| 发明名称 | Method and apparatus for demodulation of a desired signal by constellation-independent cancellation of nonlinear-distorted interference | ||
| 摘要 | A method and apparatus are provided for demodulating a received signal containing modulated desired-signal digital data and relayed-interference that results from a nonlinear-distorted interference signal. Estimation of the nonlinear-distorted interference from a pre-distortion interference signal and subsequent cancellation within the received signal of the distorted interference produces a residual-interference signal that is subsequently demodulated to produce estimates of the desired-signal data. The estimation is adapted for changing nonlinear distortion effects. | ||
| 申请公布号 | US9608718(B2) | 申请公布日期 | 2017.03.28 |
| 申请号 | US201615166879 | 申请日期 | 2016.05.27 |
| 申请人 | PM Associates ;Datum Systems Inc. | 发明人 | Monsen Peter;Cannon Richard Hollingsworth |
| 分类号 | H04B1/18;H04B1/10;H04B7/185;H04B7/06;H04J11/00;H04J3/16;H04B1/7093 | 主分类号 | H04B1/18 |
| 代理机构 | Mintz Levin Cohn Ferris Glovsky and Popeo, P.C. | 代理人 | Mintz Levin Cohn Ferris Glovsky and Popeo, P.C. ;Jensen Steven M.;Emmons Richard B. |
| 主权项 | 1. A receiving apparatus for use in a satellite ground terminal that generates in a source-transmitter a digital-data source signal that is modulated to a modulated-source signal and subsequently, filtered and converted to a bandpass signal and distorted in a nonlinear power amplifier to produce a bandpass distorted-interference signal, the receiving apparatus comprising: a receiver filter/sampler with a receiver-timing clock for filtering, with a matched filter, a received signal containing a bandpass desired signal, which has a modulation period of TD seconds, is filtered with a waveform filter, and is derived from desired-signal digital-data and the delayed bandpass distorted-interference signal to produce a period-TR, TR<TD, discrete-time receiver signal, wherein the matched filter has a complex conjugate, time-inverted impulse response of the waveform filter, wherein TD and TR are nonzero real numbers less than unity; a synchronizer/sampler for sampling at a rate of 1/TR the modulated-source signal and comparing the sampled modulated-source signal with the period-TR discrete-time receiver signal to produce a transmission time delay that is applied to the sampled modulated-source signal to produce a synchronized-interference signal; a vector power series generator that produces a power vector with components that depend on the magnitude of the synchronized-interference signal; a source multiplier that multiplies the synchronized-interference signal and the power vector to produce an interference vector; a matched filter that filters the interference vector with the waveform filter to produce a matched-interference vector; a weight generator that produces a vector of distortion weights that depend on the matched-interference vector; a vector processor that produces from the vector of distortion weights a distorted-interference signal that depends on the interference vector; a combiner that sums the distorted-interference signal and the discrete-time receiver signal to produce a residual-interference signal; and a desired-signal demodulator for demodulating the residual-interference signal to produce estimates of the desired-signal digital-data. | ||
| 地址 | Stowe VT US | ||