TWI324862B - Coded mimo systems with selective channel inversion applied per eigenmode - Google Patents
Coded mimo systems with selective channel inversion applied per eigenmode Download PDFInfo
- Publication number
- TWI324862B TWI324862B TW092123617A TW92123617A TWI324862B TW I324862 B TWI324862 B TW I324862B TW 092123617 A TW092123617 A TW 092123617A TW 92123617 A TW92123617 A TW 92123617A TW I324862 B TWI324862 B TW I324862B
- Authority
- TW
- Taiwan
- Prior art keywords
- group
- channel
- transmission
- channels
- power
- Prior art date
Links
Classifications
-
- 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
- H04W52/30—TPC using constraints in the total amount of available transmission power
- H04W52/34—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
- H04W52/346—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading distributing total power among users or channels
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/005—Control of transmission; Equalising
-
- 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
- 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
- H04L1/0009—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
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0041—Arrangements at the transmitter end
-
- 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
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0067—Rate matching
- H04L1/0068—Rate matching by puncturing
-
- 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
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0071—Use of interleaving
-
- 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
- H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
- H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
-
- 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
- H04B7/0426—Power distribution
- H04B7/0434—Power distribution using multiple eigenmodes
- H04B7/0439—Power distribution using multiple eigenmodes utilizing channel inversion
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Quality & Reliability (AREA)
- Mobile Radio Communication Systems (AREA)
- Radio Transmission System (AREA)
Description
1324862 玖、發明說明: 【發明所屬之技術領域】 本發明一般係關於資料通信,更明確言之,係關於在每 一特徵模式上實施多重輸出多重輸入系統之可選擇頻道 轉換之技術。 【先前技術】 多重輸出多重輸入(multiPle_inputmultiPle_outPut ; MIM0)通 信系統使用多重(Ντ)發射天線與多重(Nr)接收天線來傳送 資料。由Ντ個發射與Nr接收天線形成的多重輸出多重輸入 頻道可分解為Ns個揭立頻道’且< min {NT, NR},各 Ns個獨立頻道亦矸稱為空間子頻道或多重輸出多重輸入 頻道的特徵模式" 由於諸如衰減與多路徑之類的不同因素’寬頻多重輸出 多重輸入系統的空間子頻道可面臨不同的頻道條件。各空 間子頻道可因此經應頻率可選擇衰減’其特徵係總系統頻 寬的不同頻率的頻道增益不同°假設不存在功率控制’則 這會導致各空間子頻道之不同頻率的不同信號對雜訊及 干擾比(signal-to-noise-and-interference ratios ; SNR) ’ 其能支援 特定性能位準的不同資料率(例如1 %的封包錯誤率)。 為克服寬頻頻道中的頻率可選擇衰減,可使用正交頻分 多工(orthogonal frequency division multiplexing ; OFDM)技術來 有效地將總系統頻寬分割為數個(NF)子帶,其亦稱為頻率 檔或子頻道。採用OFDM,則各子帶與資料可在其上調變 的個別子載波相關聯。就使用OFDM(即一 MIMO-OFDM系統) 87638-990106.doc -6- UZ4咖 的多重輸出多重輸入系統而t,各空間子頻道的各子帶可 視為一獨立傳送頻道。 編碼通信系統的一主要挑戰係依據頻道條件選取適當 肓料率以及用於資料傳送的編碼與調變方案。該系統的主 要目標係將頻譜效率最大化,同時減少發射器與接收器的 複雜性。 一選取資料率及編碼與調變 方案的直接技術係依據 傳送容量在系統中 該技術具有數個主要缺陷 位元負载(bit load)」各傳送頻道。 其 但 首先’針對各傳送頻道單獨編 I與調變會大幅增加發射器與接收器處理的複雜性。其 人針對各傳送頻道單獨編碼會大幅增加編碼與解碼之延 因此’本技術要—種無需針對各料頻道單獨編碼 即可在多重輪出多重輸入系統中獲得高頻譜效率之技術。 【發明内容】 此處提供之技術可在多重輸出多重輸入系統中每一特 =模式上實施可選擇頻道轉換,以獲得較高㈣效率,同 成2發射器與接收器的複雜性。將可用的傳送頻道配置 trt,其中各群組可包括所有多重輸^重輸入頻 ί案“广拉式之傳送頻道(或頻率檔)。使用特定功率配置 -傳二如:勾的功率配置、填水法(water-filling)等等)將 的各群组㈣傳送 傳送功率)。就各群組而言選用用已配置 k用忒群組中一或多個傳送頻 87638-990J06.doc 1324862 道’並決定各選用頻道的縮放因數,以便轉換該組所有選 用的頻道,並獲得類似的已接收信號品質(即已接收的 SNR) 〇 在以下進一步詳細說明本發明的各個方面及具體實施 例。如以下所詳述,本發明進一步提供實施本發明之各方 面、具體實施例及特徵的方法、程式碼、數位信號處理器 發射器單元、接收器單元及其它設備與元件。 【實施方式】 在一多重輸出多重輪入通信系統中,例如一多天線無線 通信系統,從NT個發射天線發射的資料流在接收器處相互 連接。克服該干擾的-項技術係❹线出多$輸入頻道 「對角化」’以獲得數個獨立頻道。 多重輸出多重輸入系統的模型可表述如下: 江 式⑴ 其中,X為具有Nr個項的向量,{yj}lMe{1,…,Nr},即仏 個接收天線接收到的符號(即「接收到的」向量” 2L為具有NT個項的向量,{xj}t|7je{i,.,NT},即從 N丁個發射天線發射出的符號(即「已發射的」向 量); 廷為(Nr ΧΝΤ)頻道回應矩陣,其包括從Ντ個發射天線 R個接收天線的轉移函數(即複數增益);以及 a為具有—平均值向”以及—協變異數矩陣 的附加白问斯雜訊(add出ve white Gaussian noise ; awgn) ’其中辽為所有零的向量,i為單位矩陣, 87638-990I06.doc -8- &著對角線的值都是丨,其他地方為ο,而為雜 訊變異數。 .出於簡化之目的,假設-平坦衰減的窄頻頻道。在此情 頻心回應可用整個系統頻寬的一常數複數值表示, 且頻道回應矩陣过的元素為純量。儘管出於簡化之目的, 此處作出了頻率非可選擇之假設’此處所述之技術可延伸 用於頻率可選擇頻道。 ,C回應矩陣过可藉由在相關矩陣达上實施特徵值分 解民ϋ ϋ進仃對角化。相關矩陣R的特徵值分解 可表述為: R = edeh 式(2) 其“為―(NtxNt)單位矩陣,其各行為民的特徵向量 ^{1,...,NT}; -為一(ΝτχΝτ)對角矩陣,其對角線上的項與R的特 徵值對應;以及 就任何矩陣Μ而言,mh表示M的共輛轉置。 單位矩陣由特性运^表示。 在技術中已知,亦可使用奇異值分解(Singular value decomposition ’· SVD)來實施特徵值分解。 對角矩陣砂著對角線包括非負實值,其他地方為零。 該等對角項稱為矩陣民的特徵值,並可表示多重輸出多重 輸入頻道的獨立頻道之功率增益…具有Ντ個發射與〜 個接收天線的多重輸出多重輪人系統的獨立頻道之數量 即為κ的非零特徵值之數量’Ns_<min{NT,NR}。該等非零特 87638-990106.doc -9- 1^24862 徵值由{1}表示,i = (l,...,Ns}。 若不考慮Ντ個發射天線的功率限制,則多重輪出多重輸 入頻道可對角化,方式為將「資料」向量泛與單位矩陣邑預 先相乘(或「預調節」),以獲得已發射的向量圣。發射器的 預調節可表述如下: ^ 式(3) 在接收器處,可將已接收向量叉可與互H^H預乘(或「調 節」)’以獲彳于資料向量反的估計值。用於獲得資料向量估 計值£的調節可表述如下: s = E ^ Η ^ ^ 式⑷ =HEs. +Εη Ηη η =Ds+ η 其中’ 1為具有平均向量么與協變異數矩陣m2㈣ AWGN 〇 如式⑷所*,發射器的預調節以及接收器的調節會引起 資料向量由—以矩較表示的有效頻道回應轉換,以及雜 訊元素的縮放。由於辽為對角矩陣,因此具有有效的…個 非干擾平行頻道。各個此等頻道具有—與對應特徵值的平 方扣2相等的功率增益’以及等於山丨的雜訊功率, ,產生―信號對雜訊比"σ2。因此,各個此等 頻道的功率增益等於特徵值Ai,U{i,..,Ns}。平行頻道靖 常稱為特徵模式i或模式ie可獲得如式(3)與⑷所示的多重 87638-990106.doc -10- 1324862 輸出多重輸入頻道的對角化,若發射器具有頻道回應 Η或等效資訊。· f 上述特徵值分解亦可實施於寬頻、頻何選擇 職〇·0膽系統而言,寬頻頻道可分㈣平坦衰減、正 交頻率檔或子帶。可猫Λ 了獨立貫訑各頻率檔k的頻 H(k)的特徵值分解,以.金M 7 怨矩陣 解^疋N s空間子頻道或頻率槽的特徵 才吴式。各頻率檔的I办ρι 的谷工間子頻道亦可稱為「傳送」頻道。 MIMO-OFDM系統的模型表述如下: #)=姻柳+ _),其令ke{1, ,Nf} 式⑺ 其中"(k)"表示第k個頻率檔。 各頻率檔的相關矩陣刚之特徵值分解可表述如下:
Kk) = E(k)D(k)EH(k). 民㈨的非零特徵值表示為“㈣,卜{ι二(6) ^ΓΝρ}〇 ? , 頻率檔的特徵模式分解會引起…個空間子頻道或. 檔的特徵模式,或總*NsNf個傳送頻道。 ’、… 特徵值可有兩種形式:—「排戽 开”…4 排序」形式與-「隨機順序」 ,在排序形式中,各頻率檔的…個特徵值,以 序’以使⑷叫脉···⑽k)},其中Ai(k)為頻率槽k 的最大特徵值,而ANS(k)為頻率獻的最小特徵值 順序形式中,特徵值的順序可以係隨機的,並進一=機 於頻率。如下所述,所選用的特定形式,不管是排:二 或隨機順序形式’都會影響用於資料傳送的特徵模式二 以及用於各選取特徵模式的編碼與調變方案。 、擇 87638-9901〇6.d,
0C -11 丄 JZHOUZr _ IMO-OFDM系統之特徵值分解的曲線圖。 如圖所示,對角矩車隹 車其中k={l,.._,NF},沿著表示 頻率維度的軸u 〇按 筏项序配置。各矩陣以k)的特徵值 { A(k)},其中 】 σ 1,·..,Νδ},位於矩陣的對角線上。因此軸 視作表不空間維度。所有頻率槽的特徵模式i(或簡單 。特徵拉式0與—元素集相關聯{ a侧,其中 頻率回應。各特徵模彳 __ _ 杈式的义素集^(k)}由沿著虛線114的 框表不。圖i中各 率可選柽奈、“ 傳送頻道。就各經歷頻 k值不同時,會有所^其元素(娜徵模式當 二的特徵值按遞減順序排序,則特徵模 川厂在久 要特徵模式)會包括最大的特徵值, l(k),在各矩陣中,
Wk),在各矩陣中β 4式乂會包括最小的特徵值, =IM〇-OFDM系統中各頻率檔 頻寬上nsnf個傳逆噸# Μ ^ 又值刀解曰与丨起整個 可獲得不同sj並頻可道::同^ n /、不同傳送谷量相關聯。可使用不 同功率配置方案值.、,+ A 聊J便用不 (次傳迗方案)將總傳 送頻道,以獲得較高的總體頻譜效率/刀佈至以傳 tk (bps/Hz^ ^ - 9率,其以位元/秒每一赭 方案。 將進—步詳細說明其中某呰 1.填水法 在發射器的總傳送功 午K於ptotaI的限制下,「填水法 87638-990106.doc -12- (•water-f山lng)J或r倒水法(waterp〇ur—)j方案可用於 橫跨傳送頻道最佳地分佈總傳送功率,以將總頻譜效率最 大化。填水法㈣在啊個傳送頻道上分佈功率以使具 有越來越高SNR的頻道接收到總傳送功率越來越大的部 =。配置至既定傳送頻道的傳送功率係由該頻道的隨決 疋,其可既定為Α(1〇/σ2,其中七(1〇為第让個頻率檔中的第 i個特徵值。 本技術中已知貝&填水法之過程,此處不再說明。填水 法之結果為向各NsNf個傳送頻道的特定傳送功率配置,其 由卩从)表不’卜〇,,Nj以及k=p,Μ。實施功率配置 以滿足以下條件:
Pt〇tal=S§P|(k) 式(7) 其中 L={1,...,NS} ’ k={1,...,Nf}。 依據配置的傳送功率Pi(k) ,i={1, ,Ns}以及 k={l,…,NF},各傳送頻道的已接收SNR,Mk),可表述如 下: Μ) 一^其中 以及 k={l,.._,NF}.式(8) 可依據容量的持續單調增加的對數函數,計算NsNf個傳 送頻道的總頻譜效率c,表述如下: 式⑼ 87638-990106.doc -13-
^*t〇UZ —在一典型通信系統中,預計能觀察到的已接收SNR的總 圍可刀割為數個子範圍。各子範圍隨後可與特定編碼及 調變方索相關聯,選取該方案以產生既定位元錯誤率(bit eiT〇r 如6 ; BER)、訊框錯誤率(frame error rate ; FER)、或 封包錯誤率(packet err〇r rate ; pER)的最高頻譜效率。填水 法力率配置會引起各NsNp個傳送頻道不同的已接收 NR這會引起針對傳送頻道使用許多不同編碼/調變方 案。母個傳送頻道會的編碼/調變增加總頻譜效率,代價就 是發射器與接收器更大的複雜性。 、 2.廛_屋_^·所有傳谈頻道的可谐擇頻道轉埴 所有頻道SCI」方案在所有傳送頻道上實施可選擇頻 道轉換(SCI),以使選用的頻道可獲得約等於接收器已接收 的SNR。這就實現了針對所有選取的傳送頻道使用—共同 編碼,調變方案。與填水法方案相比,該方案大大減少了 發射盗與接收器的複雜性。藉由首先選取所有或只選取一 子集的用於資料傳送的可用傳送頻道,可獲得已接 收SNR的等化。頻道選取會弓丨起SNR較低的較弱頻道的消 除。總傳送功率Pt(Jtal則橫跨選取的傳送頻道分佈,方式為, 已接收的SNR對於所有選取的傳送頻道約相等。 若「滿」頻道轉換為所有NsNf可用傳送頻道實施,則總 傳达功率Ptotal可g己f ’以便所有頻道都能接收到大致相等 的仏號功率。配置至頻率檔k的特徵模式丨的適當傳送功率 Pi(k)量可表述如下·· 式(10) 乂, W, 87638-990106.doc -14 - 1^24862 其中《為-正規化因數,用於在可用傳送頻道中分佈總傳 送功率。正規化因數α可表述如下: a =--!__ ΣΣλ^γ1' 式(ιι)
/eZ, k^K 。正規化因數α能確保所有傳送頻道大致相等的已接收信 戒功率,其既定為aPtDtal。總傳送功率即有效分佈(不均勾 地)在所有可用傳送頻道上,依據其頻道功率增益,其由特 徵值Kk)決定。 若實施「可選擇頻道棘榼丨 悍」艿遏轉換則只有已接收功率位於或 大於特定限定值㈣總已接收功率相關)的傳送頻道 取用於資料傳送。而已接收功率低於該限定值的傳送頻道 則放棄或不再❹。就各選取的傳送頻道而言,可按^ 方法決定將配置給頻道的傳送功率,以使所有選取的傳送 頻道都能在大致相等的功率位準接收到。可選取限 以將頻譜效率最大化’或依據某些其他標準。 ^吏用的傳送頻道的選取可如下實施。最初,平均功率择 -pavg為所有可用傳送頻道計算,其可表述如下: 曰 Ρανε~~^Γ篇喻 式(12) 配置至各傳送頻道的傳送功率可表述如下: ,否則, 0 式(13) 其中傭定值,4一正規化因數,其與式⑴)中的 87638-990106.doc •15- 1324862 似。但正規化因數s只在選取的傳送頻道上計算,可表述 式(14) 5= Σ·-1· 限定值/?可如下導出(章節3.2)。 如式(13)所示,若一傳送頻道的特徵值(或頻道功率增益) 大於或等於功率限定值(即;,則選用該傳送頻 道。由於正規化因數α的計算只依據選取的傳送頻道,所 以總傳送功率PtQtal分佈至選取的傳送頻道,依據其頻道增 益,以使所有選取的傳送頻道具有大致相等的已接收功 率’其可表述為5*pt〇ta丨。 所有選取傳送頻道的已接收SNR的等化,因此可藉由換 傳送功率在該等頻道上的非均句分佈來獲得。大致相㈣ 已接收崎可實現所有選取的傳送頻道都使用單—資料率 和共同編碼/調變方案’這將大幅減少複雜性。 3 ·扁賴 「每-特徵模式SCI」方案能獨立實施各 選擇頻道轉換,以提供改進之性㈣式的可 NSNF個傳送頻、# + 項具體實施例中, 定特徵模個群組’以使各群組都包括-既 有nf頻率檔 F广即群組1包括特徵模式i的所 組。 4子頻道)。因此各特徵模式都有一個群 每一特徵模式SCI方 案包括兩個步驟 在第一步驟中, 87638-990106.doc -16- L傳送功率pt(Jtal依據一特定 個群组如也 群力率配置方案分佈至Ns 幻群組。在第二步驟中, 實施,群組的可選擇頻道轉換係獨立 …以將該群組的已配置傳 個頻藥@ 疋力羊刀佈至該群組中的Nf 调頻羊檔。以下將進一步詳 說明其中各步驟。 組的功率配罟 總傳送功率1>_可以不同方式分 明其中的部分方式。 su以下將說 在第—項具體實施财,總傳 * XT ^ L 吁疋刀半Ptota丨均勻分佈在所 有Ns_組上,以使其都配 均4的功率。配置至各群組 的傳送功率PG(i)可表述如 f
Pg(0 /total 式(15) 在弟二項具體實施例中 〜傳迗功率Puna丨依據橫跨所有 可用傳送頻道的填水法方荦分 兮目躺者 茶刀佈至乂群組。如上所述,就 ^具體Λ施例而言,總傳送功率 手Pt〇tal首先使用填水法方 茶为佈至所有nsnf個傳这锢、皆 办法 F调得送頻道。各傳送頻道都配置有
Pi(k),UU,...,Ns}以及k={1,,Νρ卜配置至各群組的傳送 功率則由配置至該群組中的Νρ個傳送頻道的傳送功率之 和決定。西己置至群組⑷傳送功率可表述如下: ⑽如λ其中ί…,...,Ns}· 式(i6) 在第三項具體實施例中’總傳送功率?㈣依據橫跨所有 群組的填水法方案,使用其平均頻道snr分佈至〜個群 組。最初’各群組的平均頻道SNR,由下式求得: 87638-990106.doc -17-
Ef r〇vgi}) nl ,其中 式(17) 隨後實施填水法,以俤仿缺廿T ^ M使依據其平均頻道SNR將總傳送功率
Ptotal 分佈在 NS 群组 。32 , A * 配置至各Ns個群組的傳送功率由 PG(i)表示’其中ie{1,…,Ν“。 在第四項具體貫施例中,y· Μ J T 在頻道轉換之後,依據橫跨所
有群組的填水法,传用U 便用傳迗頻道的已接收SNR將總傳送功 率Ptotal分佈至ΝΗϋ群纟且。钟—曰_ — ’、,且就該具體實施例而言,總傳送功 率Ptotal首先如上述式门- 飞所不,不均勻地分佈至Ns群組, 以便各群組都可配置到一, J初始傳运功率PG(i)=Pt〇ta丨/Ns,其 中ie{l’…,NS}。敁後在各群組上獨立實施可選擇頻道轉換, 以決定該群組中各頻率檔的一初始功率配置,邮),其中 k=U,...,NF^各頻率㈣已接收咖,⑽),隨後依據該 初始功率配置戶i(k)決定’如式⑻所*。各群組的平均已接 收SNRAvg(i)隨後計算如下: 式(18) 總傳送功率P_隨後使用填水法,依據其平均已接收 SNR hvg⑴(其中lS{l,...,Ns})分佈至Ns個群址。填水法功 率配置㈣果為NS群組修正後(即最終)的傳送功率配置 、g(),、中ie{l,..”Ns}。再次獨立實施各群組的可選擇頻 道轉換,㈣群組切頻率檔分佈料㈣已配置傳送功 率PG⑴。第二可選擇頻道轉換可向各頻率檔配置傳送功率 Pi(k)。 若⑴藉由填水法配置至群組的修正傳送功率大於該初 87638-990106.doc -18- 1324862 始平均功率配置(即p ()Pg(i))以及(2)該群組中所有頻率 槽在最初可選擇頻道轉換 得換都選用了,則無需實施既定群組 的第二可選擇頻道轉換。 兴就5哀具體情況而言,群組中的各 頻率檔的新功率配置pi(k)可表述如下: 式(19) eg細其中i e{1,…,nf}_ 可使用式(19) g]為⑴即使群組修正功率配置⑴高於初 始功率配置〜⑴,群組中的所有頻率擋已選用,且沒有額 外的頻率檔可選擇,以及(2),初始可選擇頻道轉換已決定 了群組中至頻率檔的功座夕.态$ 羊之適§配置’以獲得該等頻道的 大致相等的已接收SN^在所有其他情況下,再次實施各 群組的可選擇頻道轉換,以決定群財頻㈣㈣送功率 配置 Pi(k),其中ice{i,...,NF} 〇 3 _2應.用於各群組的可撰哼胳治竹於 一旦使用上述群組功率配置方案中的任何-個將總傳 送㈣傳送至Ns個群組,各乂群組的選擇㈣㈣係 獨立實施’並且在各群組内的化頻率檔上。各群组的可選 擇頻道轉換可如下實施。 ^(0 最初,各群組的平均功率增益pavg⑴由下式得出: (0ΐΙ·,其中i…,…為}- 式(20) 群組i中配置至頻率檔k的傳送功率可表述如下 total m)=\ ,义雜υ) ,否Μ, 式(21) 87638-990106.doc -19- 1324862 其中A為限定值,泛;為群組i的正規化 m A 因數。各群組的正規 化因數在該群組之選取的傳送頻道上計算,其可表述 為· a 幻-1 · 式(22) :(叫中的轉換頻道功率增益之和將群組i的所有選取頻 率檔的頻道功率增益都計算在内。 各群組中用於選取頻率播的限定值A可依據不同標準 設定,例如,用以最佳化頻譜效率。如下所述,在一項且 體實施例中,限定值①係依據頻道功率增益(或特徵旬設 定’而選取的頻率㈣頻譜效㈣依據各群組中橫跨頻率 擋的均勻傳送功率配置設定。 就該具體實施例而言,群組丨的限定值&的導出係如下得 到(其中各群組的衍生都是獨立實施)。最初,群組中所有 Nf頻率檔的特徵值都是按順序分級的,並置於一清單&(又) 中,其中^(i,...,Nf},按降序排列,使得&⑴=max(qk)) 以及 Gi(NF)=min{/li(k)},其中ie{1,,Ns}。 γ、各乂而。,其中,乂個最佳頻率槽的頻譜 ^率已汁,其中「最佳」指的係具有最高功率增益的頻 率檔,GiU卜可如下得到。首先,群組可用的總傳送功率, ⑴,使用下述功率配置方案中的任何一種,分佈至又個 最佳頻率檔。出於簡化之目的,使用均勻功率配置方案, 各2頻率檔的傳送功率為PG⑴/A。然後,各A頻率檔的已接 87638-990 ] 06.doc -20- 收SNR如下計算: 式(23) ,其中je{ 1,...,λ}· 群組最佳頻率檔 领〇文旱Ci“)可計算如下: λ C, (^) = ^^2 0 + ^0)), 式(24) 其中,P係一縮放因數,用於說 案中的無效。 、 選用的編碼與調變方 各續的頻譜效率CiU)都要計算其中 儲存在-陣列中。針對 ",·.·,且 r ^ 殒手檔的Nf個可能組合計曾 =NF個值後,將頻譜效率的陣列橫貫,且決定; :大值。對應於最大Ci_值,: =’其?,起評估頻道條件的最大頻譜效率,以= 均勻傳送功率配置。 吏用 由於群組i中nf頻率# &
Gi⑼中的,所以每選用^ 4 : ^降冪排列於清單 直至達到^ 1率檔時’頻譜效率會增加, 相最佳點,而此後頻譜效率會減少, 多的傳送功率會配署 ’··' ”·更 -置至更弱的頻率檔。因此,並不是計曾 所有可能a值的舛曾相吃4 * 疋。r开 f ·-頻瑨效率ckw,各^新值的 CiU)可與先前义值的 領B效羊 值的頻瑨效率CiQ-l)作比較。若達到最 頻4效率,則訃曾 取佳 十开會终止,其由CiUfCiU-i)表示。 限定值凡可表述為:
