| 摘要 |
PROBLEM TO BE SOLVED: To provide a system and method for enabling multiple transmitters to share a single code division multiplexed (CDM) or code division multiple access (CDMA) channel, using orthogonal waveforms. SOLUTION: A set of orthogonal channelizing codes Wi(t) is generated, and each transmitter is allocated orthogonal channelizing codes and pseudo-noise polynominals in a predetermined manner. The transmitters channelize each user signal using an orthogonal channelizing code Wi(t), and spread each user signal using a pseudo-noise (PN) spreading code. Each transmitter employs the same PN spreading codes and time offsets. Additionally, neither a single orthogonal channelizing code is assigned to more than one transmitter, during the period they are sharing a CDM channel. The spread signals are summed at each transmitter prior to transmission as a composite signal. The offsets and the frequencies of the signals are corrected in advance. COPYRIGHT: (C)2005,JPO&NCIPI |
