Method of estimating a channel, and a radio system
AssigneeNokia Corporation
InventorsJuha Ylitalo, Esa Tiirola, Matti Kiiski
Life of this patent
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Abstract
The invention relates to a method of estimating a downlink channel in a radio system, and to a radio system. The method comprises transmitting a common pilot signal and a user-specific pilot signal, of which channel estimates are formed. A channel estimate for the user-specific channel that has transmitted the user-specific pilot signal is formed of said channel estimates by selecting an appropriate scaling factor. The quality of the user-specific channel estimation and thus also the performance of the radio system are improved by means of the invention.
Claims34
A method of estimating a downlink channel in a radio system, the method comprising the steps of:
- transmitting a common pilot signal from the network part;
- transmitting from the network part a user-specific pilot signal in a user-specific channel;
- receiving the common pilot signal in user equipment;
- receiving the user-specific pilot signal in user equipment;
- generating an impulse response of the common pilot signal;
- generating an impulse response of the user-specific pilot signal,
- the method comprising a further step of:
- generating an impulse response of a user-specific channel, based on the impulse response of the common pilot signal and the impulse response of the user-specific pilot signal.
A radio system, comprising:
- a network part for forming a fixed infrastructure for the radio system;
- user equipment for forming a mobile infrastructure for the radio system;
- the network part comprising means for transmitting a common pilot signal;
- the network part comprising means for transmitting a user-specific pilot signal in a user-specific channel;
- the user equipment comprising means for generating an impulse response of the common pilot channel;
- the user equipment comprising means for generating an impulse response of the user-specific pilot signal;
- the user equipment further comprising:
- impulse response means for generating an impulse response of the user-specific channel, based on the impulse response of the common pilot signal and the impulse response of the user-specific pilot signal.
Dependencies are inferred from the claim text.