Method for simplifying the demodulation in multiple carrier transmission system
AssigneeU.S. Philips Corporation
InventorTimothy J. Moulsley
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Abstract
A transmission system for the transmission of a signal having a number of carriers provides a simplified demodulation function. The simplification is achieved by reducing the quantity of arithmetic operations that are required, particularly when only one or a few channels have to be received and demodulated.
Claims2
Transmission system for transmission of a signal comprising a number of carriers, each of which is represented by a sinusoid with a phase modulated by a data signal, the carriers forming a harmonically related set of signal components with a period equal to the reciprocal of a minimum frequency separation between each component, the base-band representation of said carriers being such that one of the carriers is positioned at zero frequency, wherein samples S(t) of the signal are processed in the following way:
- X ( t ) = ∑ n = 1 n = N r S ( t + n · f s f sep )
- with
- t being an integer of a value running from t=1 to t=fs/fsep,
- n being an integer of a value running from n=1 to n=Nr and
- Nr being defined as Nr=fsep/fsym,
- where
- fs is the receiver sampling frequency,
- fsym is the symbol rate on a single carrier,
- fsep is the carrier separation and
- X(t) is the output signal as obtained by said processing.
Dependencies are inferred from the claim text.