Radio receiver, method of detecting an obtruding signal in the radio receiver, and computer program
A radio receiver and signal technology, applied in electrical components, multi-carrier systems, physical parameter compensation/prevention, etc., can solve the problem of incomplete elimination of filtering
Active Publication Date: 2017-08-18
TELEFON AB LM ERICSSON (PUBL)
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However, filtering usually does not completely eliminate the problem, and some problems may remain
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Embodiment Construction
[0035] figure 1A receiver 100 according to an embodiment is schematically illustrated. The receiver 100 comprises a mixer 102 arranged to mix the received signal with an analog baseband signal at or near zero frequency. The received signal may be received by an antenna 103 which provides a signal to the receiver 100 eg through a duplexer 105 , a bandpass filter 107 and a low noise amplifier 109 which is coupled to the input of the mixer 102 . The mixer 102 is also provided with an oscillator signal LO for mixing. The output of the mixer 102 may be provided to a low-pass filter 104 which limits the bandwidth of the analog baseband signal before being provided to an analog-to-digital converter 106 .
[0036] The analog-to-digital converter 106 converts the analog baseband signal into a digital baseband signal. The analog-to-digital converter may be arranged to use oversampling, ie a sampling rate that is a multiple of the Nyquist frequency required for the nominal bandwidth o...
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A method of detecting an obtruding signal in a radio receiver, a receiver and a computer program are disclosed. The receiver has a mixer arranged to mix a received signal to an analog baseband signal at or close to zero-frequency, a filter arranged to low-pass filter said analog baseband signal, and an analog-to-digital converter arranged to sample said filtered analog baseband signal at a sample frequency such that a digital baseband signal is formed. The method comprised receiving a radio frequency signal, mixing the radio frequency signal to the analog baseband signal at or close to zero-frequency, low-pass filtering said analog baseband signal, and analog-to-digital converting said filtered analog baseband signal at an over sample frequency such that a digital baseband signal is formed. The method further comprises frequency translating the digital baseband signal around a Nyquist frequency being based on a nominal sample frequency, the nominal sample frequency being a fraction of the oversampling frequency according to the oversampling rate, to form a translated digital baseband signal such that signal content of the digital baseband signal around zero frequency will be translated to around the nominal sample frequency and vice versa in the translated digital baseband signal, determining a first signal level at zero frequency of the digital baseband signal and a second signal level at zero frequency of the translated digital baseband signal, detecting an obtruding signal based on a relation between the first and second signal levels, and outputting an obtruding signal state signal.
Description
technical field [0001] The present invention generally relates to a radio receiver, a method of detecting an obtruding signal in a radio receiver and a computer program for implementing the method. In particular, the invention relates to a method for determining offending signals causing aliasing effects in sampled baseband signals. Background technique [0002] Consider radio frequency signals traveling from a transmitter antenna to a receiver antenna. Radio transmission is analog in nature. Radio receivers using digital baseband circuitry thus need to convert from the analog domain to the digital domain at some point. Analog-to-digital conversion can present some problems, and one of them is the aliasing effect. This is handled by applying an anti-aliasing filter before the analog-to-digital converter. However, filtering usually does not completely eliminate the problem, and some problems may still remain. It is therefore desirable to address such residual effects. C...
Claims
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IPC IPC(8): H04B1/10H03M1/06
CPCH03M1/0629H04B1/1027H04L27/38
Inventor S.K.达斯V.库普萨米
Owner TELEFON AB LM ERICSSON (PUBL)