CN1435015A - 使用多个天线和自适应控制最大化通信参数的方法和无线系统 - Google Patents

使用多个天线和自适应控制最大化通信参数的方法和无线系统 Download PDF

Info

Publication number
CN1435015A
CN1435015A CN00818937.4A CN00818937A CN1435015A CN 1435015 A CN1435015 A CN 1435015A CN 00818937 A CN00818937 A CN 00818937A CN 1435015 A CN1435015 A CN 1435015A
Authority
CN
China
Prior art keywords
communication system
characterisitic parameter
parameter
channel
signal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN00818937.4A
Other languages
English (en)
Other versions
CN1207852C (zh
Inventor
A·J·保尔拉
D·J·杰斯伯特
P·K·赛巴斯蒂安
J·泰拉多
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Iospan Wireless Inc
Original Assignee
Iospan Wireless Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Iospan Wireless Inc filed Critical Iospan Wireless Inc
Publication of CN1435015A publication Critical patent/CN1435015A/zh
Application granted granted Critical
Publication of CN1207852C publication Critical patent/CN1207852C/zh
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Images

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0891Space-time diversity
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00Details of, or arrangements associated with, antennas
    • H01Q1/12Supports; Mounting means
    • H01Q1/22Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/24Supports; Mounting means by structural association with other equipment or articles with receiving set
    • H01Q1/241Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
    • H01Q1/246Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for base stations
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q3/00Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
    • H01Q3/26Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture
    • H01Q3/2605Array of radiating elements provided with a feedback control over the element weights, e.g. adaptive arrays
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0667Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of delayed versions of same signal
    • H04B7/0669Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of delayed versions of same signal using different channel coding between antennas
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0697Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using spatial multiplexing
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0837Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
    • H04B7/0842Weighted combining
    • H04B7/0848Joint weighting
    • H04B7/0857Joint weighting using maximum ratio combining techniques, e.g. signal-to- interference ratio [SIR], received signal strenght indication [RSS]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/0001Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0002Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
    • H04L1/0003Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/0001Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0009Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/02Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/02Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
    • H04L1/0618Space-time coding
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0667Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of delayed versions of same signal
    • H04B7/0673Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of delayed versions of same signal using feedback from receiving side
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/0001Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0026Transmission of channel quality indication
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/02Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
    • H04L1/0606Space-frequency coding

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)

Abstract

一种最大化通信参数的方法,通信参数比如在有M个发送天线(18A...18M)的发送单元(12)和有N个接收天线(34A...34N)的接收单元之间(14)的信道的数据容量、信号特性或吞吐量以及使用这个方法的通信系统。首先处理数据以产生并行空间多路复用流SMi,其中i=1...k,它被转换为或被映射为发送信号TSp,其中p=1...M,分配它们以从M个发送天线(18A...18M)的发送。通过接收器的N个接收天线(34A...34N)以接收相应的接收信号RSj,其中j=1...N,并被用于估算特性参数,比如统计信号参数或数据的参数。特性参数被用于自适应调节k以及其他到发送天线的参数以最大化信道的通信参数。

