[특허]CDMA base station modulator for digital cellular mobile communication systems

[미국특허] CDMA base station modulator for digital cellular mobile communication systems 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H04K-001/02 H04J-011/00 H04J-013/00
출원번호	US-0348071 (1994-11-23)
우선권정보	KR-0026127 (1993-12-01)
발명자 / 주소	Kim Jin U. (Daejeon KRX) Kim Sun Y. (Daejeon KRX) Lee Jeom D. (Daejeon KRX) Lee Sung K. (Daejeon KRX)
출원인 / 주소	Electronics and Telecommunications Research Institute (Daejeon KRX 03)
인용정보	피인용 횟수 : 61 인용 특허 : 8

초록 ▼

A base station modulator for the digital cellular mobile communication system achieves reduced hardware complexity in a base band QPSK modulating circuit by applying the Multilevel Logic Operation (MLO) which is extended from the conventional binary exclusive-OR operation, to the conventional Base Station Modulator (BSM). The base station modulator includes a plurality of spreaders 621 for QPSK spreading of a voice data stream. These spreaders 621 employ binary-multilevel Logic (MLO) gates instead of multiple binary exclusive-OR gates. The binary-multilevel Logic gate includes a subtractor 510 and a selector 520. The subtractor has one input (-) to which multilevel logic values are applied and one input (+) to which a maximum logic level of the multilevel logic values is applied. The selector has one input to which the multilevel logic values are applied, one input to which the output signal of the subtractor 510 is applied, and one control input to which the binary logic value is applied. If the binary logic value is zero (0), the selector 520 selects and outputs the multilevel logic values, and if the binary logic value is one (1), the selector 520 selects and outputs the output signal from the subtractor 510.

대표청구항 ▼

A base band Quaternary Phase Shift Keying (QPSK) modulating circuit in a CDMA digital mobile communication system which includes a summing means for summing a plurality of Walsh covered signals from a plurality of Walsh sequence covers and a Pilot pseudorandom noise sequence generator, comprising: a binary-multilevel Exclusive-ORing means for Exclusive-ORing multilevel outputs from said summing means and Pilot PN sequences from the Pilot PN sequence generator; and a finite impulse response (FIR) filtering means, connected to the binary-multilevel Exclusive-ORing means, for FIR filtering the output signals of the binary-multilevel Exclusive-ORing means.

이 특허에 인용된 특허 (8) 인용/피인용 타임라인 분석

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이 특허를 인용한 특허 (61) 인용/피인용 타임라인 분석

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[미국특허] CDMA base station modulator for digital cellular mobile communication systems 원문보기

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[미국특허] CDMA base station modulator for digital cellular mobile communication systems 원문보기

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