[특허]Wireless direct sequence spread spectrum digital cellular telephone system

Wireless direct sequence spread spectrum digital cellular telephone system 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H04B-007/216 H04J-013/00
출원번호	US-0257324 (1994-06-07)
발명자 / 주소	Bustamante Herman (Millbrae CA) Natali Francis (Townsend WA) Magill David T. (Palo Alto CA)
출원인 / 주소	Stanford Telecommunications, Inc. (Sunnyvale CA 02)
인용정보	피인용 횟수 : 53 인용 특허 : 0

초록 ▼

The present invention is based on novel implementation techniques which makes orthogonal CDMA practical in a short range mobile telephone environment where significant multipath fading exists. Specifically, this invention provides novel techniques for establishing the time base, frequency, and power control necessary to achieve orthogonality. Use of a high power sounding burst on the outbound link permits: 1) antenna diversity selection to minimize the probability of a faded condition, 2) local frequency locking at the subscriber terminal which avoids the requirement for a costly precision frequency standard, and 3) essentially instantaneous inbound power control based on the outbound receive signal level. This is effective since time division duplexing is used and both transmission and reception take place on the same frequency. With the short frame structure and unique placement of the sounding burst the correlation between the outbound and inbound path losses is very high. Thus, according to the invention, the signal structure and control algorithms result in a greatly reduced signal level range at the base station/PBX to achieve high efficiency in a orthogonal CDMA system. Real world effects such as filtering, multipath time spread, and time base error destroy orthogonality and introduce a degree of cross coupling between supposedly orthogonal channels. Thus, the invention provides accurately controlled power levels in this highly dynamic environment.

대표청구항 ▼

In a spread spectrum orthogonal code division multiple access (OCDMA) communication system having at least one base station and a plurality of user handsets in which a set of orthogonal Radamacher-Walsh (RW) function are overlaid with a pseudonoise (PN) sequence forming a coded spreading sequence for an information signal, each orthogonal function of said set carries voice data for a single user in said system, a source of selected carrier signals and means to modulate said information signal on said carrier signal to form a transmit signal with said coded spreading sequence on said transmit signal for radio broadcasting between said at least one base station and said user handsets, each said user handset having a time base and means for controlling its power transmission, and wherein the base station transmits a sounding signal, the method of controlling operation of said handsets, the improvement comprising: (1) measuring the time base error of each handset at said base station and transmitting time base correction information from said base station to each handset and controlling the timing of operation of each handset thereby, respectively, and (2) measuring the power of the sounding signal and performing the compensation of the handset transmit power using instantaneous power control of handset to base station link so as to avoid signal interference.

이 특허를 인용한 특허 (53)

