An apparatus for implementing a wideband mdticarrier as recited in Claim 1, the apparatus further comprising: a cbck generator for supplying a cbck signd to the digitd channelizer; and a phase bcked bop (PLL) for receiving the cbck signd from the cbck generator and supplying an N times mdtiplied cbck signd to the digitd IF modulation portion. An apparatus for implementing a wideband mdticarrier as recited in Claim 1 or 2, the digitd channelizer comprising: a plurality of pdse shapers for receiving the complex digitd moddation signd and separating each channel signd from adjacent channel signds; a plurality of complex mixers for complex^noddafing each of the channel signds outputted from the respective pdse shapers; and an adder for adding I and Q signds that are complex^noddated from the plurality of complex mixers.However, the invention implements a wideband multicarrier by newly employing a digital channelizer and a digital IF modulation portion.Since the former can efficiently generate a plurality of carrier signals having different center frequencies and the latter can up-convert the generated carrier signals into a desired multicarrier, the invention can obtain a more reliable wideband multicarrier and implement a wideband multicarrier in a cost-effective manner. An apparatus for implementing a wideband mdticarrier, the apparatus comprising: a digitd channelizer for pdse-shaping complex digitd moddation signds, digitaly mixing the signds and dividing the signds into individud signds having different center frequencies; and a digitd intermediate frequency (IF) moddation portion for moddating the divided signds into individud IF signds to generate a wideband mdticarrier IF signd.As the technology regarding information storage media and telecommunication advances, there is an increased demand for wireless communication applications for various multimedia contents such as Internet connection, real time transportation information, wireless broadcasting, video on demand and Internet games.In order to provide these various mv Jtimedia contents with a restricted bandwidth, the data transmission of high-speed and high-capacity should be accomplished and the efficiency of the power spectrum should be enhanced.The present invention relates to an apparatus and a method for implementing a wideband multicarrier by using complex digital modulation.
Analog circuits, as many as the number of desired carrier signals in a multicarrier, are required.Hence, it is possible to obtain a more reliable wideband multicarrier and implement a wideband multicarrier in a cost-effective manner. 6 ilustrates the output power spectrum from the digital channelizer shown in Rg. It is merely representative of the presently preferred embodiments of the invention. The foregoing and other objects and features of the present invention wil become more fuly apparent from the f bwing description, appended claims and their accompanying drawings. 5 flbjstrates the output power spectrum from the complex mixer shown in Eg. The presently preferred embodiments of the invention wil be best understood by reference to the drawings, wherein like parts or steps are designated by like numerals throughout.Disclosure of Invention Technical Problem  Conventionaly, Anabg Quadrature Modulation (ACM) was used in order to modulate the complex digital signal into intermediate frequency (TF) signals or radio frequency (RF) signals.In the AQM, there should be a balance between VQ signal paths; and a local oscϋator (LO) signal, that is, sine/cosine pulses should be ideal.