A p-order metric uwb receiver structure with improved performance in multiple access interference-plus-noise multipath channels
AssigneeThe Governors of the University of Alberta
InventorsNorman C. Beaulieu, Hua Shao
Life of this patent
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Abstract
A UWB receiver dubbed the “p-order metric” receiver (p-omr) is proposed to detect the time-hopping ultra-wide bandwidth signal in multiple access interference channels. The receiver acquires a signal over a wireless channel, adaptively selects a shaping parameter, p, over time and generates a first set of partial statistics by, for each of a plurality N of observations per symbol, using the shaping parameter to modify the exponential order of the approximation of the noise plus multiple access interference probability density function, f(x), used in the receiver model.
Claims25
A method of receiving a signal comprising:
- receiving a signal over a wireless channel;
- adaptively selecting a shaping parameter p over time;
- generating a first set of partial statistics by, for each of a plurality N of observations per symbol, using a receiver model based on an assumption that the noise plus MAI has a PDF
- f(x)=c·exp{−γ|x−Sm|p}
- where p is the shaping parameter, Sm is the mean, and parameter γ is used to adjust the second moment of the RV, and c is a constant to ensure that
- ∫
- -
- ∞
- +
- ∞
-
- f
-
- (
- x
- )
-
-
- x
- =
- 1
- to generate a respective partial decision statistic of the first set of partial statistics;
- summing the partial decision statistics to produce a first sum;
- making a decision on a symbol contained in the signal based on the first sum;
- outputting the decision.
A receiver comprising:
- a correlator configured to generate a first set of partial statistics by, for each of a plurality N of observations per symbol, using a receiver model based on an assumption that the noise plus MAI has a PDF
- f(x)=c·exp{−γ|x−Sm|p}
- where p is a shaping parameter, Sm is the mean, and parameter γ is used to adjust the second moment of the RV, and c is a constant to ensure that
- ∫
- -
- ∞
- +
- ∞
-
- f
-
- (
- x
- )
-
-
- x
- =
- 1
- to generate a respective partial decision statistic of the first set of partial statistics;
- a channel estimator configured to adapt the shaping parameter over time;
- an accumulator configured to sum the partial decision statistics to produce a first SUM;
- a decision block configured to make a decision on a symbol contained in the signal based on the first sum;
- an output for outputting the decision.
A method of receiving a signal using a rake receiver, the method comprising:
- receiving a signal over a wireless channel;
- adaptively selecting a shaping parameter p over time;
- generating a first set of partial statistics by, for each of a plurality N of observations per symbol, using a receiver model based on an assumption that the noise plus MAI has a PDF
- f(x)=c·exp{−γ|x−Sm|p}
- where p is the shaping parameter, Sm is the mean, and parameter γ is used to adjust the second moment of the RV, and c is a constant to ensure that
- ∫
- -
- ∞
- +
- ∞
-
- f
-
- (
- x
- )
-
-
- x
- =
- 1
- to generate a respective partial decision statistic of the first set of partial statistics;
- generating a respective set of partial statistics for each of a plurality of multi-path components of the received signal, one of the sets of partial statistics being said first set of partial statistics, by for each of a plurality N of observations per symbol, using a receiver model based on an assumption that the noise plus MAI has a PDF
- f(x)=c·exp{−γ|x−Sm|p}
- where p is the shaping parameter, Sm is the mean, and parameter γ is used to adjust the second moment of the RV, and c is a constant to ensure that
- ∫
- -
- ∞
- +
- ∞
-
- f
-
- (
- x
- )
-
-
- x
- =
- 1
- to generate a respective partial decision statistic;
- combining the partial decision statistics to produce an overall decision statistic;
- wherein making a decision on a symbol contained in the signal based on the sum comprises making a decision based on the overall decision statistic.
Dependencies are inferred from the claim text.