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    • 26. 发明申请
    • SYSTEM AND METHOD FOR CALIBRATION OF SERIAL LINKS USING A SERIAL-TO-PARALLEL LOOPBACK
    • 使用串行到并行循环校准串行链路的系统和方法
    • US20130151796A1
    • 2013-06-13
    • US13316386
    • 2011-12-09
    • Alok Gupta
    • Alok Gupta
    • G06F12/00G06F13/12
    • G06F13/12G06F12/12G06F13/4234G11C2029/3602
    • A system and method for calibration of serial links using serial-to-parallel loopback. Embodiments of the present invention are operable for calibrating serial links using parallel links thereby reducing the number of links that need calibration. The method includes sending serialized data over a serial interface and receiving parallel data via a parallel interface. The serialized data is looped back via the parallel interface. The method further includes comparing the parallel data and the serialized data for a match thereof and calibrating the serial interface by adjusting the sending of the serialized data until the comparing detects the match. The adjusting of the sending is operable to calibrate the sending of the serialized data over the serial interface.
    • 一种使用串行到并行环回校准串行链路的系统和方法。 本发明的实施例可用于使用并行链路校准串行链路,从而减少需要校准的链路的数量。 该方法包括通过串行接口发送串行数据,并通过并行接口接收并行数据。 序列化数据通过并行接口环回。 该方法还包括比较并行数据和串行数据以进行匹配,并通过调整串行化数据的发送来校准串行接口,直到比较检测到匹配为止。 发送的调整可以通过串行接口校准串行化数据的发送。
    • 29. 发明申请
    • Automatic frequency control for a wireless communication system with multiple subcarriers
    • 具有多个子载波的无线通信系统的自动频率控制
    • US20060215778A1
    • 2006-09-28
    • US11372931
    • 2006-03-09
    • Vinay MurthyAlok GuptaSeong Taek ChungFuyun Ling
    • Vinay MurthyAlok GuptaSeong Taek ChungFuyun Ling
    • H04K1/10
    • G06F1/0353H04L5/0007H04L5/0048H04L27/2659H04L27/266H04L27/2662H04L27/2675H04L27/2678
    • Techniques for performing frequency control in an OFDM system are described. In one aspect, frequency acquisition is performed based on a received pilot, and frequency tracking is performed based on received OFDM symbols. For frequency acquisition, an initial frequency error estimate may be derived based on the received pilot, and an automatic frequency control (AFC) loop may be initialized with the initial frequency error estimate. For frequency tracking, a frequency error estimate may be derived for each received OFDM symbol, and the AFC loop may be updated with the frequency error estimate. Frequency error in input samples is corrected by the AFC loop with the initial frequency error estimate as well as the frequency error estimate for each received OFDM symbol. In another aspect, a variable number of samples of a received OFDM symbol are selected, e.g., based on the received OFDM symbol timing, for use for frequency error estimation.
    • 描述在OFDM系统中执行频率控制的技术。 在一个方面,基于接收到的导频执行频率采集,并且基于接收的OFDM符号执行频率跟踪。 对于频率获取,可以基于接收到的导频来导出初始频率误差估计,并且可以利用初始频率误差估计来初始化自动频率控制(AFC)循环。 对于频率跟踪,可以针对每个接收的OFDM符号导出频率误差估计,并且可以用频率误差估计来更新AFC循环。 通过具有初始频率误差估计的AFC回路以及每个接收的OFDM符号的频率误差估计来校正输入采样中的频率误差。 在另一方面,例如基于所接收的OFDM符号定时,选择接收到的OFDM符号的可变数目的样本,以用于频率误差估计。