Direct current compensation receiver and signal receiving method based on sequence orthogonal down conversion

Abstract

The invention discloses a direct current compensation receiver based on sequence orthogonal down conversion. The direct current compensation receiver comprises a low-noise amplifier, a sequence orthogonal down converter, an A / D converter, a baseband clock signal generator, a divide-by-two frequency divider and a signal demodulator, wherein the sequence orthogonal down converter comprises a local oscillator, a phase switching circuit, a frequency mixer and a low-pass filter which are connected in sequence; an input end of the low-noise amplifier is connected with an antenna, an output end of the low-noise amplifier is connected with an input end of the frequency mixer; an input end of the A / D converter is connected with an output end of the low-pass filter and an output end of the baseband clock signal generator; and the phase switching circuit is connected with the output end of the baseband clock signal generator. The invention also discloses a direct current compensation signal receiving method based on the sequence orthogonal down conversion. The receiver disclosed by the invention is novel and reasonable in design, the cost is reduced, in-phase component and orthogonal component performance indexes after down conversion can keep high consistence, the problem of direct current bias can be solved, and the practicability is strong.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a DC compensation receiver and a signal receiving method based on sequence quadrature down-conversion. Background technique [0002] The existing commercial mobile communication system is constantly developing towards broadband and high speed, which is closely related to the unprecedented prosperity of the current mobile communication market. People are increasingly demanding higher data rates for wireless communications. The 4th generation mobile communication system has been commercialized on a large scale, and the 5th generation mobile communication system is being extensively and deeply developed. However, in some other special application scenarios, the wireless communication system does not aim at the speed. [0003] For example: the development of the Internet of Things requires a large number of transceiver nodes, and in many cases does not re...

AI Technical Summary

Problems solved by technology

The above-mentioned methods all consider the in-phase and quadrature components for combined compensation. The compensation method leads to an overly complex circuit, increased power consumption and cost, and is affected by the inconsistent performance of the two branches. The compensation effect is limited.

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