Receive method and receiver in communication system

A receive method in a communication system, comprising the steps of:

• receiving a receive signal converted into a carrier band;
• performing analog quasi-coherent detection on said receive signal and outputting in-phase and quadrature signals;
• performing analog-to-digital conversion on said in-phase and quadrature signals;
• dividing said in-phase and quadrature signals into first in-phase and quadrature signal and second in-phase and quadrature signal;
• converting said first in-phase and quadrature signal into a complex baseband signal by a first analytic signal, and converting said second in-phase and quadrature signal into a complex baseband signal by a second analytic signal;
• applying said first in-phase and quadrature signal to a first low-pass filter, and applying said second in-phase and quadrature signal to a second low-pass filter;
• applying said first in-phase and quadrature signal passed through said first low-pass filter and said second in-phase and quadrature signal passed through said second low-pass filter to an adaptive interference canceler;
• and
• removing interference components included in said first in-phase and quadrature signal and said second in-phase and quadrature signal.

A receiver in a communication system, comprising:

• a receiving part which receives a receive signal converted into a carrier band;
• a generating part which generates a quadrature signal from said receive signal;
• a compensating part which compensates orthogonality error and gain imbalance for said receive signal and said quadrature signal;
• and
• a first converting part which converts said receive signal and said quadrature signal into first complex frequency band signal by first analytic sine wave, said first analytic sine wave being a complex signal including cosine wave as the real components and including sine wave as the imaginary components.

A receiver in a communication system, comprising:

• a receiving part which receives a receive signal converted into a carrier band;
• an analog quasi-coherent detector which performs analog quasi-coherent detection on said receive signal and outputting in-phase and quadrature signals;
• an analog-to-digital converter which performs analog-to-digital conversion on said in-phase and quadrature signals;
• a dividing part which divides said in-phase and quadrature signals into first in-phase and quadrature signal and second in-phase and quadrature signal;
• a first converting part which converts said first in-phase and quadrature signal into a complex baseband signal by a first analytic signal, and a second converting part which converts said second in-phase and quadrature signal into a complex baseband signal by a second analytic signal;
• a first low-pass filter which removes high frequency band components from said first in-phase and quadrature signal to, and a second low-pass filter which removes high frequency band components from said second in-phase and quadrature signal;
• an adaptive interference canceler which receives said first in-phase and quadrature signal passed through said first low-pass filter and said second in-phase and quadrature signal passed through said second low-pass filter, and removes interference components included in said first in-phase and quadrature signal and said second in-phase and quadrature signal.