| 摘要 |
<p>In certain types of transmission system using nQAM it may be desirable to use a control channel superimposed on a nQAM data channel. In such circumstances it is very desirable to be able to separate control channel data from user data without using a higher level protocol layer. For applications in multi-carrier systems with variable bit-loading it is particularly desirable that the control channel data be separable from user data when the value of n, i.e. the bit-loading, or constellation identifier are unknown. Binary data is transmitted using nQAM modulation. The binary data comprises both user data and control data. This means that a control channel is superimposed on a user data channel within the same nQAM constellation. Separation of said control data is facilitated by arranging control data points to have either unique phase, or unique amplitude, values. These unique values are not employed for user data points.</p> |
