Method to determine transmission quality
AssigneeNokia Mobile Phones Ltd.
InventorsAntti Kansakoski, Markku Hiltunen
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Abstract
A method determines the transmission quality of a signal transmitted by a base station and received by a mobile station in a cellular digital radio telephone network. The mobile station determines the phase error of detected bits a the input of the channel decoder, calculates the average and variance of the phase error. The average and variance are used to calculate the S/N ratio. The S/N ratio information is transmitted to a base station which converts the S/N ratio to a value defining the BER estimate of the received signal.
Claims11
A method for determining the transmission quality of a signal transmitted by a base station and received by a cellular digital radio telephone network mobile station having a channel decoder, comprising the steps of:
- using the channel decoder to detect digital bits in the signal and produce a received bit signal;
- producing a phase error signal related to the phase error of the detected bits in the received bit signal;
- calculating an average and variance of the phase error signal;
- generating a signal-to-nose (S/N) ratio signal of the received signal based on the average and variance values;
- and
- comparing the S/N ratio signal to values stored in a read-only-memory, the stored values defining a bit error rate (BER) estimate of the received signal, the BER estimate defining the transmission quality.
Dependencies are inferred from the claim text.