Methods and apparatus for noise estimation of communication terminals
AssigneeSpreadtrum Communications (Shanghai) Co., Ltd.
InventorsXuqiang Shen, Xiaojian Dong
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Abstract
Methods and communication terminals for estimating noise in a multicarrier communication system, where multicarrier symbols are received that include pilot signals, channel properties are estimated based on the received multicarrier symbols, wherein the channel properties include channel properties of a subcarrier carrying one of the pilot signals, and the channel properties of the subcarrier carrying one of the pilot signals are mixed with the corresponding pilot signal to calculate a noise power for the corresponding subcarrier.
Claims41
A method in a communication terminal for estimating noise in a multicarrier communication system, wherein communication in the multicarrier communication system is carried out over a plurality of subcarriers, comprising:
- receiving multicarrier symbols, the multicarrier symbols including pilot signals;
- estimating channel properties based on the received multicarrier symbols, wherein the channel properties include channel properties of a subcarrier carrying one of the pilot signals;
- and
- mixing the channel properties of the subcarrier carrying one of the pilot signals with a corresponding pilot signal to calculate a noise power for a corresponding subcarrier, wherein
- the mixing comprises a conjugate complex multiplication operation,
- the mixing comprises calculating the noise power by computing an absolute value of an imaginary part of a result from the conjugate complex multiplication;
- and
- the mixing comprises calculating a signal power of the corresponding subcarrier by computing an absolute value of a real part of the result from the conjugate complex multiplication.
A communication terminal in a multicarrier communication system, wherein communication in the multicarrier communication system is carried out over a plurality of subcarriers, comprising:
- a receiver receiving multicarrier symbols, the multicarrier symbols including pilot signals;
- an estimator coupled to receive the multicarrier symbols and to estimate channel properties based thereon, wherein the channel properties include channel properties of a subcarrier carrying one of the pilot signals;
- and
- a mixer coupled to mix the estimated channel properties of the subcarrier carrying one of the pilot signals with a corresponding pilot signal to calculate a noise power for a corresponding subcarrier, wherein
- the mixer performs a conjugate complex multiplication on the channel properties of the subcarrier carrying one of the pilot signals and the corresponding one of the pilot signals,
- the mixer calculates the noise power by computing an absolute value of an imaginary part of a result from the conjugate complex multiplication, and
- the mixer calculates a signal power of the corresponding subcarrier by computing an absolute value of a real part of a result from the conjugate complex multiplication.
Dependencies are inferred from the claim text.