Title:
既知の周波数オフセットを与えることにより無線網内の信号弁別を容易にする方法と装置
Document Type and Number:
Japanese Patent JP5033417
Kind Code:
B2
Abstract:
Method and apparatus for demodulation in a system having known frequency offsets. First and second signals from two users occupy substantially the same bandwidth and use substantially the same carrier frequency, while the relative frequencies of the signals on different transmit antennas associated with a base station are adjusted to have known, specific frequency offsets. These known frequency offsets are used at the receiver to aid in estimating any known frequency errors and to demodulate the multiple transmitted signals. In addition to being useful for demodulation, known frequency offsets can be assigned to each of a plurality of base stations to facilitate identification of a particular base station. The approach can be used for any type of time domain multiple access (TDMA) system, including Global System for Mobile (GSM), or for code division multiple access (CDMA) systems.
Inventors:
Molner, Karl, James
Application Number:
JP2006509257A
Publication Date:
September 26, 2012
Filing Date:
March 24, 2004
Export Citation:
Assignee:
Telefon Akti Bora Get Elm Ericson (Pubble)
International Classes:
H04J99/00; H04B7/02; H04B7/04; H04B7/06; H04B7/08
Domestic Patent References:
| JP1041869A | ||||
| JP2001506459A |
Foreign References:
| WO1999056407A1 | ||||
| WO2002069493A1 |
Attorney, Agent or Firm:
Hideto Asamura
Hajime Asamura
Hayashi Zouzo
Kuniaki Shimizu
Hajime Asamura
Hayashi Zouzo
Kuniaki Shimizu