Single channel receiver and receiving method

A single channel receiver comprising:

• an input terminal configured to receive an analog input signal,
• an RF mixer configured to down-mix the analog input signal to an intermediate frequency by use of a phase- and/or frequency-corrected oscillator frequency signal and to shift complex-valued information contained in the analog input signal only to an imaginary part to obtain an intermediate real-valued analog signal,
• an analog-to-digital-converter configured to convert the intermediate real-valued analog signal into an intermediate digital signal,
• a demodulator configured to demodulate the intermediate digital signal into a digital output signal,
• a phase tracking loop configured to detect zero-crossings in the intermediate digital signal to obtain phase error information representing a phase error in the intermediate digital signal, wherein the phase tracking loop includes a zero-crossing detector configured to detect a timing of zero-crossings between two consecutive symbols of the intermediate digital signal,
• a timing tracking loop configured to detect signal shape distortions in the digital output signal to obtain timing error information representing a sample timing error in the digital output signal, and
• an oscillator configured to generate the phase- and/or frequency-corrected oscillator frequency signal by use of the phase error information,
• wherein the timing tracking loop includes a decision-directed phase error detector configured to compare amplitudes of the digital output signal at predetermined timings between two consecutive symbols of the digital output signal,
• wherein a first output of the demodulator is provided as a first input to the zero-crossing detector of the phase tracking loop and a second output of the demodulator downstream of the first output is provided as a first input to the decision-directed phase error detector of the timing tracking loop, and
• wherein an output of the decision-directed phase error detector of the timing tracking loop is provided as a second input to the demodulator.

A single channel receiving method comprising:

• receiving an analog input signal,
• down-mixing, using an RF mixer, the analog input signal to an intermediate frequency by use of a phase- and/or frequency-corrected oscillator frequency signal,
• shifting complex-valued information contained in the analog input signal only to the real part or only to the imaginary part to obtain an intermediate real-valued analog signal,
• converting the intermediate real-valued analog signal into an intermediate digital signal,
• demodulating, using a demodulator, the intermediate digital signal into a digital output signal,
• detecting, using a zero-crossing detector of a phase tracking loop, zero-crossings in the intermediate digital signal to obtain phase error information representing a phase error in the intermediate digital signal by detecting a timing of zero-crossings between two consecutive symbols of the intermediate digital signal,
• detecting, using a timing tracking loop, signal shape distortions in the digital output signal to obtain timing error information representing a sample timing error in the digital output signal, and
• generating the phase- and/or frequency-corrected oscillator frequency signal by use of the phase error information,
• wherein the timing tracking loop includes a decision-directed phase error detector configured to compare amplitudes of the digital output signal at predetermined timings between two consecutive symbols of the digital output signal,
• wherein a first output of the demodulator is provided as a first input to the zero-crossing detector of the phase tracking loop and a second output of the demodulator downstream of the first output is provided as a first input to the decision-directed phase error detector of the timing tracking loop, and
• wherein an output of the decision-directed phase error detector of the timing tracking loop is provided as a second input to the demodulator.

A single channel receiving method comprising:

• receiving an analog input signal,
• down-mixing, using an RF mixer, the analog input signal to an intermediate signal by use of a phase- and/or frequency-corrected oscillator frequency signal,
• shifting complex-valued information contained in the analog input signal only to the imaginary part to obtain an intermediate real-valued analog signal,
• converting the intermediate real-valued analog signal into an intermediate digital signal,
• demodulating, using a demodulator, the intermediate digital signal into a digital output signal,
• detecting, using a zero-crossing detector of a phase tracking loop, zero-crossings in the intermediate digital signal to obtain phase error information representing a phase error in the intermediate digital signal by detecting a timing of zero-crossings between two consecutive symbols of the intermediate digital signal,
• detecting, using a timing tracking loop, signal shape distortions in the digital output signal to obtain timing error information representing a sample timing error in the digital output signal, and
• generating the phase- and/or frequency-corrected oscillator frequency signal by use of the phase error information,
• wherein the timing tracking loop includes a decision-directed phase error detector configured to compare amplitudes of the digital output signal at predetermined timings between two consecutive symbols of the digital output signal,
• wherein a first output of the demodulator is provided as a first input to the zero-crossing detector of the phase tracking loop,
• wherein a second output of the demodulator is provided as a first input to the decision-directed phase error detector of the timing tracking loop, wherein an output of the decision-directed phase error detector of the timing tracking loop is provided as a second input to the demodulator.