A AD 心0·) ’ 式(25) 87638-990J06.doc -21 - 1324862 其中Pavg(i)可按式(20)得到。 疋值/^亦可依據某些其他標準或某些其他功率配置 方案(而不是均勻配置)設定。 可選擇頻道轉換係進—步詳述於2001年5月17日申請之 美國專利申請序號09/86〇,274,與2001年6月14曰申請之序 號〇9/881,610與2〇〇1年6月26日申請之序號_92 379中, 上述三項申請案之標題均為「在多重頻道通信系統中使用 頻道轉換來處理資料之方法及設備」,其讓渡給本申請案 之受讓人且以提及方式在此併入。 各群組獨立實施可選擇頻道轉換會引起各群組中心頻 率檔的-群組傳送功率配置,Pi(k伽ke{l,·凡卜可選 擇頻道轉換會引起低於選用於任何既定群組的NF頻率檔。 非可選擇頻料不會配置到任㈣送功率(即就該等槽而 言,Pi(k)=〇)。選取的頻率標的功率如企匕配置可使該等鮮 得大致相等的已接收SNR。這就實現了在各群組中的料 選取頻率檔都可使用單1料率以及共⑽碼/調變方案。 就排序形式而言’各對角矩陣脉)的特徵值姻, 經過排序的,以使指數較小的對^素總體 較大。特徵值1則會—角矩陣中的最大特徵值相關 聯’特徵值2會與第:大特徵值相關聯等#。就排序形式 而言,儘管頻道轉換對各特徵模式的所有…個頻仲實 施,指數較低的特徵模式不太可能具有太多壞的頻率播田(如 果有的話),且過多的傳送功率不用於壞檔。 若填水法用於將總傳送功率分佈至乂特徵模式,則選用 87638-990106.doc -22- 丄 W4862 的特徵模式的數量會降低在較低的SNR。排序形式則因此 具有了優勢,在較低的SNR,編碼與調變會 的特徵模式的數量進一步簡化。 選用 就隨機順序形式而言,各對角矩陣£_特徵值為隨機 项序。&會引起所有特徵模式的平均已接收snr的較小變 化。在此情況下,少於Ns個之共同編碼與調變方案會用於 Ns個特徵模式。 、 在一傳送方案中,若一群組將用於資料傳送,則會選取 该群組中所有Nf頻率檔(即任何活動特徵模式都必須是一 完整特徵模式)。若一或多個頻率檔不再使用時,則特徵模 式的頻率可選擇之特性可誇大。該較大的頻率可選擇衰減 會引起較高的符號間干擾(181)位準,這是_種現象,其中 已接收信號中的各符號充#已接收信號中隨後符號的失 真。因此可能在接收器處需要等化,以減輕⑻失真的有害 放果。藉由在選用的各特徵模式的所有頻率檔上實施全頻 道轉換’來避免等化。傳送方案可與排序形式以及填水法 功率配置有利地配合使用’如上所述’指數較低的特徵模 式不太可此具有太多壞頻率樓。 、 圖2所示的係總傳送功率匕㈣㈡之三個傳送方案(例如 4x4多重輸出多重輸入系統)所獲得的平均頻譜效率之曲綠 圖:圖2顯示了三個傳送方案的三個曲線圖:⑴所有傳: 頻道的填水法功率配置’(2)應用於所有傳送頻道的可選擇 頻道轉換(所有頻道SCI),以及(3)單獨應用於各特徵模 的可選擇頻道轉換(每_特徵模式SCI),總傳送功率依據^ 87638-990106.doc -23- 丄 平均頻道SNR使用填水法分佈在四個群組中。 描输平均頻譜效率與操作SNR的比,其定義為^ =ι/ 2 :2表示填水法功率配置(曲線21〇)會產生最高的。頻二 -、。當頻譜效率為15 bps/Hz的情況下,所有頻道su^案 的性能(曲線230)低於最佳填水法方案的性能约25肋。但 適用於所有頻道的SCI方案會大幅降低發射器與接收器的 複雜性,由於單一資料率與共同編碼/調變方案可用於所有 選取的傳送頻道。在15 bps/Hz的頻譜效率時,.每一特徵模 式SCI方案(曲線22〇)的性能低於填水法方案性能約1 5 dB,高於所有頻道SCI方案的性能。該結果係可期待 的’因各特徵模式SCI方案組合了填水法和可選擇頻道轉 換。儘管各特徵料们方案比所有頻道SCI方案複雜,但 不如填水法方案複雜,且獲得了可比的性能。 圖3係MIMO_OFDM系統3 〇〇中一接取點3〗〇與一使用者 終端機3 5 0之方塊圖。 -在接取點31G處,將來自f料源312之資料流量(即資訊位 疋)提供至傳送(TX)f料處理器314,其能對資料進行編碼、 交錯以及調變以提供調變符號。TX Mmo處理器320可進 一步處理調變符號’以提供已預調㈣符號,料符號隨 後會以引導資料進行多工處理,並提供至〜個調變器 _D)322a至322t,各用於每個傳送天線。各調變器似會 處理預§周卽符號的個另丨丨、丨、,立 一卩付观旳個別抓以產生一調變後信號,該信號隨 後會經由各個別天線324傳送。 在使用者終端機350處’從Ντ個天線324a至324t傳送的調 87638-990106.doc -24- 變後信號由nr個天線3523至3521·接收。將來自各天線352 的已接收信號提供至個別解調變器(DEM〇D)354。各解調 變器354調節(例如過濾、放大以及頻率降頻)並數位化已接 收乜號,以提供一樣本流,並進一步處理該等樣本,以提 供一已接收符號流。RX MIM〇處理器36〇隨後會處理Nr個 已接收符號流以提供Ντ個已還原符號流,其為接取點發送 的調變符號的估計。 從使用者終端機至接取點的反向路徑的處理可以與正 向路徑的處理類似,亦可不相同。反向路徑可用於將頻道 狀態貝訊(channel state inf〇rmati〇n ; CSI)從使用者終端機 發回至接H CSI可用於接取點,以制適#之編碼與 調變方案,並實施可選擇頻道轉換。 控制器330與370分別控制接取點與使用者終端機的作 業。己隐體332與3 72分別為控制器33〇與37〇使用的程式碼 與資料提供儲存。 圖4為一發射器單元4〇〇之—項具體實施例之方塊圖,其 ^圖3中接取點31〇的發射器部分之—具體實施例。發射器 單元400亦可用於使用者終端機乃^。 個 從 個 在tx資料處理器314内,編碼器/擊穿器412依據一或多 編碼方案接收資料流量(即資訊位元)並對其進行編碼, :提供已編碼之位元。頻道交錯器414隨後依據一或多 交錯方案將已編碼之位元進行交錯,從而提供—時間、 空間與/或頻率分集之組合。 該等已交錯資料依據一或 —符號映射元件41 6隨後會將 多個調變方案(例如qPSIC、 8763 8-990106.doc -25. 1324862 m-PSK、m_qam等等)進行映射,從而提供調變抑 Ns個群組的編碼與調變可以不同方式實施。在一二 實施例中,-單獨編碼與調變方案可用於傳送頻道的= 組,該頻道應用了可選擇頻道轉換。就該具體實施例而言群 -組獨立的編碼器、交錯器以及符號映射元件可用於 組。在-項具體實施例中共同編碼方案可用於所 組,隨後進行各群組的可變比率擊穿器以及獨立調變方 案。該具體實施例可減少發射器與接收器之硬體的複雜 性。在另—項具體實施例中,交織編碼與渦輪編碼亦可^ 於對資訊位元進行編碼。 在TX MIMO處理器320内,多重輸出多重輸入頻道的脈 衝回應之估計可提供給-快速富利葉轉換(fast FFT)單元422,作為時域樣本的矩陣之序列, 立(n) »FFT單元422隨後會在nf個矩陣立(n)的各組上實施— FFT,以提供一組對應的Νρ個估計頻道頻率回應矩陣, A(k),其中 ke{l,...,NF}。 如上所述,單元424隨後會在各矩率£(k)上實施特徵值 分解,以提供單位矩陣运(k)以及對角矩陣以k)。將對角矩 陣DXk)提供給一功率配置單元43 〇,將單位矩陣髟k)提供給 一空間處理器450。 功率配置單元430使用上述群組功率配置方案中的任何 一種,將總傳送功率Ptotal分佈至Ns個群組。這將引起^個 群組的PG(i)的功率配置,其中ied.,Ν〇。單元430隨後 將依據該群組配置到的傳送功率pG(i)獨立實施各群組的 87638-990106.doc -26- 1324862 可選擇頻道轉換。#脸2丨* 轉換乂將弓!起各群组 率配置,其仏{1 貞羊檔的P,(k)的功 ^ ^ ^ , ,F},其中,群組中—或多檔中,ρ.πο 可切零(若未要求任何 ^ Pl(k) 式)。單元4W 須為完整特徵模 32可貫施填水法分 可實#久群,& 刀忡〜·得达功率,單元434 了貫她各群組的可選擇頻道轉 配倾供給-信號縮放單㈣/有傳送頻道的功率 二:依據功率配置接收與縮放調變符號,從而提 下…臭的調變符號。各調變符號的信號縮 _=_倾,其中ie{1”..,NS}以及ke{1,,nf},式(26) 為在頻率檔k的特徵模式丨上傳送的調變符號, 】·()為相應的縮放後的調變符號,而涵為該符號的縮放 因數’以獲得頻道轉換。 空間處理器450隨後會依據單位矩陣_預調節縮放後 的調變符號,從而提供預調節的符號,如下: 式(27) 其中τ,iW = [S】(k) s2(k) .· SNT(k)r,讲)=(Xi(k) χ2(]〇 μ (k))T,而\(]〇為在發射天線i的頻率檔]^傳送的預調節符號T。 若NS<NT,則!(k)將包括Ns個非零項,而其餘化至吣各項 可以為零。 多工器(multiplexer ; MUX)452能接收並用預調節的符號 多工處理引導資料。引導資料可在所有或一個傳送頻道的 子集上傳送,可用於接收器,以估計多重輸出多重輸入頻 87638-990106.doc -27- 1324862 道。多工器452可向各OFDM調變器322提供一預調節的符 號流。 在各OFDM調變器322内,IFFT單元能接收預調節的符號 流並在Nf頻率檔的各Nf符號集上實施倒轉的FFT,從而獲 得相應的時域代表,其稱為〇FDM符號。就各〇fdm符號而 言,循環前置產生器能重覆〇FDM符號的部分,以形成對 f的傳送符號。循環前置能確保在存在多路徑延遲擴展的 情況下’傳送符號能保留其正交特性。—發射器單元隨後 將傳送符號轉化為―或多個類比㈣,並進_步調節(例如 放:、過濾以及頻率向上轉換)該等類比信號,以產生已調 變信號,隨後將該信號從相關聯天線324傳送。 圖5係在每—特徵模式上使用可選擇㈣轉換來處 ㈣程序500的—具體實施例之流程圖。最初,將需 =料依據-或多個編碼與調變方案編碼並調變(步驟 將可用的傳运頻道配置成數個群組,其中各群組可 :既定特徵模式的所有頻率檔(步驟514)。(各群組亦 義為包括多個特徵模式的頻率檔,或只包括單 的頻率檔之子集。)隨後使用特定群組功率配 4果式 送功率配置至該群組(步驟516)。 $案將總傳 而隨Γ即各呈群有组獨立實施可選擇頻道轉換。就各選用的群% 即具有配置到的非零傳送功率),可依據 兔 的傳送功率選用用於資料傳送的—或多個頻:: 5 1 8)。或者,若即將使用哕 (步驟 亥群組,則可選用該群纽中的所 87638-990106.doc -28- 1324862 有頻率檔。隨後可決定各選取的頻率檔的縮放因數,以使 各群组所有選取的頻率檔都具有類似的已接收信號品質, 該品質可由已接收的SNR、已接收功率或某些其他測量量 化(步驟520)。 隨後,用於傳送該調變符號的頻率檔的縮放因數會縮放 各調變符號(步驟522) ^可進一步預調節該等已縮放調變符 號,以將多重輸出多重輸入頻道對角化(步驟524)。進一步 處理並傳送該等預調節的符號。 為清晰起見,上述已說明了特定具體實施例。該等具體 實施例之變更或其他具體實施例亦可依據此處所述之技 術衍生。例如’無需對發射器使用具有空間處理(即預調節) 的各特徵模式SCI方案1亦可使用其他技術將多重輸出多 重輸入頻道對角化,而無需在發射器處實施預調節。某些 該等技術已在美國專利申請案序號〇9/993,〇87中說明,其 名為「多向近接多重輸出多重輸入(Multiple_input MuUiple-0utput ; MIM〇)通信系統」,於2〇〇ι年i i月ό日提 出申請,並讓渡給本申請案的受讓人,此處以提及方式併 入本文中》若不對發射器實施空間處理,則可對每一發射 天線或某些其他群組單元應用可選擇頻道轉換。 如上所述’可依據估計頻道回應矩陣砂)對發射器實施 可選擇頻道轉換。亦可依據頻道增益、已接收的或某 …、他已接號品質之測量’對接收器實施可選擇頻道 轉換。妹何情況下,發射器會具有充足的頻道狀態資訊 (channel Stateinformati〇n;CSI),可以係任何形式,以使 87638-990106.doc •29- 1324862 其旎決定(l)各特徵模式所使用的特定資料率以及蝙碼調 變方案以及(2)各選取的傳送頻道所使用的傳送功率(戋縮 放因數),以使各群組中的頻道在接收器處都具有類似的作 號品質(即轉換選取的傳送頻道)。 此處所述之技術亦可用於在定義為除單一特徵模式以 外之模式的群組上實施可選擇頻道轉換。例如,一群組可 定義為包括多重特徵模式的頻率檔,或只是與一或多個特 徵模式的頻率檔相同,等等。 為清晰起見,已明確說明了 MIMO-OFOM系統中每一特 徵模式上可選擇頻道轉換的實施技術。該等技術亦可用於 不使用OFDM的多重輸出多重輸入系統。此外,儘管已經 按正向鏈路明確說明了特定具體實施例,該等技術亦可應 用於反向鏈路。 此處所述之技術可藉由各種構件實施。舉例而言,這些 技術可貫施在硬體、軟體或其組合令。對於硬體實施方 案,貫施該等技術之任一種或一組合所使用元件的範圍 為:一或多個特定應用積體電路(ASIC)、數位信號處理器 (DSP)、數位信號處理裝置(DspD)、可程式邏輯裝置(pLD)、 場可程式閘極陣列(FPGA)、處理器、控制器 '微控制器、 微處理器、其他為實行本文所述功能設計的電子單元或其 組合。 對於軟體實施,此處所述之技術可使用執行在此說明的 該等功能之模組實施(例如程式、功能等)^軟體代碼可儲 存在一記憶體單元内(如,圖3的記憶體332或3 72)及由一處 87638-990106.doc -30- ^24862 理器執行(如控制11 330或37〇)。記憶體單元可實施在處理 器内部或處理器外部’在此情況下,記憶體單元可經由技 藝中热知的各種裝置以通信方式耦合至處理器。 此處所包括用於參考的標題係、用來輔助定位某些段落。 這些標題並不是要限制此處所述之觀念的範圍,而這些觀 念可以應用到整個說明文件的其他段落。 前面對該等已揭露之具體實施例所作的說明可讓熟習 本技術的人士製造或利用本發明。熟悉技術人士應明白該 等具體實施例可進行各種修改,而且在此定義的—般原理 可應用於其他具體實施例而不背離本發明之精神或範疇。 因此,本發明並不意味著受限於在此所示的該等具體實施 例,而係符合與在此揭示的該等原理及新穎特徵相一致的 最廣範疇。 【圖式簡單說明】 本發明的特徵、性質及優點可從以上詳細說明及配合附 圖之後,即可更為瞭解,其中類似的參考符號代表整篇中 相對應的元件,其中: 圖1說明了一MIMO-OFDM系統之特徵值分解。 圖2所不的係三個傳送方案(例如4 χ4多重輸出多重輸入 系統)所獲得的平均頻譜效率之曲線圖; 圖3係MIMO-OFDM系統中一接取點與一使用者終端機 之方塊圖; 圖4係接取點中一發射器單元之方塊圖;以及 圖5係使用每一特徵模式之可選擇頻道轉換處理資料的 87638-990106.doc -31 - 1324862 一流程圖。 【圖式代表符號說明 300 3 10 312 314 320 322 324 350 352 354 360 400 412 414 416 422 430 432 434 440 450 452 87638-990106.doc MIMO-OFDM 系統 接取點 資料源 傳送資料處理器 ΤΧ ΜΙΜΟ處理器 OFDM調變器 天線 使用者終端機 天線 解調變器 RX ΜΙΜΟ處理器 發射器單元 編碼器/擊穿器 頻道交錯器 符號映射元件 快速富利葉轉換單元 功率配置單元 00 — 早70 χΐΌ 一 早兀 信號縮放單元 空間處理器 多工器 -32- 1324862 322a 調變器 324a至 324t 天線 330 ' 370 控制器 332 、 372 記憶體 352a至 352r 天線 87638-990106.doc -33-
Claims (1)
- 拾、申請專利範圍: 1. 一種在一多重輸出多重輸入(MIM0)通信系統中處理傳 送資料之方法,其包括: 將複數個可用傳送頻道配置成複數個群組;以及 針對將用於資料傳送的各傳送頻道群組, 在該群組中選用一或多個傳送頻道,以及 決定各選取的傳送頻道的—縮放因數,以便各群組 中該等-或多個選取的傳送頻道具有類似的已接收到 的信號品質。 2·如申請專利範圍第旧之方法,其中各群組包括對應於— 多重輸出多重輸人頻道的—特定特徵模式之所有傳送頻 道0 3.如申請專利範圍第1項之方法,尚包括: 將總傳送功率配置至該等複數個群組,且其中各群组 中該等-或多個選取的傳送頻道的該等一或多個縮放因 數係部分依據配置至該群組的該傳送功率決定。 4. 如申請專利範圍第3項之方 丹τ將该總傳送功率均勻 地配置至該等複數個群組。 5. 如申請專利範圍第3項之方法,1 , 甲依據填水法將該總傳 送功率配置至該等複數個群組。 6. 如申請專利範圍第5項之方 八中’橫跨該等複數個可 87638-990106.doc 1324862 用傳送頻道實施該填水法,且其h置至料組的該傳 送功率係依據配置至該群組中該等複數個傳送頻道的傳 送功率。 7. 如申請專利範圍第5項之方法,其 〃、 依據該寺複數個群 組的平均信號對雜訊及干擾比(SNR)實施該填水法。 8. 如申請專利範圍第5項之方法, Γ任頻道轉換後,依據 該等複數個可用傳送頻道的平均信號對雜訊及干擾比 (SNR)實施該填水法。 9-如申請專利範圍第】項之方法 次 右辟組係要用於 貝料傳送’則選用該群組中所有的傳送頻道。 10.如申請專利範圍第丨項之方法,尚包括: 依據一或多個編碼與調變方案 貪枓進仃編碼與調 變’以提供調變符號;及 依據用於傳送該調變符號 浔迗頻道的縮放因數對 各調變符號進行縮放。 11. 如申請專利範圍第10項之方法,其 — 、 各傳送頻道群組 的資料都依據-獨立編碼方案進行編碼。 12. 如申請專利範圍第10項之方法, Ύ 所有傳送頻道群 組的資料都係依據一共同編碼方素進行編碼且其中各 群組的編碼資料係以一該群組選用的比率進行擊穿。 13·如申請專利範圍第10項之方法,尚包括: 87638-990106.doc -2 · 預調節已縮放的調變符號。 如申清專利範圍第1項之方法,其中,該多重輸出多重輸 入系統實施正交分頻多工(OFDM)。 種在一多重輸出多重輸入(ΜΙΜΟ)通信系統中之發射 器單元,其包括: 料處理器,其可運作以依據一或多個編竭與調 變方案對資料進行編碼與調變,以提供調變符號;以及 ,一ΤΧΜΙΜ⑽理器,其可運作以在用於資料傳送的傳 达頻道的各複數個群組内,選取__或多個傳送頻道決 ^各選取的傳送頻道的-縮放因數,以使各群组中的該 等或夕個選取的傳送頻道具有類似的已接收到的信號 品質’並依據用於傳送該調變符號的該傳 放因數縮放各調變符號。 的亥縮 16.如申凊專利範圍第15項之發射器單元,其中,該η ΜIΜ Ο處理益尚運作以脾她质、、, 運乍以將總傳廷功率配置至該等複數個 群組,且其中各群組中兮耸— 、 以等或夕個選取的傳送頻道的 該等一或多個縮放因數係部分依據配置至該群組的該傳 送功率決定。 發射器單元,其中該Τχ 17.如申請專利範圍第ls項之 ΜΙΜΟ處理器係運作以 其中各群 向傳送頻道的複數個群組配置總傳送功率, 87638-990106.doc -3- 18. 括對應於—多重輸入多重輸出頻道的一特定特徵模 式之所有傳送頻道。 士申。月專利範圍第15項之發射器單元,其中該τχ mim〇 處理器進-步運作以預調節已縮放的調變符號。 19. 20. 種在夕重輸出多重輸入(ΜΙΜΟ)通信系統中之裝 置’其包括: 配置構件’其用於將複數個可用傳送頻道配置成複數 個群組; k取構件,其用於在各群組中選取一或多個傳送頻道 用於資料傳送;及 决疋構件,其用於決定各選取的傳送頻道的一縮放因 數,以便各群組中該等一或多個選取的傳送頻道具有類 似的已接收到的信號品質。 如申請專利範圍第19項之裝置,尚包括: 名碼與調變構件,其依據一或多個編碼與調變方案對 資料進行編碼與調變以提供調變符號;及 縮放構件,其用於依據用於傳送該調變符號之該傳送 頻道的该縮放因數’對各調變符號進行縮放。 87638-990106.doc -4 -
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/229,209 US8194770B2 (en) | 2002-08-27 | 2002-08-27 | Coded MIMO systems with selective channel inversion applied per eigenmode |
Publications (2)
Publication Number | Publication Date |
---|---|
TW200414708A TW200414708A (en) | 2004-08-01 |
TWI324862B true TWI324862B (en) | 2010-05-11 |
Family
ID=31976188
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
TW092123617A TWI324862B (en) | 2002-08-27 | 2003-08-27 | Coded mimo systems with selective channel inversion applied per eigenmode |
Country Status (16)
Country | Link |
---|---|
US (1) | US8194770B2 (zh) |
EP (1) | EP1532762B1 (zh) |
JP (1) | JP4386836B2 (zh) |
KR (1) | KR100983231B1 (zh) |
CN (1) | CN100370721C (zh) |
AU (1) | AU2003265601B2 (zh) |
BR (1) | BR0313819A (zh) |
CA (1) | CA2496619A1 (zh) |
DE (1) | DE60310237T2 (zh) |
HK (1) | HK1083283A1 (zh) |
IL (1) | IL166579A0 (zh) |
MX (1) | MXPA05002229A (zh) |
RU (1) | RU2328074C2 (zh) |
TW (1) | TWI324862B (zh) |
UA (1) | UA84684C2 (zh) |
WO (1) | WO2004021634A1 (zh) |
Families Citing this family (114)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6956907B2 (en) * | 2001-10-15 | 2005-10-18 | Qualcomm, Incorporated | Method and apparatus for determining power allocation in a MIMO communication system |
US20040081131A1 (en) | 2002-10-25 | 2004-04-29 | Walton Jay Rod | OFDM communication system with multiple OFDM symbol sizes |
US8218609B2 (en) | 2002-10-25 | 2012-07-10 | Qualcomm Incorporated | Closed-loop rate control for a multi-channel communication system |
US8208364B2 (en) * | 2002-10-25 | 2012-06-26 | Qualcomm Incorporated | MIMO system with multiple spatial multiplexing modes |
US7324429B2 (en) | 2002-10-25 | 2008-01-29 | Qualcomm, Incorporated | Multi-mode terminal in a wireless MIMO system |
US7986742B2 (en) | 2002-10-25 | 2011-07-26 | Qualcomm Incorporated | Pilots for MIMO communication system |
US8169944B2 (en) | 2002-10-25 | 2012-05-01 | Qualcomm Incorporated | Random access for wireless multiple-access communication systems |
US8134976B2 (en) * | 2002-10-25 | 2012-03-13 | Qualcomm Incorporated | Channel calibration for a time division duplexed communication system |
US7002900B2 (en) | 2002-10-25 | 2006-02-21 | Qualcomm Incorporated | Transmit diversity processing for a multi-antenna communication system |
US8170513B2 (en) | 2002-10-25 | 2012-05-01 | Qualcomm Incorporated | Data detection and demodulation for wireless communication systems |
US8320301B2 (en) | 2002-10-25 | 2012-11-27 | Qualcomm Incorporated | MIMO WLAN system |
US8570988B2 (en) * | 2002-10-25 | 2013-10-29 | Qualcomm Incorporated | Channel calibration for a time division duplexed communication system |
WO2004049596A1 (ja) * | 2002-11-26 | 2004-06-10 | Matsushita Electric Industrial Co., Ltd. | 通信方法及び送信装置、受信装置 |
US7317770B2 (en) * | 2003-02-28 | 2008-01-08 | Nec Laboratories America, Inc. | Near-optimal multiple-input multiple-output (MIMO) channel detection via sequential Monte Carlo |
US9325532B2 (en) * | 2003-06-30 | 2016-04-26 | Avago Technologies General Ip (Singapore) Pte. Ltd. | Method and apparatus for communicating symbols in a multiple input multiple output communication system using interleaved subcarriers across a plurality of antennas |
US7245879B2 (en) * | 2003-08-08 | 2007-07-17 | Intel Corporation | Apparatus and associated methods to perform intelligent transmit power control with subcarrier puncturing |
US7065144B2 (en) * | 2003-08-27 | 2006-06-20 | Qualcomm Incorporated | Frequency-independent spatial processing for wideband MISO and MIMO systems |
US7742546B2 (en) * | 2003-10-08 | 2010-06-22 | Qualcomm Incorporated | Receiver spatial processing for eigenmode transmission in a MIMO system |
US9226308B2 (en) | 2003-10-15 | 2015-12-29 | Qualcomm Incorporated | Method, apparatus, and system for medium access control |
US8483105B2 (en) | 2003-10-15 | 2013-07-09 | Qualcomm Incorporated | High speed media access control |
US8842657B2 (en) | 2003-10-15 | 2014-09-23 | Qualcomm Incorporated | High speed media access control with legacy system interoperability |
US8462817B2 (en) * | 2003-10-15 | 2013-06-11 | Qualcomm Incorporated | Method, apparatus, and system for multiplexing protocol data units |
US8233462B2 (en) | 2003-10-15 | 2012-07-31 | Qualcomm Incorporated | High speed media access control and direct link protocol |
US8472473B2 (en) | 2003-10-15 | 2013-06-25 | Qualcomm Incorporated | Wireless LAN protocol stack |
US8284752B2 (en) * | 2003-10-15 | 2012-10-09 | Qualcomm Incorporated | Method, apparatus, and system for medium access control |
KR100520159B1 (ko) * | 2003-11-12 | 2005-10-10 | 삼성전자주식회사 | 다중 안테나를 사용하는 직교주파수분할다중 시스템에서간섭신호 제거 장치 및 방법 |
