Method and system of differential complex and real multi-carrier demodulation
AssigneeNtt Docomo, Inc.
InventorsHuilin Xu, Chia-Chin Chong, Fujio Watanabe
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Abstract
A method and a receiver are provided for demodulating a received multi-carrier modulated signal. The demodulation procedure includes (a) multiplying the received multi-carrier modulated signal with its complex conjugate to obtain a squared signal; (b) multiplying the squared signal with a carrier demodulating signal to obtain a product signal, and integrating the product signal over the duration T. A bit decision may then be performed on the integration result using analog components without the need for high-speed analog-to-digital conversion.
Claims12
A method for demodulating a received analog multi-carrier modulated data signal, comprising:
- within a receiver, squaring the received analog multi-carrier modulated data signal to obtain an analog squared signal;
- within the receiver, multiplying the analog squared signal with a signal having a frequency
- 2
-
- π
- T
- in order to obtain an analog product signal, where T represents a duration of a symbol in the received multi-carrier modulated signal;
- within the receiver, integrating the analog product signal over the duration T to form an analog integration result;
- and
- making bit decisions using the analog integration result.
A receiver which demodulates a received analog multi-carrier modulated data signal, comprising:
- a squaring circuit for obtaining an analog squared signal from the received analog multi-carrier modulated data signal;
- a mixer for multiplying the analog squared signal with a signal having a frequency
- 2
-
- π
- T
- to obtain an analog product signal, where T represents a duration of a symbol in the received multi-carrier modulated signal;
- an integrator for integrating the analog product signal over the duration T to form an analog integration result;
- and
- a decision circuit for recovering the data from the analog integration result.
Dependencies are inferred from the claim text.