发明名称 |
Application of a pseudo-randomly shuffled Hadamard function in a wireless CDMA system |
摘要 |
A method of improving bandwidth of wireless CDMA systems by shuffling the rows of a Hadamard function in a pseudo-random manner. A Hadamard function is used to provide orthogonality between users. The orthogonal waveforms are used to prevent interference from different users sharing the same cell as well as multiple channels from the same user. The rows of the Hadamard function are shuffled in a pseudo-random manner. This effectively maximally spreads the spectral density of the transmitted signal out across the available spectrum. These codes are pre-computed and stored in lookup tables of mobile wireless devices. The data signals are modulated by one set of codes. Thereby, one data bit can be transmitted per chip.
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申请公布号 |
US2005047482(A1) |
申请公布日期 |
2005.03.03 |
申请号 |
US20040943677 |
申请日期 |
2004.09.16 |
申请人 |
GOSSETT AND GUNTER, INC. |
发明人 |
GOSSETT CARROLL PHILIP;GUNTER MICHIAL ALLEN |
分类号 |
H04J11/00;(IPC1-7):H04B1/707 |
主分类号 |
H04J11/00 |
代理机构 |
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