KR100996080B1 (ko) | 2003-11-19 | 2010-11-22 | 삼성전자주식회사 | 직교 주파수 분할 다중 방식을 사용하는 통신 시스템에서적응적 변조 및 코딩 제어 장치 및 방법 |
US9473269B2 (en) * | 2003-12-01 | 2016-10-18 | Qualcomm Incorporated | Method and apparatus for providing an efficient control channel structure in a wireless communication system |
US7818018B2 (en) * | 2004-01-29 | 2010-10-19 | Qualcomm Incorporated | Distributed hierarchical scheduling in an AD hoc network |
US8903440B2 (en) * | 2004-01-29 | 2014-12-02 | Qualcomm Incorporated | Distributed hierarchical scheduling in an ad hoc network |
US7356017B2 (en) | 2004-02-19 | 2008-04-08 | Nokia Corporation | Data loading method, transmitter, and base station |
US8315271B2 (en) * | 2004-03-26 | 2012-11-20 | Qualcomm Incorporated | Method and apparatus for an ad-hoc wireless communications system |
US11394436B2 (en) | 2004-04-02 | 2022-07-19 | Rearden, Llc | System and method for distributed antenna wireless communications |
US10425134B2 (en) | 2004-04-02 | 2019-09-24 | Rearden, Llc | System and methods for planned evolution and obsolescence of multiuser spectrum |
US9312929B2 (en) | 2004-04-02 | 2016-04-12 | Rearden, Llc | System and methods to compensate for Doppler effects in multi-user (MU) multiple antenna systems (MAS) |
US8654815B1 (en) | 2004-04-02 | 2014-02-18 | Rearden, Llc | System and method for distributed antenna wireless communications |
US11451275B2 (en) | 2004-04-02 | 2022-09-20 | Rearden, Llc | System and method for distributed antenna wireless communications |
US9819403B2 (en) | 2004-04-02 | 2017-11-14 | Rearden, Llc | System and method for managing handoff of a client between different distributed-input-distributed-output (DIDO) networks based on detected velocity of the client |
US10886979B2 (en) | 2004-04-02 | 2021-01-05 | Rearden, Llc | System and method for link adaptation in DIDO multicarrier systems |
US10200094B2 (en) | 2004-04-02 | 2019-02-05 | Rearden, Llc | Interference management, handoff, power control and link adaptation in distributed-input distributed-output (DIDO) communication systems |
US11309943B2 (en) | 2004-04-02 | 2022-04-19 | Rearden, Llc | System and methods for planned evolution and obsolescence of multiuser spectrum |
US10749582B2 (en) | 2004-04-02 | 2020-08-18 | Rearden, Llc | Systems and methods to coordinate transmissions in distributed wireless systems via user clustering |
US10277290B2 (en) | 2004-04-02 | 2019-04-30 | Rearden, Llc | Systems and methods to exploit areas of coherence in wireless systems |
US10187133B2 (en) * | 2004-04-02 | 2019-01-22 | Rearden, Llc | System and method for power control and antenna grouping in a distributed-input-distributed-output (DIDO) network |
US8542763B2 (en) | 2004-04-02 | 2013-09-24 | Rearden, Llc | Systems and methods to coordinate transmissions in distributed wireless systems via user clustering |
US10985811B2 (en) | 2004-04-02 | 2021-04-20 | Rearden, Llc | System and method for distributed antenna wireless communications |
US9826537B2 (en) | 2004-04-02 | 2017-11-21 | Rearden, Llc | System and method for managing inter-cluster handoff of clients which traverse multiple DIDO clusters |
US7346115B2 (en) * | 2004-04-22 | 2008-03-18 | Qualcomm Incorporated | Iterative eigenvector computation for a MIMO communication system |
US7564814B2 (en) * | 2004-05-07 | 2009-07-21 | Qualcomm, Incorporated | Transmission mode and rate selection for a wireless communication system |
JP4604798B2 (ja) * | 2004-05-10 | 2011-01-05 | ソニー株式会社 | 無線通信システム、無線通信装置及び無線通信方法、並びにコンピュータ・プログラム |
US7620096B2 (en) * | 2004-05-25 | 2009-11-17 | New Jersey Institute Of Technology | Equal BER power control for uplink MC-CDMA with MMSE successive interference cancellation |
US8401018B2 (en) * | 2004-06-02 | 2013-03-19 | Qualcomm Incorporated | Method and apparatus for scheduling in a wireless network |
US8457152B2 (en) * | 2004-07-16 | 2013-06-04 | Qualcomm Incorporated | Multiple modulation schemes in single rate layering wireless communication systems |
US9685997B2 (en) | 2007-08-20 | 2017-06-20 | Rearden, Llc | Systems and methods to enhance spatial diversity in distributed-input distributed-output wireless systems |
US7864659B2 (en) | 2004-08-02 | 2011-01-04 | Interdigital Technology Corporation | Quality control scheme for multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) systems |
CN101800579A (zh) * | 2004-08-11 | 2010-08-11 | 美商内数位科技公司 | 改善系统性能的信道发声 |
JP3754441B1 (ja) * | 2004-09-10 | 2006-03-15 | 三洋電機株式会社 | 受信方法ならびに装置およびそれを利用した通信システム |
CN101065913B (zh) * | 2004-11-17 | 2011-08-10 | 皇家飞利浦电子股份有限公司 | 在信道状态信息辅助的多输入多输出(mimo)系统中的鲁棒无线多媒体传输 |
EP1817857B1 (en) * | 2004-12-02 | 2012-10-31 | New Jersey Institute of Technology | Method and system for reduction of PAPR |
US7590195B2 (en) * | 2005-02-23 | 2009-09-15 | Nec Laboratories America, Inc. | Reduced-complexity multiple-input multiple-output (MIMO) channel detection via sequential Monte Carlo |
US7565113B2 (en) * | 2005-03-29 | 2009-07-21 | Sony Corporation | Method and apparatus to resist fading in mimo and simo wireless systems |
JP4604800B2 (ja) * | 2005-04-01 | 2011-01-05 | ソニー株式会社 | 無線通信装置及び無線通信方法 |
US7466749B2 (en) | 2005-05-12 | 2008-12-16 | Qualcomm Incorporated | Rate selection with margin sharing |
US8358714B2 (en) * | 2005-06-16 | 2013-01-22 | Qualcomm Incorporated | Coding and modulation for multiple data streams in a communication system |
US8600336B2 (en) | 2005-09-12 | 2013-12-03 | Qualcomm Incorporated | Scheduling with reverse direction grant in wireless communication systems |
US7746815B2 (en) * | 2005-09-23 | 2010-06-29 | Samsung Electronics Co., Ltd | Hybrid forwarding apparatus and method for cooperative relaying in an OFDM network |
KR100906333B1 (ko) * | 2006-01-11 | 2009-07-06 | 삼성전자주식회사 | 공간분할 다중접속 시스템에서 무선주파수 밴드 자원을 병합하여 할당하는 장치 및 방법 |
US7924698B2 (en) * | 2006-04-21 | 2011-04-12 | Fujitsu Limited | Proportional fair scheduler for OFDMA wireless systems |
JP4838353B2 (ja) * | 2006-06-16 | 2011-12-14 | テレフオンアクチーボラゲット エル エム エリクソン(パブル) | マルチアンテナシステムにおけるチャネル品質測定値を得るための方法 |
CN101094022B (zh) * | 2006-06-19 | 2012-12-19 | 联想(北京)有限公司 | 发射机、通信系统以及通信方法 |
CN101106435B (zh) * | 2006-07-10 | 2011-08-03 | 华为技术有限公司 | 一种多对线共同传输的方法及发送端和接收端 |
WO2008021182A2 (en) * | 2006-08-09 | 2008-02-21 | Interdigital Technology Corporation | Method and apparatus for providing differentiated quality of service for packets in a particular flow |
MX2009007274A (es) | 2007-01-05 | 2009-07-10 | Lg Electronics Inc | Metodo para mapeo de estrato y metodo de transmision de datos para sistema de entrada multiple salida multiple. |
KR100986938B1 (ko) * | 2007-04-26 | 2010-10-12 | 재단법인서울대학교산학협력재단 | 다중 입력 다중 출력 시스템의 부분 적응 송신 장치 및 방법 |
US20090103488A1 (en) * | 2007-06-28 | 2009-04-23 | University Of Maryland | Practical method for resource allocation for qos in ofdma-based wireless systems |
EP2173041B1 (en) * | 2007-07-23 | 2017-03-01 | Alcatel Lucent | Power controlling method and corresponding base station |
JP2010212822A (ja) * | 2009-03-09 | 2010-09-24 | Toshiba Corp | 通信システム、送信装置、及び受信装置 |
US20100238984A1 (en) * | 2009-03-19 | 2010-09-23 | Motorola, Inc. | Spatial Information Feedback in Wireless Communication Systems |
US8467786B2 (en) | 2009-05-04 | 2013-06-18 | Motorola Mobility Llc | Communication devices and methods for providing services to communication devices in a communication system including a private cell |
US9002354B2 (en) | 2009-06-12 | 2015-04-07 | Google Technology Holdings, LLC | Interference control, SINR optimization and signaling enhancements to improve the performance of OTDOA measurements |
US8873650B2 (en) | 2009-10-12 | 2014-10-28 | Motorola Mobility Llc | Configurable spatial channel information feedback in wireless communication system |
US9059818B2 (en) | 2009-10-16 | 2015-06-16 | Lg Electronics Inc. | Method and apparatus for transmitting multi-user MIMO reference signal in wireless communication system for supporting relay |
US8917677B2 (en) | 2010-04-14 | 2014-12-23 | Samsung Electronics Co., Ltd. | Systems and methods for bundling resource blocks in a wireless communication system |
US8509338B2 (en) | 2010-05-05 | 2013-08-13 | Motorola Mobility Llc | Method and precoder information feedback in multi-antenna wireless communication systems |
US9203489B2 (en) | 2010-05-05 | 2015-12-01 | Google Technology Holdings LLC | Method and precoder information feedback in multi-antenna wireless communication systems |
US8537658B2 (en) | 2010-08-16 | 2013-09-17 | Motorola Mobility Llc | Method of codebook design and precoder feedback in wireless communication systems |
WO2012053854A2 (ko) * | 2010-10-21 | 2012-04-26 | 엘지전자 주식회사 | 다중 노드 시스템에서 신호 전송 방법 |
US9241318B2 (en) * | 2010-12-23 | 2016-01-19 | Electronics And Telecommunications Research Institute | Apparatus and method for receiving data in communication system |
JP5813871B2 (ja) * | 2011-08-05 | 2015-11-17 | インテル コーポレイション | 異なる送信電力レベルでのマルチmcsofdm伝送のための無線通信装置及び方法 |
US9049239B2 (en) | 2011-11-21 | 2015-06-02 | Intel Corporation | Wireless device and method for low power and low data rate operation |
KR101953244B1 (ko) | 2012-04-26 | 2019-02-28 | 삼성전자주식회사 | 다중 사용자 mimo 통신 시스템에서의 사용자 스케쥴링 방법 및 장치 |
US10194346B2 (en) | 2012-11-26 | 2019-01-29 | Rearden, Llc | Systems and methods for exploiting inter-cell multiplexing gain in wireless cellular systems via distributed input distributed output technology |
US11189917B2 (en) | 2014-04-16 | 2021-11-30 | Rearden, Llc | Systems and methods for distributing radioheads |
US11190947B2 (en) | 2014-04-16 | 2021-11-30 | Rearden, Llc | Systems and methods for concurrent spectrum usage within actively used spectrum |
US11050468B2 (en) | 2014-04-16 | 2021-06-29 | Rearden, Llc | Systems and methods for mitigating interference within actively used spectrum |
US9813262B2 (en) | 2012-12-03 | 2017-11-07 | Google Technology Holdings LLC | Method and apparatus for selectively transmitting data using spatial diversity |
US9591508B2 (en) | 2012-12-20 | 2017-03-07 | Google Technology Holdings LLC | Methods and apparatus for transmitting data between different peer-to-peer communication groups |
US9979531B2 (en) | 2013-01-03 | 2018-05-22 | Google Technology Holdings LLC | Method and apparatus for tuning a communication device for multi band operation |
US10229697B2 (en) | 2013-03-12 | 2019-03-12 | Google Technology Holdings LLC | Apparatus and method for beamforming to obtain voice and noise signals |
US10164698B2 (en) | 2013-03-12 | 2018-12-25 | Rearden, Llc | Systems and methods for exploiting inter-cell multiplexing gain in wireless cellular systems via distributed input distributed output technology |
US9973246B2 (en) | 2013-03-12 | 2018-05-15 | Rearden, Llc | Systems and methods for exploiting inter-cell multiplexing gain in wireless cellular systems via distributed input distributed output technology |
US10488535B2 (en) | 2013-03-12 | 2019-11-26 | Rearden, Llc | Apparatus and method for capturing still images and video using diffraction coded imaging techniques |
US9923657B2 (en) | 2013-03-12 | 2018-03-20 | Rearden, Llc | Systems and methods for exploiting inter-cell multiplexing gain in wireless cellular systems via distributed input distributed output technology |
RU2767777C2 (ru) | 2013-03-15 | 2022-03-21 | Риарден, Ллк | Системы и способы радиочастотной калибровки с использованием принципа взаимности каналов в беспроводной связи с распределенным входом - распределенным выходом |
US9386542B2 (en) | 2013-09-19 | 2016-07-05 | Google Technology Holdings, LLC | Method and apparatus for estimating transmit power of a wireless device |
US9549290B2 (en) | 2013-12-19 | 2017-01-17 | Google Technology Holdings LLC | Method and apparatus for determining direction information for a wireless device |
US11290162B2 (en) | 2014-04-16 | 2022-03-29 | Rearden, Llc | Systems and methods for mitigating interference within actively used spectrum |
US9491007B2 (en) | 2014-04-28 | 2016-11-08 | Google Technology Holdings LLC | Apparatus and method for antenna matching |
US9478847B2 (en) | 2014-06-02 | 2016-10-25 | Google Technology Holdings LLC | Antenna system and method of assembly for a wearable electronic device |
