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Base station apparatus of mobile communication systemRelated Patent Categories: Pulse Or Digital Communications, Spread Spectrum, Direct Sequence, End-to-end Transmission SystemBase station apparatus of mobile communication system description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20070121706, Base station apparatus of mobile communication system. Brief Patent Description - Full Patent Description - Patent Application Claims
CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This application is a continuation of commonly assigned, co-pending U.S. patent application Ser. No. 10/673,658, filed Sep. 29, 2004 and also entitled "Base Station Apparatus of Mobile Communication System", which application is incorporated hereinto by reference in its entirety. That patent application is a divisional application of commonly assigned, co-pending U.S. patent application Ser. No. 09/403,161, filed Jan. 31, 2000 and also entitled "Base Station Apparatus of Mobile Communication System", which application is also incorporated herein by reference in its entirety. BACKGROUND OF THE INVENTION [0002] 1. The Field of the Invention [0003] The present invention relates to a base station in a mobile communications system, and more particularly to a base station capable of carrying out communications with mobile stations through high speed digital communication channels using CDMA. [0004] 2. The Relevant Technology [0005] Recently, base stations in mobile communication systems have become increasingly faster owing to the development of novel communications methods such as CDMA (code division multiple access), which become possible with recent advances in digital communications techniques. In addition, fixed stations are also digitized, and come to use new switching networks such as ATM networks. [0006] Thus, new base stations are required which meet such advances in technology. BRIEF SUMMARY OF THE INVENTION [0007] In the first embodiment of the present invention, there is provided a transmission apparatus comprising: spreading means for spreading an inphase component and a quadrature component of a signal to be transmitted by using a short code and a long code, the long code having an inphase component and a quadrature component that are different from each other, wherein the spreading means is further for carrying out a complex-to-complex operation between a combination of the inphase component and the quadrature component of the signal and a combination of the inphase component and the quadrature component of the long code; and transmission means for transmitting the signal whose inphase component and quadrature component have been spread. Here, the spreading means may spread the inphase component and the quadrature component of the signal by using a same short code for the inphase component and the quadrature component of the signal. In either case, the complex-to-complex operation may be a complex-to-complex multiplication. [0008] In the second embodiment of the present invention, there is provided a reception apparatus comprising: reception means for receiving a spread signal; and despreading means for despreading an inphase component and a quadrature component of the received signal by using a short code and a long code, the long code having an inphase component and a quadrature component that are different from each other, wherein the despreading means is further for carrying out a complex-to-complex operation between a combination of the inphase component and the quadrature component of the received signal and a combination of the inphase component and the quadrature component of the long code. Here, the quadrature component of the long code may be obtained by shifting a phase of the inphase component of the long code. Furthermore, the despreading means may despread the inphase component and the quadrature component of the received signal by using a same short code for the inphase component and the quadrature component of the received signal. In any case, the complex-to-complex operation may be a complex-to-complex multiplication. [0009] In the third embodiment of the present invention, a transmission method comprises: spreading an inphase component and a quadrature component of a signal to be transmitted by using a short code and a long code at least by carrying out a complex-to-complex operation between a combination of the inphase component and the quadrature component of the signal and a combination of the inphase component and the quadrature component of the long code, the long code having an inphase component and a quadrature component that are different from each other; and transmitting the signal whose inphase component and quadrature component have been spread. Here, the complex-to-complex operation may be a complex-to-complex multiplication. [0010] In the fourth embodiment of the present invention, a reception method comprises: receiving a spread signal; and despreading an inphase component and a quadrature component of the received signal by using a short code and a long code at least by carrying out a complex-to-complex operation between a combination of the inphase component and the quadrature component of the received signal and a combination of the inphase component and the quadrature component of the long code, the long code having an inphase component and a quadrature component that are different from each other. Here, the complex-to-complex operation may be a complex-to-complex multiplication. [0011] In the fifth embodiment of the present invention, a communication system comprises a transmission apparatus and a reception apparatus, wherein the transmission apparatus comprises: spreading means for spreading an inphase component and a quadrature component of a signal to be transmitted by using a short code and a long code of the spreading means, the long code of the spreading means having an inphase component and a quadrature component that are different from each other, wherein the spreading means is further for carrying out a complex-to-complex operation between a combination of the inphase component and the quadrature component of the signal to be transmitted and a combination of the inphase component and the quadrature component of the long code; and transmission means for transmitting the signal whose inphase component and quadrature component have been spread. The reception apparatus comprises: reception means for receiving the spread signal; and despreading means for despreading an inphase component and a quadrature component of the received signal by using a short code and a long code of the despreading means, the long code of the despreading means having an inphase component and a quadrature component that are different from each other, wherein the despreading means is further for carrying out a complex-to-complex operation between a combination of the inphase component and the quadrature component of the received signal and a combination of the inphase component and the quadrature component of the long code. Here, once again, the complex-to-complex operation may be a complex-to-complex multiplication. [0012] Additional embodiments are also described herein. BRIEF DESCRIPTION OF THE DRAWINGS [0013] To further clarify the above and other advantages and features of the present invention, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings. It is appreciated that these drawings depict only typical embodiments of the invention and are therefore not to be considered limiting of its scope. The invention will be described and explained with additional specificity and detail through the use of the accompanying drawings in which: [0014] FIG. 1 is a block diagram showing a functional configuration of a base station in accordance with the present invention; [0015] FIG. 2 is a diagram illustrating a structure of a logical channel; [0016] FIG. 3 is a diagram illustrating a structure of a physical channel; [0017] FIG. 4 is a diagram showing the relationship of FIGS. 4A and 4B; [0018] FIG. 4A is a diagram illustrating signal formats of the physical channel; [0019] FIG. 4B is a diagram illustrating signal formats of the physical channel; [0020] FIG. 5 is a graph illustrating simulation results of the dependence of the symbol rate of 32 ksps on the number of pilot symbols; Continue reading about Base station apparatus of mobile communication system... Full patent description for Base station apparatus of mobile communication system Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Base station apparatus of mobile communication system patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. Start now! - Receive info on patent apps like Base station apparatus of mobile communication system or other areas of interest. ### Previous Patent Application: Clear channel assessment method and system for ultra wideband ofdm Next Patent Application: Spread spectrum signal receiver Industry Class: Pulse or digital communications ### FreshPatents.com Support Thank you for viewing the Base station apparatus of mobile communication system patent info. 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