System and method for mitigating co-channel interference in white space modems using interference aware techniques
First Claim
1. A system for mitigating co-channel interference (CCI) caused due to narrow multiband signal in white space (WS) modems, comprising:
- a base-station that comprises;
a base-station receiver that receives an orthogonal frequency division multiplexing (OFDM) signal from one or more customer premises equipment (CPE) transmitters, wherein said base-station receiver comprises;
an interference detection module that detects a presence of said co-channel interference (CCI) in carriers of said OFDM signal and determines co-channel interference affected carriers by identifying central interference carriers corresponding to said co-channel interference affected carriers, wherein said co-channel interference is represented in said carriers using at least one of (i) a position, (ii) a spread or (iii) an interference power, of said co-channel interference affected carriers; and
a dynamic notch filter module that (i) receives said central interference carriers from said interference detection module and (ii) mitigates said co-channel interference of said co-channel interference affected carriers without affecting frame detection capability of said system by suppressing said interference power of said co-channel interference affected carriers;
an interference aware signal to noise ratio (SNR) estimation module that determines an average signal to noise ratio (SNR) of (i) interference unaffected carriers and (ii) said co-channel interference affected carriers; and
an interference aware de-mapper module that processes said average signal to noise ratio of (i) said interference unaffected carriers and (ii) said co-channel interference affected carriers to perform optimal interference aware de-mapping of said co-channel interference affected carriers, wherein said optimal interference aware de-mapping is performed to overcome saturation of data affected by the co-channel interference while using a Log Likelihood Ratio (LLR) based de-mapping and thus minimizing the possibility of errors in a channel decoding processor module; and
a base-station transmitter that comprises an interference aware mapper module that performs interference aware allocation at higher layers of said base-station transmitter to reject said co-channel interference affected carriers from data allocation to achieve required bit error rate (BER) in said WS modems.
1 Assignment
0 Petitions
Accused Products
Abstract
Disclosed is a system for mitigating co-channel interference (CCI) in white space (WS) modems. The system includes a base-station that includes a base-station transmitter and a base-station receiver. The base-station receiver receives an OFDM signal from one or more CPE transmitters. An interference detection module detects presence of co-channel interference in carriers of the OFDM signal and determines co-channel interference affected carriers. A dynamic notch filter module (i) receives central interference carriers from interference detection module and (ii) mitigates the co-channel interference of co-channel interference affected carriers without affecting frame detection capability of the system. An interference aware signal to noise ratio (SNR) estimation module determines an average signal to noise ratio (SNR) of (i) interference unaffected carriers and (ii) co-channel interference affected carriers. An interference aware de-mapper module processes average signal to noise ratio of (i) interference unaffected carriers and (ii) co-channel interference affected carriers.
-
Citations
23 Claims
-
1. A system for mitigating co-channel interference (CCI) caused due to narrow multiband signal in white space (WS) modems, comprising:
a base-station that comprises; a base-station receiver that receives an orthogonal frequency division multiplexing (OFDM) signal from one or more customer premises equipment (CPE) transmitters, wherein said base-station receiver comprises; an interference detection module that detects a presence of said co-channel interference (CCI) in carriers of said OFDM signal and determines co-channel interference affected carriers by identifying central interference carriers corresponding to said co-channel interference affected carriers, wherein said co-channel interference is represented in said carriers using at least one of (i) a position, (ii) a spread or (iii) an interference power, of said co-channel interference affected carriers; and a dynamic notch filter module that (i) receives said central interference carriers from said interference detection module and (ii) mitigates said co-channel interference of said co-channel interference affected carriers without affecting frame detection capability of said system by suppressing said interference power of said co-channel interference affected carriers; an interference aware signal to noise ratio (SNR) estimation module that determines an average signal to noise ratio (SNR) of (i) interference unaffected carriers and (ii) said co-channel interference affected carriers; and an interference aware de-mapper module that processes said average signal to noise ratio of (i) said interference unaffected carriers and (ii) said co-channel interference affected carriers to perform optimal interference aware de-mapping of said co-channel interference affected carriers, wherein said optimal interference aware de-mapping is performed to overcome saturation of data affected by the co-channel interference while using a Log Likelihood Ratio (LLR) based de-mapping and thus minimizing the possibility of errors in a channel decoding processor module; and a base-station transmitter that comprises an interference aware mapper module that performs interference aware allocation at higher layers of said base-station transmitter to reject said co-channel interference affected carriers from data allocation to achieve required bit error rate (BER) in said WS modems. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
