WO1998027663A3 - System for improving the quality of a received radio signal - Google Patents

System for improving the quality of a received radio signal Download PDF

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Publication number
WO1998027663A3
WO1998027663A3 PCT/US1997/022605 US9722605W WO9827663A3 WO 1998027663 A3 WO1998027663 A3 WO 1998027663A3 US 9722605 W US9722605 W US 9722605W WO 9827663 A3 WO9827663 A3 WO 9827663A3
Authority
WO
WIPO (PCT)
Prior art keywords
signal
signals
antennas
transmits
reduce
Prior art date
Application number
PCT/US1997/022605
Other languages
French (fr)
Other versions
WO1998027663A2 (en
Inventor
Sandeep Chennakeshu
Gregory E Bottomley
Paul W Dent
Original Assignee
Ericsson Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ericsson Inc filed Critical Ericsson Inc
Priority to DE69721048T priority Critical patent/DE69721048T2/en
Priority to BR9713943A priority patent/BR9713943A/en
Priority to EP97951614A priority patent/EP0947058B1/en
Priority to JP52779698A priority patent/JP4104023B2/en
Priority to AU55210/98A priority patent/AU5521098A/en
Priority to CA002275283A priority patent/CA2275283C/en
Publication of WO1998027663A2 publication Critical patent/WO1998027663A2/en
Publication of WO1998027663A3 publication Critical patent/WO1998027663A3/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0891—Space-time diversity
    • H04B7/0894—Space-time diversity using different delays between antennas
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/713—Spread spectrum techniques using frequency hopping
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/713—Spread spectrum techniques using frequency hopping
    • H04B1/715—Interference-related aspects
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0667—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of delayed versions of same signal
    • H04B7/0671—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of delayed versions of same signal using different delays between antennas
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0837—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
    • H04B7/084—Equal gain combining, only phase adjustments
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
    • H04B1/12—Neutralising, balancing, or compensation arrangements
    • H04B1/123—Neutralising, balancing, or compensation arrangements using adaptive balancing or compensation means
    • H04B1/126—Neutralising, balancing, or compensation arrangements using adaptive balancing or compensation means having multiple inputs, e.g. auxiliary antenna for receiving interfering signal

Abstract

A delay spread is created in a digital radio signal to reduce the coherence bandwidth and facilitate frequency hopping to reduce the effect of fading losses within an enclosed propagation environment. The delay spread is introduced into the signal in several ways. One technique disclosed employs a transmitter (21) with two separate antennas (26, 27) one of which transmits the digital signal and the other of which transmits the same signal after a phase delay (25) has been introduced into the signal. The carrier frequency of the signals is hopped between at least two frequencies and the receiver processes the resulting signals. In another embodiment, a single transmit antenna (42) is used but the signal is received by two different antennas (43, 44) with the output signal from one of those antennas being phase delayed (45) before combining (46) it with the other prior to processing by the receiver circuitry (47). Phase delay (115) is also introduced at baseband into the signals to be transmitted by rotating the I and Q components of the waveforms before modulation.
PCT/US1997/022605 1996-12-17 1997-12-15 System for improving the quality of a received radio signal WO1998027663A2 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
DE69721048T DE69721048T2 (en) 1996-12-17 1997-12-15 SYSTEM FOR IMPROVING THE QUALITY OF A RECEIVED RADIO SIGNAL
BR9713943A BR9713943A (en) 1996-12-17 1997-12-15 uence between a signal of a first frequency, cia slow, and, process in a digital communication system of slow frequency jump.
EP97951614A EP0947058B1 (en) 1996-12-17 1997-12-15 System for improving the quality of a received radio signal
JP52779698A JP4104023B2 (en) 1996-12-17 1997-12-15 System for improving the quality of received radio signals
AU55210/98A AU5521098A (en) 1996-12-17 1997-12-15 System for improving the quality of a received radio signal
CA002275283A CA2275283C (en) 1996-12-17 1997-12-15 System for improving the quality of a received radio signal

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/768,319 1996-12-17
US08/768,319 US6034987A (en) 1996-12-17 1996-12-17 System for improving the quality of a received radio signal

Publications (2)

Publication Number Publication Date
WO1998027663A2 WO1998027663A2 (en) 1998-06-25
WO1998027663A3 true WO1998027663A3 (en) 1998-08-06

Family

ID=25082158

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1997/022605 WO1998027663A2 (en) 1996-12-17 1997-12-15 System for improving the quality of a received radio signal

Country Status (10)

Country Link
US (2) US6034987A (en)
EP (1) EP0947058B1 (en)
JP (1) JP4104023B2 (en)
CN (2) CN101056134A (en)
AU (1) AU5521098A (en)
BR (1) BR9713943A (en)
CA (1) CA2275283C (en)
DE (1) DE69721048T2 (en)
TW (1) TW362311B (en)
WO (1) WO1998027663A2 (en)

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Also Published As

Publication number Publication date
CA2275283C (en) 2006-12-05
CN101056134A (en) 2007-10-17
US6034987A (en) 2000-03-07
CN100359821C (en) 2008-01-02
CN1245600A (en) 2000-02-23
DE69721048D1 (en) 2003-05-22
TW362311B (en) 1999-06-21
AU5521098A (en) 1998-07-15
JP2001524277A (en) 2001-11-27
EP0947058A2 (en) 1999-10-06
EP0947058B1 (en) 2003-04-16
US5991331A (en) 1999-11-23
JP4104023B2 (en) 2008-06-18
WO1998027663A2 (en) 1998-06-25
CA2275283A1 (en) 1998-06-25
BR9713943A (en) 2000-03-21
DE69721048T2 (en) 2004-04-08

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