US6901243B2
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US
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Method and apparatus for mitigating adjacent channel interference in a wireless communication system
Assignee: Qualcomm Inc
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Filing: 2001-11-08
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Granted: 2005-05-31
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Expires: 2021-11-08
Abstract
Abstract Techniques for detecting and mitigating adjacent channel interference (ACI) in a wireless (e.g., CDMA) communication system. In one aspect, ACI may be determined by signaling or detected by filtering a pre-processed signal in each frequency range where ACI may be present (e.g., with a respective bandpass filter), estimating the energy of the filtered signal for each frequency range, comparing the estimated energy against an ACI threshold, and indicating the presence or absence of ACI at each frequency range based on the result of the comparison. In another aspect, a selectable filter (e.g., a FIR filter) having a number of possible filter responses (e.g., provided by a number of sets of filter coefficients) may be used to provide filtering for the pre-processed signal and to reject any detected ACI. One of the possible filter responses is selected for use depending on whether and where ACI has been detected.
Inventors
- 👤 Srikant Jayaraman
- 👤 John E. Smee
- 👤 Ivan Jesus Fernandez Corbaton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:26
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/69; H04B1/707; H04B1/7097; H04B1/711; H04B1/7115; H04B1/06; H04B1/10; H04B1/1027; H04B1/1036
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
98 words
A method for mitigating adjacent channel interference (ACI) in a wireless communication system, comprising: determining a presence or absence of ACI in each of one or more frequency ranges in a pre-processed signal comprised of a desired signal component, wherein the presence or absence of ACI in the pre-processed signal is determined via signaling from a transmitter; selecting a particular filter response from among a plurality of possible filter responses based on the determined presence or absence of ACI in each of the one or more frequency ranges; and filtering the pre-processed signal with the selected filter response.
Claim 2
Independent Claim
98 words
A method for mitigating adjacent channel interference (ACI) in a wireless communication system, comprising: determining a presence or absence of ACI in each of one or more frequency ranges in a pre-processed signal comprised of a desired signal component, wherein the presence or absence of ACI in the pre-processed signal is determined via signaling from a transmitter; selecting a particular filter response from among a plurality of possible filter responses based on the determined presence or absence of ACI in each of the one or more frequency ranges; and filtering the pre-processed signal with the selected filter response.
Claim 3
Dependent Claim
23 words
The method of claim 1 , wherein the plurality of possible filter responses are provided by a plurality of sets of filter coefficients.
Claim 4
Dependent Claim
22 words
The method of claim 2 , wherein the plurality of sets of filter coefficients are for a finite impulse response (FIR) filter.
Claim 5
Dependent Claim
37 words
The method of claim 1 , wherein the plurality of possible filter responses include a first filter response selected for use if ACI is determined to be present at an upper band-edge of the desired signal component.
Claim 6
Dependent Claim
37 words
The method of claim 1 , wherein the plurality of possible filter responses include a second filter response selected for use if ACI is determined to be present at a lower band-edge of the desired signal component.
Claim 7
Dependent Claim
42 words
The method of claim 1 , wherein the plurality of possible filter responses include a third filter response selected for use if ACI is determined to be present at both an upper band-edge and a lower band-edge of the desired signal component.
Claim 8
Dependent Claim
32 words
The method of claim 1 , wherein the plurality of possible filter responses include a fourth filter response selected for use if ACI is determined to be absent from the pre-processed signal.
Claim 9
Dependent Claim
34 words
The method of claim 1 , wherein each of the plurality of possible filter responses is derived to maximize signal-to-noise-and-interference ratio (SINR) based on a respective hypothesis for the ACI in the pre-processed signal.
Claim 10
Dependent Claim
25 words
The method of claim 8 , wherein each hypothesis is indicative of a hypothesized location and spectral profile for the ACI in the pre-processed signal.
Claim 11
Dependent Claim
102 words
A receiver apparatus in a wireless communication system, comprising: means for pre-processing a received signal comprised of a desired signal component; means for determining a presence or absence of adjacent channel interference (ACI) in the pre-processed signal in each of one or more frequency ranges, wherein the presence or absence of ACI in the pre-processed signal is determined via signaling from a transmitter; and means for filtering the pre-processed signal with a particular filter response selected from among a plurality of possible filter responses based on the determined presence or absence of ACI in each of the one or more frequency ranges.
Claim 12
Dependent Claim
102 words
A receiver apparatus in a wireless communication system, comprising: means for pre-processing a received signal comprised of a desired signal component; means for determining a presence or absence of adjacent channel interference (ACI) in the pre-processed signal in each of one or more frequency ranges, wherein the presence or absence of ACI in the pre-processed signal is determined via signaling from a transmitter; and means for filtering the pre-processed signal with a particular filter response selected from among a plurality of possible filter responses based on the determined presence or absence of ACI in each of the one or more frequency ranges.
Claim 13
Dependent Claim
30 words
The method of claim 10 , wherein the presence or absence of ACI in the pre-processed signal on a given CDMA channel is determined via signaling from a base station.
Claim 14
Dependent Claim
35 words
The method of claim 11 , wherein the presence or absence of ACI in the pre-processed signal on a sync channel is determined via a broadcast message on the sync channel from a base station.
Claim 15
Dependent Claim
33 words
The method of claim 11 , wherein the presence or absence of ACI in the pre-processed signal on a given CDMA channel is determined via messaging from a base station during system configuration.
Claim 16
Dependent Claim
30 words
The method of claim 1 , wherein the presence or absence of ACI in the pre-processed signal on a given CDMA channel is determined via signaling from a base station.
Claim 17
Dependent Claim
35 words
The method of claim 14 , wherein the presence or absence of ACI in the pre-processed signal on a sync channel is determined via a broadcast message on the sync channel from a base station.
Claim 18
Dependent Claim
33 words
The method of claim 14 , wherein the presence or absence of ACI in the pre-processed signal on a given CDMA channel is determined via from a base station messaging during system configuration.
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