Frequency sweep device and frequency sweep method

Abstract

The invention relates to a frequency sweep device and a frequency sweep method. The frequency sweep device comprises a multi-path option switch, a first processing unit, a second processing unit and an intermediate frequency filter unit, wherein the multi-path option switch is connected with the first processing unit and the second processing unit respectively and is used for communicating with different active links according to the frequency band of a signal to be tested; the first processing unit is used for performing filtering, amplification, secondary filtering and frequency mixing on the received radio-frequency signals at a first frequency band in turn, and then outputting the radio-frequency signals at the first frequency band to the intermediate frequency filter unit; the secondprocessing unit is used for performing filtering, amplification, secondary filtering and frequency mixing on the received radio-frequency signals at a second frequency band in turn, and then outputting the radio-frequency signals at the second frequency band to the intermediate frequency filter unit; and the intermediate frequency filter unit is used for performing intermediate frequency filtering on the signals after the frequency mixing and then outputting the signals. The frequency sweep device and the frequency sweep method can simultaneously support a plurality of frequency bands of TDD,have low requirements on middle devices, and can effectively reduce the cost.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a frequency scanning device and a frequency scanning method capable of simultaneously supporting multiple frequency bands of Time Division Duplex (TDD). Background technique [0002] Spectrum resources are the basic strategic resources of wireless communication systems, and sufficient spectrum resources are the guarantee for the development of mobile communication network services. With the maturity and commercialization of the third-generation mobile communication technology (3G), the frequency allocated to 3G is 505MHz, of which, the duplex bandwidth of FDD (Frequency Division Duplex) is 350MHz, accounting for 69.3% of all 3G frequencies; TDD The (time-division duplex) bandwidth totals 155MHz, accounting for 30.7% of all 3G frequencies. In these two working modes, TDD has high spectrum utilization and application flexibility. [0003] In actual use, TDD bandwid...

AI Technical Summary

Problems solved by technology

[0005] However, if the conventional frequency scanning device supports three frequency bands A (1880M-1920M), B (2010M-2025M) and C (2300M-2400M) at the same time, the three frequency bands must share the same link; and if If the three frequency bands share the same link, if the local oscillator frequency is not selected properly, the interference between the three frequency bands will be intensified; and, because the gain or insertion loss of the same device in different frequency bands is different, this will easily lead to The intermediate frequency outputs of the last few frequency bands are very different, which affects the frequency scanning function; at the same time, if the three frequency bands share one link, the bandwidth requirements for the related filters and other devices in the frequency scanning device are too high, which greatly increases cost

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