KR101794028B1 (ko) * | 2016-02-19 | 2017-11-06 | 국방과학연구소 | 다중 트랜스듀서를 갖는 수중통신 시스템에서의 부반송파 전력할당 장치 및 그 할당 방법 |
CN108206712B (zh) * | 2016-12-19 | 2021-04-27 | 上海诺基亚贝尔股份有限公司 | 用于对上行大规模mimo信号进行预合并处理的方法和装置 |
US11665684B2 (en) * | 2018-05-14 | 2023-05-30 | Apple Inc. | Mechanism on measurement gap based in inter-frequency measurement |
CN111224696B (zh) * | 2018-11-26 | 2021-04-20 | 深圳市通用测试系统有限公司 | 无线终端的无线性能测试方法及系统 |
CN113645684B (zh) * | 2020-05-11 | 2023-07-04 | 大唐移动通信设备有限公司 | 一种下行功率自适应分配方法、设备、装置和存储介质 |
Family Cites Families (408)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4736371A (en) * | 1985-12-30 | 1988-04-05 | Nec Corporation | Satellite communications system with random multiple access and time slot reservation |
US4750198A (en) * | 1986-12-12 | 1988-06-07 | Astronet Corporation/Plessey U.K. | Cellular radiotelephone system providing diverse separately-accessible groups of channels |
US4797879A (en) * | 1987-06-05 | 1989-01-10 | American Telephone And Telegraph Company At&T Bell Laboratories | Packet switched interconnection protocols for a star configured optical lan |
IT1250515B (it) | 1991-10-07 | 1995-04-08 | Sixtel Spa | Rete per area locale senza fili. |
US5241544A (en) | 1991-11-01 | 1993-08-31 | Motorola, Inc. | Multi-channel tdm communication system slot phase correction |
US5592490A (en) | 1991-12-12 | 1997-01-07 | Arraycomm, Inc. | Spectrally efficient high capacity wireless communication systems |
US6850252B1 (en) * | 1999-10-05 | 2005-02-01 | Steven M. Hoffberg | Intelligent electronic appliance system and method |
US5295159A (en) * | 1992-04-17 | 1994-03-15 | Bell Communications Research, Inc. | Coordinated coding for digital transmission |
RU2015281C1 (ru) | 1992-09-22 | 1994-06-30 | Борис Михайлович Кондрашов | Запорное устройство |
US5404355A (en) * | 1992-10-05 | 1995-04-04 | Ericsson Ge Mobile Communications, Inc. | Method for transmitting broadcast information in a digital control channel |
GB2300337B (en) | 1992-10-05 | 1997-03-26 | Ericsson Ge Mobile Communicat | Digital control channel |
US5471647A (en) | 1993-04-14 | 1995-11-28 | The Leland Stanford Junior University | Method for minimizing cross-talk in adaptive transmission antennas |
US5479447A (en) | 1993-05-03 | 1995-12-26 | The Board Of Trustees Of The Leland Stanford, Junior University | Method and apparatus for adaptive, variable bandwidth, high-speed data transmission of a multicarrier signal over digital subscriber lines |
US5483667A (en) | 1993-07-08 | 1996-01-09 | Northern Telecom Limited | Frequency plan for a cellular network |
DE69423546T2 (de) * | 1993-07-09 | 2000-09-21 | Koninkl Philips Electronics Nv | Telekommunikationsnetzwerk, Hauptstation und Nebenstation zum Gebrauch in solchem Netzwerk |
US5506861A (en) * | 1993-11-22 | 1996-04-09 | Ericsson Ge Mobile Comminications Inc. | System and method for joint demodulation of CDMA signals |
US5493712A (en) * | 1994-03-23 | 1996-02-20 | At&T Corp. | Fast AGC for TDMA radio systems |
WO1995030316A1 (en) | 1994-05-02 | 1995-11-09 | Motorola Inc. | Multiple subchannel flexible protocol method and apparatus |
US5677909A (en) | 1994-05-11 | 1997-10-14 | Spectrix Corporation | Apparatus for exchanging data between a central station and a plurality of wireless remote stations on a time divided commnication channel |
US6157343A (en) * | 1996-09-09 | 2000-12-05 | Telefonaktiebolaget Lm Ericsson | Antenna array calibration |
DE4425713C1 (de) | 1994-07-20 | 1995-04-20 | Inst Rundfunktechnik Gmbh | Verfahren zur Vielträger Modulation und Demodulation von digital codierten Daten |
FR2724084B1 (fr) | 1994-08-31 | 1997-01-03 | Alcatel Mobile Comm France | Systeme de transmission d'informations par un canal de transmission variant dans le temps, et equipements d'emission et de reception correspondants |
MY120873A (en) | 1994-09-30 | 2005-12-30 | Qualcomm Inc | Multipath search processor for a spread spectrum multiple access communication system |
US5710768A (en) | 1994-09-30 | 1998-01-20 | Qualcomm Incorporated | Method of searching for a bursty signal |
JPH08274756A (ja) | 1995-03-30 | 1996-10-18 | Toshiba Corp | 無線通信システム |
KR0155818B1 (ko) | 1995-04-29 | 1998-11-16 | 김광호 | 다중 반송파 전송시스템에서 적응형 전력 분배 방법 및 장치 |
US5606729A (en) * | 1995-06-21 | 1997-02-25 | Motorola, Inc. | Method and apparatus for implementing a received signal quality measurement in a radio communication system |
US5729542A (en) * | 1995-06-28 | 1998-03-17 | Motorola, Inc. | Method and apparatus for communication system access |
US7929498B2 (en) * | 1995-06-30 | 2011-04-19 | Interdigital Technology Corporation | Adaptive forward power control and adaptive reverse power control for spread-spectrum communications |
US5638369A (en) * | 1995-07-05 | 1997-06-10 | Motorola, Inc. | Method and apparatus for inbound channel selection in a communication system |
DE69535033T2 (de) | 1995-07-11 | 2007-03-08 | Alcatel | Zuweisung von Kapazität bei OFDM |
GB9514659D0 (en) | 1995-07-18 | 1995-09-13 | Northern Telecom Ltd | An antenna downlink beamsteering arrangement |
US5867539A (en) * | 1995-07-21 | 1999-02-02 | Hitachi America, Ltd. | Methods and apparatus for reducing the effect of impulse noise on receivers |
JP2802255B2 (ja) | 1995-09-06 | 1998-09-24 | 株式会社次世代デジタルテレビジョン放送システム研究所 | 直交周波数分割多重伝送方式及びそれを用いる送信装置と受信装置 |
GB9521739D0 (en) | 1995-10-24 | 1996-01-03 | Nat Transcommunications Ltd | Decoding carriers encoded using orthogonal frequency division multiplexing |
US5699365A (en) | 1996-03-27 | 1997-12-16 | Motorola, Inc. | Apparatus and method for adaptive forward error correction in data communications |
US5924015A (en) | 1996-04-30 | 1999-07-13 | Trw Inc | Power control method and apparatus for satellite based telecommunications system |
JPH09307526A (ja) | 1996-05-17 | 1997-11-28 | Mitsubishi Electric Corp | デジタル放送受信機 |
DE69705356T2 (de) | 1996-05-17 | 2002-05-02 | Motorola Ltd | Verfahren und Vorrichtung zur Gewichtung eines Uebertragungsweges |
FI101920B1 (fi) | 1996-06-07 | 1998-09-15 | Nokia Telecommunications Oy | Kanavanvarausmenetelmä pakettiverkkoa varten |
US5822374A (en) | 1996-06-07 | 1998-10-13 | Motorola, Inc. | Method for fine gains adjustment in an ADSL communications system |
US6798735B1 (en) | 1996-06-12 | 2004-09-28 | Aware, Inc. | Adaptive allocation for variable bandwidth multicarrier communication |
US6072779A (en) * | 1997-06-12 | 2000-06-06 | Aware, Inc. | Adaptive allocation for variable bandwidth multicarrier communication |
US6097771A (en) | 1996-07-01 | 2000-08-01 | Lucent Technologies Inc. | Wireless communications system having a layered space-time architecture employing multi-element antennas |
CA2302289C (en) | 1996-08-29 | 2005-11-08 | Gregory G. Raleigh | Spatio-temporal processing for communication |
JP2001359152A (ja) | 2000-06-14 | 2001-12-26 | Sony Corp | 無線通信システム、無線基地局装置、無線移動局装置、無線ゾーン割当て方法及び無線通信方法 |
US6275543B1 (en) | 1996-10-11 | 2001-08-14 | Arraycomm, Inc. | Method for reference signal generation in the presence of frequency offsets in a communications station with spatial processing |
US5886988A (en) * | 1996-10-23 | 1999-03-23 | Arraycomm, Inc. | Channel assignment and call admission control for spatial division multiple access communication systems |
US6049548A (en) * | 1996-11-22 | 2000-04-11 | Stanford Telecommunications, Inc. | Multi-access CS-P/CD-E system and protocols on satellite channels applicable to a group of mobile users in close proximity |
EP0948847A1 (en) | 1996-11-26 | 1999-10-13 | TRW Inc. | Cochannel signal processing system |
US6232918B1 (en) * | 1997-01-08 | 2001-05-15 | Us Wireless Corporation | Antenna array calibration in wireless communication systems |
JPH10209956A (ja) | 1997-01-28 | 1998-08-07 | Nippon Telegr & Teleph Corp <Ntt> | 無線パケット通信方法 |
JPH10303794A (ja) | 1997-02-27 | 1998-11-13 | Mitsubishi Electric Corp | 既知系列検出器 |
US6084915A (en) | 1997-03-03 | 2000-07-04 | 3Com Corporation | Signaling method having mixed-base shell map indices |
US6175550B1 (en) | 1997-04-01 | 2001-01-16 | Lucent Technologies, Inc. | Orthogonal frequency division multiplexing system with dynamically scalable operating parameters and method thereof |
KR100267856B1 (ko) | 1997-04-16 | 2000-10-16 | 윤종용 | 이동통신시스템에서오버헤드채널관리방법및장치 |
US6308080B1 (en) | 1997-05-16 | 2001-10-23 | Texas Instruments Incorporated | Power control in point-to-multipoint systems |
FR2764143A1 (fr) | 1997-05-27 | 1998-12-04 | Philips Electronics Nv | Procede de determination d'un format d'emission de symboles dans un systeme de transmission et systeme |
US5867478A (en) * | 1997-06-20 | 1999-02-02 | Motorola, Inc. | Synchronous coherent orthogonal frequency division multiplexing system, method, software and device |
US6067458A (en) | 1997-07-01 | 2000-05-23 | Qualcomm Incorporated | Method and apparatus for pre-transmission power control using lower rate for high rate communication |
US6333953B1 (en) | 1997-07-21 | 2001-12-25 | Ericsson Inc. | System and methods for selecting an appropriate detection technique in a radiocommunication system |
EP0895387A1 (de) | 1997-07-28 | 1999-02-03 | Deutsche Thomson-Brandt Gmbh | Erkennung des Übertragungsmodus eines DVB-Signales |
US6141542A (en) | 1997-07-31 | 2000-10-31 | Motorola, Inc. | Method and apparatus for controlling transmit diversity in a communication system |
CN1086061C (zh) | 1997-08-12 | 2002-06-05 | 鸿海精密工业股份有限公司 | 电连接器的固持装置 |
US6131016A (en) | 1997-08-27 | 2000-10-10 | At&T Corp | Method and apparatus for enhancing communication reception at a wireless communication terminal |
JP2991167B2 (ja) | 1997-08-27 | 1999-12-20 | 三菱電機株式会社 | Tdma可変スロット割当方法 |
EP0899896A1 (de) | 1997-08-27 | 1999-03-03 | Siemens Aktiengesellschaft | Verfahren und Einrichtung zur Schätzung räumlicher Parameter von Überstragungskanälen |
US6167031A (en) * | 1997-08-29 | 2000-12-26 | Telefonaktiebolaget Lm Ericsson (Publ) | Method for selecting a combination of modulation and channel coding schemes in a digital communication system |
US6590928B1 (en) | 1997-09-17 | 2003-07-08 | Telefonaktiebolaget Lm Ericsson (Publ) | Frequency hopping piconets in an uncoordinated wireless multi-user system |
AUPO932297A0 (en) | 1997-09-19 | 1997-10-09 | Commonwealth Scientific And Industrial Research Organisation | Medium access control protocol for data communications |
KR100234329B1 (ko) | 1997-09-30 | 1999-12-15 | 윤종용 | Ofdm 시스템 수신기의 fft 윈도우 위치 복원장치 및 그 방법_ |
US6178196B1 (en) * | 1997-10-06 | 2001-01-23 | At&T Corp. | Combined interference cancellation and maximum likelihood decoding of space-time block codes |
US6574211B2 (en) * | 1997-11-03 | 2003-06-03 | Qualcomm Incorporated | Method and apparatus for high rate packet data transmission |
US6377812B1 (en) | 1997-11-20 | 2002-04-23 | University Of Maryland | Combined power control and space-time diversity in mobile cellular communications |
US6122247A (en) | 1997-11-24 | 2000-09-19 | Motorola Inc. | Method for reallocating data in a discrete multi-tone communication system |
JPH11163823A (ja) | 1997-11-26 | 1999-06-18 | Victor Co Of Japan Ltd | 直交周波数分割多重信号伝送方法、送信装置及び受信装置 |
US6084917A (en) * | 1997-12-16 | 2000-07-04 | Integrated Telecom Express | Circuit for configuring and dynamically adapting data and energy parameters in a multi-channel communications system |
US6088387A (en) | 1997-12-31 | 2000-07-11 | At&T Corp. | Multi-channel parallel/serial concatenated convolutional codes and trellis coded modulation encoder/decoder |
EP2254301B1 (en) | 1998-01-06 | 2013-06-19 | Mosaid Technologies Incorporated | Multicarrier modulation system with variable symbol rates |
US6608874B1 (en) | 1998-01-12 | 2003-08-19 | Hughes Electronics Corporation | Method and apparatus for quadrature multi-pulse modulation of data for spectrally efficient communication |
US5982327A (en) | 1998-01-12 | 1999-11-09 | Motorola, Inc. | Adaptive array method, device, base station and subscriber unit |
US5973638A (en) | 1998-01-30 | 1999-10-26 | Micronetics Wireless, Inc. | Smart antenna channel simulator and test system |
EP0938208A1 (en) * | 1998-02-22 | 1999-08-25 | Sony International (Europe) GmbH | Multicarrier transmission, compatible with the existing GSM system |
WO1999044379A1 (en) | 1998-02-27 | 1999-09-02 | Telefonaktiebolaget Lm Ericsson (Publ) | Multiple access categorization for mobile station |