12. A system for mitigating co-channel interference (CCI) caused due to narrow multiband signal in white space (WS) modems, comprising:
a customer premises equipment (CPE) that comprises; one or more CPE receivers that receive an orthogonal frequency division multiplexing (OFDM) signal from a base-station transmitter, wherein said one or more CPE receivers comprise; an interference detection module that detects a presence of said co-channel interference (CCI) in carriers of said OFDM signal and determines co-channel interference affected carriers by identifying central interference carriers corresponding to said co-channel interference affected carriers, wherein said co-channel interference is represented in said carriers using at least one of (i) a position, (ii) a spread or (iii) an interference power, of said co-channel interference affected carriers; and a dynamic notch filter module that (i) receives said central interference carriers from said interference detection module and (ii) mitigates said co-channel interference of said co-channel interference affected carriers without affecting frame detection capability of said system by suppressing said interference power of said co-channel interference affected carriers; an interference aware signal to noise ratio (SNR) estimation module that determines an average signal to noise ratio (SNR) of (i) interference unaffected carriers and (ii) said co-channel interference affected carriers; an interference aware de-mapper module that processes said average signal to noise ratio of (i) said interference unaffected carriers and (ii) said co-channel interference affected carriers to perform optimal interference aware de-mapping of said co-channel interference affected carriers, wherein said optimal interference aware de-mapping is performed to overcome saturation of data affected by the co-channel interference while using a Log Likelihood Ratio (LLR) based de-mapping and thus minimizing the possibility of errors in a channel decoding processor module; and one or more CPE transmitters that comprise an interference aware mapper module that performs interference aware allocation at higher layers of said one or more CPE transmitters to reject said co-channel interference affected carriers from data allocation to achieve required bit error rate (BER) in said WS modems. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
-
21. A method for mitigating co-channel interference (CCI) caused due to narrow multiband signal in white space (WS) modems, comprising:
-
receiving an orthogonal frequency division multiplexing (OFDM) signal from at least one of (a) one or more customer premises equipment (CPE) uplink transmitters or (b) a base-station downlink transmitter; detecting, using an interference detection module, a presence of said co-channel interference (CCI) in carriers of said OFDM signal and determining co-channel interference affected carriers, comprising; identifying central interference carriers corresponding to said co-channel interference affected carriers, wherein said co-channel interference is represented in said carriers using at least one of (i) a position, (ii) a spread or (iii) an interference power, of said co-channel interference affected carriers; receiving, using a dynamic notch filter module, said central interference carriers from said interference detection module; mitigating, using said dynamic notch filter module, said co-channel interference of said co-channel interference affected carriers without affecting frame detection capability of a system, wherein said mitigating comprises suppressing said interference power of said co-channel interference affected carriers; determining, using an interference aware signal to noise ratio (SNR) estimation module, an average signal to noise ratio (SNR) of (i) interference unaffected carriers and (ii) said co-channel interference affected carriers; processing, using an interference aware de-mapper module, said average signal to noise ratio of (i) said interference unaffected carriers and (ii) said co-channel interference affected carriers to perform optimal interference aware de-mapping of said co-channel interference affected carriers, wherein said optimal interference aware de-mapping is performed to overcome saturation of data affected by the co-channel interference while using a Log Likelihood Ratio (LLR) based de-mapping and thus minimizing the possibility of errors in a channel decoding processor module; and performing, using an interference aware mapper module, interference aware allocation at higher layers of at least one of (a) said one or more CPE uplink transmitters or (b) said base-station downlink transmitter to reject said co-channel interference affected carriers from data allocation to achieve required bit error rate (BER) in said WS modems. - View Dependent Claims (22, 23)
-
Specification