发明名称 |
Method for transmitting wideband signals via a communication system adapted for narrow-band signal transmission |
摘要 |
A communication system is used to transmit and receive data on a plurality of relatively narrow-band signals and wideband signals. The two signal types share a common electromagnetic spectrum by employing spreading gain and maintaining orthogonality between simultaneously transmitted wideband and narrow-band signals. Signal orthogonality is maintained by selectively choosing orthogonal codes and aligning or spacing a wideband carrier frequency with respect to the narrow-band carrier frequencies in accordance with the ratio of the wideband to the narrow-band chip frequencies. A pilot signal is preferably transmitted contemporaneously with the transmission of the first spread signal, and a control date signal, associated with a plurality of users on the first bandwidth, is transmitted on a common control channel using a single Walsh code that is shared by a plurality of users in a TDMA protocol.
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申请公布号 |
US7483490(B2) |
申请公布日期 |
2009.01.27 |
申请号 |
US20030346883 |
申请日期 |
2003.01.17 |
申请人 |
THE DIRECTV GROUP, INC. |
发明人 |
LEE LIN-NAN;KARIMULLAH KHALID;SUN FENG-WEN;ETEMAD KAMRAN |
分类号 |
H04L27/28;H04B7/005;H04J11/00;H04J13/02;H04K1/10;H04L1/00 |
主分类号 |
H04L27/28 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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