Description

使用多个天线和自适应控制最大化通信参数的方法和无线系统
发明领域
此项发明一般与使用带有多个天线的发送和接收单元使发送适应信道状态并最大化通信参数的无线通信系统和方法有关。
发明背景
服务固定和移动无线用户的无线通信系统正快速得到普及。开发了许多系统布局和通信协议以在这样的无线通信系统中提供覆盖范围。
在发送和接收设备间的无线通信信道本质上是可变的,并从而有了它们性能的波动。因此,它们的性能参数也是时刻变化的。在优良的条件下,无线信道呈现优良的通信参数,例如高信噪比、大数据容量和/或吞吐量。在这些时候大量数据可通过信道可靠地发送。然而,由于信道时刻改变,所以通信参数也会改变。在改变的条件下,先前的数据率、编码技术和数据格式会不再可行。例如,当信道性能下降了,发送的数据会经受过多的讹误而产生无法接受的通信参数。比如,发送数据会显示过多的误码率或数据包错误率。信道的恶化是由于多种因素引起的,比如在信道中的总噪声、多路径衰落、视线路径损失、过多的同信道干扰(CCI)和其他因素。
通过减少CCI,可以改进载波—干扰(C/I)比并使频谱效率增加。特别地,改进的C/I比产生更高的每链路比特率、允许更主动的频率复用结构以及增加系统的覆盖范围。
在通信技术中也已知装备有天线阵列而不是单个天线的发送单元和接收单元能改进接收器性能。天线阵列既能减少期望信号的多路径衰落又能抑制干扰信号或CCI。这样的阵列能因此增加无线系统的范围和容量。这对于无线蜂窝电话和其他移动系统是正确的,对于固定无线接入(FWA)系统也是正确的。
在移动系统中,多种因素导致信号恶化和讹误。这些包括来自在特定单元内或在其附近的其他蜂窝用户的干扰。信号恶化的另一个来源是多路径衰落,其中信号接收幅度和相位在时间上是改变的。对于以每小时60英里行进的移动用户在大约1.9GHz的PCS频率衰落速率可以达到200Hz之多。在这样的环境中,问题是从接收的噪声、CCI和在阵列的天线上相加的期望信号部分的集合中清楚地提取所跟踪的用户信号。
在FWA系统中,比如接收器保持固定的地方,信号衰落速率比在移动系统中小。在这种情况下,信道相干时间或信号估算保持稳定的时间更长了,这是由于接收器是不动的。尽管如此,在FWA系统中经过一定时间上也会失去信道相干性。
天线阵列系统设计者增加总接收信号功率,这使得期望信号的提取更容易。例如在1997年11月IEEE信号处理杂志第49-83页Theodore S.Rappaport的《智能天线、自适应阵列、算法和无线定位》的手册和Paulraj、A.J以及其他人的《无线通信的空间-时间处理》中详细描述使用自适应天线阵列的信号恢复技术。
原有技术的无线系统使用了利用从接收器的反馈的发送信号的自适应调制,也使用了自适应编码和接收器反馈使数据发送适应变化的信道条件。然而,只用自适应调制和/或编码使具有多个发送和接收天线的信道容量有效最大化是不可能的。
在美国专利号Barratt以及其他人的5592490、Ottersten以及其他人的5828658和Roy III的5642353中讲述了关于在发送器处使用多个天线的频谱有效的高容量无线通信系统;这里就是用于空分多址(SDMA)的收发信机基站(BTS)。在这些系统中,用户或接收单元不得不在空间上被足够的分离并且BTS使用它的发送天线形成直接针对每个接收单元的波束。为了正确地形成波束发送器在发送之前需要了解信道状态信息比如“空间标识”。在这种情况下空间多路技术就意味着数据流被同时发送到空间上足够分离的的多个用户。
由Barratt以及其他人、Ottersten以及其他人和Roy III讲述的波束形成方法的缺点就是用户不得不在空间上有效地分离并且要已知它们的空间标识。信道信息也得提前可供发送单元使用且不能有效地考虑变化的信道条件。最后,形成的波束只发送一个数据流到每个用户,这样不能好好利用这段时间,这时特定的信道能显出很好的通信参数并有更高的数据容量以发送更多的数据或有更好的信噪比使得数据能以较不稳健的格式传输。
Paneth以及其他人的美国专利号5687194描述了使用多个天线作为分集的时分多址(TDMA)通信系统。所提出的这个系统使用了自适应发送功率和调制的概念。根据反馈到发送器的信号特性指示符选择功率和调制的电平。
与Paneth以及其他人设计同样问题,Avidor以及其他人的美国专利号5914946讲述了用自适应天线波束的系统。随着信道变化动态地调节波束。特别地,为了最大化信号特性并减少系统干扰按照接收信号指示符的函数调节波束。
最后两个专利确实有助于自适应改变多个天线系统以优化变化信道条件中的性能。然而,更进一步的改进是可取的。特别地,期望开发一个系统,其中发送单元和接收单元都很好地利用多个天线,来不仅自适应地改变调制和/或编码而且都在同时使用适合的分集方案,空间多路复用阶数。这些自适应的变化将会帮助在信道变化时保持信道通信参数最大化。此外,在这项技术中成为一项发展的是开发了一个通信系统,它在发送和接收单元利用多个天线以适应变化的信道条件并最大化一些期望的通信参数中的任何一个,比如数据容量、信噪比和吞吐量。这将会允许系统不断适应于通过信道发送的数据种类。
发明目的和优点
因此,此项发明的主要目的就是提供一种方法最大化在都使用多个天线的无线发送和接收单元之间信道中的通信参数。特别地,该方法应该允许在信道改变时不断地优化数据容量、信噪比、信号特性、吞吐量和其他的期望参数。
本发明的进一步目的是提供一种方法,它充分利用在发送和接收单元处的多个天线使用从接收信号导出的特性参数优化信道的通信参数。
本发明还有一个目的就是在使用多址技术比如TDMA、FDMA、CDMA、OFDMA的任意组合的任何无线通信系统中提供以上所示的方法。
本发明也有一个目的就是提供利用自适应编码、空间多路技术和天线分集以在变化信道条件下不断最大化期望通信参数的无线通信系统。
以下会指出以上目的和优点以及发明的方法和设备实现的许多其他改进。
发明概述
通过最大化在有M个发送天线的发送单元和有N个接收天线的接收单元之间的信道的通信参数如数据容量、信号特性或吞吐量的方法达到发明的目的和优点。首先处理数据以产生并行的空间多路复用流SMi,其中i=1...k。然后空间多路复用流SMi被转换为或被映射为发送信号TSp,其中p=1...M,分配它们以从M个发送天线发送。
发送信号通过信道发送并通过接收器的N个接收天线以接收信号RSj的形式接收,其中j=1...N。接收信号RSj被用于估算特性参数。特性参数被用于自适应调节k以最大化信道的通信参数。
在较佳实施例中,每个空间多路复用流SMi通过编码处理产生码流CSh,其中h=1...k’。在发送器中使用特性参数调节编码,例如通过改变由编码单元使用的k’。编码单元可以是空间-时间编码器、空间-频率编码器和自适应调制速率编码器或其他适合的编码装置。空间-时间和空间-频率编码器可以使用不同的编码和调制速率。
在接收器处接收处理接收信号RSj重新产生空间多路复用流SMi。从接收处理流SMi可以得到特性参数。这可以通过检查流SMi的统计单元完成。在这种情况下,特性参数可以是信号-干扰比、信噪比、功率电平、电平交叉速率、在预定阈值和接收阈值的信号电平交叉持续时间。此外可选择地,特性参数可以通过重构数据得到。在这种情况下特性参数可以是误码率(BER)或数据包错误率。
在发送器的映射步骤较佳地还包括有发送处理块实现的发送处理步骤。然后特性参数较佳地被用于调节发送处理块的处理。
虽然通常在接收器估算特性参数并以任何适合的方法反馈或发送到发送器,例如在象用于时分双工(TDD)系统中的互易信道上,但是要通过发送器进行接收信号的分析以得到特性参数。这是有利的,例如当接收器没有足够的计算资源来导出特性参数。
可以通过使用任何适合的编码技术在发送器进行处理数据的步骤。例如,可以使用空间-时间编码或空间-频率编码。同时,根据至少一项多址技术比如TDMA、FDMA、CDMA、OFDMA格式化发送信号TSp
在包括便携式和固定设备的任何发送和接收单元之间使用发明的方法。在一个实施例中,在无线网络中比如蜂窝通信系统使用这个方法。在这种情况下可以使用这个方法改善在向下链路和向上链路通信中的通信参数。
在已有的有多个接收和发送天线的系统中可使用本发明的方法。这个方法也允许同时使用其它方法。特别地,与干扰对消技术一起使用发明的技术是有利的。
使用本发明方法的通信系统达到了在其发送和接收单元之间的通信参数的自适应最大化。发送单元具有处理数据以产生并行空间多路复用流SMi的处理设备和把流SMi转换成发送信号TSp并把它们映射到M个发送天线的天线映射设备。通信系统装备有估算接收信号RSj特性参数的单元。此外,通信系统有根据特性参数自适应调节k以最大化通信参数的设备。这个设备可被置于发送单元里。
估算特性参数的单元是统计单元并且较佳地被置于接收单元。当然,统计单元可以置于发送单元,因为当接收单元没有足够的资源或功率支持统计单元时这样是有利的。
通信系统还具有处理流SMi以产生编码流CSh(h=1...k’)的编码单元。然后用于调节k的设备也具有调节k’的机制。编码单元可以是空间-时间编码器、空间-频率编码器或自适应调制和编码率的编码器。较佳地,编码和发送处理参数的数据库被连接于编码单元和天线映射设备。
自适应控制器被连接到处理设备、编码单元和天线映射设备。自适应控制器根据特性参数调节这些设备。可选择地,自适应控制器就被连接到处理设备和天线映射设备并根据特性参数调节它们。
通信系统可以使用任何一个或更多可用的多址技术比如TDMA、FDMA、CDMA、OFDMA。这可以在无线系统中例如蜂窝通信系统完成。
以下参考所附图提出发明和较佳及可选实施例的详细描述。
附图简述
图1是说明应用本发明之方法的通信系统的简图。
图2是说明根据本发明的发送和接收单元的方框简图。
图3是依照本发明的示例发送单元的框图。
图4是依照本发明的示例接收单元的框图。
图5A是说明导出特性参数的统计单元操作的框图。
图5B是说明的从重构数据导出特性参数的另一种数据分析块操作的框图。
图6是依照本发明的发送单元的另一个实施例的部分框图。
图7是从图6发送单元接收接收信号的接收单元的部分框图。
图8说明依照本发明的S-T码选择的性能曲线图。
详细描述
在首先考虑图1和图2的高层次图以后就会更好地理解发明的方法和无线系统。图1说明了无线通信系统10例如蜂窝无线系统的一部分。为了解释的目的,将考虑下行通信,其中发送单元12是基站(BTS)而接收单元14是移动或固定无线用户设备。示例用户设备包括移动接收单元14A、14B、14C,它们是移动电话和汽车电话,以及固定接收单元14D,它可以是用在住所或任何其他固定无线单元的无线调制解调器单元。当然,在从无线单元14到BTS12的上行通信可以使用同样的方法。
BTS12有包括多个发送天线18A、18B、...、18M的天线阵列16。接收单元14装备有N个接收天线的天线阵列20(详细情况参见图2、4)。BTS12通过信道22A和22B把发送信号TS发送到所有接收单元14。为了简便,只指出BTS12和接收单元14A、14B之间的信道20A、20B,虽然BTS12把TS信号发送到所有显示的单元。在这个特别情况下,接收单元14A、14B都被置于一个单元24内。然而,就本技术中已知的,在合适的信道条件下BTS12可以把TS信号发送到单元24以外的单元。
信道22A、22B的时间变化使得发送的TS信号经历衰减、干扰、多路径衰落和其他有害影响的波动电平。因此,信道22A、22B的特性参数比如数据容量、信号特性或吞吐量遭受暂时的变化。这样,信道22A、22B不能一直支持高数据率信号RS或没有用稳健的编码算法格式化过的信号的有效传播。在BTS12的天线阵列16可用于空间多路复用技术、发送分集、波束形成以减少干扰、增加阵列增益并达到其他有利的效果。在接收单元14的天线阵列20被用于空间多路复用、干扰对除、接收分集、增加的阵列增益和其他有利作用。所有这些方法改进信道22A、22B的容量。本发明的方法发现了随着信道22A、22B的变化条件自适应选择的这些技术的最佳组合。换句话说,本发明的方法实现了发送天线阵列16到天线阵列20上的空间多路复用的阶数、分集的阶数以及编码和比特加载率的自适应最佳选择。
特别地,发明的方法通过根据特性参数自适应最大化一个或更多通信参数解决了这些变化的信道条件。图2说明使用这个方法必需的发送单元12和一个接收单元145的基本块。发送单元12有连接到数据处理块28的用于接收要格式化、编码并被映射到天线18A、18B、...、18M以从那里发送的数据的控制单元26。上变频和RF放大块30把发送信号TS送到天线18A、18B、...、18M。
在连路的另一边,接收单元14在它的阵列20中有N个天线34A、34B、...、34N以接收信号RS。RF放大和向下变频块36处理RS信号并把它们发送到数据处理块38。信号统计单元40估算RS信号的特性参数和/或恢复数据并把特性参数反馈到发送器12的控制单元26。以虚线42表示反馈。使用这个特性参数,单元26控制数据处理28以确保适当的空间多路复用、分集处理、编码和数据30的映射以不断最大化选择的通信参数。
实现发明方法的发送单元50的较佳实施例细节在图3中所示。被发送的数据52被送到数据处理块54,在那里它首先通过交织器和预编码器56。就本技术中已知的,交织器和预编码器56交织并预编码数据流52并把经交织和预编码的串发送到串并转换器58。转换器58从单个数据流中产生k个空间多路复用流SMi,其中i=1...k并且k是可变的,也就是流SMi的数量是可变的,符合1≤k≤N且k≤M的条件。换句话说,流SMi的最大数量k受发送天线TA1、TA2、...、TAM的数量M和接收天线RA1、RA2、...、RAN的数量N(见图4)的较小值限制。
k的值受自适应控制器60控制,它是控制单元62的一部分并连接到串并转换器58。如下所述,可以局部地通过自适应控制器60确定流SMi的数量k或它可从接收器进行通信得知。在大多数系统中,这个决定依赖于来自指示特性参数或从其中自适应控制器60可以导出特性参数的信息的接收器的反馈64。在其他系统中,例如时分双工(TDD)系统,其中信道是互易的,额外的反馈就没有必要了。在那种情况下就从发送单元自己的接收单元得到反馈,如虚线中所表示的。
k个流SMi的每一个通过S-T编码单元66相应的空间-时间编码器65(S-T编码器)。每个S-T编码器产生k’个编码流CSh,其中h=1...k’。根据自适应控制器60选择流SMi的数量,数量k’最少为1,最多为M。事实上,自适应控制器60也连接于S-T编码单元66也控制数量k’。
空间-时间编码是已知的技术,它结合了传统信道编码和天线分集。S-T编码分离编码数据流,在这种情况下每个空间多路流SMi变为k’个相关的数据串,在这种情况下就是编码流CSh,其中每一个被调制并同时从不同的发送天线TA发送。可以使用不同对于发送天线TA1、TA2、...、TAM数据映射的选择。所有发送天线TA可以用同样的调制形式和载波频率。可选择地,可以使用不同的调制或码元延迟。其他方法包括不同载波频率(多载频技术)或扩展编码的使用。在文献(见例如1998年3月IEEE信息论会刊第2号44卷V.Tarokh及其他人的《高数据率无线通信的空间-时间编码:性能指标和代码结构》和1998年10月IEEE关于通信所选领域期刊16卷第145-58页S.A.Alamouti的《无线通信的简单发送分集技术》)中进一步描述了S-T编码的概念。
根据本发明的方法,通过相应的S-T编码器65使用每个S-T编码并以k’个流CSh的形式输出。编码的约束长度和值k’可以根据在通信系统的操作中可以提供的计算复杂度确定。应该根据信道特性也就是根据特性参数值所反映的通信参数选择编码率和调制率。
在较佳实施例中控制单元62中的数据库68包含这组S-T编码以便根据数量k’和特性参数来使用。数据库68被连接到S-T编码单元以把这些编码提供给后面。自适应控制器60被连接到数据库68以控制S-T编码到S-T编码单元的传输。
每个存储在数据库68的S-T编码具有一个相关联的编码方案和调制方案。不同S-T编码的的编码率和调制率已被选择为不同的,以使每个S-T编码适应于由特性参数所指示的特定信道条件。可以进一步通过所优化的信道通信参数确定S-T编码编码率和调制率的选择。特别地,通信参数比如数据吞吐量需要选择具有较高速率的调制和编码的S-T码。
例如,如果反馈的特性参数是SINR并且目的是改进吞吐量,那么数据库68将包含按照发送天线TA1、TA2、...、TAM的数量M和接收天线RA1、RA2、...、RAN的数量N的所有可能的发送/接收配置的不同S-T编码的性能曲线(BER对SINR)。图8显示了三个典型S-T编码的性能。如所见,为了达到适合应用的(例如声音数据发送)BER值q,而主要平均SINR就不得不为值p或更小,这样只有S-T编码1和2是合适的。S-T编码3是不合适的因为在SINR值为p它的BER太高了。现在,当要最大化的通信参数是吞吐量时,就要在S-T编码1和S-T编码2之间进行附加的选择并选择最大化吞吐量的那个。本技术的普通技术人员明白可以使用这个过程或简单的过程最大化任何通信参数。此外,更佳地,数据库68包含必要的性能曲线以选择正确的S-T编码、k的值和G(z)矩阵组来使用。然而,也可以使用经验收集数据。
在较佳实施例中,k’等于发送天线TA1、TA2、...、TAM数量M。每个S-T编码器65使用自适应控制器60指示的S-T编码,并且各个S-T编码器65所使用的编码可以是相同或不同的。可选择地,k个空间多路复用流SMi也可以被S-T编码联合地提供只有一组k’个编码串CSh。联合S-T编码相对于单独的S-T编码会引起更高的计算复杂度。如果计算复杂度是可接受的,那么联合S-T编码是更好的。本技术的普通技术人员能在任何给定情况下作出适当的设计选择。
发送处理单元72接收编码串CSh并产生M个发送信号TS1、TS2、...、TSM发送。就本技术中众所周知的,上变频和RF放大单元74接收这M个发送信号TSp,对他们进行必要准备并从天线TA发送它们。
通过对所有输入k个M×M空间-时间(或可选的空间-频率)滤波矩阵组G(z)(M=k’)的应用进行编码流CSh的变换。矩阵组G(z)的选择是根据特性参数。为了这个原因自适应控制器60被连接到单元72以自适应控制矩阵组G(z)的选择。
更佳地,数据库68也被连接到单元72并包含对任何特定信道条件合适的矩阵组G(z)的存储参数或矩阵组G(z)本身。在后面的情况中也被连接到数据库68的自适应控制器60指令数据库在信道条件变化时把适当的矩阵组G(z)下载进发送处理单元72。进行矩阵组的选择以利于在接收器k个空间多路复用流SMi的可分离性。矩阵组G(z)可以结合分集技术比如延迟/转换分集或任何其他本技术中已知的组合技术。例如,当没有信道信息可用于发送单元50,例如在系统初始化时或任何其他时候,那么矩阵组G(z)(包括k个M×M的矩阵)由k个秩为MXk的矩阵组成以使这些矩阵所复盖的子空间是互相正交的以确保在接收单元80处k个流的可分离性。由本技术的普通技术人员就可以完成发现这样矩阵的任务。在操作期间,当特性参数变化时,就可使用其它矩阵组G(z)。
值得重要注意的是,S-T编码单元66和发送处理单元72一起对空间多路复用流SMi进行操作把它们映射为发送信号TSp,其中p=1...M,它们被分配给相应的发送天线TA1、TA2、...、TAM。换句话说,S-T编码单元66与发送处理单元72联合形成根据以上所述规则把流SMi映射到发送天线TA1、TA2、...、TAM的天线映射单元。通过自适应控制器60并借助于S-T编码和存储在数据库68中的矩阵G(z)按照由信道条件指示的特性参数的函数对映射调节。
就本技术中已知的,发送单元50较佳地还具有以虚线绘出的包括训练用数据的训练单元。训练用数据可以被插入到S-T编码单元66之前或之后的任何适当位置并被送到发送处理单元72。训练用数据可以在单独的控制信道中传送或与数据52一起传送。本技术的普通技术人员熟悉必要的技术和要求。
图4显示接收从发送单元50发送的信号的相应接收器80的框图。特别地,接收器80有N个接收天线RA1、RA2、...、RAN组成的阵列接收RSj接收信号,其中j=1...N。RF放大和向下变频块82发达和转换信号RSj并进行任何其他所需操作(例如抽样、模拟到数字转换)。然后,信号RSj被传递到矩阵信道估计器84和接收处理单元86两者中。
矩阵信道估算器84使用已知的训练模式,例如根据已知技术通过训练单元70提供的训练模式估计信道系数。在现在情况下,估计器84的输出是
A(z)=G(z)H(z),
其中G(z)发送处理块72使用的矩阵,而H(z)是纯信道系数的矩阵。G(z)是一组M×M的矩阵而H(z)是一个M×N的矩阵。结果矩阵
Figure A0081893700132
是一个M×N的矩阵,表示在数字化后的接收信号RS1、RS2、...、RSN信道估算。后面使用通过估算器84提供给接收处理块86的信道估算来恢复k个空间多路复用流SMi。事实上,任何已知的接收处理技术比如迫零(ZF)、MMSE、LS、ML等等都可用于处理接收信号RS1、RS2、...、RSN
恢复的k个编码流被提供给S-T解码单元88和接收流单元90的信号统计。S-T解码器有将发送单元50的S-T编码器65反向的S-T解码器。使用的S-T编码由数据库92提供给单元88。以下参照图5将会更详细地讨论S-T解码。
信号统计单元90分析通过接收处理块86转换为k个流的接收信号RSj以估算特性参数。在较佳实施例中,单元90是在时间上平均信号统计量的平均单元。单元90计算k个流中每一个的信号统计量,包括信号-干扰噪声比(SINR)、信噪比(SNR)、功率电平、电平交叉速率(LCR)、在特定阈值和接收阈值的信号电平交叉持续时间或其他信号参数。
例如,当用ZF(迫零)方法进行接收处理时,单元90根据以下算法计算SINR: SINR = < | | A ^ - 1 * Y - X | | 2 > ,
其中括号表示期望值,X是发送序列而Y是接收序列。LCR是信号电平下降到设定电平以下的速率。LCR能被计算以用于不同信号电平阈值。SINR和LCR都给出了信道差错特性的指示。通过单元90计算和平均这些统计量所在的窗尺寸(持续时间)可以根据接收单元80所看到的信道种类改变。
对于特定的阈值电平和LCR差错可能性将根据使用的S-T码的种类(它包括S-T码编码和调制方面)和发送单元50使用的空间多路复用流SMi的数量k。k的值由在接收单元50处的空间标识的可分离性指定。
这样,对于可分离的k个空间多路复用流SMi的S-T码的选择是根据在特定阈值电平和最大可接受错误率的LCR和LC的持续时间。平均SINR也给出相似的信息种类。这个差错信息被单元90作为特性参数直接使用或被用于导出特性参数。其他信号准则可以相似的方式用于由单元90直接用作特性参数或被用于导出特性参数。
可选择地并且更佳地,除了单元90输出流单元94的信号统计量被用于分析从S-T解码单元88得到的重构流SMi。单元94再一次对重构流SMi进行相同的统计计算以得到信号统计量,包括号-干扰噪声比(SINR)、信噪比(SNR)、功率电平、电平交叉速率(LCR)、信号电平交叉持续时间和接收阈值或其他信号参数。同时,重构流SMi通过并串转换器96被转换为串行流。然后,它们通过去交织器和解码器98去交织和解码以恢复原先从发送单元50发送的数据52’(撇’表示由于传输差错恢复数据可能与原始数据不同)。
本发明的方法使用特性参数或如上所述得到的参数来调节至少由发送单元50的串并转换器58产生的空间多路复用流SMi的数量k。更好地,特性参数也被用于控制单元66的S-T编码(例如数量k’的选择)以及发送处理,也就是发送单元50的发送处理单元72的矩阵组G(z)的选择。
在正常的操作期间,发送单元50在系统初始化时选择G(z)、k、k’和S-T码。然后当信道变化时这些参数也被更新。发送单元50把控制信息102(见图5),包括使用的S-T码、值k、发送处理单元应用的矩阵组G(z)等等,有规律地发送到接收单元80。可选择地,在系统初始化的时间内信息只被发送一次,然后根据需要再更新(例如只当其中一条信息变化时)。
图5A更详细地说明了如何完成G(z)、k、k’和S-T码的自适应控制。串S1到Sk被提供给单元90,同时重构的空间多路复用流SM1到SMk被提供到单元94。单元90、94都照以上所述计算信号统计量。然后,单元90、94把它们的信号统计或特性参数经通信传送给S-T码查询块100。根据这些块100作出最适宜S-T码和使用的k值的决定。这个决定以反馈64的形式传送到发送器50。可选择地,块100传送以反馈64的形式把信号统计量传送到发送单元50的自适应控制60。在这种情况下,自适应控制60选择适合的S-T码和k值。通过基于反馈64由自适应控制60确定合适的矩阵组G(z)的使用。
当然,为了恢复数据52,接收器80必须使用合适的S-T码以及知道数量k。如以上提到的,这个信息可用于它,信息或者来自块100,它能提供这个信息到被连接于S-T解码单元88的S-T码数据库92(见图4),或者来自由发送单元50发送的控制信道信息102。假如使用了控制信道信息102,那么S-T码、k值指示器104接收信息把它通信传送给数据库92。在系统启动期间指示器104以最后所用的配置开始,或以k=1和特定的S-T码与G(z)矩阵组开始。可选择地,它可以以任何同意的配置开始。当然,在最大化通信参数的过程期间将会更新配置。
确定k、S-T码的调整和矩阵组G(z)的选择、是通过块100建议还是通过自适应控制60决定来最大化或最优化在变化信道条件下的通信参数。通常要最大化的通信参数是信道容量、信号特性、SNR或吞吐量。通过选择选择k可能的最大值和高吞吐量的S-T码(高调制率和低编码开销)最大化信道容量。k的减少增加了分集的阶数。在这种情况下,信号特性改进了但通过量减少了。如果k=1就最大化了SNR,但这样最小化了信道容量。因此如果信道容量和信号特性都要最大化,那么自适应控制块60(或块100)必需确定最优的k。
此,假如在使用频率再利用的系统(例如使用频率再利用的蜂窝网络)中实现本发明的方法,那么接收单元就可能遇到干扰。此外,就本技术已知的,更好地是与干扰减轻结合实现发明的方法。在那种情况下,要在干扰减轻一起执行的方式中进行S-T码、数量k和矩阵组G(z)的选择。当与干扰减轻一起实现本发明的方法时,会引起分集或空间多路化的阶数的一些减少。
在可选实施例中,S-T解码单元88可以是产生k个重构流SMi的联合S-T解码器,而不是如图4中所示的S-T解码器组89。联合或单独的解码方案是根据发送单元50使用的编码策略以及可以被重新配置。
在可选实施例中不同种类的编码器可以代替S-T编码器。例如,解码单元可以是空间-频率编码器和自适应调制率编码器或其他合适的编码设备。空间-时间和空间-频率编码器可以使用不同的编码和调制率。
在另一个实施例中,如图5B中所示,接收单元80可以利用附加的数据分析块110和122在并串转换后并在去交织和最后解码步骤后计算附加的数据统计量。这些数据统计可以是BER或数据包错误率。这个信息可以被反馈到发送单元50以调节参数k、k’、S-T编码和矩阵组G(z)的选择。可选择地,这个信息可被送到单元100以局部确定参数。
系统是基于任何多址技术包括TDMA、FDMA、CDMA和0FDMA。例如,在图6和7中说明了对于在OFDM系统中实现发送单元50和接收单元80必要的适配。特别的,图6说明了在OFDM系统中操作的发送单元50的适配。在这种情况下,来自发送处理单元72的发送信号必须被串并转换器(S/P)120转换到并行。在这种情况下训练单元70也把训练模式直接提供到S/P转换器120。接下来,并行发送信号通过IFFT元件122进行快速傅立叶反变换并再由并串转换器(P/S)124转换成串行。然后,信号被向上变频及放大以从发送天线TA1、TA2、...、TAM进行RF发送。
图7说明了对于接收由如图6中所示适配的发送单元50发送的OFDM信号的接收单元80必要的适配。特别地,通过接收天线RA1、RA2、...、RAN接收接收信号并通过相应的块进行下变频和放大。然后信号通过S/P转换器126从串行转换成并行。快速傅立叶变换(FFT)块1281到N随后变换信号并把它们传送到空间-频率(S-F)矩阵信道估算器130和接收处理块132。从那里,接收信号的处理就如在接受单元80那样进行。
对于本技术的普通技术人员清楚的是以上实施例可以不离开发明的范围以许多方式修改。因此,应该通过以下权利要求和合法的等价物确定发明的范围。

