摘要:
In a method for processing a signal received by a receiver, at a first wireless receiver (20, 62) a first signal (x(t), x1(t)) comprising first and second signal components is received. The first signal component is intended for the first wireless receiver (20, 62) and the second signal component is related to at least one of a sending signal (s(t)) generated by a transmitter (29, 69) or to a second signal (x2(t)) intended for a second wireless receiver (61). To the first wireless receiver (20, 62) a reference signal (r(t), r1(t), r2(t)) which is proportional to the sending signal (s(t)) or to the second signal (x2(t)). At the first wireless receiver (20, 62) and from the reference signal (r(t), r1(t), r2(t)) an estimation signal which estimates the second signal component is generated. A filtered signal (y(t), y1(t)) is generated by subtracting the estimation signal from the first signal (x(t), x1(t)).
摘要:
In a method for processing a signal received by a receiver, at a first wireless receiver (20, 62) a first signal (x(t), x1(t)) comprising first and second signal components is received. The first signal component is intended for the first wireless receiver (20, 62) and the second signal component is related to at least one of a sending signal (s(t)) generated by a transmitter (29, 69) or to a second signal (x2(t)) intended for a second wireless receiver (61). To the first wireless receiver (20, 62) a reference signal (r(t), r1(t), r2(t)) which is proportional to the sending signal (s(t)) or to the second signal (x2(t)). At the first wireless receiver (20, 62) and from the reference signal (r(t), r1(t), r2(t)) an estimation signal which estimates the second signal component is generated. A filtered signal (y(t), y1(t)) is generated by subtracting the estimation signal from the first signal (x(t), x1(t)).
摘要:
A continuous-time sigma-delta analog-to-digital converter (CV) comprises i) a signal path (SP) comprising at least one combiner (C1) for combining analog signals to convert with feedback analog signals, at least two integrators (H1, H5), mounted in series, to integrate the combined analog signals, a quantizer (Q) for converting the integrated signals into digital signals, and a decimation filter (DF) for filtering digital signals, and ii) a feedback path (FP) comprising at least a digital-to-analog converter (DAC) for converting the digital signals output by the quantizer (Q) into feedback analog signals intended for the combiner (C1). Each integrator (H1, H5) comprises variable capacitance means arranged to be set in chosen states define by the values of a digital word, to present chosen capacitances. The converter (CV) also comprises a self-calibration control means (CCM) arranged a) to generate a digital word with a chosen first value, b) to estimate an in-band noise IBN(n) from the filtered digital signals and to compare this IBN(n) to the preceding IBN(n-1), c) to modify the digital word value to decrease the capacitance of each integrator from a chosen decrement when IBN(n) is smaller than IBN(n-1), d) to iterate steps b) and c) till IBN(n) be greater than IBN(n-1), and to choose as calibration digital word value the value corresponding to IBN(n-1) to set the calibration state of the variable capacitance means.
摘要:
A method of operating a multi-stream reception scheme, such as DOCSIS (Data Over Cable Service Interface Specifications), comprising at least two receivers (10, 12, 14) having respective voltage controlled oscillators (16), the method including monitoring a change in local oscillator frequency in a selected one of the at least two streams and, if the frequency distance between the local oscillator frequencies is below a value likely to cause pulling or coupling between the voltage controlled oscillators of the at least two receivers, resetting the frequency planning of the selected one of the at least two streams to maximize the frequency distance of the voltage controlled oscillator of the selected stream with the voltage controlled oscillators of the or the other streams.
