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    • 2. 发明专利
    • BR0012870A
    • 2002-04-16
    • BR0012870
    • 2000-07-24
    • ARI HOTTINENMARKO TEITTINENOGUZ SUNAY M
    • HOTTINEN ARITEITTINEN MARKOSUNAY M OGUZ
    • H04J1/00H04J3/00H04W36/14H04W36/18H04Q7/38
    • A system and method for controlling information transmission and communication handoff between frequency division multiplexing (FDD) and time division multiplexing (TDD) communication systems using any multiple access scheme is provided. The mobile unit transmits information via a current one of the FDD and TDD communication systems while it moves toward the other, or targeted one of the FDD and TDD communication systems. A pilot search signal is generated by the targeted communication system, where the pilot search signal corresponds to a transmission range of the targeted communication system. A communication handoff is initiated from the current communication system to the targeted communication system when the mobile unit recognizes a predetermined threshold level of the pilot search signal. Concurrent communications are synchronized and temporarily maintained between the mobile unit and both the current and targeted communications systems using an increased data rate for each of the communications links. When the handoff is complete, transmission between the mobile unit and the current communication system is terminated, while communication between the mobile unit and the targeted communication system is maintained when the handoff is complete.
    • 9. 发明申请
    • APPARATUS, METHOD AND COMPUTER PROGRAM PRODUCT FOR DETERMINING TRANSMIT WEIGHTS IN RELAY NETWORKS
    • 用于确定中继网络中的发射权重的装置,方法和计算机程序产品
    • WO2009069067A3
    • 2009-09-03
    • PCT/IB2008054928
    • 2008-11-24
    • NOKIA CORPNOKIA INCHOTTINEN ARIFERTL PETER
    • HOTTINEN ARIFERTL PETER
    • H04B7/06
    • H04B7/0617H04B7/0619H04B7/15528
    • Apparatus, methods and computer program products implement a channel-aware approach for controlling a relay network operative in a wireless communications system wherein weighting matrices are used at a MIMO-capable source electronic device and at the relays where at least one of the weighting matrices is selected or derived using knowledge of channel components of at least one channel link, where the channel link may be from the relays to the destination antennas of the destination device; or from source antennas of the MIMO-capable source device to the relays, or from the source antennas of the MIMO-capable source device to the destination antennas of the destination device, hi one approach weighting matrices applied at the source and relay nodes are selected from a predetermined codebook of weighting matrices in dependence on monitored channel conditions. Alternatively, the weighting matrices may be determined using an eigenvalue decomposition and power allocation (e.g., water-filling) approach by using the effective channel correlation matrix possibly combined with the use of the noise correlation matrix.
    • 设备,方法和计算机程序产品实现用于控制在无线通信系统中操作的中继网络的信道感知方法,其中加权矩阵在具有MIMO功能的源电子设备处使用,并且在加权矩阵中的至少一个是 使用至少一个信道链路的信道分量的知识来选择或导出,其中信道链路可以是从中继站到目的地设备的目的地天线; 或从具有MIMO功能的源设备的源天线到中继站,或者从具有MIMO功能的源设备的源天线到目的地设备的目的地天线。在一种方法中,选择在源和中继节点处应用的加权矩阵 根据监测的信道条件从预先确定的权重矩阵码本中选择。 或者,可以使用特征值分解和功率分配(例如,注水)方法,通过使用可能与噪声相关矩阵的使用相结合的有效信道相关矩阵来确定加权矩阵。