Claims (34)

1.一种使在有M个发送天线的发送单元和有N个接收天线的接收单元之间的信道的通信参数最大化的方法,所述方法包含以下步骤:
a)处理所述数据以产生并行空间多路复用流SMi,其中i=1...k;
b)把所述空间多路复用流SMi映射到发送信号TSp,其中p=1...M,以从所述M个发送天线通过所述信道发送到所述接收器;
c)由所述N个接收天线接收接收信号RSj,其中j=1...N;
d)估算所述接收信号RSj的特性参数;以及
e)使用所述特性参数来调节k以使所述信道的所述通信参数最大化。
2.如权利要求1所述的方法,其特征在于每个所述空间多路复用流SMi都通过编码单元处理以产生编码流CSh,其中h=1...k’。
3.如权利要求2所述的方法,其特征在于在所述发送器外使用所述特性参数来调节所述编码单元的编码。
4.如权利要求2所述的方法,其特征在于在所述发送器外使用所述特性参数来调节k’。
5.如权利要求2所述的方法,其特征在于从包括空间-时间编码器、空间-频率编码器、自适应调制率编码器的组中选择所述编码单元。
6.如权利要求5所述的方法,其特征在于所述空间-时间编码器和所述空间-频率编码器使用不同的编码率和调制率。
7.如权利要求1所述的方法,其特征在于进一步包含处理所述接收信号RSj以再产生所述空间多路复用流SMi的接收步骤。
8.如权利要求7所述的方法,其特征在于从所述接收处理的空间多路复用流SMi中得到所述特性参数。
9.如权利要求8所述的方法,其特征在于由统计单元导出所述特性参数。
10.如权利要求8所述的方法,其特征在于从包括信号-干扰噪声比、信噪比、功率电平、电平交叉率、电平交叉持续时间的组中选择所述特性参数。
11.如权利要求1所述的方法,其特征在于进一步包含处理所述接收信号RSj以重构所述数据并从所述数据中得到所述特性参数的步骤。
12.如权利要求11所述的方法,其特征在于从包括误码率和包错误率的组中选择所述特性参数。
13.如权利要求1所述的方法,其特征在于所述映射步骤进一步包含由发送处理块进行发送处理的步骤,并且使用所述特性参数以调节所述发送处理块的发送处理。
14.如权利要求1所述的方法,其特征在于所述特性参数被反馈到所述发送器。
15.如权利要求1所述的方法,其特征在于所述处理所述数据的步骤包含从包括自适应调制、自适应编码、空间-时间编码和空间-频率编码的组中选择的技术。
16.如权利要求1所述的方法,其特征在于根据至少一种从包括TDMA、FDMA、CDMA、OFDMA的组中选择的多路技术格式化所述发送信号TSp。
17.如权利要求1所述的方法,其特征在于从包括数据容量、信号特性和吞吐量的组中选择所述通信参数。
18.如权利要求1所述的方法,其特征在于所述接收单元和所述发送单元都属于蜂窝通信系统。
19.如权利要求18所述的方法,其特征在于在所述蜂窝通信系统的下行链路中使用。
20.如权利要求18所述的方法,其特征在于在所述蜂窝通信系统的上行链路中使用。
21.一种具有自适应最大化的信道通信参数的通信系统,在其中数据在有M个发送天线的发送单元和有N个接收天线的接收单元之间传输,所述的发送单元包含:
a)处理所述数据以产生并行空间多路复用流SMi的处理装置,其中i=1...k;
b)天线映射装置,用于把所述空间多路复用流SMi转换成发送信号TSp,其中p=1...M,并通过所述信道从所述M个发送天线发送所述发送信号TSp
所述接收单元接收接收信号RSj,其中j=1...N,并且所述通信系统包含:
a)估算所述接收信号RSj的特性参数的装置;以及
b)根据所述特性参数来调节k以使所述信道的所述通信参数最大化的装置。
22.如权利要求21所述的通信系统,其特征在于所述估算所述特性参数的装置包含统计单元。
23.如权利要求21所述的通信系统,其特征在于所述估算所述特性参数的装置被置于所述接收单元中。
24.如权利要求21所述的通信系统,其特征在于所述估算所述特性参数的装置被置于所述发送单元中。
25.如权利要求21所述的通信系统,其特征在于进一步包含在所述发送单元中的处理所述空间多路复用流SMi以产生编码流CSh,其中h=1...k’的编码单元。
26.如权利要求21所述的通信系统,其特征在于所述调节k的装置进一步包含调节k’的机制。
27.如权利要求25所述的通信系统,其特征在于从包括空间-时间编码器、空间-频率编码器、自适应调制率编码器的组中选择所述编码单元。
28.如权利要求25所述的通信系统,其特征在于进一步包含与所述编码单元和所述天线映射装置进行通信的码和天线映射参数的数据库。
29.如权利要求25所述的通信系统,其特征在于进一步包含与所述处理装置、所述编码单元和所述天线映射装置进行通信的自适应控制器,所述自适应控制器根据所述特性参数调节所述处理装置、所述编码单元和所述天线映射装置。
30.如权利要求21所述的通信系统,其特征在于所述调节k的装置被置于所述发送单元。
31.如权利要求21所述的通信系统,其特征在于进一步包含与所述处理装置和所述天线映射装置进行通信的自适应控制器,所述自适应控制器根据所述特性参数调节所述处理装置和所述天线映射装置。
32.如权利要求21所述的通信系统,其特征在于所述通信系统根据至少一种从包括TDMA、FDMA、CDMA、OFDMA的组中选择的多路技术进行操作。
33.如权利要求21所述的通信系统,其特征在于所述通信系统上蜂窝通信系统。
34.如权利要求21所述的通信系统,其特征在于使用了多载波调制。
CN00818937.4A 1999-12-15 2000-12-05 使用多个天线和自适应控制最大化通信参数的方法和无线系统 Expired - Fee Related CN1207852C (zh)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US09/464,372 US6351499B1 (en) 1999-12-15 1999-12-15 Method and wireless systems using multiple antennas and adaptive control for maximizing a communication parameter
US09/464,372 1999-12-15

Publications (2)

Publication Number Publication Date
CN1435015A true CN1435015A (zh) 2003-08-06
CN1207852C CN1207852C (zh) 2005-06-22

Family

ID=23843684

Family Applications (1)

Application Number Title Priority Date Filing Date
CN00818937.4A Expired - Fee Related CN1207852C (zh) 1999-12-15 2000-12-05 使用多个天线和自适应控制最大化通信参数的方法和无线系统

Country Status (8)

Country Link
US (2) US6351499B1 (zh)
EP (2) EP1628414A3 (zh)
CN (1) CN1207852C (zh)
AU (1) AU2061501A (zh)
BR (1) BR0016772A (zh)
DE (1) DE60023032T2 (zh)
MX (1) MXPA02006019A (zh)
WO (1) WO2001045300A1 (zh)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100592672C (zh) * 2005-11-30 2010-02-24 上海贝尔阿尔卡特股份有限公司 空时编码/译码模式的动态切换方法及装置
CN1645846B (zh) * 2003-12-24 2010-09-29 三星电子株式会社 正交频分复用通信系统中的数据发送装置及方法
CN1886916B (zh) * 2003-12-04 2012-06-27 巴比禄股份有限公司 无线lan发送接收装置、无线lan发送接收方法
CN101719779B (zh) * 2004-06-23 2013-06-26 三星电子株式会社 在无线通信系统中使用多个天线接收分组数据的设备和方法
CN101374136B (zh) * 2007-08-17 2015-05-20 英特尔移动通信有限责任公司 发送和接收通信信号的方法及发送和接收通信信号的装置
US9178580B2 (en) 2005-04-07 2015-11-03 Interdigital Technology Corporation Method and apparatus for antenna mapping selection in MIMO-OFDM wireless networks
CN106851851A (zh) * 2003-12-23 2017-06-13 英特尔公司 使用空分多址(sdma)同时和多个移动站通信的无线访问点
CN112018526A (zh) * 2020-07-18 2020-12-01 中国人民解放军战略支援部队信息工程大学 基于空时异构天线阵列的信号接收方法

