[특허]Diversity for direct-sequence spread spectrum systems

[미국특허] Diversity for direct-sequence spread spectrum systems 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H04B-007/216 H04B-007/06
출원번호	US-0200090 (1994-02-22)
발명자 / 주소	Weerackody Vijitha (Springfield NJ)
출원인 / 주소	AT&T Corp. (Murray Hill NJ 02)
인용정보	피인용 횟수 : 76 인용 특허 : 0

초록 ▼

An invention for providing diversity for direct sequence spread spectrum wireless communication systems is presented. The invention provides a transmitting technique for communicating a first signal comprising one or more segments to a receiver with use of a plurality of M antennas. The first signal includes one or more signal segments. The technique comprises forming M copies of the first signal; for a segment of a signal copy, weighting each of two or more sub-segments of the segment with a distinct signal, wherein a sequence of the distinct weighting signals for the segment is distinct from sequences of signals weighting the same segment of one or more other signal copies; and for each of M weighted signal copies, transmitting a signal to the receiver using a distinct antenna, the transmitted signal based on the weighted signal copy. Illustratively, the first signal is a spread spectrum signal. Moreover, the process of weighting comprises applying a phase shift to a sub-segment. The invention further provides a receiving technique which comprises, for a copy of a received signal, despreading a segment of the received signs, demodulating a plurality of sub-segments of the despread signal segment, wherein each sub-segment is demodulated with use of one or more estimated communication channel characteristics corresponding to the sub-segment, and forming a summation signal reflecting a summation of a plurality of demodulated sub-segments. The receiving technique further comprises forming a signal reflecting a signal segment value, the formed signal based on one or more summation signals. The step of demodulating may precede the step of despreading in some embodiments.

대표청구항 ▼

A method of operating a direct-sequence spread spectrum transmitter for communicating a first signal to a receiver, said transmitter including a plurality of antennas, said first signal including one or more signal segments, the method comprising the steps of: forming a plurality of second signals, each of the second signals formed based on two or more sub-segments of a given segment of the first signal and two or more corresponding weighting signals, wherein a sequence of weighting signals used in forming one of said second signals is distinct from one or more other sequences of weighting signals used in forming one or more other of said second signals; and transmitting a plurality of signals each with a distinct antenna, wherein at least two of said plurality of transmitted signals represent second signals which are formed with use of distinct sequences of weighting signals.

이 특허를 인용한 특허 (76) 인용/피인용 타임라인 분석

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[미국특허] Diversity for direct-sequence spread spectrum systems 원문보기

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