METHOD TO MINIMIZE COMPATIBILITY ERROR IN HIERARCHICAL MODULATION USING VARIABLE PHASE
摘要
The present invention provides a method, receiver and transmitter for use in a SDAR system. The method involves generating a first modulated signal based on first input data. Additional modulation is superimposed on the first modulated signal based on additional input data, being spread across a plurality of symbols in the first modulated signal in a predetermined pattern to generate a modified signal which is then transmitted. The modified signal is decoded by performing a first demodulation of the first modulated signal then additional demodulation is performed to obtain additional input data. The superimposing step uses a plurality of offset sequence values to add the additional modulation to the first modulated signal. The offset sequence may appear as a pseudo-random distribution of offset sequence values, and may include at least one zero offset value. Alternatively, the additional modulated signal may be a fromed as a direct sequence spread spectrum modulation and the offset sequence appearing as a pseudo-noise distribution. A Hadamard matrix sequence may be used as the direct sequence code.
申请公布号
WO2005055489(A2)
申请公布日期
2005.06.16
申请号
WO2004US38607
申请日期
2004.11.17
申请人
DELPHI TECHNOLOGIES, INC.;WALKER, GLENN, A.;DIBIASO, ERIC, A.;HIATT, MICHAEL, L., JR.
发明人
WALKER, GLENN, A.;DIBIASO, ERIC, A.;HIATT, MICHAEL, L., JR.