Families Citing this family (307)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6618454B1 (en) * 1998-02-06 2003-09-09 At&T Corp. Diversity coded OFDM for high data-rate communication
US20030138058A1 (en) * 1998-02-06 2003-07-24 Dakshi Agrawal Diversity coded OFDM for high data-rate communication
GB9901789D0 (en) * 1998-04-22 1999-03-17 Koninkl Philips Electronics Nv Antenna diversity system
US7154970B1 (en) * 1999-02-10 2006-12-26 At&T Corp. Differential transmitter diversity technique for wireless communications
US7864902B1 (en) * 2003-04-28 2011-01-04 At&T Corp. Differential transmitter diversity technique for wireless communications
US7952511B1 (en) 1999-04-07 2011-05-31 Geer James L Method and apparatus for the detection of objects using electromagnetic wave attenuation patterns
US6285720B1 (en) * 1999-05-28 2001-09-04 W J Communications, Inc. Method and apparatus for high data rate wireless communications over wavefield spaces
US7139592B2 (en) * 1999-06-21 2006-11-21 Arraycomm Llc Null deepening for an adaptive antenna based communication station
US6898248B1 (en) * 1999-07-12 2005-05-24 Hughes Electronics Corporation System employing threaded space-time architecture for transporting symbols and receivers for multi-user detection and decoding of symbols
US6067290A (en) 1999-07-30 2000-05-23 Gigabit Wireless, Inc. Spatial multiplexing in a cellular network
WO2001010156A1 (en) 1999-07-30 2001-02-08 Iospan Wireless, Inc. Spatial multiplexing in a cellular network
US6757265B1 (en) * 1999-07-30 2004-06-29 Iospan Wireless, Inc. Subscriber unit in a hybrid link incorporating spatial multiplexing
US6804211B1 (en) 1999-08-03 2004-10-12 Wi-Lan Inc. Frame structure for an adaptive modulation wireless communication system
CN1118200C (zh) * 1999-08-10 2003-08-13 信息产业部电信科学技术研究院 基于智能天线和干扰抵销的基带处理方法
US6560295B1 (en) * 1999-09-15 2003-05-06 Hughes Electronics Corporation Method of generating space-time codes for generalized layered space-time architectures
JP3416597B2 (ja) * 1999-11-19 2003-06-16 三洋電機株式会社 無線基地局
US6888809B1 (en) * 2000-01-13 2005-05-03 Lucent Technologies Inc. Space-time processing for multiple-input, multiple-output, wireless systems
US6650653B1 (en) * 2000-01-19 2003-11-18 Mitsubishi Electric Research Laboratories, Inc. Software-based digital receiver adaptable to multiple multiplexing schemes
WO2001056194A1 (en) * 2000-01-26 2001-08-02 Vyyo, Ltd. Space diversity method and system for broadband wireless access
GB0029426D0 (en) * 2000-12-02 2001-01-17 Koninkl Philips Electronics Nv Radio communication system
SG108240A1 (en) * 2000-02-23 2005-01-28 Ntt Docomo Inc Multi-carrier cdma radio transmitting method and apparatus, and channel estimation method and apparatus for multi-carrier cdma radio transmitting system
JP3826653B2 (ja) * 2000-02-25 2006-09-27 Kddi株式会社 無線通信システムのサブキャリア割当方法
US7164725B2 (en) * 2000-03-10 2007-01-16 Motorola, Inc. Method and apparatus for antenna array beamforming
US6700882B1 (en) * 2000-03-27 2004-03-02 Telefonaktiebolaget Lm Ericsson (Publ) Method and apparatus for increasing throughput and/or capacity in a TDMA system
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
US8363744B2 (en) 2001-06-10 2013-01-29 Aloft Media, Llc Method and system for robust, secure, and high-efficiency voice and packet transmission over ad-hoc, mesh, and MIMO communication networks
US7248841B2 (en) * 2000-06-13 2007-07-24 Agee Brian G Method and apparatus for optimization of wireless multipoint electromagnetic communication networks
US6778612B1 (en) * 2000-08-18 2004-08-17 Lucent Technologies Inc. Space-time processing for wireless systems with multiple transmit and receive antennas
US6937592B1 (en) * 2000-09-01 2005-08-30 Intel Corporation Wireless communications system that supports multiple modes of operation
US8339935B2 (en) 2000-09-01 2012-12-25 Apple Inc. Adaptive time diversity and spatial diversity for OFDM
US6985434B2 (en) * 2000-09-01 2006-01-10 Nortel Networks Limited Adaptive time diversity and spatial diversity for OFDM
US7295509B2 (en) 2000-09-13 2007-11-13 Qualcomm, Incorporated Signaling method in an OFDM multiple access system
US9130810B2 (en) 2000-09-13 2015-09-08 Qualcomm Incorporated OFDM communications methods and apparatus
US7031371B1 (en) * 2000-09-25 2006-04-18 Lakkis Ismail A CDMA/TDMA communication method and apparatus for wireless communication using cyclic spreading codes
US7339955B2 (en) * 2000-09-25 2008-03-04 Pulse-Link, Inc. TDMA communication method and apparatus using cyclic spreading codes
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
US7023933B2 (en) 2000-10-20 2006-04-04 Matsushita Electric Industrial Co., Ltd. Radio communication apparatus
US7342875B2 (en) * 2000-11-06 2008-03-11 The Directv Group, Inc. Space-time coded OFDM system for MMDS applications
US6567387B1 (en) * 2000-11-07 2003-05-20 Intel Corporation System and method for data transmission from multiple wireless base transceiver stations to a subscriber unit
WO2002041520A2 (en) 2000-11-15 2002-05-23 Ensemble Communications, Inc. Improved frame structure for a communication system using adaptive modulation
US8634481B1 (en) * 2000-11-16 2014-01-21 Alcatel Lucent Feedback technique for wireless systems with multiple transmit and receive antennas
US8670390B2 (en) 2000-11-22 2014-03-11 Genghiscomm Holdings, LLC Cooperative beam-forming in wireless networks
SE0004403L (sv) * 2000-11-29 2002-05-30 Ericsson Telefon Ab L M Metoder och anordningar i ett telekommunikationssystem
US6947748B2 (en) 2000-12-15 2005-09-20 Adaptix, Inc. OFDMA with adaptive subcarrier-cluster configuration and selective loading
CA2431849C (en) * 2000-12-15 2013-07-30 Broadstrom Telecommunications, Inc. Multi-carrier communications with group-based subcarrier allocation
FI20010079A (fi) * 2001-01-12 2002-07-13 Nokia Corp Paikannusmenetelmä ja radiojärjestelmä
US8009667B1 (en) * 2001-01-16 2011-08-30 Wi—LAN, Inc. Packing source data packets into transporting packets with fragmentation
KR100645427B1 (ko) * 2001-02-08 2006-11-14 삼성전자주식회사 채널 특성에 따라 불균등한 빔 폭을 형성하는 오에프디엠수신 장치와 이를 적용한 통신장치 및 방법
US7116722B2 (en) * 2001-02-09 2006-10-03 Lucent Technologies Inc. Wireless communication system using multi-element antenna having a space-time architecture
US20020118783A1 (en) * 2001-02-26 2002-08-29 Peter Cripps Smart antenna based spectrum multiplexing using a pilot signal
JP2002271266A (ja) * 2001-03-09 2002-09-20 Nec Corp Cdma基地局および送信ダイバーシチ制御方法
US7110381B1 (en) * 2001-03-19 2006-09-19 Cisco Systems Wireless Networking (Australia) Pty Limited Diversity transceiver for a wireless local area network
US20020136287A1 (en) * 2001-03-20 2002-09-26 Heath Robert W. Method, system and apparatus for displaying the quality of data transmissions in a wireless communication system
US6771706B2 (en) * 2001-03-23 2004-08-03 Qualcomm Incorporated Method and apparatus for utilizing channel state information in a wireless communication system
US7386076B2 (en) * 2001-03-29 2008-06-10 Texas Instruments Incorporated Space time encoded wireless communication system with multipath resolution receivers
US8290098B2 (en) * 2001-03-30 2012-10-16 Texas Instruments Incorporated Closed loop multiple transmit, multiple receive antenna wireless communication system
US7145959B2 (en) * 2001-04-25 2006-12-05 Magnolia Broadband Inc. Smart antenna based spectrum multiplexing using existing pilot signals for orthogonal frequency division multiplexing (OFDM) modulations
US10355720B2 (en) 2001-04-26 2019-07-16 Genghiscomm Holdings, LLC Distributed software-defined radio
US9819449B2 (en) 2002-05-14 2017-11-14 Genghiscomm Holdings, LLC Cooperative subspace demultiplexing in content delivery networks
US10425135B2 (en) * 2001-04-26 2019-09-24 Genghiscomm Holdings, LLC Coordinated multipoint systems
US10931338B2 (en) 2001-04-26 2021-02-23 Genghiscomm Holdings, LLC Coordinated multipoint systems
US7801247B2 (en) * 2001-05-01 2010-09-21 Texas Instruments Incorporated Multiple input, multiple output system and method
US7778355B2 (en) * 2001-05-01 2010-08-17 Texas Instruments Incorporated Space-time transmit diversity
US20020177446A1 (en) * 2001-05-23 2002-11-28 Alex Bugeja System and method for providing variable transmission bandwidth over communications channels
BR0210131A (pt) * 2001-05-31 2004-06-08 Magnolia Broadband Inc Dispositivo de comunicação com antena inteligente usando um sinal de indicação de qualidade
US8249187B2 (en) 2002-05-09 2012-08-21 Google Inc. System, method and apparatus for mobile transmit diversity using symmetric phase difference
US7167526B2 (en) * 2001-06-07 2007-01-23 National Univ. Of Singapore Wireless communication apparatus and method
US20030026348A1 (en) * 2001-06-07 2003-02-06 National University Of Singapore Wireless communication apparatus and method
KR100703295B1 (ko) * 2001-08-18 2007-04-03 삼성전자주식회사 이동통신시스템에서 안테나 어레이를 이용한 데이터 송/수신 장치 및 방법
KR100615888B1 (ko) 2001-08-25 2006-08-25 삼성전자주식회사 안테나 어레이를 포함하는 이동 통신 장치 및 방법
EP1289179A1 (en) * 2001-08-28 2003-03-05 Lucent Technologies Inc. A wireless telecommunications network, a user terminal therefor, a base station therefor, and a method of telecommunication
DE10142404B4 (de) * 2001-08-31 2005-09-08 Deutsches Zentrum für Luft- und Raumfahrt e.V. Verfahren zur Funkübertragung von digitalen Nachrichtensignalen
US7149254B2 (en) * 2001-09-06 2006-12-12 Intel Corporation Transmit signal preprocessing based on transmit antennae correlations for multiple antennae systems
US7269224B2 (en) * 2001-09-17 2007-09-11 Bae Systems Information And Electronic Systems Integration Inc. Apparatus and methods for providing efficient space-time structures for preambles, pilots and data for multi-input, multi-output communications systems
US7024163B1 (en) 2001-09-28 2006-04-04 Arraycomm Llc Method and apparatus for adjusting feedback of a remote unit
US7280504B2 (en) * 2001-09-28 2007-10-09 Kabushiki Kaisha Toshiba OFDM transmitting and receiving apparatus
US20030067890A1 (en) * 2001-10-10 2003-04-10 Sandesh Goel System and method for providing automatic re-transmission of wirelessly transmitted information
US6693973B2 (en) * 2001-10-17 2004-02-17 Nokia Corporation Apparatus, and associated method, for forming a systematic, recursive, space-time code
KR100596413B1 (ko) 2001-10-24 2006-07-03 삼성전자주식회사 송/수신 다중 안테나를 포함하는 이동 통신 장치 및 방법
US7171229B2 (en) * 2001-10-31 2007-01-30 Koninklijke Philips Electronics N.V. Method for operating a radio communication system
US7164649B2 (en) * 2001-11-02 2007-01-16 Qualcomm, Incorporated Adaptive rate control for OFDM communication system
US7221654B2 (en) * 2001-11-13 2007-05-22 Nokia Corporation Apparatus, and associated method, for selecting radio communication system parameters utilizing learning controllers
US7012883B2 (en) * 2001-11-21 2006-03-14 Qualcomm Incorporated Rate selection for an OFDM system
US7336719B2 (en) * 2001-11-28 2008-02-26 Intel Corporation System and method for transmit diversity base upon transmission channel delay spread
US7317756B2 (en) * 2001-12-06 2008-01-08 Pulse-Link, Inc. Ultra-wideband communication apparatus and methods
US7483483B2 (en) * 2001-12-06 2009-01-27 Pulse-Link, Inc. Ultra-wideband communication apparatus and methods
US7349439B2 (en) * 2001-12-06 2008-03-25 Pulse-Link, Inc. Ultra-wideband communication systems and methods
US7257156B2 (en) * 2001-12-06 2007-08-14 Pulse˜Link, Inc. Systems and methods for equalization of received signals in a wireless communication network
US7349478B2 (en) * 2001-12-06 2008-03-25 Pulse-Link, Inc. Ultra-wideband communication apparatus and methods
US7391815B2 (en) * 2001-12-06 2008-06-24 Pulse-Link, Inc. Systems and methods to recover bandwidth in a communication system
US7450637B2 (en) * 2001-12-06 2008-11-11 Pulse-Link, Inc. Ultra-wideband communication apparatus and methods
US20050058180A1 (en) * 2001-12-06 2005-03-17 Ismail Lakkis Ultra-wideband communication apparatus and methods
US7289494B2 (en) * 2001-12-06 2007-10-30 Pulse-Link, Inc. Systems and methods for wireless communication over a wide bandwidth channel using a plurality of sub-channels
US7406647B2 (en) * 2001-12-06 2008-07-29 Pulse-Link, Inc. Systems and methods for forward error correction in a wireless communication network
US20050201473A1 (en) * 2001-12-06 2005-09-15 Ismail Lakkis Systems and methods for receiving data in a wireless communication network
US7403576B2 (en) 2001-12-06 2008-07-22 Pulse-Link, Inc. Systems and methods for receiving data in a wireless communication network
US20050053121A1 (en) * 2001-12-06 2005-03-10 Ismail Lakkis Ultra-wideband communication apparatus and methods
US20050094709A1 (en) * 2001-12-06 2005-05-05 Ismail Lakkis Ultra-wideband communication apparatus and methods
US20050152483A1 (en) * 2001-12-06 2005-07-14 Ismail Lakkis Systems and methods for implementing path diversity in a wireless communication network
US8045935B2 (en) * 2001-12-06 2011-10-25 Pulse-Link, Inc. High data rate transmitter and receiver
US6823180B2 (en) * 2001-12-12 2004-11-23 Motorola, Inc. Method and apparatus for adapting antenna visibility in a wireless communications unit
US7020110B2 (en) * 2002-01-08 2006-03-28 Qualcomm Incorporated Resource allocation for MIMO-OFDM communication systems
US7245598B2 (en) * 2002-02-21 2007-07-17 Qualcomm Incorporated Feedback of channel quality information
US6873651B2 (en) * 2002-03-01 2005-03-29 Cognio, Inc. System and method for joint maximal ratio combining using time-domain signal processing
US6862456B2 (en) * 2002-03-01 2005-03-01 Cognio, Inc. Systems and methods for improving range for multicast wireless communication
US6687492B1 (en) * 2002-03-01 2004-02-03 Cognio, Inc. System and method for antenna diversity using joint maximal ratio combining
US6785520B2 (en) 2002-03-01 2004-08-31 Cognio, Inc. System and method for antenna diversity using equal power joint maximal ratio combining
AU2003219882A1 (en) * 2002-03-01 2003-09-16 Cognio, Inc. System and method for joint maximal ratio combining
FR2837044A1 (fr) * 2002-03-11 2003-09-12 St Microelectronics Sa Procede de modulation et de determination du nombre de bits a transmettre sur un canal de transmission
US6871049B2 (en) * 2002-03-21 2005-03-22 Cognio, Inc. Improving the efficiency of power amplifiers in devices using transmit beamforming
JP4166026B2 (ja) 2002-03-22 2008-10-15 三洋電機株式会社 無線装置、空間パス制御方法および空間パス制御プログラム
US7012978B2 (en) * 2002-03-26 2006-03-14 Intel Corporation Robust multiple chain receiver
US7103325B1 (en) * 2002-04-05 2006-09-05 Nortel Networks Limited Adaptive modulation and coding
US7292647B1 (en) * 2002-04-22 2007-11-06 Regents Of The University Of Minnesota Wireless communication system having linear encoder
US10142082B1 (en) 2002-05-14 2018-11-27 Genghiscomm Holdings, LLC Pre-coding in OFDM
US10200227B2 (en) 2002-05-14 2019-02-05 Genghiscomm Holdings, LLC Pre-coding in multi-user MIMO
US9628231B2 (en) 2002-05-14 2017-04-18 Genghiscomm Holdings, LLC Spreading and precoding in OFDM
US10644916B1 (en) 2002-05-14 2020-05-05 Genghiscomm Holdings, LLC Spreading and precoding in OFDM
US7327800B2 (en) 2002-05-24 2008-02-05 Vecima Networks Inc. System and method for data detection in wireless communication systems
GB0212165D0 (en) 2002-05-27 2002-07-03 Nokia Corp A wireless system
US7577085B1 (en) 2002-06-03 2009-08-18 Marvell International Ltd. Multicarrier transmit diversity
US7181246B2 (en) * 2002-06-05 2007-02-20 Neocific, Inc. Adaptive communications system and method
US20030235252A1 (en) * 2002-06-19 2003-12-25 Jose Tellado Method and system of biasing a timing phase estimate of data segments of a received signal
JP3751265B2 (ja) * 2002-06-20 2006-03-01 松下電器産業株式会社 無線通信システムおよびスケジューリング方法
US7164726B1 (en) * 2002-06-28 2007-01-16 Arraycomm, Llc. Broadcast burst using spatial diversity for a radio communications system
US20040008648A1 (en) * 2002-07-11 2004-01-15 Schmidl Timothy M. Diversity decisions for downlink antenna transmission
EP1983651B1 (en) * 2002-07-30 2014-11-05 IPR Licensing, Inc. Device for multiple-input multiple output (MIMO) radio communication
US7394754B2 (en) * 2002-08-01 2008-07-01 Mediatek Inc. System and method for transmitting data in a multiple-branch transmitter-diversity orthogonal frequency-division multiplexing (OFDM) system
US20040116077A1 (en) * 2002-08-08 2004-06-17 Kddi Corporation Transmitter device and receiver device adopting space time transmit diversity multicarrier CDMA, and wireless communication system with the transmitter device and the receiver device
US7369485B2 (en) * 2002-08-19 2008-05-06 Conexant, Inc. Wireless receiver for sorting packets
US8194770B2 (en) 2002-08-27 2012-06-05 Qualcomm Incorporated Coded MIMO systems with selective channel inversion applied per eigenmode
JP3679075B2 (ja) 2002-09-13 2005-08-03 松下電器産業株式会社 無線送信装置および無線送信方法
US7349438B2 (en) * 2002-09-17 2008-03-25 Lucent Technologies Inc. Formatter, method of formatting encoded symbols and wireless communication system employing the same
US7397864B2 (en) * 2002-09-20 2008-07-08 Nortel Networks Limited Incremental redundancy with space-time codes
US20040121730A1 (en) * 2002-10-16 2004-06-24 Tamer Kadous Transmission scheme for multi-carrier MIMO systems
US6873606B2 (en) * 2002-10-16 2005-03-29 Qualcomm, Incorporated Rate adaptive transmission scheme for MIMO systems
US8208364B2 (en) * 2002-10-25 2012-06-26 Qualcomm Incorporated MIMO system with multiple spatial multiplexing modes
US8320301B2 (en) * 2002-10-25 2012-11-27 Qualcomm Incorporated MIMO WLAN system
US7002900B2 (en) 2002-10-25 2006-02-21 Qualcomm Incorporated Transmit diversity processing for a multi-antenna communication system
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
US8570988B2 (en) * 2002-10-25 2013-10-29 Qualcomm Incorporated Channel calibration for a time division duplexed communication system
US20040081131A1 (en) 2002-10-25 2004-04-29 Walton Jay Rod OFDM communication system with multiple OFDM symbol sizes
US8169944B2 (en) * 2002-10-25 2012-05-01 Qualcomm Incorporated Random access for wireless multiple-access communication systems
US8170513B2 (en) * 2002-10-25 2012-05-01 Qualcomm Incorporated Data detection and demodulation for wireless communication systems
US8134976B2 (en) 2002-10-25 2012-03-13 Qualcomm Incorporated Channel calibration for a time division duplexed communication system
US7986742B2 (en) 2002-10-25 2011-07-26 Qualcomm Incorporated Pilots for MIMO communication system
US8412106B2 (en) 2002-11-04 2013-04-02 Xr Communications, Llc Directed wireless communication
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
DE50308058D1 (de) * 2003-01-31 2007-10-11 Phoenix Contact Gmbh & Co Verfahren und Vorrichtung zur Überwachung einer sicheren Übertragung von Datenpaketen
KR100595584B1 (ko) * 2003-02-12 2006-07-03 엘지전자 주식회사 무선 송수신 장치
US8149810B1 (en) 2003-02-14 2012-04-03 Marvell International Ltd. Data rate adaptation in multiple-in-multiple-out systems
KR100571862B1 (ko) * 2003-02-17 2006-04-17 삼성전자주식회사 다중 안테나를 포함하는 이동통신 시스템 및 그 방법
