Method for digital wireless communications
First Claim
Patent Images
1. A wireless communications apparatus comprising:
- a transmitter comprisinga first modulator configured to modulate a first pilot symbol according to a first modulation scheme,a second modulator configured to modulate specific first symbols according to a second modulation scheme different from the first modulation scheme, anda timing controller cooperating with said first and second modulators so that modulated specific first symbols are inserted before and after associated modulated first pilot symbols; and
a receiver configured to generate a reception baseband signal based upon modulated second pilot symbols with modulated specific second symbols inserted before and after associated modulated second pilot symbols.
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Abstract
In a multivalue modulation type with one pilot symbol inserted for every 3 or more symbols, signal points of each one symbol immediately before and after a pilot symbol are modulated using a modulation type different from that for pilot symbols. In this way, it is possible to suppress deterioration of the accuracy in estimating the reference phase and amount of frequency offset by pilot symbols and improve the bit error rate characteristic in the signal to noise ratio in quasi-coherent detection with symbols whose symbol synchronization is not completely established.
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Citations
25 Claims
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1. A wireless communications apparatus comprising:
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a transmitter comprising a first modulator configured to modulate a first pilot symbol according to a first modulation scheme, a second modulator configured to modulate specific first symbols according to a second modulation scheme different from the first modulation scheme, and a timing controller cooperating with said first and second modulators so that modulated specific first symbols are inserted before and after associated modulated first pilot symbols; and a receiver configured to generate a reception baseband signal based upon modulated second pilot symbols with modulated specific second symbols inserted before and after associated modulated second pilot symbols. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A wireless communications apparatus comprising:
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a transmitter comprising a first modulator configured to modulate a first pilot symbol according to a first modulation scheme, a second modulator configured to modulate specific first symbols according to a second modulation scheme different from the first modulation scheme, and a timing controller cooperating with said first and second modulators so that modulated specific first symbols are inserted before and after associated modulated first pilot symbols; and a receiver configured to generate a reception baseband signal from a received modulated signal based upon modulated second pilot symbols with modulated specific second symbols inserted before and after associated modulated second pilot symbols. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A method for operating a wireless communications apparatus comprising:
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modulating at a transmitter a first pilot symbol according to a first modulation scheme; modulating at the transmitter specific first symbols according to a second modulation scheme different from the first modulation scheme so that modulated specific first symbols are inserted before and after associated modulated first pilot symbols; and generating at a receiver a reception baseband signal based upon modulated second pilot symbols with modulated specific second symbols inserted before and after associated modulated second pilot symbols. - View Dependent Claims (24, 25)
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Specification