JP3082756B2 (ja) | 1998-02-27 | 2000-08-28 | 日本電気株式会社 | マルチキャリア伝送システム及びその方法 |
US6141388A (en) | 1998-03-11 | 2000-10-31 | Ericsson Inc. | Received signal quality determination method and systems for convolutionally encoded communication channels |
US6317466B1 (en) | 1998-04-15 | 2001-11-13 | Lucent Technologies Inc. | Wireless communications system having a space-time architecture employing multi-element antennas at both the transmitter and receiver |
US6615024B1 (en) | 1998-05-01 | 2003-09-02 | Arraycomm, Inc. | Method and apparatus for determining signatures for calibrating a communication station having an antenna array |
US7123628B1 (en) | 1998-05-06 | 2006-10-17 | Lg Electronics Inc. | Communication system with improved medium access control sub-layer |
US6205410B1 (en) * | 1998-06-01 | 2001-03-20 | Globespan Semiconductor, Inc. | System and method for bit loading with optimal margin assignment |
US6795424B1 (en) | 1998-06-30 | 2004-09-21 | Tellabs Operations, Inc. | Method and apparatus for interference suppression in orthogonal frequency division multiplexed (OFDM) wireless communication systems |
JP2000092009A (ja) | 1998-07-13 | 2000-03-31 | Sony Corp | 通信方法、送信機及び受信機 |
WO2000004728A2 (en) * | 1998-07-16 | 2000-01-27 | Samsung Electronics Co., Ltd. | Processing packet data in mobile communication system |
US6154443A (en) | 1998-08-11 | 2000-11-28 | Industrial Technology Research Institute | FFT-based CDMA RAKE receiver system and method |
MXPA01001753A (es) | 1998-08-18 | 2002-06-04 | Beamreach Networks Inc | Tecnologia de comunicacion multitono de separacion de portadora apilada. |
KR100429540B1 (ko) | 1998-08-26 | 2004-08-09 | 삼성전자주식회사 | 이동통신시스템의패킷데이터통신장치및방법 |
US6515617B1 (en) * | 1998-09-01 | 2003-02-04 | Hughes Electronics Corporation | Method and system for position determination using geostationary earth orbit satellite |
DE19842712C1 (de) * | 1998-09-17 | 2000-05-04 | Siemens Ag | Verfahren und Anordnung zur Minimierung des Autokorrelationsfehlers bei der Demodulation eines Spreizspektrum-Signals unter Mehrwegeausbreitung |
US6292917B1 (en) | 1998-09-30 | 2001-09-18 | Agere Systems Guardian Corp. | Unequal error protection for digital broadcasting using channel classification |
DE69828608T2 (de) | 1998-10-05 | 2005-12-29 | Sony International (Europe) Gmbh | Aufteilungsschema für ein Zufallszugriffskanal in einem CDMA System |
EP0993212B1 (en) | 1998-10-05 | 2006-05-24 | Sony Deutschland GmbH | Random access channel partitioning scheme for CDMA system |
EP1108317B1 (de) * | 1998-10-27 | 2002-08-28 | Siemens Aktiengesellschaft | Kanalzuweisungsverfahren und vorrichtung für kodierte und kombinierte informationssätze |
JP4287536B2 (ja) | 1998-11-06 | 2009-07-01 | パナソニック株式会社 | Ofdm送受信装置及びofdm送受信方法 |
ES2185244T3 (es) | 1998-12-03 | 2003-04-16 | Fraunhofer Ges Forschung | Aparato y procedimiento para transmitir informacion y aparato y procedimiento para recibir informacion. |
GB9827182D0 (en) * | 1998-12-10 | 1999-02-03 | Philips Electronics Nv | Radio communication system |
FI108588B (fi) | 1998-12-15 | 2002-02-15 | Nokia Corp | Menetelmä ja radiojärjestelmä digitaalisen signaalin siirtoon |
JP2000244441A (ja) | 1998-12-22 | 2000-09-08 | Matsushita Electric Ind Co Ltd | Ofdm送受信装置 |
US6266528B1 (en) | 1998-12-23 | 2001-07-24 | Arraycomm, Inc. | Performance monitor for antenna arrays |
US6310909B1 (en) * | 1998-12-23 | 2001-10-30 | Broadcom Corporation | DSL rate adaptation |
US6463290B1 (en) | 1999-01-08 | 2002-10-08 | Trueposition, Inc. | Mobile-assisted network based techniques for improving accuracy of wireless location system |
US6348036B1 (en) * | 1999-01-24 | 2002-02-19 | Genzyme Corporation | Surgical retractor and tissue stabilization device |
RU2152132C1 (ru) | 1999-01-26 | 2000-06-27 | Государственное унитарное предприятие Воронежский научно-исследовательский институт связи | Линия радиосвязи с пространственной модуляцией |
JP3619729B2 (ja) | 2000-01-19 | 2005-02-16 | 松下電器産業株式会社 | 無線受信装置および無線受信方法 |
KR100651457B1 (ko) | 1999-02-13 | 2006-11-28 | 삼성전자주식회사 | 부호분할다중접속 이동통신시스템의 불연속 전송모드에서 연속적인 외부순환 전력제어장치 및 방법 |
US6574267B1 (en) * | 1999-03-22 | 2003-06-03 | Golden Bridge Technology, Inc. | Rach ramp-up acknowledgement |
US6363267B1 (en) | 1999-04-07 | 2002-03-26 | Telefonaktiebolaget Lm Ericsson (Publ) | Mobile terminal decode failure procedure in a wireless local area network |
US6346910B1 (en) | 1999-04-07 | 2002-02-12 | Tei Ito | Automatic array calibration scheme for wireless point-to-multipoint communication networks |
EP1075093A1 (en) | 1999-08-02 | 2001-02-07 | Interuniversitair Micro-Elektronica Centrum Vzw | A method and apparatus for multi-user transmission |
US6532562B1 (en) * | 1999-05-21 | 2003-03-11 | Microsoft Corp | Receiver-driven layered error correction multicast over heterogeneous packet networks |
US6594798B1 (en) | 1999-05-21 | 2003-07-15 | Microsoft Corporation | Receiver-driven layered error correction multicast over heterogeneous packet networks |
US6594473B1 (en) | 1999-05-28 | 2003-07-15 | Texas Instruments Incorporated | Wireless system with transmitter having multiple transmit antennas and combining open loop and closed loop transmit diversities |
KR100605978B1 (ko) | 1999-05-29 | 2006-07-28 | 삼성전자주식회사 | 부호분할다중접속 이동통신시스템의 불연속 전송모드에서 연속적인 외부순환 전력제어를 위한 송수신 장치 및 방법 |
US7072410B1 (en) | 1999-06-01 | 2006-07-04 | Peter Monsen | Multiple access system and method for multibeam digital radio systems |
US6141567A (en) | 1999-06-07 | 2000-10-31 | Arraycomm, Inc. | Apparatus and method for beamforming in a changing-interference environment |
US6385264B1 (en) | 1999-06-08 | 2002-05-07 | Qualcomm Incorporated | Method and apparatus for mitigating interference between base stations in a wideband CDMA system |
US6976262B1 (en) | 1999-06-14 | 2005-12-13 | Sun Microsystems, Inc. | Web-based enterprise management with multiple repository capability |
DE60017867T2 (de) | 1999-07-08 | 2005-06-23 | Samsung Electronics Co., Ltd., Suwon | Detektionsgerät und -verfahren für datenrate in einer mobilen kommunikationsanordnung |
US6163296A (en) | 1999-07-12 | 2000-12-19 | Lockheed Martin Corp. | Calibration and integrated beam control/conditioning system for phased-array antennas |
RU2168278C2 (ru) | 1999-07-16 | 2001-05-27 | Корпорация "Самсунг Электроникс" | Способ произвольного доступа абонентов мобильной станции |
US6532225B1 (en) * | 1999-07-27 | 2003-03-11 | At&T Corp | Medium access control layer for packetized wireless systems |
JP2001044930A (ja) | 1999-07-30 | 2001-02-16 | Matsushita Electric Ind Co Ltd | 無線通信装置および無線通信方法 |
US6735188B1 (en) | 1999-08-27 | 2004-05-11 | Tachyon, Inc. | Channel encoding and decoding method and apparatus |
US6278726B1 (en) * | 1999-09-10 | 2001-08-21 | Interdigital Technology Corporation | Interference cancellation in a spread spectrum communication system |
US6115406A (en) | 1999-09-10 | 2000-09-05 | Interdigital Technology Corporation | Transmission using an antenna array in a CDMA communication system |
US6426971B1 (en) | 1999-09-13 | 2002-07-30 | Qualcomm Incorporated | System and method for accurately predicting signal to interference and noise ratio to improve communications system performance |
SG80071A1 (en) | 1999-09-24 | 2001-04-17 | Univ Singapore | Downlink beamforming method |
DE19951525C2 (de) | 1999-10-26 | 2002-01-24 | Siemens Ag | Verfahren zum Kalibrieren einer elektronisch phasengesteuerten Gruppenantenne in Funk-Kommunikationssystemen |
US6492942B1 (en) | 1999-11-09 | 2002-12-10 | Com Dev International, Inc. | Content-based adaptive parasitic array antenna system |
US7088671B1 (en) | 1999-11-24 | 2006-08-08 | Peter Monsen | Multiple access technique for downlink multibeam digital radio systems |
US7110785B1 (en) | 1999-12-03 | 2006-09-19 | Nortel Networks Limited | Performing power control in a mobile communications system |
EP1109326A1 (en) | 1999-12-15 | 2001-06-20 | Lucent Technologies Inc. | Peamble detector for a CDMA receiver |
US6351499B1 (en) | 1999-12-15 | 2002-02-26 | Iospan Wireless, Inc. | Method and wireless systems using multiple antennas and adaptive control for maximizing a communication parameter |
US6298092B1 (en) | 1999-12-15 | 2001-10-02 | Iospan Wireless, Inc. | Methods of controlling communication parameters of wireless systems |
JP3975629B2 (ja) | 1999-12-16 | 2007-09-12 | ソニー株式会社 | 画像復号装置及び画像復号方法 |
US6298035B1 (en) | 1999-12-21 | 2001-10-02 | Nokia Networks Oy | Estimation of two propagation channels in OFDM |
JP2001186051A (ja) | 1999-12-24 | 2001-07-06 | Toshiba Corp | データ信号判定回路及び方法 |
AU755728B2 (en) | 1999-12-28 | 2002-12-19 | Ntt Docomo, Inc. | Path search method, channel estimating method and communications device |
US6718160B2 (en) | 1999-12-29 | 2004-04-06 | Airnet Communications Corp. | Automatic configuration of backhaul and groundlink frequencies in a wireless repeater |
US6888809B1 (en) * | 2000-01-13 | 2005-05-03 | Lucent Technologies Inc. | Space-time processing for multiple-input, multiple-output, wireless systems |
US7254171B2 (en) | 2000-01-20 | 2007-08-07 | Nortel Networks Limited | Equaliser for digital communications systems and method of equalisation |
JP2001217896A (ja) | 2000-01-31 | 2001-08-10 | Matsushita Electric Works Ltd | 無線データ通信システム |
FI117465B (fi) | 2000-02-03 | 2006-10-31 | Danisco Sweeteners Oy | Menetelmä pureskeltavien ytimien kovapinnoittamiseksi |
US6868120B2 (en) * | 2000-02-08 | 2005-03-15 | Clearwire Corporation | Real-time system for measuring the Ricean K-factor |
US6704374B1 (en) | 2000-02-16 | 2004-03-09 | Thomson Licensing S.A. | Local oscillator frequency correction in an orthogonal frequency division multiplexing system |
DE10008653A1 (de) * | 2000-02-24 | 2001-09-06 | Siemens Ag | Verbesserungen an einem Funkkommunikationssystem |
US6956814B1 (en) | 2000-02-29 | 2005-10-18 | Worldspace Corporation | Method and apparatus for mobile platform reception and synchronization in direct digital satellite broadcast system |
JP2001244879A (ja) | 2000-03-02 | 2001-09-07 | Matsushita Electric Ind Co Ltd | 送信電力制御装置及びその方法 |
EP1137217A1 (en) | 2000-03-20 | 2001-09-26 | Telefonaktiebolaget Lm Ericsson | ARQ parameter negociation in a data packet transmission system using link adaptation |
US6473467B1 (en) | 2000-03-22 | 2002-10-29 | Qualcomm Incorporated | Method and apparatus for measuring reporting channel state information in a high efficiency, high performance communications system |
US20020154705A1 (en) | 2000-03-22 | 2002-10-24 | Walton Jay R. | High efficiency high performance communications system employing multi-carrier modulation |
US6952454B1 (en) | 2000-03-22 | 2005-10-04 | Qualcomm, Incorporated | Multiplexing of real time services and non-real time services for OFDM systems |
DE10014676C2 (de) | 2000-03-24 | 2002-02-07 | Polytrax Inf Technology Ag | Datenübertragung über ein Stromversorgungsnetz |
US7113499B2 (en) | 2000-03-29 | 2006-09-26 | Texas Instruments Incorporated | Wireless communication |
EP1843622B1 (en) | 2000-04-04 | 2009-12-30 | Sony Deutschland Gmbh | Event triggered change of access service class in a random access channel |
ATE301350T1 (de) | 2000-04-07 | 2005-08-15 | Nokia Corp | Verfahren und vorrichtung zur übertragung mit mehreren antennen |
US7289570B2 (en) | 2000-04-10 | 2007-10-30 | Texas Instruments Incorporated | Wireless communications |
US6757263B1 (en) | 2000-04-13 | 2004-06-29 | Motorola, Inc. | Wireless repeating subscriber units |
EP1830535B1 (en) * | 2000-04-18 | 2011-06-15 | Aware, Inc. | Multicarrier system with a plurality of SNR margins |
US6751199B1 (en) | 2000-04-24 | 2004-06-15 | Qualcomm Incorporated | Method and apparatus for a rate control in a high data rate communication system |
DE60024502T2 (de) | 2000-04-25 | 2006-08-24 | Nortel Networks Ltd., St. Laurent | Drahtloses Telekommunikationssystem mit einer reduzierten Verzögerung für die Datenübermittlung |
JP3414357B2 (ja) | 2000-04-25 | 2003-06-09 | 日本電気株式会社 | Cdma移動通信システムにおける送信電力制御方式 |
US7068628B2 (en) | 2000-05-22 | 2006-06-27 | At&T Corp. | MIMO OFDM system |
US7139324B1 (en) | 2000-06-02 | 2006-11-21 | Nokia Networks Oy | Closed loop feedback system for improved down link performance |
