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US 6,687,507 B2Granted
Time of arrival estimation for edge/GSM
AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorsSven Fischer, Ari Kangas
Life of this patent
Estimating the term…
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AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorsSven Fischer, Ari Kangas
Estimating the term…
In systems which transmit both GSM modulated and EDGE modulated signals, time of arrival estimations can be improved without requiring the detection of the type of modulation used on the received signal. In accordance with the present invention, a received signal is initially demodulated by a receiver in accordance with a first demodulation scheme. The demodulated signal is split into two copies. Taking into account the initial demodulation, one of the copies is demodulated in accordance with another demodulation scheme, thereby resulting in a first signal demodulated in accordance with the first demodulation scheme and a second signal demodulated in accordance with a second demodulation scheme. A training sequence is used to correlate the two signals which are then summed in a incoherent integration process. The result of the incoherent integration is used to estimate the time of arrival of the received signal.
In a mobile telecommunications network wherein each burst of data is modulated in accordance with one of a first or a second modulation scheme, a method for estimating time of arrival comprising the steps of:
In a Global System for mobile telecommunications (GSM) based network that employs Enhanced Data Rates for Global Evolution (EDGE), a method for estimating time of arrival comprising the steps of:
In a mobile station comprising:
Dependencies are inferred from the claim text.