Signal quality estimation for ofdma systems
AssigneeQUALCOMM Incorporated
InventorsJong Hyeon Park, Je Woo Kim
Life of this patent
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Abstract
Certain embodiments utilize raw signals to estimate channel quality, as contrasted to utilizing equalized signals or after channel estimation. For example, signal quality may be estimated by calculating powers of pilot sub-carriers and null sub-carriers of the raw signals. To mitigate channel effect, certain embodiments utilize first and/or second order differentiation schemes.
Claims31
A method for performing signal quality calculations in a communication device, comprising:
- transforming, into a frequency domain, raw preamble signals received from a station;
- extracting first pilot sub-carrier signals corresponding to a first preamble segment from the transformed preamble signals;
- performing N-order differential operations on the first pilot sub-carrier signals to generate differential pilot signals, wherein N is an integer greater than 1;
- taking separate power measurements for the first pilot sub-carrier signals and the differential pilot signals;
- calculating one or more signal quality parameters using the separate power measurements for the first pilot sub-carrier signals and the differential pilot signals;
- and
- transmitting the signal quality parameters to the station.
A receiver for performing signal quality calculations in a communication device, comprising:
- transform logic for transforming, into a frequency domain, raw preamble signals received from a station and extracting first pilot sub-carrier signals corresponding to a first preamble segment from the transformed preamble signals;
- differential logic for performing N-order differential operations on the first pilot sub-carrier signals to generate differential pilot signals, wherein N is an integer greater than 1;
- measurement logic for taking separate power measurements for the first pilot sub-carrier signals and the differential pilot signals;
- and
- signal quality logic for calculating one or more signal quality parameters using the separate power measurements for the first pilot sub-carrier signals and the differential pilot signals.
An apparatus for performing signal quality calculations in a communication device, comprising:
- means for transforming, into a frequency domain, raw preamble signals received from a station;
- means for extracting first pilot sub-carrier signals corresponding to a first preamble segment from the transformed preamble signals;
- means for performing N-order differential operations on the first pilot sub-carrier signals to generate differential pilot signals, wherein N is an integer greater than 1;
- means for taking separate power measurements for the first pilot sub-carrier signals and the differential pilot signals;
- means for calculating one or more signal quality parameters using the separate power measurements for the first pilot sub-carrier signals and the differential pilot signals;
- and
- means for transmitting the signal quality parameters to the station.
A mobile device, comprising:
- a receiver for transforming, into a frequency domain, raw preamble signals received from a station and extracting first pilot sub-carrier signals corresponding to a first preamble segment from the transformed preamble signals;
- measuring logic for performing N-order differential operations on the first pilot sub-carrier signals to generate differential pilot signals, wherein N is an integer greater than 1, taking separate power measurements for the first pilot sub-carrier signals and the differential pilot signals, and calculating one or more signal quality parameters using the separate power measurements for the first pilot sub-carrier signals and the differential pilot signals;
- and
- a transmitter for transmitting the signal quality parameters to the station.
A computer-program product for performing signal quality calculations in a communication system comprising a computer readable medium having a set of instructions stored thereon, the set of instructions being executable by one or more processors and the set of instructions comprising:
- instructions for transforming, into a frequency domain, raw preamble signals received from a station;
- instructions for extracting first pilot sub-carrier signals corresponding to a first preamble segment from the transformed preamble signals;
- instructions for performing N-order differential operations on the first pilot sub-carrier signals to generate differential pilot signals, wherein N is an integer greater than 1;
- instructions for taking separate power measurements for the first pilot sub-carrier signals and the differential pilot signals;
- instructions for calculating one or more signal quality parameters using the separate power measurements for the first pilot sub-carrier signals and the differential pilot signals;
- and
- instructions for transmitting the signal quality parameters to the station.
Dependencies are inferred from the claim text.