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    • 16. 发明授权
    • Measuring noise power at wireless receivers using pilot symbol information
    • 使用导频符号信息测量无线接收机的噪声功率
    • US08223826B2
    • 2012-07-17
    • US12944587
    • 2010-11-11
    • Djordje TujkovicYing XiaRobert LorenzSriram Mudulodu
    • Djordje TujkovicYing XiaRobert LorenzSriram Mudulodu
    • H04B3/46H04B17/00H04Q1/20
    • H04B17/345H04B17/26H04B2201/70701H04L25/0224H04L2025/03414H04L2025/03426
    • Embodiments are directed to a wireless receiver system that utilizes a special structure of pilot symbols used for synchronization and channel estimation in transmission packets to measure noise power at the receiver. The periodicity of the pilot signal sequences is used to extract the noise power from the received signal. Such extraction is achieved by subtracting the received signals from two pilot slots which are separated by the known periodicity of the training sequence. This method relies on the fact that desired signal and system interference signals will cancel out after the subtraction process. Measuring the power of the residual signal after subtraction represents the estimate of the noise power. Several consecutive such residual signals can be first summed up before measuring the power to improve the estimate of the noise power at the receiver. To further improve the performance, estimates of the desired signal produced by a channel estimation block can be first subtracted from each of the received signals on two pilot slots which are then to be subtracted and are separated by the known periodicity of the pilot sequence.
    • 实施例涉及一种无线接收机系统,其利用用于传输分组中的同步和信道估计的导频符号的特殊结构来测量接收机处的噪声功率。 导频信号序列的周期性用于从接收信号中提取噪声功率。 通过从由训练序列的已知周期分隔的两个导频时隙中减去接收到的信号来实现这种提取。 该方法依赖于在减法处理之后所期望的信号和系统干扰信号将被抵消的事实。 减去后测量残留信号的功率表示噪声功率的估计。 在测量功率之前可以首先总结几个连续的这样的残余信号,以改善接收机噪声功率的估计。 为了进一步提高性能,可以首先从两个导频时隙上的每个接收信号中减去由信道估计块产生的期望信号的估计值,然后被减去并且被导频序列的已知周期分隔。