US7221722B2 (en) * 2003-02-27 2007-05-22 Motorola, Inc. Method and apparatus for reducing interference within a communication system
US8185075B2 (en) * 2003-03-17 2012-05-22 Broadcom Corporation System and method for channel bonding in multiple antenna communication systems
US7327795B2 (en) 2003-03-31 2008-02-05 Vecima Networks Inc. System and method for wireless communication systems
US20040192216A1 (en) * 2003-03-31 2004-09-30 Marzetta Thomas Louis Training for MIMO communication systems
KR100591890B1 (ko) * 2003-04-01 2006-06-20 한국전자통신연구원 다중 안테나 무선 통신 시스템에서의 적응 송수신 방법 및그 장치
US7099678B2 (en) * 2003-04-10 2006-08-29 Ipr Licensing, Inc. System and method for transmit weight computation for vector beamforming radio communication
TWI227975B (en) * 2003-04-24 2005-02-11 Benq Corp Communication system, signal pre-processing apparatus and signal receiving apparatus thereof
US7545867B1 (en) * 2003-05-14 2009-06-09 Marvell International, Ltd. Adaptive channel bandwidth selection for MIMO wireless systems
US7079870B2 (en) * 2003-06-09 2006-07-18 Ipr Licensing, Inc. Compensation techniques for group delay effects in transmit beamforming radio communication
US8391322B2 (en) * 2003-07-09 2013-03-05 Broadcom Corporation Method and system for single weight (SW) antenna system for spatial multiplexing (SM) MIMO system for WCDMA/HSDPA
JP4546177B2 (ja) 2003-07-28 2010-09-15 パナソニック株式会社 無線通信装置および無線通信方法
US7460494B2 (en) * 2003-08-08 2008-12-02 Intel Corporation Adaptive signaling in multiple antenna systems
US7864678B1 (en) 2003-08-12 2011-01-04 Marvell International Ltd. Rate adaptation in wireless systems
EP1508992A3 (en) * 2003-08-18 2008-05-21 Samsung Electronics Co., Ltd. Apparatus and method for scheduling resource in a multiuser MIMO radio communication system
US7415086B2 (en) * 2003-09-08 2008-08-19 Aktino, Inc. Multi-channel communication system for multiple input, multiple output processing of an encoded signal
US8908496B2 (en) * 2003-09-09 2014-12-09 Qualcomm Incorporated Incremental redundancy transmission in a MIMO communication system
WO2005027392A2 (en) * 2003-09-11 2005-03-24 The Kohl Group, Inc. Flexible transport system including support for bilateral user access
KR100713403B1 (ko) * 2003-09-30 2007-05-04 삼성전자주식회사 통신 시스템에서 채널 상태에 따른 송신 방식 제어 장치및 방법
US7706454B2 (en) * 2003-10-01 2010-04-27 Regents Of The University Of Minnesota Full-diversity, full-rate complex-field space-time coding for wireless communication
US7394780B1 (en) 2003-11-26 2008-07-01 Idirect Incorporated Method, apparatus, and system for downstream recovery in a communication network
US7257371B1 (en) 2003-11-26 2007-08-14 Idirect Incorporated Method, apparatus, and system for using a synchronous burst time plan in a communication network
US7215652B1 (en) 2003-11-26 2007-05-08 Idirect Incorporated Method, apparatus, and system for calculating and making a synchronous burst time plan in a communication network
US7359344B1 (en) 2003-11-26 2008-04-15 Idirect Incorporated Method, apparatus, and system for feathering data in a communication network
US7274908B1 (en) 2003-11-26 2007-09-25 Idirect Incorporated Method, apparatus, and system for demand assignment in a communication network
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
WO2005062498A1 (en) 2003-12-11 2005-07-07 Broadcom Corporation Spatial multiplexing in mimo systems
CN1918814B (zh) * 2003-12-11 2010-12-15 美国博通公司 多入多出系统中的空间复用
US7430430B2 (en) 2003-12-16 2008-09-30 Magnolia Broadband Inc. Adjusting a signal at a diversity system
US8204149B2 (en) 2003-12-17 2012-06-19 Qualcomm Incorporated Spatial spreading in a multi-antenna communication system
US7336746B2 (en) * 2004-12-09 2008-02-26 Qualcomm Incorporated Data transmission with spatial spreading in a MIMO communication system
US20050180312A1 (en) * 2004-02-18 2005-08-18 Walton J. R. Transmit diversity and spatial spreading for an OFDM-based multi-antenna communication system
US8169889B2 (en) * 2004-02-18 2012-05-01 Qualcomm Incorporated Transmit diversity and spatial spreading for an OFDM-based multi-antenna communication system
US7796696B2 (en) * 2004-02-19 2010-09-14 Broadcom Corporation Asymmetrical multiple stream wireless communication using STBC
US7697449B1 (en) 2004-07-20 2010-04-13 Marvell International Ltd. Adaptively determining a data rate of packetized information transmission over a wireless channel
US20050238111A1 (en) * 2004-04-09 2005-10-27 Wallace Mark S Spatial processing with steering matrices for pseudo-random transmit steering in a multi-antenna communication system
ATE372002T1 (de) * 2004-04-22 2007-09-15 France Telecom Übertragung zum cdma kommunikationssystem durch ein mimo kanal
US8285226B2 (en) * 2004-05-07 2012-10-09 Qualcomm Incorporated Steering diversity for an OFDM-based multi-antenna communication system
US8923785B2 (en) 2004-05-07 2014-12-30 Qualcomm Incorporated Continuous beamforming for a MIMO-OFDM system
JP4663369B2 (ja) * 2004-05-20 2011-04-06 パナソニック株式会社 無線通信システム、無線通信方法、基地局装置及び端末装置
US20050265280A1 (en) * 2004-05-25 2005-12-01 Samsung Electronics Co., Ltd. OFDM symbol transmission method and apparatus for providing sector diversity in a mobile communication system, and a system using the same
WO2005122426A1 (en) * 2004-06-14 2005-12-22 Samsung Electronics Co., Ltd. Apparatus and method for controlling transmission mode in a mimo mobile communication system
US20060002414A1 (en) * 2004-06-21 2006-01-05 Jianxuan Du Statistical data rate allocation for MIMO systems
KR100671231B1 (ko) * 2004-06-21 2007-02-28 삼성전자주식회사 최대 다이버시티 최대 부호율을 갖는 짝수개의 송신안테나를 위한 시공간 블록 부호 장치 및 방법
KR20050122665A (ko) * 2004-06-25 2005-12-29 삼성전자주식회사 다중 셀 구조를 갖는 이동통신 시스템에서 섹터다이버시티를 제공하는 직교 주파수 분할 다중 심벌 전송방법 및 송수신 장치
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
US7978649B2 (en) * 2004-07-15 2011-07-12 Qualcomm, Incorporated Unified MIMO transmission and reception
US7606319B2 (en) 2004-07-15 2009-10-20 Nokia Corporation Method and detector for a novel channel quality indicator for space-time encoded MIMO spread spectrum systems in frequency selective channels
TWI241790B (en) * 2004-07-16 2005-10-11 Ind Tech Res Inst Hybrid beamforming apparatus and method for the same
US7263335B2 (en) * 2004-07-19 2007-08-28 Purewave Networks, Inc. Multi-connection, non-simultaneous frequency diversity in radio communication systems
US7460839B2 (en) 2004-07-19 2008-12-02 Purewave Networks, Inc. Non-simultaneous frequency diversity in radio communication systems
US9148256B2 (en) 2004-07-21 2015-09-29 Qualcomm Incorporated Performance based rank prediction for MIMO design
US9137822B2 (en) 2004-07-21 2015-09-15 Qualcomm Incorporated Efficient signaling over access channel
US11381285B1 (en) 2004-08-02 2022-07-05 Genghiscomm Holdings, LLC Transmit pre-coding
US11184037B1 (en) 2004-08-02 2021-11-23 Genghiscomm Holdings, LLC Demodulating and decoding carrier interferometry signals
US11552737B1 (en) 2004-08-02 2023-01-10 Genghiscomm Holdings, LLC Cooperative MIMO
WO2006016485A1 (ja) * 2004-08-11 2006-02-16 Matsushita Electric Industrial Co., Ltd. 通信システム、基地局制御装置および基地局装置
US8270512B2 (en) * 2004-08-12 2012-09-18 Interdigital Technology Corporation Method and apparatus for subcarrier and antenna selection in MIMO-OFDM system
TWI455535B (zh) 2004-08-12 2014-10-01 Interdigital Tech Corp 正交分頻多工無線通信系統中實施空間頻率區塊編碼方法及裝置
CA2575701C (en) 2004-08-17 2012-04-10 Samsung Electronics Co., Ltd. Apparatus and method for space-time-frequency block coding using channel quality indicators (cqis)
US7561631B2 (en) * 2004-08-25 2009-07-14 Broadcom Corporation Multiple streams using partial STBC with SDM within a wireless local area network
US7978778B2 (en) 2004-09-03 2011-07-12 Qualcomm, Incorporated Receiver structures for spatial spreading with space-time or space-frequency transmit diversity
US7433434B2 (en) * 2004-10-01 2008-10-07 General Dynamics C4 Systems, Inc. Communication channel tracking apparatus
WO2006039812A1 (en) * 2004-10-15 2006-04-20 Nortel Networks Limited Communication resource allocation systems and methods
WO2006055719A2 (en) 2004-11-16 2006-05-26 The Board Of Regents, The University Of Texas System Precoding system and method for multi-user transmission in multiple antenna wireless systems
CN1780278A (zh) * 2004-11-19 2006-05-31 松下电器产业株式会社 子载波通信系统中自适应调制与编码方法和设备
US7573851B2 (en) * 2004-12-07 2009-08-11 Adaptix, Inc. Method and system for switching antenna and channel assignments in broadband wireless networks
US20060176971A1 (en) * 2005-02-07 2006-08-10 Nissani Nissensohn Daniel N Multi input multi output wireless communication reception method and apparatus
US7583763B2 (en) 2005-02-07 2009-09-01 Mimopro Ltd. Multi input multi output wireless communication reception method and apparatus
US9246560B2 (en) 2005-03-10 2016-01-26 Qualcomm Incorporated Systems and methods for beamforming and rate control in a multi-input multi-output communication systems
US9154211B2 (en) 2005-03-11 2015-10-06 Qualcomm Incorporated Systems and methods for beamforming feedback in multi antenna communication systems
US9520972B2 (en) 2005-03-17 2016-12-13 Qualcomm Incorporated Pilot signal transmission for an orthogonal frequency division wireless communication system
US9461859B2 (en) 2005-03-17 2016-10-04 Qualcomm Incorporated Pilot signal transmission for an orthogonal frequency division wireless communication system
US9143305B2 (en) 2005-03-17 2015-09-22 Qualcomm Incorporated Pilot signal transmission for an orthogonal frequency division wireless communication system
US9184870B2 (en) 2005-04-01 2015-11-10 Qualcomm Incorporated Systems and methods for control channel signaling
KR101049440B1 (ko) * 2005-04-13 2011-07-15 연세대학교 산학협력단 공간 분할 다중화 심볼 검출 장치 및 그 방법
US9036538B2 (en) 2005-04-19 2015-05-19 Qualcomm Incorporated Frequency hopping design for single carrier FDMA systems
US9408220B2 (en) 2005-04-19 2016-08-02 Qualcomm Incorporated Channel quality reporting for adaptive sectorization
US7466749B2 (en) 2005-05-12 2008-12-16 Qualcomm Incorporated Rate selection with margin sharing
US9130706B2 (en) * 2005-05-26 2015-09-08 Unwired Planet, Llc Method and apparatus for signal quality loss compensation in multiplexing transmission systems
US8879511B2 (en) 2005-10-27 2014-11-04 Qualcomm Incorporated Assignment acknowledgement for a wireless communication system
US8565194B2 (en) 2005-10-27 2013-10-22 Qualcomm Incorporated Puncturing signaling channel for a wireless communication system
US8462859B2 (en) 2005-06-01 2013-06-11 Qualcomm Incorporated Sphere decoding apparatus
US7428269B2 (en) * 2005-06-01 2008-09-23 Qualcomm Incorporated CQI and rank prediction for list sphere decoding and ML MIMO receivers
US8971461B2 (en) * 2005-06-01 2015-03-03 Qualcomm Incorporated CQI and rank prediction for list sphere decoding and ML MIMO receivers
US9179319B2 (en) 2005-06-16 2015-11-03 Qualcomm Incorporated Adaptive sectorization in cellular systems
US8358714B2 (en) * 2005-06-16 2013-01-22 Qualcomm Incorporated Coding and modulation for multiple data streams in a communication system
US7693037B2 (en) * 2005-06-21 2010-04-06 Qualcomm Incorporated Method and system for adapting an effective spreading sequence in a communication system using direct sequence spreading
US8885628B2 (en) 2005-08-08 2014-11-11 Qualcomm Incorporated Code division multiplexing in a single-carrier frequency division multiple access system
JP4708910B2 (ja) * 2005-08-09 2011-06-22 株式会社エヌ・ティ・ティ・ドコモ 移動通信システムの制御方法、制御装置、移動通信システム
US20070041457A1 (en) 2005-08-22 2007-02-22 Tamer Kadous Method and apparatus for providing antenna diversity in a wireless communication system
US9209956B2 (en) 2005-08-22 2015-12-08 Qualcomm Incorporated Segment sensitive scheduling
CN101248662B (zh) * 2005-08-24 2010-12-01 汤姆森特许公司 提供频道历史的方法和装置
US9136974B2 (en) 2005-08-30 2015-09-15 Qualcomm Incorporated Precoding and SDMA support
US9225416B2 (en) 2005-10-27 2015-12-29 Qualcomm Incorporated Varied signaling channels for a reverse link in a wireless communication system
US9172453B2 (en) 2005-10-27 2015-10-27 Qualcomm Incorporated Method and apparatus for pre-coding frequency division duplexing system
US8045512B2 (en) 2005-10-27 2011-10-25 Qualcomm Incorporated Scalable frequency band operation in wireless communication systems
US9088384B2 (en) 2005-10-27 2015-07-21 Qualcomm Incorporated Pilot symbol transmission in wireless communication systems
US9210651B2 (en) 2005-10-27 2015-12-08 Qualcomm Incorporated Method and apparatus for bootstraping information in a communication system
US8693405B2 (en) 2005-10-27 2014-04-08 Qualcomm Incorporated SDMA resource management
US9225488B2 (en) 2005-10-27 2015-12-29 Qualcomm Incorporated Shared signaling channel
US9144060B2 (en) 2005-10-27 2015-09-22 Qualcomm Incorporated Resource allocation for shared signaling channels
EP1943748A1 (en) 2005-10-28 2008-07-16 Koninklijke Philips Electronics N.V. Multiple antenna transmission with variable diversity gain
US7720437B2 (en) * 2005-12-08 2010-05-18 University Of South Florida Zero-order energy smart antenna and repeater
US7526321B2 (en) * 2005-12-08 2009-04-28 Accton Technology Corporation Wireless network apparatus and method of channel allocation for respective radios
US8064835B2 (en) * 2006-01-11 2011-11-22 Quantenna Communications, Inc. Antenna assignment system and method
JP4752523B2 (ja) * 2006-01-26 2011-08-17 ソニー株式会社 無線通信装置及び方法
US8543070B2 (en) 2006-04-24 2013-09-24 Qualcomm Incorporated Reduced complexity beam-steered MIMO OFDM system
TWI411255B (zh) * 2006-05-04 2013-10-01 Quantenna Communications Inc 多天線接收器系統及方法
US8091012B2 (en) * 2006-05-04 2012-01-03 Quantenna Communications Inc. System and method for decreasing decoder complexity
US8290089B2 (en) * 2006-05-22 2012-10-16 Qualcomm Incorporated Derivation and feedback of transmit steering matrix
US8514728B2 (en) * 2006-06-22 2013-08-20 Broadcom Corporation Methods and systems for estimating temporal correlation of a propagation channel
US8063839B2 (en) * 2006-10-17 2011-11-22 Quantenna Communications, Inc. Tunable antenna system
US20080101327A1 (en) * 2006-11-01 2008-05-01 Samsung Electronics Co., Ltd. Apparatus and method for space-time coding adaptive to number of antennas in multiple input multiple output wireless communication system
WO2008086414A2 (en) * 2007-01-09 2008-07-17 Viasat, Inc. Mimo satellite system
US8050707B2 (en) * 2007-02-02 2011-11-01 Dell Products L.P. Method for selecting a priority for wireless technologies via graphical representation
EP1993220B1 (en) * 2007-05-18 2010-08-11 Nokia Siemens Networks Oy Method for capacity evaluation in OFDM networks
CN101682359A (zh) * 2007-05-29 2010-03-24 夏普株式会社 无线接收装置、无线通信系统以及无线通信方法
KR100910020B1 (ko) 2007-05-30 2009-07-30 포스데이타 주식회사 Mimo 무선통신 시스템에서 stc 모드 결정 방법 및장치, 결정된 stc 모드의 응답 방법 및 장치
US20090022049A1 (en) * 2007-07-16 2009-01-22 Honeywell International Inc. Novel security enhancement structure for mimo wireless network
KR101454027B1 (ko) * 2007-08-10 2014-10-24 한국전자통신연구원 병렬 구조를 가지는 시분할 다중화 통신 시스템 및 방법
WO2009054938A1 (en) * 2007-10-19 2009-04-30 Quantenna Communications, Inc. Mitigating interference in a coded communication system
CN101471689B (zh) * 2007-12-29 2013-03-20 中国移动通信集团公司 在通信系统中传送数据的方法、通信装置及通信系统
US8275064B2 (en) * 2008-01-25 2012-09-25 Mint Access Fund, Llc Enhanced MIMO detection method and apparatus
US8958408B1 (en) 2008-06-05 2015-02-17 The Boeing Company Coded aperture scanning
US8509205B2 (en) * 2008-06-05 2013-08-13 The Boeing Company Multicode aperture transmitter/receiver
US8699424B2 (en) * 2008-06-27 2014-04-15 Microsoft Corporation Adapting channel width for improving the performance of wireless networks
US8411765B2 (en) 2008-10-10 2013-04-02 Ziva Corporation Techniques and systems for wireless communications
EP2214338B1 (en) * 2009-01-30 2014-01-15 Ntt Docomo, Inc. Apparatus and method for determining a channel quality parameter
IT1393478B1 (it) * 2009-04-02 2012-04-27 Siae Microelettronica Spa Sistema di protezione per ponti radio digitali a modulazione adattativa operanti in diversita'
US8811903B2 (en) * 2009-05-28 2014-08-19 Microsoft Corporation Spectrum assignment for networks over white spaces and other portions of the spectrum
US8565811B2 (en) * 2009-08-04 2013-10-22 Microsoft Corporation Software-defined radio using multi-core processor
US8743976B2 (en) 2009-09-03 2014-06-03 Ziva Corporation Techniques and systems for communications based on time reversal pre-coding
US9753884B2 (en) 2009-09-30 2017-09-05 Microsoft Technology Licensing, Llc Radio-control board for software-defined radio platform
US8627189B2 (en) 2009-12-03 2014-01-07 Microsoft Corporation High performance digital signal processing in software radios
FR2967543A1 (fr) * 2010-11-16 2012-05-18 France Telecom Procedes et dispositifs d'evaluation et d'adaptation de codage, procede et terminal de communication
KR101823188B1 (ko) 2011-05-04 2018-01-29 마이크로소프트 테크놀로지 라이센싱, 엘엘씨 기지국을 위한 스펙트럼 할당 기법
US8989286B2 (en) 2011-11-10 2015-03-24 Microsoft Corporation Mapping a transmission stream in a virtual baseband to a physical baseband with equalization
US9130711B2 (en) 2011-11-10 2015-09-08 Microsoft Technology Licensing, Llc Mapping signals from a virtual frequency band to physical frequency bands
GB2514174B (en) * 2013-05-17 2015-12-02 Cambium Networks Ltd Improvements to adaptive modulation
CN105050120B (zh) * 2015-08-18 2019-04-26 深圳市科虹通信有限公司 Lte网络的mimo性能诊断方法及系统
US9913278B2 (en) 2016-06-06 2018-03-06 Google Llc Systems and methods for dynamically allocating wireless service resources consonant with service demand density
EP3510701B1 (en) * 2016-10-11 2024-01-17 Telefonaktiebolaget LM Ericsson (publ) Methods and apparatuses for spatial pre-processing of signals in a wireless communication system
CA3057180C (en) 2017-03-22 2022-06-28 Huawei Technologies Co., Ltd. Method and apparatus for sending virtual reality image
US10243773B1 (en) 2017-06-30 2019-03-26 Genghiscomm Holdings, LLC Efficient peak-to-average-power reduction for OFDM and MIMO-OFDM
US10637705B1 (en) 2017-05-25 2020-04-28 Genghiscomm Holdings, LLC Peak-to-average-power reduction for OFDM multiple access
US10714050B2 (en) * 2018-03-21 2020-07-14 Daqri, Llc Reducing latency in augmented reality (AR) displays
EP3915236A4 (en) 2019-01-25 2023-05-24 Genghiscomm Holdings, LLC ORTHOGONAL MULTI-ACCESS AND NON-ORTHOGONAL MULTI-ACCESS
US11917604B2 (en) 2019-01-25 2024-02-27 Tybalt, Llc Orthogonal multiple access and non-orthogonal multiple access
US11343823B2 (en) 2020-08-16 2022-05-24 Tybalt, Llc Orthogonal multiple access and non-orthogonal multiple access
WO2020242898A1 (en) 2019-05-26 2020-12-03 Genghiscomm Holdings, LLC Non-orthogonal multiple access
WO2021038661A1 (ja) * 2019-08-23 2021-03-04 日本電信電話株式会社 光伝送システム
CN111800783B (zh) * 2020-05-22 2021-04-30 中南民族大学 通信波形参数捷变的安全无线通信方法、设备及存储设备
EP4184813A4 (en) * 2020-07-14 2023-08-23 Beijing Xiaomi Mobile Software Co., Ltd. INFORMATION TRANSMISSION METHOD AND APPARATUS, COMMUNICATION DEVICE AND STORAGE MEDIA

