Using orthogonal waveforms to enable multiple transmitters to sh

Details Using orthogonal waveforms to enable multiple transmitters to sh Using orthogonal waveforms to enable multiple transmitters to sh

1996-04-02

2000-10-17

Ngo, Ricky

Multiplex communications

Generalized orthogonal or special mathematical techniques

Particular set of orthogonal functions

370342, 370479, H04B 7216, H04J 1302

Patent

active

061342157

ABSTRACT:
A system and method for enabling multiple transmitters (400) to share a single code division multiplexed (CDM) or code division multiple access (CDMA) channel using orthogonal waveforms. A set of orthogonal channelizing codes W.sub.i (t) is generated, and each transmitter (400) is allocated orthogonal channelizing codes and pseudonoise polynomials in a predetermined manner. The transmitters channelize each user signal using an orthogonal channelizing code W.sub.i (t), and spread each user signal using a pseudonoise (PN) spreading code. Each transmitter employs the same PN spreading codes and time offsets. Additionally, no one orthogonal channelizing code is assigned to more than one transmitter during the time period they are sharing a CDM channel. The spread signals are summed at each transmitter (404) prior to transmission as a composite signal. The offsets are time-precorrected (406, 510) to ensure time alignment at the receivers. The frequencies of the signals are precorrected (408, 512) to ensure frequency alignment at the receivers.

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