第四層前導;以及 118977.doc 200803260 根據該等第一線之間的複數個頻道之估計。 第二及第四層前導來處理該 一種一無線通信系統中的裝置,其包括: 其包括:該等接收的符號以獲得該複數個發射 天線與該複數個接 收天線之間的複數個頻道之估計。 33.如料項以裝置,其中該等接㈣符號分別進一步包 含-第二層前導,該等接收的符號之鄰近者包含在該等 ^頻帶中彼此偏移的該第二層前導,並且其中處理該等 第一及第二層前導,以獲得複數個發射天線與複數個接 收天線之間的複數個頻道之估計。 34· 求項33之裝置,其中該等接收的符號分別進一步包 含-第三層前導,該等接收的符號之鄰近者包含在該等 田〗頻V中彼此偏移的該第三層前導,並且其中處理該等 弟:、第二及第三層前導,以獲得該複數個發射天線與 該複數個接收天線之間的複數個頻道之估計。 如明求項34之裝置,其中該等接收的符號分別進_步包 含一第四層前導,該等接收的符號之鄰近者包含在該等 =頻帶中彼此偏移的該第四層前導,並且其中處理該等 第、第二、第三及第四層前導,以獲得該複數俩發射 天線與該複數個接收天線之間的複數個頻道之估計。 HS977.doc
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