发明名称 |
METHODS AND SYSTEMS FOR PROGRAMMABLE DIGITAL UP-CONVERSION |
摘要 |
Methods and apparatus are described herein that make use of complex tuning, the inherently repetitive nature of sampled signals, and programmable digital filtering to create a flexible digital up-conversion system that utilizes a digital-to-analog converter (DAC) with a fixed effective sample rate while still being adapted for tunability over a wide frequency range. With a knowledge of the fixed effective sample rate of the DAC and a desired frequency of up-conversion and combining complex tuning at baseband and up-sampling by a factor of N with a programmable passband filter configured to select one of a plurality of signal images resulting from the up-sampling, it is possible to translate a baseband input signal to a wide range of frequencies above or below Fs, without changing the sampling rate of the fixed rate DAC used in the up-conversion process.
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申请公布号 |
CA2743263(A1) |
申请公布日期 |
2010.04.29 |
申请号 |
CA20092743263 |
申请日期 |
2009.10.20 |
申请人 |
NORTEL NETWORKS LIMITED |
发明人 |
FULLER, ARTHUR THOMAS GERALD;MORRIS, BRADLEY JOHN |
分类号 |
H04L27/00;H03H17/02;H03M1/66 |
主分类号 |
H04L27/00 |
代理机构 |
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