EP1198908B1 (en) | 2000-06-12 | 2017-08-09 | Samsung Electronics Co., Ltd. | Method of assigning an uplink random access channel in a cdma mobile communication system |
US6744811B1 (en) | 2000-06-12 | 2004-06-01 | Actelis Networks Inc. | Bandwidth management for DSL modem pool |
US7248841B2 (en) | 2000-06-13 | 2007-07-24 | Agee Brian G | Method and apparatus for optimization of wireless multipoint electromagnetic communication networks |
US6760313B1 (en) | 2000-06-19 | 2004-07-06 | Qualcomm Incorporated | Method and apparatus for adaptive rate selection in a communication system |
SE519303C2 (sv) * | 2000-06-20 | 2003-02-11 | Ericsson Telefon Ab L M | Anordning för smalbandig kommunikation i ett multicarrier- system |
US6891858B1 (en) * | 2000-06-30 | 2005-05-10 | Cisco Technology Inc. | Dynamic modulation of modulation profiles for communication channels in an access network |
CN1140147C (zh) * | 2000-07-01 | 2004-02-25 | 信息产业部电信传输研究所 | 一种外环功率控制的方法和系统 |
EP1209824B1 (en) * | 2000-07-03 | 2006-02-15 | Matsushita Electric Industrial Co., Ltd. | Base station unit and method for radio communication |
EP2262151B1 (en) * | 2000-07-05 | 2017-10-04 | Sony Deutschland Gmbh | Pilot pattern design for multiple antennas in an OFDM system |
FI109393B (fi) | 2000-07-14 | 2002-07-15 | Nokia Corp | Menetelmä mediavirran enkoodaamiseksi skaalautuvasti, skaalautuva enkooderi ja päätelaite |
AU2001270623A1 (en) | 2000-07-17 | 2002-01-30 | Koninklijke Philips Electronics N.V. | Coding of data stream |
KR100493152B1 (ko) | 2000-07-21 | 2005-06-02 | 삼성전자주식회사 | 이동 통신 시스템에서의 전송 안테나 다이버시티 방법 및이를 위한 기지국 장치 및 이동국 장치 |
EP1176750A1 (en) | 2000-07-25 | 2002-01-30 | Telefonaktiebolaget L M Ericsson (Publ) | Link quality determination of a transmission link in an OFDM transmission system |
DE60035683T2 (de) | 2000-08-01 | 2008-06-26 | Sony Deutschland Gmbh | Frequenzwiederverwendungsschema für OFDM-Systeme |
US6920192B1 (en) | 2000-08-03 | 2005-07-19 | Lucent Technologies Inc. | Adaptive antenna array methods and apparatus for use in a multi-access wireless communication system |
EP1612966B1 (en) | 2000-08-10 | 2007-12-12 | Fujitsu Limited | Transmitting diversity communications apparatus |
US6582088B2 (en) * | 2000-08-10 | 2003-06-24 | Benq Corporation | Optical path folding apparatus |
KR100526499B1 (ko) * | 2000-08-22 | 2005-11-08 | 삼성전자주식회사 | 두 개 이상 안테나를 사용하는 안테나 전송 다이버시티방법 및 장치 |
EP1182799A3 (en) | 2000-08-22 | 2002-06-26 | Lucent Technologies Inc. | Method for enhancing mobile cdma communications using space-time transmit diversity |
IT1318790B1 (it) | 2000-08-29 | 2003-09-10 | Cit Alcatel | Metodo per gestire il cambio di allocazione dei time-slot in reti adanello ms-spring di tipo transoceanico. |
US6937592B1 (en) | 2000-09-01 | 2005-08-30 | Intel Corporation | Wireless communications system that supports multiple modes of operation |
US6850481B2 (en) | 2000-09-01 | 2005-02-01 | Nortel Networks Limited | Channels estimation for multiple input—multiple output, orthogonal frequency division multiplexing (OFDM) system |
US6985434B2 (en) * | 2000-09-01 | 2006-01-10 | Nortel Networks Limited | Adaptive time diversity and spatial diversity for OFDM |
US7009931B2 (en) * | 2000-09-01 | 2006-03-07 | Nortel Networks Limited | Synchronization in a multiple-input/multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) system for wireless applications |
US7233625B2 (en) | 2000-09-01 | 2007-06-19 | Nortel Networks Limited | Preamble design for multiple input—multiple output (MIMO), orthogonal frequency division multiplexing (OFDM) system |
FR2814014B1 (fr) * | 2000-09-14 | 2002-10-11 | Mitsubishi Electric Inf Tech | Methode de detection multi-utilisateur |
US6760882B1 (en) * | 2000-09-19 | 2004-07-06 | Intel Corporation | Mode selection for data transmission in wireless communication channels based on statistical parameters |
US6802035B2 (en) | 2000-09-19 | 2004-10-05 | Intel Corporation | System and method of dynamically optimizing a transmission mode of wirelessly transmitted information |
US7062294B1 (en) | 2000-09-29 | 2006-06-13 | Arraycomm, Llc. | Downlink transmission in a wireless data communication system having a base station with a smart antenna system |
US7110378B2 (en) * | 2000-10-03 | 2006-09-19 | Wisconsin Alumni Research Foundation | Channel aware optimal space-time signaling for wireless communication over wideband multipath channels |
US7016296B2 (en) * | 2000-10-16 | 2006-03-21 | Broadcom Corporation | Adaptive modulation for fixed wireless link in cable transmission system |
JP3553038B2 (ja) | 2000-11-06 | 2004-08-11 | 株式会社エヌ・ティ・ティ・ドコモ | 信号送信方法、信号受信方法、送信装置、受信装置および記録媒体 |
US6768727B1 (en) | 2000-11-09 | 2004-07-27 | Ericsson Inc. | Fast forward link power control for CDMA system |
US8634481B1 (en) | 2000-11-16 | 2014-01-21 | Alcatel Lucent | Feedback technique for wireless systems with multiple transmit and receive antennas |
US6980601B2 (en) | 2000-11-17 | 2005-12-27 | Broadcom Corporation | Rate adaptation and parameter optimization for multi-band single carrier transmission |
US7006464B1 (en) * | 2000-11-17 | 2006-02-28 | Lucent Technologies Inc. | Downlink and uplink channel structures for downlink shared channel system |
JP3695316B2 (ja) | 2000-11-24 | 2005-09-14 | 株式会社日本自動車部品総合研究所 | スペクトラム拡散受信機の相関検出器 |
US6751480B2 (en) | 2000-12-01 | 2004-06-15 | Lucent Technologies Inc. | Method for simultaneously conveying information to multiple mobiles with multiple antennas |
JP4505677B2 (ja) | 2000-12-06 | 2010-07-21 | ソフトバンクテレコム株式会社 | 送信ダイバーシチ装置および送信電力調整方法 |
US6952426B2 (en) | 2000-12-07 | 2005-10-04 | Nortel Networks Limited | Method and apparatus for the transmission of short data bursts in CDMA/HDR networks |
KR100353641B1 (ko) | 2000-12-21 | 2002-09-28 | 삼성전자 주식회사 | 부호분할다중접속 이동통신시스템의 기지국 전송 안테나다이버시티 장치 및 방법 |
US6850498B2 (en) * | 2000-12-22 | 2005-02-01 | Intel Corporation | Method and system for evaluating a wireless link |
US6987819B2 (en) | 2000-12-29 | 2006-01-17 | Motorola, Inc. | Method and device for multiple input/multiple output transmit and receive weights for equal-rate data streams |
US20020085641A1 (en) | 2000-12-29 | 2002-07-04 | Motorola, Inc | Method and system for interference averaging in a wireless communication system |
US7050510B2 (en) | 2000-12-29 | 2006-05-23 | Lucent Technologies Inc. | Open-loop diversity technique for systems employing four transmitter antennas |
US6731668B2 (en) * | 2001-01-05 | 2004-05-04 | Qualcomm Incorporated | Method and system for increased bandwidth efficiency in multiple input—multiple output channels |
EP1223776A1 (en) * | 2001-01-12 | 2002-07-17 | Siemens Information and Communication Networks S.p.A. | A collision free access scheduling in cellular TDMA-CDMA networks |
US6693992B2 (en) * | 2001-01-16 | 2004-02-17 | Mindspeed Technologies | Line probe signal and method of use |
US6801790B2 (en) | 2001-01-17 | 2004-10-05 | Lucent Technologies Inc. | Structure for multiple antenna configurations |
US7164669B2 (en) | 2001-01-19 | 2007-01-16 | Adaptix, Inc. | Multi-carrier communication with time division multiplexing and carrier-selective loading |
US7054662B2 (en) | 2001-01-24 | 2006-05-30 | Qualcomm, Inc. | Method and system for forward link beam forming in wireless communications |
JP2002232943A (ja) | 2001-01-29 | 2002-08-16 | Sony Corp | データ送信処理方法、データ受信処理方法、送信機、受信機、およびセルラー無線通信システム |
GB0102316D0 (en) * | 2001-01-30 | 2001-03-14 | Koninkl Philips Electronics Nv | Radio communication system |
US6961388B2 (en) | 2001-02-01 | 2005-11-01 | Qualcomm, Incorporated | Coding scheme for a wireless communication system |
US6885654B2 (en) * | 2001-02-06 | 2005-04-26 | Interdigital Technology Corporation | Low complexity data detection using fast fourier transform of channel correlation matrix |
US6975868B2 (en) | 2001-02-21 | 2005-12-13 | Qualcomm Incorporated | Method and apparatus for IS-95B reverse link supplemental code channel frame validation and fundamental code channel rate decision improvement |
US7006483B2 (en) * | 2001-02-23 | 2006-02-28 | Ipr Licensing, Inc. | Qualifying available reverse link coding rates from access channel power setting |
WO2002069523A1 (en) | 2001-02-26 | 2002-09-06 | Magnolia Broadband, Inc | Smart antenna based spectrum multiplexing using a pilot signal |
GB0105019D0 (en) | 2001-03-01 | 2001-04-18 | Koninkl Philips Electronics Nv | Antenna diversity in a wireless local area network |
US7039125B2 (en) * | 2001-03-12 | 2006-05-02 | Analog Devices, Inc. | Equalized SNR power back-off |
EP1241824A1 (en) | 2001-03-14 | 2002-09-18 | TELEFONAKTIEBOLAGET LM ERICSSON (publ) | Multiplexing method in a multicarrier transmit diversity system |
US6478422B1 (en) | 2001-03-19 | 2002-11-12 | Richard A. Hansen | Single bifocal custom shooters glasses |
US6771706B2 (en) | 2001-03-23 | 2004-08-03 | Qualcomm Incorporated | Method and apparatus for utilizing channel state information in a wireless communication system |
US7248638B1 (en) | 2001-03-23 | 2007-07-24 | Lsi Logic | Transmit antenna multi-mode tracking |
US7386076B2 (en) | 2001-03-29 | 2008-06-10 | Texas Instruments Incorporated | Space time encoded wireless communication system with multipath resolution receivers |
GB2373973B (en) | 2001-03-30 | 2003-06-11 | Toshiba Res Europ Ltd | Adaptive antenna |
US8290098B2 (en) * | 2001-03-30 | 2012-10-16 | Texas Instruments Incorporated | Closed loop multiple transmit, multiple receive antenna wireless communication system |
US20020176485A1 (en) | 2001-04-03 | 2002-11-28 | Hudson John E. | Multi-cast communication system and method of estimating channel impulse responses therein |
US6785513B1 (en) | 2001-04-05 | 2004-08-31 | Cowave Networks, Inc. | Method and system for clustered wireless networks |
US6859503B2 (en) | 2001-04-07 | 2005-02-22 | Motorola, Inc. | Method and system in a transceiver for controlling a multiple-input, multiple-output communications channel |
KR100510434B1 (ko) | 2001-04-09 | 2005-08-26 | 니폰덴신뎅와 가부시키가이샤 | Ofdm신호전달 시스템, ofdm신호 송신장치 및ofdm신호 수신장치 |
FR2823620B1 (fr) | 2001-04-12 | 2003-08-15 | France Telecom | Procede de codage/decodage d'un flux de donnees numeriques codees avec entrelacement sur bits en emission et en reception multiple en presence d'interference intersymboles et systeme correspondant |
US7310304B2 (en) | 2001-04-24 | 2007-12-18 | Bae Systems Information And Electronic Systems Integration Inc. | Estimating channel parameters in multi-input, multi-output (MIMO) systems |
US6611231B2 (en) | 2001-04-27 | 2003-08-26 | Vivato, Inc. | Wireless packet switched communication systems and networks using adaptively steered antenna arrays |
US7133459B2 (en) | 2001-05-01 | 2006-11-07 | Texas Instruments Incorporated | Space-time transmit diversity |
EP1255369A1 (en) * | 2001-05-04 | 2002-11-06 | TELEFONAKTIEBOLAGET LM ERICSSON (publ) | Link adaptation for wireless MIMO transmission schemes |
US7480278B2 (en) * | 2001-05-04 | 2009-01-20 | Nokia Corporation | Admission control with directional antenna |
DE10122788A1 (de) | 2001-05-10 | 2002-06-06 | Basf Ag | Verfahren der kristallisativen Reinigung einer Roh-Schmelze wenigstens eines Monomeren |
US6785341B2 (en) | 2001-05-11 | 2004-08-31 | Qualcomm Incorporated | Method and apparatus for processing data in a multiple-input multiple-output (MIMO) communication system utilizing channel state information |
US7688899B2 (en) | 2001-05-17 | 2010-03-30 | Qualcomm Incorporated | Method and apparatus for processing data for transmission in a multi-channel communication system using selective channel inversion |
US6718493B1 (en) | 2001-05-17 | 2004-04-06 | 3Com Corporation | Method and apparatus for selection of ARQ parameters and estimation of improved communications |
US7072413B2 (en) | 2001-05-17 | 2006-07-04 | Qualcomm, Incorporated | Method and apparatus for processing data for transmission in a multi-channel communication system using selective channel inversion |
US6751187B2 (en) * | 2001-05-17 | 2004-06-15 | Qualcomm Incorporated | Method and apparatus for processing data for transmission in a multi-channel communication system using selective channel transmission |
