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US 6,725,055 B2Granted
SIR estimation using delay time of power control commands
AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorJohan Nilsson
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AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorJohan Nilsson
Estimating the term…
A method is provided for estimating the SIR of signals transmitted between a mobile unit and a base station, wherein the signals comprise pilot and data symbol blocks transmitted during each of a succession of time slots. Initially, the signals of a group of slots are directed to the receiver, which may be either the mobile unit receiver or the base station receiver. SIR estimates and corresponding power changes are computed for each slot in the initial group, employing only respective pilot symbols thereof. The SIR estimates derived from the initial slot group are used to compute the delay time of power control commands sent from the receiver to the transmitter, in order to adjust the power level thereof. The SIR for signals of a specified slot, which follows the initial slot group, is then estimated from the time delay, from the pilot block of the specified slot, and from the data block of the slot immediately preceding the specified slot, collectively.
In a communication system provided with a first unit disposed to transmit signals which comprise pilot and data symbol blocks in each of a succession of time slots, and further provided with a remotely located second unit disposed to receive said transmitted signals, a method for estimating the SIR of said transmitted signals at said receiving second unit, said method comprising the steps of:
A communication system comprising:
Dependencies are inferred from the claim text.