Transmission system with improved symbol processing
AssigneeU. S. Philips Corporation
InventorNorbert J. L. Philips
Life of this patent
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Abstract
In OFDM transmission use of an FFT is made for demodulating all carriers simultaneously. In order to prevent adverse influence of intersymbol interference due to multi-path propagation, it is known to determine the impulse response of the transmission medium and to adapt the FFT window accordingly. The center of gravity of the impulse response is now used rather than the first significant value of the impulse response. This has the advantage that the influence of deep fading has less influence on the selection of the FFT window, resulting in an improved performance.
Claims10
Transmission system comprising a transmitter for transmitting a signal containing digital symbols via a transmission medium, and a receiver for receiving the signal transmitted by the transmitter, the receiver comprising:
- means for receiving the signal transmitted by the transmitter;
- means for estimating an impulse response of the transmission medium;
- and
- processing means for processing, in dependence on the impulse response of the transmission medium, the received signal during a predetermined processing period, characterized in that the receiver further comprises:
- means for positioning the predetermined processing period with respect to a symbol duration in dependence on a center position of an auxiliary signal representative of the impulse response of the transmission medium.
Receiver for receiving a signal containing digital symbols transmitted via a transmission medium, the receiver comprising:
- means for receiving the signal;
- means for estimating an impulse response of the transmission medium;
- and
- processing means for processing, in dependence on the impulse response of the transmission medium, the received signal during a predetermined processing period, characterized in that the receiver further comprises:
- means for positioning the predetermined processing period with respect to a symbol duration in dependence on a center position of an auxiliary signal representative of the impulse response of the transmission medium.
Dependencies are inferred from the claim text.