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1. WO2006098392 - METHODS FOR UWB MODULATING M-ARY SEQUENCES

Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

[ EN ]

CLAIMS
1. A method for M-ary modulating a sequence of bits in a wireless communications network, comprising the steps of:
mapping subsequences of M bits of the sequence of bits to corresponding symbols to be M-ary modulated;
selecting, for each current symbol, one of a set of coding sequences according to the symbol;
generating for each symbol a plurality of frames, a number of frames equal to a number of bits in the selected code sequence;
generating, for each bit in each frame, a reference waveform, wherein a phase of the reference waveform depends on the bit; and
generating, for each bit in each frame, a data waveform, wherein a difference in phase between the reference waveform and the data waveform depends on the bit and a previous bit of the coding sequence.

2. The method of claim 1, in which the coding sequences are orthogonal.

3. The method of claim 1, in which the coding sequences are quasi-orthogonal.

4. The method of claim 1, in which the sequence is ternary, and the set includes sixteen coding sequences.

5. The method of claim 1, in which the reference waveform is followed by a plurality of data waveforms.

6. The method of claim 4, in which the reference waveform of a first bit of the coding sequence serves as a reference waveform for all bits in the coding sequence.

7. The method of claim 5, in which a polarity of each data waveforms in each frame is determined according to the selected code sequence.

8. The method if claim 6, in which a polarity of the reference waveform is determined by one of the bits in the subsequence of bits that constitute the symbol and a polarity of codeword sequence.

9. The method of claim 7, in which one wavefoπn in each frame is a reference waveform having a polarity determined by the codeword symbols.

10. The method of claim 8, in which relative polarities for remaining data waveforms of the frame are determined according to subsequence of bits.

11. The method of claim 1 , in which the reference wavefoπns and the data waveforms for all of the bits in the coding sequence constitute a frame, and in which the phase of the reference pulse is determined by a previous symbol of the coding sequence, while the phase difference between the reference pulse and the data pulse is determined by the current symbol.

12. A method for M-aiy modulating a sequence of bits in a wireless communications network, comprising the steps of:
mapping subsequence of M bits of the sequence of bits to corresponding symbols to be M-ary modulated;
selecting, for each symbol, one of a set of coding sequences according to the symbol;
generating, for a first bit in the coding sequence, a reference wavefoπn, wherein a phase of the reference waveform depends on the bit; and
generating, for each bit in the coding sequence, a data waveform of the waveform pair for the bit, wherein a difference in phase between the reference waveform and the data waveform depend on the bit and a previous bit of the coding sequence.

13. A method for M-ary modulating a sequence of bits in a wireless communications network, comprising the steps of:
mapping subsequence of M bits of the sequence of bits to corresponding symbols to be M-ary modulated;
selecting, for each symbol, one of a set of coding sequences according to the symbol;
generating, for each bit in the coding sequence, a reference waveform of a wavefoπn pair for the bit, wherein a phase of the reference waveform depends on the bit; and
generating, for each bit in the coding sequence, a data waveform of the wavefoπn pair for the bit, wherein a difference in phase between the reference wavefoπn and the data wavefoπn in the wavefonn pair depend on an mth bit of the coding sequence.

14. The method of claim 12 or claim 13, in which a polarity of the reference wavefoπn is selected according to a previous symbol, and the phase difference between reference waveform and the data waveform is selected according to the current symbol.