Allen, Dyer, Doppelt, Milbrath & Gilchrist, P.A.
Data transmission system and method using nQAM constellation with a control channel superimposed on a user data channel
A transmission system using nQAM. A control channel is superimposed on a nQAM data channel. It is desirable to separate control channel data from user data without using a higher level protocol layer. 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. that is the bit-loading, or constellation identifier are unknown. Binary data is transmitted using nQAM modulation. The binary data includes 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 the control data is facilitated by arranging control data points to have either a unique phase or unique amplitude values. These unique values are not employed for user data points.
STMicroelectronics N.V.
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Tomas Lars-Ake Lis-Marie Harry Tomas Lennart Gunnar Magnus Daniel Hans Ye Mikael Siwert Goran Anders
Nordstrom Isaksson Ljunggren Tonvall Stefansson Olsson Bahlenberg Johansson Bengtsson Ohman Wen Isaksson Hakansson Okvist Isaksson