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US 9,059,787 B1Granted
Estimating transmission power and noise level of received signal in a CDMA receiver
AssigneeMarvell International Ltd.
InventorMeir Griniasty
Life of this patent
Estimating the term…
Abstract
A method in a communication terminal includes receiving a CDMA signal that was transmitted over a communication channel by a base station at a given transmission power, and received at the communication terminal with noise of a given noise level. The CDMA signal includes at least a pilot channel that was spread using a pilot spreading sequence. The received CDMA signal is de-spread with the pilot spreading sequence, and a pilot amplitude of the pilot channel is calculated based on the de-spread CDMA signal. Based on the received CDMA signal and the pilot amplitude, the transmission power of the base station and the noise level of the noise are estimated.
Claims18
A method, comprising:
- in a communication terminal, receiving a Code-Division Multiple Access (CDMA) signal that was transmitted over a communication channel by a base station at a given transmission power and received at the communication terminal with noise of a given noise level, wherein the CDMA signal comprises at least a pilot channel that was spread using a pilot spreading sequence;
- de-spreading the received CDMA signal with the pilot spreading sequence, and calculating a pilot amplitude of the pilot channel based on the de-spread CDMA signal;
- and
- estimating, based on the received CDMA signal and the pilot amplitude, the transmission power of the base station and the noise level of the noise, by estimating one or more channel taps of a channel response of the communication channel, and normalizing the channel response by the pilot amplitude by dividing the channel taps by the pilot amplitude.
1 more element
A method, comprising:
- in a communication terminal, receiving a Code-Division Multiple Access (CDMA) signal that was transmitted over a communication channel by a base station at a given transmission power and received at the communication terminal with noise of a given noise level, wherein the CDMA signal comprises at least a pilot channel that was spread using a pilot spreading sequence;
- de-spreading the received CDMA signal with the pilot spreading sequence by deriving multiple Interference-and-Noise (IAN) components, each corresponding to a de-spreading of a respective different segment of the received CDMA signal with the pilot spreading sequence;
- calculating a pilot amplitude of the pilot channel by calculating statistical attributes of the IAN components;
- and
- estimating, based on the received CDMA signal and the pilot amplitude, the transmission power of the base station and the noise level of the noise.
2 more elements
Apparatus, comprising:
- a receiver, which is configured to receive a Code-Division Multiple Access (CDMA) signal that was transmitted over a communication channel by a base station at a given transmission power and received at a communication terminal with noise of a given noise level, wherein the CDMA signal comprises at least a pilot channel that was spread using a pilot spreading sequence;
- and
- processing circuitry, which is configured to de-spread the received CDMA signal with the pilot spreading sequence, to calculate a pilot amplitude of the pilot channel based on the de-spread CDMA signal, and to estimate, based on the received CDMA signal and the pilot amplitude, the transmission power of the base station and the noise level of the noise, by estimating one or more channel taps of a channel response of the communication channel, and normalizing the channel response by the pilot amplitude by dividing the channel taps by the pilot amplitude.
Apparatus, comprising:
- a receiver, which is configured to receive a Code-Division Multiple Access (CDMA) signal that was transmitted over a communication channel by a base station at a given transmission power and received at a communication terminal with noise of a given noise level, wherein the CDMA signal comprises at least a pilot channel that was spread using a pilot spreading sequence;
- and
- processing circuitry, which is configured to de-spread the received CDMA signal with the pilot spreading sequence by deriving multiple Interference-and-Noise (IAN) components, each corresponding to a de-spreading of a respective different segment of the received CDMA signal with the pilot spreading sequence, to calculate a pilot amplitude of the pilot channel by calculating statistical attributes of the IAN components, and to estimate, based on the received CDMA signal and the pilot amplitude, the transmission power of the base station and the noise level of the noise.
Dependencies are inferred from the claim text.