Wireless Communication Apparatus
AssigneeNEC Corporation
InventorAkio Tanaka
Life of this patent
Estimating the term…
Abstract
A wireless communication apparatus comprises a local generator for generating a local signal having a frequency equal to the central frequency of the band group; a first down converter for down-converting a wireless signal in each of the bands into an IF signal; a hopping complex filter for removing an image signal in the frequency range of a band to pass therethrough, among down-converted signals, said hopping complex filter having filter characteristics changeable depending on the hopping between the bands; and a second down converter for converting an IF signal of a band which does not contain said central frequency into a baseband signal in a predetermined frequency range about a DC level.
Claims7
A wireless communication apparatus for performing wireless communications while hopping, according to a predetermined sequence, between a plurality of bands each having a predetermined frequency range and making up a band group for wireless communications, comprising:
- a local generator for generating a local signal having a frequency equal to the central frequency of the band group;
- a first down converter for down-converting a wireless signal in each of the bands into an IF signal, using the local signal generated by said local generator;
- a hopping complex filter for removing an image signal in the frequency range of a band to pass therethrough, among down-converted signals, said hopping complex filter having filter characteristics changeable depending on the hopping between the bands;
- and
- a second down converter for converting an IF signal of a band which does not contain said central frequency, among signals having passed through said hopping complex filter, into a baseband signal in a predetermined frequency range about a DC level.
A wireless communication apparatus for performing wireless communications while hopping, according to a predetermined sequence, between a plurality of bands each having a predetermined frequency range and making up a band group for wireless communications, comprising:
- a local generator for generating a local signal having a frequency equal to the central frequency of the band group;
- a first up converter for up-converting a baseband signal to be transmitted into an IF signal;
- a hopping complex filter for removing an image signal in the frequency range of a band to pass therethrough, among up-converted signals, said hopping complex filter having filter characteristics changeable depending on the hopping between the bands;
- and
- a second up converter for converting an IF signal of a band which does not contain said central frequency, among signals having passed through said hopping complex filter, into a signal having a wireless frequency of said band depending the hopping between the bands.
Dependencies are inferred from the claim text.