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5592490A (en) * 1991-12-12 1997-01-07 Arraycomm, Inc. Spectrally efficient high capacity wireless communication systems
US5515378A (en) * 1991-12-12 1996-05-07 Arraycomm, Inc. Spatial division multiple access wireless communication systems
US5828658A (en) * 1991-12-12 1998-10-27 Arraycomm, Inc. Spectrally efficient high capacity wireless communication systems with spatio-temporal processing
US6018528A (en) 1994-04-28 2000-01-25 At&T Corp System and method for optimizing spectral efficiency using time-frequency-code slicing
US5815488A (en) 1995-09-28 1998-09-29 Cable Television Laboratories, Inc. Multiple user access method using OFDM
US6097771A (en) 1996-07-01 2000-08-01 Lucent Technologies Inc. Wireless communications system having a layered space-time architecture employing multi-element antennas
AU4238697A (en) 1996-08-29 1998-03-19 Cisco Technology, Inc. Spatio-temporal processing for communication
US5933421A (en) 1997-02-06 1999-08-03 At&T Wireless Services Inc. Method for frequency division duplex communications
US6175550B1 (en) 1997-04-01 2001-01-16 Lucent Technologies, Inc. Orthogonal frequency division multiplexing system with dynamically scalable operating parameters and method thereof
US6108565A (en) * 1997-09-15 2000-08-22 Adaptive Telecom, Inc. Practical space-time radio method for CDMA communication capacity enhancement
US6058105A (en) * 1997-09-26 2000-05-02 Lucent Technologies Inc. Multiple antenna communication system and method thereof
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
US6067290A (en) * 1999-07-30 2000-05-23 Gigabit Wireless, Inc. Spatial multiplexing in a cellular network