摘要翻译:一种操作诸如DOCSIS(Data Over Cable Service Interface Specifications)的多流接收方案的方法,包括至少两个具有各自的压控振荡器(16)的接收器(10,12,14),该方法包括监视变化 在所述至少两个流中所选择的一个中的本地振荡器频率中,并且如果所述本地振荡器频率之间的频率距离低于可能导致所述至少两个接收机的压控振荡器之间的拉或耦合的值,则重置所述频率 规划所述至少两个流中所选择的一个流,以使所选择的流的压控振荡器的频率距离与所述或其它流的压控振荡器最大化。
摘要:
In a first aspect, the invention provides to a device comprising a substrate and an electrical conductor arranged between two terminals (A, B) and shaped for forming an inductor comprising at least two loops (1, 2) and arranged such that, at least locally, the far field is reduced. This arrangement results in an inductor which radiates a smaller magnetic field, also referred to as reduced EMI, which results in less noise generated in other inductive parts of an electronic circuit or system. The invention further provides in an advantageous embodiment proper balancing of the parasitic resistance and capacitance. By doing so the physical mid-point of 8-shaped inductors becomes the electrical mid-point (MP) which is beneficial when the inductor is used in a circuit. In a second aspect the invention provides an electronic system comprising the device according to the invention, wherein the electronic system comprises an LC-based voltage-controlled oscillator comprising the inductor, the electronic system being one of a group comprising: a multi-channel TV-receiver, a full-duplex transceiver, and a co-banding system. All these systems benefit from the symmetrical properties of the inductor. The better far-field compensation leads to a smaller VCO pulling effect which leads to a better performance of the system.
摘要:
A method of operating a multi-stream reception scheme, such as DOCSIS (Data Over Cable Service Interface Specifications), comprising at least two receivers (10, 12, 14) having respective voltage controlled oscillators (16), the method including monitoring a change in local oscillator frequency in a selected one of the at least two streams and, if the frequency distance between the local oscillator frequencies is below a value likely to cause pulling or coupling between the voltage controlled oscillators of the at least two receivers, resetting the frequency planning of the selected one of the at least two streams to maximise the frequency distance of the voltage controlled oscillator of the selected stream with the voltage controlled oscillators of the or the other streams.
摘要翻译:一种操作诸如DOCSIS(Data Over Cable Service Interface Specifications)的多流接收方案的方法,包括至少两个具有各自的压控振荡器(16)的接收器(10,12,14),该方法包括监视变化 在所述至少两个流中所选择的一个中的本地振荡器频率中,并且如果所述本地振荡器频率之间的频率距离低于可能导致所述至少两个接收机的压控振荡器之间的拉或耦合的值,则重置所述频率 规划所述至少两个流中所选择的一个流,以使所选择的流的压控振荡器的频率距离与所述或其它流的压控振荡器最大化。
摘要:
A system and method provide adaptive filtering of radio frequency (RF) signals. Multiple signals are received in a predetermined RF spectrum, the signals including a desired signal and multiple potentially interfering signals. A first signal of the potentially interfering signals is down-converted to a baseband signal, and a power of the baseband signal is determined. When the power exceeds a predetermined threshold power, a first notch filter, corresponding to a frequency of the first signal, is activated.
摘要:
An analog-to-digital converter (ADC1) of the Sigma Delta type provides a stream of digital output samples (OUT) in response to an analog input signal (IN). The analog-to-digital converter (ADC1) comprises a quantizer (QNT) that has a dead zone. The quantizer (QNT) provides a digital output sample that has a neutral value when the quantizer (QNT) receives an input signal whose amplitude is within the dead zone. A feedback path (DAC) within the analog-to-digital converter (ADC1) provides a feedback action only in response to a digital output sample that has a value other than the neutral value.
摘要:
The present invention relates to a receiver apparatus, analog-to-digital converter apparatus, and method of converting an analog input signal into a digital output signal, wherein an additional direct feedforward path is introduced to compensate for peaking of feedforward structures while preserving frequency selectivity of the feedforward topology. In particular, the direct feedforward path (72) is provided with a scaling by a direct feedforward coefficient (ao) greater than zero and less than one. As a result, overshoot or peaking of classical feedforward topologies can be suppressed while providing interferer immunity, anti-aliazing effects and loop stability.
摘要:
A system and method provide adaptive filtering of radio frequency (RF) signals. Multiple signals are received in a predetermined RF spectrum, the signals including a desired signal and multiple potentially interfering signals. A first signal of the potentially interfering signals is down-converted to a baseband signal, and a power of the baseband signal is determined. When the power exceeds a predetermined threshold power, a first notch filter, corresponding to a frequency of the first signal, is activated.