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    • 3. 发明授权
    • Transmit power adaptation for CDMA communication systems using successive interference cancellation
    • 使用连续干扰消除的CDMA通信系统的发射功率适配
    • US07408975B2
    • 2008-08-05
    • US11076751
    • 2005-03-10
    • Yeheskel Bar-NessYe Hoon Lee
    • Yeheskel Bar-NessYe Hoon Lee
    • H04B1/00
    • H04B1/71072H04B2201/70706H04W52/16H04W52/248
    • Transmit power adaptation for DS/CDMA systems is disclosed for a CDMA system that utilizes a successive interference cancellation receiver on fading channels. The transmission power is adapted in response to channel variations to achieve an arbitrary power profile for received signal powers at the system base station. That is, the received signal powers are distributed with some factor xi's given as: SRi=SR(1)xi, (i=2, 3, . . . , K and x1=1) where K is the number of users and SR(i) is the received signal power of the user having the ith strength, and wherein user strengths are ranked in the order of estimated channel gains. The factor xi gives a measure of the disparity between the received power levels. The channel is estimated at both the transmitter and receiver. In one embodiment, the factors, xi, for distributing the signal powers are selected such that the average BER for each user is minimized. In another embodiment, the factors, xi, for distributing the signal powers are selected such that, after successive interference cancellation, an instantaneous BER for all users is equal.
    • 对于在衰落信道上利用连续干扰消除接收机的CDMA系统,公开了用于DS / CDMA系统的发射功率适配。 传输功率是响应于信道变化而适应的,以实现系统基站处的接收信号功率的任意功率分布。 也就是说,接收的信号功率以给定的一些因子x分配:<?in-line-formula description =“In-line Formulas”end =“lead”?> S < (1)其中(i = 2,...,n) 3,...,K和x 1 = 1)<?in-line-formula description =“In-line Formulas”end =“tail”?>其中K是用户数, (i)是具有第i个强度的用户的接收信号功率,并且其中用户强度按照 估计渠道收益。 因子x i i给出了接收功率电平之间的差异的度量。 在发射机和接收机两者估计信道。 在一个实施例中,选择用于分配信号功率的因子,使得每个用户的平均BER被最小化。 在另一个实施例中,选择用于分配信号功率的因子,使得在连续干扰消除之后,所有用户的瞬时BER相等。
    • 4. 发明授权
    • Method and apparatus for determining antenna weight in a closed-loop transmit diversity system
    • 用于确定闭环发射分集系统中的天线权重的方法和装置
    • US07391817B2
    • 2008-06-24
    • US10858617
    • 2004-06-02
    • Ye-Hoon Lee
    • Ye-Hoon Lee
    • H04L1/02
    • H04B7/0634
    • A method and apparatus for adaptively determining weights for transmission antennas according to a channel condition in a closed-loop transmit diversity system using a plurality of transmission antennas. The antenna weights are determined using variation of channel characteristics based on time and space, to thereby improve bit error rate performance. Parameters for fixing average transmission power per symbol according to the statistical channel characteristics for symbol energy and additive white Gaussian nose energy are previously determined to estimate channel characteristics. The antenna weights are determined using the parameters and channel gains estimated upon reception of data symbols.
    • 一种用于根据使用多个发送天线的闭环发射分集系统中的信道条件自适应地确定发射天线的权重的方法和装置。 使用基于时间和空间的信道特性的变化确定天线权重,从而提高误码率性能。 预先确定根据符号能量和加性白高斯鼻能的统计通道特性固定每符号的平均发射功率的参数,以估计信道特性。 使用在接收数据符号时估计的参数和信道增益来确定天线权重。
    • 9. 发明授权
    • Signal reception apparatus and method for multi-band ultra-wideband communication systems
    • 用于多频带超宽带通信系统的信号接收装置和方法
    • US07369829B2
    • 2008-05-06
    • US10915452
    • 2004-08-11
    • Ye-hoon LeeSeung-young ParkYong-suk KimWan-jin KimWoo-kyung Lee
    • Ye-hoon LeeSeung-young ParkYong-suk KimWan-jin KimWoo-kyung Lee
    • H04B7/00H04B1/06
    • H04B1/71637
    • A signal reception apparatus and method for communication systems. The signal reception apparatus for communication systems according to the present invention is applicable to communication environments in which a plurality of sub-bands having different frequency bands are sequentially used for communications. An embodiment of the invention has a multi-band index generation unit, a multi-band frequency generation unit, a multiplication unit, a correlation signal reception unit, and a buffer unit. The multi-band index generation unit generates a multi-band index corresponding to a sub-band to which a received signal is transmitted in correspondence with the multi-band index. The multiplication unit outputs a signal obtained by multiplying the received signal by the multi-band frequency. The correlation signal reception unit integrates and outputs the signal of the multiplication unit based on an integral time set in correspondence with the multi-band index. Further, the buffer unit buffers the signal of the correlation signal reception unit to be outputted at a predetermined data rate.
    • 一种用于通信系统的信号接收装置和方法。 根据本发明的用于通信系统的信号接收装置可应用于其中具有不同频带的多个子带被顺序地用于通信的通信环境。 本发明的实施例具有多频带索引生成单元,多频带频率生成单元,乘法单元,相关信号接收单元和缓冲单元。 多频带索引生成单元根据多频带索引生成与发送接收信号的子带对应的多频带索引。 乘法单元输出通过将接收信号乘以多频带频率而获得的信号。 相关信号接收单元基于与多频带索引相对应地设定的积分时间积分并输出乘法单元的信号。 此外,缓冲器缓冲以预定数据速率输出的相关信号接收单元的信号。