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1886916B (zh) * 2003-12-04 2012-06-27 巴比禄股份有限公司 无线lan发送接收装置、无线lan发送接收方法
CN102684769A (zh) * 2003-12-04 2012-09-19 巴比禄股份有限公司 无线lan发送接收装置、无线lan发送接收方法
CN106851851A (zh) * 2003-12-23 2017-06-13 英特尔公司 使用空分多址(sdma)同时和多个移动站通信的无线访问点
CN106851851B (zh) * 2003-12-23 2021-07-06 苹果公司 使用空分多址(sdma)同时和多个移动站通信的无线访问点
CN1645846B (zh) * 2003-12-24 2010-09-29 三星电子株式会社 正交频分复用通信系统中的数据发送装置及方法
CN101719779B (zh) * 2004-06-23 2013-06-26 三星电子株式会社 在无线通信系统中使用多个天线接收分组数据的设备和方法
US9178580B2 (en) 2005-04-07 2015-11-03 Interdigital Technology Corporation Method and apparatus for antenna mapping selection in MIMO-OFDM wireless networks
CN100592672C (zh) * 2005-11-30 2010-02-24 上海贝尔阿尔卡特股份有限公司 空时编码/译码模式的动态切换方法及装置
CN101374136B (zh) * 2007-08-17 2015-05-20 英特尔移动通信有限责任公司 发送和接收通信信号的方法及发送和接收通信信号的装置
CN112018526A (zh) * 2020-07-18 2020-12-01 中国人民解放军战略支援部队信息工程大学 基于空时异构天线阵列的信号接收方法
CN112018526B (zh) * 2020-07-18 2023-04-07 中国人民解放军战略支援部队信息工程大学 基于空时异构天线阵列的信号接收方法