US7492737B1 (en) * | 2001-05-23 | 2009-02-17 | Nortel Networks Limited | Service-driven air interface protocol architecture for wireless systems |
ES2188373B1 (es) | 2001-05-25 | 2004-10-16 | Diseño De Sistemas En Silencio, S.A. | Procedimiento de optimizacion de la comunicacion para sistema de transmision digital ofdm multiusuario sobre red electrica. |
US6920194B2 (en) | 2001-05-29 | 2005-07-19 | Tioga Technologies, Ltd. | Method and system for detecting, timing, and correcting impulse noise |
US7158563B2 (en) | 2001-06-01 | 2007-01-02 | The Board Of Trustees Of The Leland Stanford Junior University | Dynamic digital communication system control |
US20020183010A1 (en) | 2001-06-05 | 2002-12-05 | Catreux Severine E. | Wireless communication systems with adaptive channelization and link adaptation |
GB2376315B (en) | 2001-06-05 | 2003-08-06 | 3Com Corp | Data bus system including posted reads and writes |
US7190749B2 (en) | 2001-06-06 | 2007-03-13 | Qualcomm Incorporated | Method and apparatus for canceling pilot interference in a wireless communication system |
US20020193146A1 (en) | 2001-06-06 | 2002-12-19 | Mark Wallace | Method and apparatus for antenna diversity in a wireless communication system |
EP1265411B1 (en) | 2001-06-08 | 2007-04-18 | Sony Deutschland GmbH | Multicarrier system with adaptive bit-wise interleaving |
US20030012308A1 (en) | 2001-06-13 | 2003-01-16 | Sampath Hemanth T. | Adaptive channel estimation for wireless systems |
US7027523B2 (en) * | 2001-06-22 | 2006-04-11 | Qualcomm Incorporated | Method and apparatus for transmitting data in a time division duplexed (TDD) communication system |
KR20040008230A (ko) | 2001-06-27 | 2004-01-28 | 노오텔 네트웍스 리미티드 | 무선 통신 시스템에서 제어 정보의 통신 |
US6751444B1 (en) * | 2001-07-02 | 2004-06-15 | Broadstorm Telecommunications, Inc. | Method and apparatus for adaptive carrier allocation and power control in multi-carrier communication systems |
FR2827731B1 (fr) | 2001-07-23 | 2004-01-23 | Nexo | Haut-parleur a radiation directe et rayonnement optimise |
US6996380B2 (en) | 2001-07-26 | 2006-02-07 | Ericsson Inc. | Communication system employing transmit macro-diversity |
US6738020B1 (en) * | 2001-07-31 | 2004-05-18 | Arraycomm, Inc. | Estimation of downlink transmission parameters in a radio communications system with an adaptive antenna array |
EP1284545B1 (en) | 2001-08-13 | 2008-07-02 | Motorola, Inc. | Transmit diversity wireless communication |
KR100703295B1 (ko) | 2001-08-18 | 2007-04-03 | 삼성전자주식회사 | 이동통신시스템에서 안테나 어레이를 이용한 데이터 송/수신 장치 및 방법 |
US20030039317A1 (en) * | 2001-08-21 | 2003-02-27 | Taylor Douglas Hamilton | Method and apparatus for constructing a sub-carrier map |
EP1289328A1 (en) * | 2001-08-28 | 2003-03-05 | Lucent Technologies Inc. | A method of sending control information in a wireless telecommunications network, and corresponding apparatus |
US6990059B1 (en) | 2001-09-05 | 2006-01-24 | Cisco Technology, Inc. | Interference mitigation in a wireless communication system |
US7149254B2 (en) * | 2001-09-06 | 2006-12-12 | Intel Corporation | Transmit signal preprocessing based on transmit antennae correlations for multiple antennae systems |
FR2829326A1 (fr) | 2001-09-06 | 2003-03-07 | France Telecom | Procede et systeme de reception iterative sous optimale pour systeme de transmission haut debit cdma |
US7133070B2 (en) | 2001-09-20 | 2006-11-07 | Eastman Kodak Company | System and method for deciding when to correct image-specific defects based on camera, scene, display and demographic data |
US6788948B2 (en) | 2001-09-28 | 2004-09-07 | Arraycomm, Inc. | Frequency dependent calibration of a wideband radio system using narrowband channels |
US7035359B2 (en) * | 2001-10-11 | 2006-04-25 | Telefonaktiebolaget L.M. Ericsson | Methods and apparatus for demodulation of a signal in a signal slot subject to a discontinuous interference signal |
US7548506B2 (en) | 2001-10-17 | 2009-06-16 | Nortel Networks Limited | System access and synchronization methods for MIMO OFDM communications systems and physical layer packet and preamble design |
US7773699B2 (en) | 2001-10-17 | 2010-08-10 | Nortel Networks Limited | Method and apparatus for channel quality measurements |
US7116652B2 (en) | 2001-10-18 | 2006-10-03 | Lucent Technologies Inc. | Rate control technique for layered architectures with multiple transmit and receive antennas |
US7349667B2 (en) | 2001-10-19 | 2008-03-25 | Texas Instruments Incorporated | Simplified noise estimation and/or beamforming for wireless communications |
KR20030032875A (ko) | 2001-10-19 | 2003-04-26 | 삼성전자주식회사 | 멀티캐스트 멀티미디어 방송 서비스를 제공하는 이동 통신시스템에서 순방향 데이터 채널 송신 전력을 제어하는장치 및 방법 |
US7130592B2 (en) | 2001-10-31 | 2006-10-31 | Matsushita Electric Industrial Co., Ltd. | Radio transmission apparatus and radio communication method |
US7218684B2 (en) | 2001-11-02 | 2007-05-15 | Interdigital Technology Corporation | Method and system for code reuse and capacity enhancement using null steering |
US20030125040A1 (en) | 2001-11-06 | 2003-07-03 | Walton Jay R. | Multiple-access multiple-input multiple-output (MIMO) communication system |
US8018903B2 (en) | 2001-11-21 | 2011-09-13 | Texas Instruments Incorporated | Closed-loop transmit diversity scheme in frequency selective multipath channels |
JP3989439B2 (ja) | 2001-11-28 | 2007-10-10 | 富士通株式会社 | 直交周波数分割多重伝送方法 |
US7346126B2 (en) | 2001-11-28 | 2008-03-18 | Telefonaktiebolaget L M Ericsson (Publ) | Method and apparatus for channel estimation using plural channels |
US7263119B1 (en) | 2001-11-29 | 2007-08-28 | Marvell International Ltd. | Decoding method and apparatus |
US6760388B2 (en) | 2001-12-07 | 2004-07-06 | Qualcomm Incorporated | Time-domain transmit and receive processing with channel eigen-mode decomposition for MIMO systems |
US7155171B2 (en) | 2001-12-12 | 2006-12-26 | Saraband Wireless | Vector network analyzer applique for adaptive communications in wireless networks |
US20030112745A1 (en) | 2001-12-17 | 2003-06-19 | Xiangyang Zhuang | Method and system of operating a coded OFDM communication system |
US20030202612A1 (en) | 2001-12-18 | 2003-10-30 | Bijit Halder | Method and system for rate enhanced SHDSL |
US7099398B1 (en) | 2001-12-18 | 2006-08-29 | Vixs, Inc. | Method and apparatus for establishing non-standard data rates in a wireless communication system |
US7573805B2 (en) * | 2001-12-28 | 2009-08-11 | Motorola, Inc. | Data transmission and reception method and apparatus |
JP4052835B2 (ja) | 2001-12-28 | 2008-02-27 | 株式会社日立製作所 | 多地点中継を行う無線伝送システム及びそれに使用する無線装置 |
CA2366397A1 (en) | 2001-12-31 | 2003-06-30 | Tropic Networks Inc. | An interface for data transfer between integrated circuits |
US7209433B2 (en) | 2002-01-07 | 2007-04-24 | Hitachi, Ltd. | Channel estimation and compensation techniques for use in frequency division multiplexed systems |
US7020110B2 (en) * | 2002-01-08 | 2006-03-28 | Qualcomm Incorporated | Resource allocation for MIMO-OFDM communication systems |
US7020482B2 (en) * | 2002-01-23 | 2006-03-28 | Qualcomm Incorporated | Reallocation of excess power for full channel-state information (CSI) multiple-input, multiple-output (MIMO) systems |
GB2386513B (en) | 2002-02-07 | 2004-08-25 | Samsung Electronics Co Ltd | Apparatus and method for transmitting/receiving serving hs-scch set information in an hsdpa communication system |
US7046978B2 (en) | 2002-02-08 | 2006-05-16 | Qualcomm, Inc. | Method and apparatus for transmit pre-correction in wireless communications |
US6980800B2 (en) | 2002-02-12 | 2005-12-27 | Hughes Network Systems | System and method for providing contention channel organization for broadband satellite access in a communications network |
US7292854B2 (en) | 2002-02-15 | 2007-11-06 | Lucent Technologies Inc. | Express signaling in a wireless communication system |
US7076263B2 (en) | 2002-02-19 | 2006-07-11 | Qualcomm, Incorporated | Power control for partial channel-state information (CSI) multiple-input, multiple-output (MIMO) systems |
US20030162519A1 (en) * | 2002-02-26 | 2003-08-28 | Martin Smith | Radio communications device |
US6862271B2 (en) | 2002-02-26 | 2005-03-01 | Qualcomm Incorporated | Multiple-input, multiple-output (MIMO) systems with multiple transmission modes |
US6959171B2 (en) | 2002-02-28 | 2005-10-25 | Intel Corporation | Data transmission rate control |
US6873651B2 (en) | 2002-03-01 | 2005-03-29 | Cognio, Inc. | System and method for joint maximal ratio combining using time-domain signal processing |
US6636568B2 (en) | 2002-03-01 | 2003-10-21 | Qualcomm | Data transmission with non-uniform distribution of data rates for a multiple-input multiple-output (MIMO) system |
US6687492B1 (en) * | 2002-03-01 | 2004-02-03 | Cognio, Inc. | System and method for antenna diversity using joint maximal ratio combining |
JP3561510B2 (ja) | 2002-03-22 | 2004-09-02 | 松下電器産業株式会社 | 基地局装置及びパケット伝送方法 |
US7012978B2 (en) * | 2002-03-26 | 2006-03-14 | Intel Corporation | Robust multiple chain receiver |
US20040198276A1 (en) | 2002-03-26 | 2004-10-07 | Jose Tellado | Multiple channel wireless receiver |
US7197084B2 (en) | 2002-03-27 | 2007-03-27 | Qualcomm Incorporated | Precoding for a multipath channel in a MIMO system |
KR100456693B1 (ko) | 2002-03-28 | 2004-11-10 | 삼성전자주식회사 | 다중채널 통신 시스템의 비트 할당을 최적화하여 셋업시간을 최소화하는 방법 |
US7224704B2 (en) | 2002-04-01 | 2007-05-29 | Texas Instruments Incorporated | Wireless network scheduling data frames including physical layer configuration |
US7099377B2 (en) | 2002-04-03 | 2006-08-29 | Stmicroelectronics N.V. | Method and device for interference cancellation in a CDMA wireless communication system |
WO2003088540A1 (en) | 2002-04-05 | 2003-10-23 | Flarion Technologies, Inc. | Phase sequences for timing and access signals |
US7103325B1 (en) | 2002-04-05 | 2006-09-05 | Nortel Networks Limited | Adaptive modulation and coding |
US7876726B2 (en) | 2002-04-29 | 2011-01-25 | Texas Instruments Incorporated | Adaptive allocation of communications link channels to I- or Q-subchannel |
US6690660B2 (en) * | 2002-05-22 | 2004-02-10 | Interdigital Technology Corporation | Adaptive algorithm for a Cholesky approximation |
US7327800B2 (en) | 2002-05-24 | 2008-02-05 | Vecima Networks Inc. | System and method for data detection in wireless communication systems |
US6862440B2 (en) | 2002-05-29 | 2005-03-01 | Intel Corporation | Method and system for multiple channel wireless transmitter and receiver phase and amplitude calibration |
US7421039B2 (en) | 2002-06-04 | 2008-09-02 | Lucent Technologies Inc. | Method and system employing antenna arrays |
KR100498326B1 (ko) * | 2002-06-18 | 2005-07-01 | 엘지전자 주식회사 | 이동통신 단말기의 적응 변조 코딩 장치 및 방법 |
US7184713B2 (en) * | 2002-06-20 | 2007-02-27 | Qualcomm, Incorporated | Rate control for multi-channel communication systems |
US7613248B2 (en) | 2002-06-24 | 2009-11-03 | Qualcomm Incorporated | Signal processing with channel eigenmode decomposition and channel inversion for MIMO systems |
US7095709B2 (en) | 2002-06-24 | 2006-08-22 | Qualcomm, Incorporated | Diversity transmission modes for MIMO OFDM communication systems |
US7359313B2 (en) * | 2002-06-24 | 2008-04-15 | Agere Systems Inc. | Space-time bit-interleaved coded modulation for wideband transmission |
ATE352913T1 (de) | 2002-06-27 | 2007-02-15 | Koninkl Philips Electronics Nv | Messung von kanaleigenschaften in einem kommunikationssystem |
US7551546B2 (en) | 2002-06-27 | 2009-06-23 | Nortel Networks Limited | Dual-mode shared OFDM methods/transmitters, receivers and systems |
US7342912B1 (en) | 2002-06-28 | 2008-03-11 | Arraycomm, Llc. | Selection of user-specific transmission parameters for optimization of transmit performance in wireless communications using a common pilot channel |
EP1379020A1 (en) | 2002-07-03 | 2004-01-07 | National University Of Singapore | A wireless communication apparatus and method |
US20040071199A1 (en) | 2002-07-03 | 2004-04-15 | Commasic, Inc. | Virtual finger method and apparatus for processing digital communication signals |
US6683916B1 (en) * | 2002-07-17 | 2004-01-27 | Philippe Jean-Marc Sartori | Adaptive modulation/coding and power allocation system |
US6885708B2 (en) * | 2002-07-18 | 2005-04-26 | Motorola, Inc. | Training prefix modulation method and receiver |
KR20040011653A (ko) | 2002-07-29 | 2004-02-11 | 삼성전자주식회사 | 채널 특성에 적응적인 직교 주파수 분할 다중 통신 방법및 장치 |
