Multiplex communications – Communication over free space – Combining or distributing information via code word channels...
Reexamination Certificate
2007-12-25
2007-12-25
Perez-Gutierrez, Rafael (Department: 2617)
Multiplex communications
Communication over free space
Combining or distributing information via code word channels...
C455S450000, C370S441000
Reexamination Certificate
active
10893774
ABSTRACT:
Disclosed is an adaptive downlink packet transmission method for a multicarrier Code Division Multiple Access (MC-CDMA) system. The method can allocate radio resources efficiently according to the variations of channel conditions for each user terminal, allocate transmission power appropriately according to the interference from the same cell, and minimize interference to adjacent cells. The adaptive downlink packet transmission method includes the steps of: a) estimating a signal-to-interference-and-noise ratio (SINR) in a user terminal after channel equalization and despreading by measuring a downlink pilot channel; b) measuring an average interference factor and an average noise power; and c) allocating radio resources adaptively in the central station by determining transmission slots in a transmission frame, the number of spreading codes to be used in each transmission slot, symbol energy for each spreading code, and a transmission method, until transmission slots and packets to be allocated are not available.
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Kim Soo-young
Lee Seong-Pal
Lim Kwang-Jae
Blakely & Sokoloff, Taylor & Zafman
Electronics and Telecommunications Research Institute
Gonzalez Amancio
Perez-Gutierrez Rafael
LandOfFree
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