首页>
外国专利>
Robust carrier phase and frequency tracking for M-QAM demodulation
Robust carrier phase and frequency tracking for M-QAM demodulation
展开▼
机译:M-QAM解调的强大载波相位和频率跟踪
展开▼
页面导航
摘要
著录项
相似文献
摘要
A method for determining coarse carrier phase and frequency offsets of an initial block of received M-QAM symbols includes creating a grid of discrete candidate phase offset values and for each candidate value: applying the candidate value to each symbol, applying a respective hard decision to each applied symbol, and computing a figure of merit based thereon. The candidate value having the best figure of merit is selected as an initial phase offset estimate. An initial frequency offset estimate is computed using the symbols updated with the initial phase offset estimate, their respective hard decisions, and an approximation of the complex exponential function. To track carrier phase and frequency offsets associated with a series of symbol blocks, for each symbol of a current block, set a binary trust weight based on comparison of a computed parameter with a threshold and use the binary trust weights to compute a phase offset error and a frequency offset error for the current block.
展开▼