A method of, and receiver for, cancelling interfering signals

A receiver and signal technology, applied in electrical components, transmission systems, etc., can solve the problems of expensive receivers and high power, and achieve the effects of saving power, simplifying the architecture, and saving current

Inactive Publication Date: 2007-02-14
KONINKLIJKE PHILIPS ELECTRONICS NV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The disadvantage of the cited interference cancellation technique is that it requires two separate radio receivers to be able to receive a desired wideband signal and an u

Method used

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  • A method of, and receiver for, cancelling interfering signals
  • A method of, and receiver for, cancelling interfering signals
  • A method of, and receiver for, cancelling interfering signals

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Embodiment Construction

[0020] For ease of description, reference will be made to using narrowband Bluetooth RTM signals and wideband IEEE802.11g signals to describe embodiments of the present invention. As known, both signals use ISM (Industrial, Scientific and Medical) frequency band and Bluetooth RTM The signal is a frequency hopping signal and the IEEE 802.11g signal is a spread spectrum signal. It should be understood, however, that the invention is not limited to any particular modulation scheme or frequency band.

[0021] refer to in figure 1 In the shown receiver, an antenna 10 is coupled to an RF bandpass filter 12, which may include a low noise amplifier (not shown). The passband of the filter 12 is chosen so as to pass the wideband signal WB along with the narrowband interfering signal NB, which lies within the frequency band of said wideband signal. The frequency bandwidths of both signals are known or can be predetermined if one of the two signals changes in a predictable manner, eg ...

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PUM

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Abstract

A method of, and receiver for, cancelling an unwanted first signal having a bandwidth at least a part of which overlies the bandwidth of a wanted second signal, the bandwidth of one of the first and second signals being greater than that of the other. The method comprises receiving the first and second signals(10, 12) and respectively frequency down converting(18,22,26 and 20,24,28) the first and second signals to provide first and second low frequency signals. The first and second low frequency signals are digitised using synchronised ADCs(30,32) to provide respective first and second digitised signals, the wider bandwidth signal being digitised at a higher sampling rate and the lower bandwidth signal being digitised at a lower sampling rate. The sampling rate of one of the first and second digitised signals is adjusted(44) to be the same as the other of the first and second digitised signals. Thereafter the frequency of the unwanted signal is shifted(46) to be in the same relative position with respect to the wanted signal as it appeared in the received signal. An output signal is derived by obtaining the difference(40) between the wanted and unwanted signals. In a refinement of the basic method the unwanted signal from the respective ADC is cleaned-up by demodulating it(52) and modulating it(54) which gives the benefit that when subtracting one signal from the other, the section of the wanted signal under the interferer is left intact.

Description

technical field [0001] The invention relates to a method and a receiver for canceling interfering signals. The present invention applies particularly, but not exclusively, to the cancellation of received narrowband interfering signals (such as Bluetooth, registered trademark ( RTM ) signal and vice versa. The present invention can be applied to multi-mode operation and can support Multiple Input Multiple Output (MIMO). Background technique [0002] The prior art discloses many methods for canceling unwanted interfering signals present in the bandwidth of the wanted signal. As an example, EP-A1 1 176 731 discloses a method for detecting narrowband interfering signals (such as Bluetooth RTM ) method for interference cancellation, the broadband communication device is used to receive signals transmitted according to IEEE 802.11, IEEE802.11 or IEEE 802.15.3. The architecture of the device includes Bluetooth RTM A receiver and a broadband receiver having an input coupled to ...

Claims

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Application Information

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IPC IPC(8): H04B1/12H04B1/707H04B1/713
CPCH04B1/7102H04B1/123H04B1/715H04B2001/7152H04B1/10H04B1/7097
Inventor R·菲菲尔德P·布克内尔
Owner KONINKLIJKE PHILIPS ELECTRONICS NV
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