| 摘要 |
<P>PROBLEM TO BE SOLVED: To facilitate discrimination of marks transmitted from different antennas of a base station using known frequency offsets. <P>SOLUTION: In this method, 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 of different antennas associated with a certain base station are adjusted to have known, specific frequency offsets. These known frequency offsets are used at a receiver to aid in estimating any known frequency errors and in demodulating 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 method can be used for any type of time domain multiple access (TDMA) system, including Global System for Mobile (GSM) (R), or for code division multiple access (CDMA) systems. <P>COPYRIGHT: (C)2011,JPO&INPIT |