CN1698274B (zh) * | 2002-07-30 | 2012-07-18 | 美商智慧财产权授权股份有限公司 | 多输入多输出无线通信的装置及方法 |
US7653415B2 (en) * | 2002-08-21 | 2010-01-26 | Broadcom Corporation | Method and system for increasing data rate in a mobile terminal using spatial multiplexing for DVB-H communication |
ATE421809T1 (de) | 2002-08-22 | 2009-02-15 | Imec Inter Uni Micro Electr | Verfahren zur mimo-übertragung für mehrere benutzer und entsprechende vorrichtungen |
US20040037257A1 (en) | 2002-08-23 | 2004-02-26 | Koninklijke Philips Electronics N.V. | Method and apparatus for assuring quality of service in wireless local area networks |
US6940917B2 (en) | 2002-08-27 | 2005-09-06 | Qualcomm, Incorporated | Beam-steering and beam-forming for wideband MIMO/MISO systems |
AU2002330691A1 (en) * | 2002-09-06 | 2004-03-29 | Nokia Corporation | Antenna selection method |
US7260153B2 (en) | 2002-09-09 | 2007-08-21 | Mimopro Ltd. | Multi input multi output wireless communication method and apparatus providing extended range and extended rate across imperfectly estimated channels |
US20040052228A1 (en) | 2002-09-16 | 2004-03-18 | Jose Tellado | Method and system of frequency and time synchronization of a transceiver to signals received by the transceiver |
US6850511B2 (en) * | 2002-10-15 | 2005-02-01 | Intech 21, Inc. | Timely organized ad hoc network and protocol for timely organized ad hoc network |
US7961774B2 (en) * | 2002-10-15 | 2011-06-14 | Texas Instruments Incorporated | Multipath interference-resistant receivers for closed-loop transmit diversity (CLTD) in code-division multiple access (CDMA) systems |
US7453844B1 (en) | 2002-10-22 | 2008-11-18 | Hong Kong Applied Science and Technology Research Institute, Co., Ltd. | Dynamic allocation of channels in a wireless network |
US7200404B2 (en) | 2002-10-22 | 2007-04-03 | Texas Instruments Incorporated | Information storage to support wireless communication in non-exclusive spectrum |
US8570988B2 (en) | 2002-10-25 | 2013-10-29 | Qualcomm Incorporated | Channel calibration for a time division duplexed communication system |
US8208364B2 (en) | 2002-10-25 | 2012-06-26 | Qualcomm Incorporated | MIMO system with multiple spatial multiplexing modes |
US8169944B2 (en) | 2002-10-25 | 2012-05-01 | Qualcomm Incorporated | Random access for wireless multiple-access communication systems |
US7324429B2 (en) * | 2002-10-25 | 2008-01-29 | Qualcomm, Incorporated | Multi-mode terminal in a wireless MIMO system |
US8218609B2 (en) | 2002-10-25 | 2012-07-10 | Qualcomm Incorporated | Closed-loop rate control for a multi-channel communication system |
US7151809B2 (en) * | 2002-10-25 | 2006-12-19 | Qualcomm, Incorporated | Channel estimation and spatial processing for TDD MIMO systems |
JP4981253B2 (ja) | 2002-10-25 | 2012-07-18 | クゥアルコム・インコーポレイテッド | 無線通信システムのためのデータ検出および復調 |
US7986742B2 (en) | 2002-10-25 | 2011-07-26 | Qualcomm Incorporated | Pilots for MIMO communication system |
US8134976B2 (en) * | 2002-10-25 | 2012-03-13 | Qualcomm Incorporated | Channel calibration for a time division duplexed communication system |
US8320301B2 (en) | 2002-10-25 | 2012-11-27 | Qualcomm Incorporated | MIMO WLAN system |
JP2006504324A (ja) * | 2002-10-26 | 2006-02-02 | エレクトロニクス アンド テレコミュニケーションズ リサーチ インスチチュート | combパターンシンボルの周波数跳躍直交周波数分割多重接続方法 |
EP1416688A1 (en) | 2002-10-31 | 2004-05-06 | Motorola Inc. | Iterative channel estimation in multicarrier receivers |
US7317750B2 (en) | 2002-10-31 | 2008-01-08 | Lot 41 Acquisition Foundation, Llc | Orthogonal superposition coding for direct-sequence communications |
US7280625B2 (en) | 2002-12-11 | 2007-10-09 | Qualcomm Incorporated | Derivation of eigenvectors for spatial processing in MIMO communication systems |
US7058367B1 (en) | 2003-01-31 | 2006-06-06 | At&T Corp. | Rate-adaptive methods for communicating over multiple input/multiple output wireless systems |
US7583637B2 (en) | 2003-01-31 | 2009-09-01 | Alcatel-Lucent Usa Inc. | Methods of controlling data rate in wireless communications systems |
US20040176097A1 (en) | 2003-02-06 | 2004-09-09 | Fiona Wilson | Allocation of sub channels of MIMO channels of a wireless network |
EP1447934A1 (en) | 2003-02-12 | 2004-08-18 | Institut Eurecom G.I.E. | Transmission and reception diversity process for wireless communications |
JP2004266586A (ja) * | 2003-03-03 | 2004-09-24 | Hitachi Ltd | 移動通信システムのデータ送受信方法 |
JP4250002B2 (ja) | 2003-03-05 | 2009-04-08 | 富士通株式会社 | 適応型変調伝送システム及び適応型変調制御方法 |
US6927728B2 (en) | 2003-03-13 | 2005-08-09 | Motorola, Inc. | Method and apparatus for multi-antenna transmission |
US7885228B2 (en) | 2003-03-20 | 2011-02-08 | Qualcomm Incorporated | Transmission mode selection for data transmission in a multi-channel communication system |
JP4259897B2 (ja) | 2003-03-25 | 2009-04-30 | シャープ株式会社 | 無線データ伝送システム及び無線データ送受信装置 |
US7242727B2 (en) | 2003-03-31 | 2007-07-10 | Lucent Technologies Inc. | Method of determining transmit power for transmit eigenbeams in a multiple-input multiple-output communications system |
CA2532080A1 (en) | 2003-07-11 | 2005-01-27 | Qualcomm Incorporated | Dynamic shared forward link channel for a wireless communication system |
CN100429311C (zh) | 2003-08-08 | 2008-10-29 | 四川禾本生物工程有限公司 | 高抗草苷膦的epsp合成酶及其编码序列 |
DE602004029906D1 (de) * | 2003-08-27 | 2010-12-16 | Wavion Ltd | Wlan-kapazitäts-erweiterung durch verwendung von sdm |
US7065144B2 (en) * | 2003-08-27 | 2006-06-20 | Qualcomm Incorporated | Frequency-independent spatial processing for wideband MISO and MIMO systems |
US7356089B2 (en) * | 2003-09-05 | 2008-04-08 | Nortel Networks Limited | Phase offset spatial multiplexing |
KR100995031B1 (ko) | 2003-10-01 | 2010-11-19 | 엘지전자 주식회사 | 다중입력 다중출력 시스템에 적용되는 신호 전송 제어 방법 |
US8483105B2 (en) | 2003-10-15 | 2013-07-09 | Qualcomm Incorporated | High speed media access control |
US8842657B2 (en) | 2003-10-15 | 2014-09-23 | Qualcomm Incorporated | High speed media access control with legacy system interoperability |
US8233462B2 (en) | 2003-10-15 | 2012-07-31 | Qualcomm Incorporated | High speed media access control and direct link protocol |
US7508748B2 (en) | 2003-10-24 | 2009-03-24 | Qualcomm Incorporated | Rate selection for a multi-carrier MIMO system |
WO2005041515A1 (en) | 2003-10-24 | 2005-05-06 | Qualcomm Incorporated | Frequency division multiplexing of multiple data streams in a wireless multi-carrier communication system |
US7616698B2 (en) | 2003-11-04 | 2009-11-10 | Atheros Communications, Inc. | Multiple-input multiple output system and method |
US7298805B2 (en) * | 2003-11-21 | 2007-11-20 | Qualcomm Incorporated | Multi-antenna transmission for spatial division multiple access |
US9473269B2 (en) | 2003-12-01 | 2016-10-18 | Qualcomm Incorporated | Method and apparatus for providing an efficient control channel structure in a wireless communication system |
US7231184B2 (en) | 2003-12-05 | 2007-06-12 | Texas Instruments Incorporated | Low overhead transmit channel estimation |
EP1698086A2 (en) | 2003-12-27 | 2006-09-06 | Electronics and Telecommunications Research Institute | A mimo-ofdm system using eigenbeamforming method |
US7746886B2 (en) | 2004-02-19 | 2010-06-29 | Broadcom Corporation | Asymmetrical MIMO wireless communications |
US7206354B2 (en) | 2004-02-19 | 2007-04-17 | Qualcomm Incorporated | Calibration of downlink and uplink channel responses in a wireless MIMO communication system |
US7274734B2 (en) | 2004-02-20 | 2007-09-25 | Aktino, Inc. | Iterative waterfiling with explicit bandwidth constraints |
US7848442B2 (en) | 2004-04-02 | 2010-12-07 | Lg Electronics Inc. | Signal processing apparatus and method in multi-input/multi-output communications systems |
US7486740B2 (en) | 2004-04-02 | 2009-02-03 | Qualcomm Incorporated | Calibration of transmit and receive chains in a MIMO communication system |
US7110463B2 (en) | 2004-06-30 | 2006-09-19 | Qualcomm, Incorporated | Efficient computation of spatial filter matrices for steering transmit diversity in a MIMO communication system |
US7599443B2 (en) | 2004-09-13 | 2009-10-06 | Nokia Corporation | Method and apparatus to balance maximum information rate with quality of service in a MIMO system |
KR100905605B1 (ko) * | 2004-09-24 | 2009-07-02 | 삼성전자주식회사 | 직교주파수분할다중화 다중입출력 통신 시스템의 전송 방법 |
TWI296753B (en) | 2004-10-26 | 2008-05-11 | Via Tech Inc | Usb control circuit for saving power and the method thereof |
US7525988B2 (en) | 2005-01-17 | 2009-04-28 | Broadcom Corporation | Method and system for rate selection algorithm to maximize throughput in closed loop multiple input multiple output (MIMO) wireless local area network (WLAN) system |
US7603141B2 (en) | 2005-06-02 | 2009-10-13 | Qualcomm, Inc. | Multi-antenna station with distributed antennas |
US8619620B2 (en) * | 2008-09-16 | 2013-12-31 | Qualcomm Incorporated | Methods and systems for transmission mode selection in a multi channel communication system |
US20100260060A1 (en) | 2009-04-08 | 2010-10-14 | Qualcomm Incorporated | Integrated calibration protocol for wireless lans |
-
2002
- 2002-08-27 US US10/229,209 patent/US8194770B2/en active Active
-
2003
- 2003-08-19 CA CA002496619A patent/CA2496619A1/en not_active Abandoned
- 2003-08-19 MX MXPA05002229A patent/MXPA05002229A/es active IP Right Grant
- 2003-08-19 BR BRPI0313819-4A patent/BR0313819A/pt not_active IP Right Cessation
- 2003-08-19 EP EP03791732A patent/EP1532762B1/en not_active Expired - Fee Related
- 2003-08-19 AU AU2003265601A patent/AU2003265601B2/en not_active Ceased
- 2003-08-19 CN CNB038206331A patent/CN100370721C/zh not_active Expired - Fee Related
- 2003-08-19 RU RU2005108590/09A patent/RU2328074C2/ru not_active IP Right Cessation
- 2003-08-19 UA UAA200502702A patent/UA84684C2/ru unknown
- 2003-08-19 KR KR1020057002684A patent/KR100983231B1/ko not_active IP Right Cessation
- 2003-08-19 JP JP2004532954A patent/JP4386836B2/ja not_active Expired - Lifetime
- 2003-08-19 WO PCT/US2003/026395 patent/WO2004021634A1/en active IP Right Grant
- 2003-08-19 DE DE60310237T patent/DE60310237T2/de not_active Expired - Lifetime
- 2003-08-27 TW TW092123617A patent/TWI324862B/zh not_active IP Right Cessation
-
2005
- 2005-01-30 IL IL16657905A patent/IL166579A0/xx unknown
-
2006
- 2006-03-14 HK HK06103245.1A patent/HK1083283A1/xx not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
RU2005108590A (ru) | 2005-08-27 |
CN1679269A (zh) | 2005-10-05 |
CN100370721C (zh) | 2008-02-20 |
UA84684C2 (ru) | 2008-11-25 |
AU2003265601B2 (en) | 2008-12-18 |
JP4386836B2 (ja) | 2009-12-16 |
BR0313819A (pt) | 2007-09-11 |
WO2004021634A1 (en) | 2004-03-11 |
EP1532762B1 (en) | 2006-12-06 |
CA2496619A1 (en) | 2004-03-11 |
KR20050058333A (ko) | 2005-06-16 |
TW200414708A (en) | 2004-08-01 |
EP1532762A1 (en) | 2005-05-25 |
KR100983231B1 (ko) | 2010-09-20 |
JP2005537750A (ja) | 2005-12-08 |
MXPA05002229A (es) | 2005-07-05 |
DE60310237T2 (de) | 2007-06-28 |
HK1083283A1 (en) | 2006-06-30 |
US8194770B2 (en) | 2012-06-05 |
US20040042556A1 (en) | 2004-03-04 |
RU2328074C2 (ru) | 2008-06-27 |
AU2003265601A1 (en) | 2004-03-19 |
DE60310237D1 (de) | 2007-01-18 |
IL166579A0 (en) | 2006-01-15 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
TWI324862B (en) | Coded mimo systems with selective channel inversion applied per eigenmode | |
AU2003262813B2 (en) | Beam-steering and beam-forming for wideband mimo/miso systems | |
JP4843033B2 (ja) | 通信システムにおける複数のデータストリームの符号化および変調 | |
RU2317648C2 (ru) | Обработка сигналов с разложением на собственные моды канала и инверсией канала для мвмв-систем | |
KR100853641B1 (ko) | Mimo 통신 시스템에서 공간 확산을 통한 데이터 전송방법 및 장치 | |
JP5479411B2 (ja) | 仮想アンテナを選択する方法および装置 | |
US7336746B2 (en) | Data transmission with spatial spreading in a MIMO communication system | |
KR101129114B1 (ko) | 광대역 miso 및 mimo 시스템에 대한 주파수 독립 공간 프로세싱 | |
KR100957738B1 (ko) | 다중 송신 모드를 갖는 다중-입력 다중-출력(mimo)시스템 | |
WO2006019711A1 (en) | Multi-mode mimo transmission and reception | |
Hu et al. | Space-time-frequency domain water-filling in MIMO-OFDM fading system | |
Boccolini et al. | Variable-rate equal-power waterfilling for non-binary LDPC coded multicarrier systems |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
MM4A | Annulment or lapse of patent due to non-payment of fees |