초록 ▼

The present invention is a communication system and method having a base station for communication with multiple remote units. The system comprises a base station which utilizes a plurality of sets of frequencies for selectively communicating with remote units in a predefined coverage area. The cove

The present invention is a communication system and method having a base station for communication with multiple remote units. The system comprises a base station which utilizes a plurality of sets of frequencies for selectively communicating with remote units in a predefined coverage area. The coverage area is divided into N concentric regions, where each concentric region is assigned one of the plurality of frequency sets such that for any given concentric region a different frequency set is assigned than the frequency sets assigned to all other adjacent concentric regions. The base station includes a means for communicating data to a remote unit over the set of frequencies associated with the respective concentric region as the remote unit travels from one concentric region to another. The system also comprises at least one remote unit having means for communicating with the base station over the set of frequencies associated with the respective concentric region as the remote unit travels from one concentric region to another.

대표청구항 ▼

The present invention is a communication system and method having a base station for communication with multiple remote units. The system comprises a base station which utilizes a plurality of sets of frequencies for selectively communicating with remote units in a predefined coverage area. The cove

The present invention is a communication system and method having a base station for communication with multiple remote units. The system comprises a base station which utilizes a plurality of sets of frequencies for selectively communicating with remote units in a predefined coverage area. The coverage area is divided into N concentric regions, where each concentric region is assigned one of the plurality of frequency sets such that for any given concentric region a different frequency set is assigned than the frequency sets assigned to all other adjacent concentric regions. The base station includes a means for communicating data to a remote unit over the set of frequencies associated with the respective concentric region as the remote unit travels from one concentric region to another. The system also comprises at least one remote unit having means for communicating with the base station over the set of frequencies associated with the respective concentric region as the remote unit travels from one concentric region to another. esearch, Lulea, Sweden, Pgs. 1-6. Antipolis, Sophia, A Conceptual Study of OFDM-Based Multiple Access Schemes, Part 4: Tracking of Time and Frequency Offset, Telia Research, Dec. 1996, Pgs. 1-12. Van De Beek, J., Sandell, M., Borjesson, P., ML Estimation of Timing and Frequency Offset in Multicarrier Systems, Division of Signal Processing, Lulea University of Technology, Lulea, Sweden, Apr., 1996, Pgs. 1-24. Sandell, M., Edfors, O., A Comparative Stud y of Pilot-Based Channel Estimators for Wireless OFDM, Sep. 1996, Pgs. 1-34. Lulea University of Technology, Division of Signal Processing, Synchronization in OFDM, Mar. 27, 1998, Pgs. 1-3. Van De Beek, J., Sandell, M., Borjesson, P., On Synchronization in OFDM Systems Using the Cyclic Prefix, Division of Signal Processing, Lulea University of Technology, Lulea, Sweden, Pgs. 1-5. Van De Beek, J., Sandell, M., Isaksson, M., Borjesson, P., Low-Complex Frame Synchronization in OFDM Systems, Division of Signal Processing, Lulea University of Technology, Lulea, Sweden, Telia Research, Lulea, Sweden, Pgs. 1-5. Isaksson, Mikael, Proposal: Option for In-Band POT and ISDN, Standards Project: T1E1.4:VDSL Sep. 22-26, 1997, Pgs. 1-5. Sandell, M., Van De Beek, J., Borjesson, P., Timing and Frequency Synchronization in OFDM Systems Using the Cyclic Prefix, Division of Signal Processing, Lulea University of Technology, Lulea, Sweden, Pgs. 1-4. Edfors, O., Sandell, M., Van De Beek, J., Wilson, S., Borjesson, P., Analysis of DFT-Based Channel Estimators for OFDM, Vehicular Technology Conference (VTC'96), Chicago, Illinois, Jul. 25-28, 1995, Pgs. 1-25. Edfors, O., Sandell, M., Van De Beek, J., Landstrom, D., Sjoberg, F., An Introduction to Orthogonal Frequency-Division Multiplexing, Sep. 1996, Pgs. 1-58. Edfors, Ove, Low-Complexity Algorithms in Digital Receivers, Doctoral Thesis, Lulea University of Technology, Sep. 1996, Pgs. 1-190.