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Inchul Kang ; Winston Y. Sun, CDMA receiver and method of operation.
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Ozluturk, Fatih M.; Jacques, Alexander M.; Lomp, Gary R.; Kowalski, John, Code division multiple access (CDMA) communication system.
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Lomp Gary ; Ozluturk Fatih, Efficient multipath centroid tracking circuit for a code division multiple access (CDMA) system.
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Lomp, Gary R.; Ozluturk, Faith, Efficient multipath centroid tracking circuit for a code division multiple access (CDMA) system.
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Lomp, Gary; Ozluturk, Fatih, Efficient multipath centroid tracking circuit for a code division multiple access (CDMA) system.
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Kaneko, Keiichi; Takaoka, Katsumi; Matsui, Kazunari; Saiki, Takaaki, Generation and decoding of multi-carrier signal.
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Agee,Brian G.; Bromberg,Matthew; Gerlach,Derek; Gibbons,David; Golden,James Timothy; Ho,Minnic; Hoole,Elliott; Jesse,Mary; Maxwell,Robert Lee; Mechaley, Jr.,Robert G.; Naish,Robert Ray; Nix,David J.;, Highly bandwidth-efficient communications.
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Agee,Brian G.; Bromberg,Matthew; Gerlach,Derek; Gibbons,David; Golden,James Timothy; Ho,Minnie; Hoole,Elliott; Jesse,Mary; Maxwell,Robert Lee; Mechaley, Jr.,Robert G.; Naish,Robert Ray; Nix,David J.;, Highly bandwidth-efficient communications.
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Ramesh Rajaram ; Chennakeshu Sandeep ; Bottomley Gregory E., Measurement techniques for diversity and inter-frequency mobile assisted handoff (MAHO).
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Ozluturk, Fatih; Lomp, Gary R.; Kowalski, John, Method and apparatus for adaptive power control for spread-spectrum communications.
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Odenwalder, Joseph P.; Lundby, Stein A.; Wheatley, III, Charles E.; Tiedemann, Jr., Edward G., Method and apparatus for obtaining transmit diversity using switched antennas.
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Christopher L. Johnson ; Michael W. Loos ; Mark R. Poulin ; Chin P. Wong ; Patrick J. Doran ; Martin T. Karanja, Method and apparatus for transmitting and receiving information in a time slot.
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Ozluturk, Fatih; Lomp, Gary, Method and subscriber unit for performing power control.
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Alami Samir ; Chang Kim, Method and system for avoiding communication failure in CDMA systems.
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Jalali,Ahmad, Method and system for utilizing polarization reuse in wireless communications.
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Alamouti, Siavash; Casas, Eduardo F.; Hirano, Michael; Hoole, Elliott; Jesse, Mary; Michelson, David G.; Poon, Patrick; Veintimilla, Gregory J.; Zhang, Hongliang, Method for frequency division duplex communications.
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Alamouti, Siavash; Casas, Eduardo F.; Hirano, Michael; Hoole, Elliott; Jesse, Mary; Michelson, David G.; Poon, Patrick; Veintimilla, Gregory J.; Zhang, Hongliang, Method for frequency division duplex communications.
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Alamouti, Siavash; Casas, Eduardo F.; Hirano, Michael; Hoole, Elliott; Jesse, Mary; Michelson, David G.; Poon, Patrick; Veintimilla, Gregory J.; Zhang, Hongliang, Method for frequency division duplex communications.
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Alamouti, Siavash; Casas, Eduardo F.; Hirano, Michael; Hoole, Elliott; Jesse, Mary; Michelson, David G.; Poon, Patrick; Veintimilla, Gregory J.; Zhang, Hongliang, Method for frequency division duplex communications.
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Narasimhan Ravi ; Cox Donald C., Method for handoff in wireless communication systems using pattern recognition.
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Kang Mi Jung,KRX, Method for improving the selection capability of a TSB in CDMA and PCS systems.
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Raffel, Michael A.; Bamburak, Michael D.; Glass, David R.; Jarett, Keith; Kibria, Masud; Lawrence, Christopher G.; Lee, Tony S.; Leuca, Ileana A.; Marx, Joseph P.; Nelson, Roderick; O'Neill, Paul B.;, Method of providing cellular and landline cordless service using a dual mode mobile telephone.
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Lucidarme,Thierry; Ben Rached,Nidham, Method of transmitting radio signals with polarization diversity and radiocommunication station and terminal for implementing the method.
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Minematsu, Toru, PN code generation apparatus and method, and radio communication apparatus.
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Li,Yingxue, Processing diversity signals at a mobile device using phase adjustments.
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Lomp, Gary; Ozluturk, Fatih; Silverberg, Avi, Transferring voice and non-voice data.
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Barnett, Kenneth Charles; Persico, Charles J.; Peterzell, Paul, Transmit power reduction for a wireless device with multiple transmit signal paths.
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Hoole Elliott, Transmit/receive compensation in a time division duplex system.
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Laudel, Kennan; Kang, Inchul, Variable clock rate correlation circuit and method of operation.
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Alamouti,Siavash; Becker,Joel E.; Stolarz,Douglas Frank, Vertical adaptive antenna array for a discrete multitone spread spectrum communication system.
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Alamouti, Siavash; Becker, Joel E.; Stolarz, Douglas Frank, Vertical adaptive antenna array for a discrete multitone spread spectrum communications system.
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Alamouti, Siavash; Becker, Joel E.; Stolarz, Douglas Frank, Vertical adaptive antenna array for a discrete multitone spread spectrum communications system.
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Jarett Keith ; Williams Roland E. ; Raffel Michael A. ; Nelson Roderick ; Leuca Ileana A. ; Lee Tony S. ; Lawrence Christopher G. ; Kibria Masud ; Glass David R. ; Bamburak Michael D., Wireless communication system having mobile stations establish a communication link through the base station without u.
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연합인증

Wireless direct sequence spread spectrum digital cellular telephone system 원문보기

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Wireless direct sequence spread spectrum digital cellular telephone system 원문보기

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