Also Published As

Publication number Publication date
DE60023032D1 (de) 2006-02-16
US6351499B1 (en) 2002-02-26
DE60023032T2 (de) 2006-07-20
EP1240730B1 (en) 2005-10-05
AU2061501A (en) 2001-06-25
EP1628414A3 (en) 2006-04-26
EP1240730A4 (en) 2003-05-28
EP1628414A2 (en) 2006-02-22
BR0016772A (pt) 2002-12-10
WO2001045300A1 (en) 2001-06-21
USRE44959E1 (en) 2014-06-24
EP1240730A1 (en) 2002-09-18
MXPA02006019A (es) 2004-08-23
CN1207852C (zh) 2005-06-22

Similar Documents

Publication Publication Date Title
CN1207852C (zh) 使用多个天线和自适应控制最大化通信参数的方法和无线系统
CN101385299B (zh) 用于在多输入多输出系统中基于用户确定的等级来调度用户的方法和系统
CN100340077C (zh) 多天线无线传输系统中信道环境自适应传输方法
US6760882B1 (en) Mode selection for data transmission in wireless communication channels based on statistical parameters
CN101636952B (zh) 用于基于频率选择性来选择调制和编码方案(mcs)指标的方法和装置
CN100438370C (zh) 多个传输模式的多输入、多输出(mimo)系统
JP4173137B2 (ja) データ伝送レートのランクアダプティブな適合化を有するmimo信号処理方法
CN1829138A (zh) 自适应多输入多输出发送接收系统及其方法
CN1650541A (zh) 使用多发射多接收天线阵列的无线通信
CN1841987A (zh) 无线通信装置和无线通信方法
CN1957546A (zh) 具有量化的波束形成反馈的多输入多输出多载波通信系统及方法
CN1862999A (zh) 在多天线移动通信系统中用于分配用户的装置和方法
CN1894864A (zh) 多载波无线通信系统中的自适应比特加载和功率分配
CN1819573A (zh) 用于使用ofdm的无线分组数据通信系统的分布式多天线调度
CN1647436A (zh) 动态地优化无线发射信息的发射模式的系统和方法
CN1309184C (zh) 无线电接收机、无线电发射机以及阻抗控制方法
CN1941660A (zh) 多天线无线通信系统中的多用户分集方法及系统
WO2007121568A1 (en) Method and system for closed loop multiple input/output antenna environments in wireless communication
CN101039163A (zh) 相关多输入多输出系统中自适应波束选取和传输方法及系统
CN1663167A (zh) 一种偏置接收信号数据段的定时相位估计的方法和系统
JP4542156B2 (ja) 伝播状況に応じての信号変調の多様な解像度レベルを伴う無線通信の方法およびシステム
CN1820441A (zh) 多天线通信系统内通过射频信号合并和自适应位加载实现数据率最大化的系统和方法
CN1921334A (zh) 基于误符号率的空时分组码下行发送功率分配方法
CN104767557A (zh) 基于信道质量的自适应波束加权信息分组反馈方法及装置
Wei et al. Tackling MIMO-OFDMA feedback load through feedback encoding

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C14 Grant of patent or utility model
GR01 Patent grant
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20050622

Termination date: 20171205

CF01 Termination of patent right due to non-payment of annual fee