| 摘要 |
A signal (e.g., a UWB signal) is generated that conveys a first information sequence. This generation may employ various modulation techniques, such as OFDM and DSSS. To further convey a second information sequence, this signal is spatially modulated. Then, the signal may be transmitted to a remote device. Accordingly, this may involve emitting it from two or more spatial locations based on the second information sequence. In addition, an initialization process may be performed with the remote device to, for example, provide the remote device with a spatial frame of reference with respect to the spatially modulated signal. The first and second information sequences may both convey data. However, one or both of these sequences may convey various alternative or additional types of information. For example, the first information sequence may convey encrypted data, while the second information sequence provides information for decrypting this data
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