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1. (WO2007003297) METHOD AND APPARATUS FOR REDUCING THE INTERFERENCES BETWEEN A WIDE BAND DEVICE AND A NARROW BAND INTERFERER
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CLAIMS

1. Method for reducing the interferences between a main device (MDVC) adapted to transmit information on sub-carriers having frequencies belonging to a main band of frequencies, said information being issued from symbols obtained by a mapping of a punctured stream of bits according to a modulation mapping scheme, and at least one auxiliary device (XDVC) adapted to emit and/or receive information within an auxiliary band of frequencies, said auxiliary band being narrower than said main band and included within said main band, said method comprising a main interference reduction mode (MIRM) for reducing the interference generated by said main device towards said auxiliary device, said main interference reduction mode (MIRM) being performed within said main device and including detecting (40) an emission from and/or a reception performed by said auxiliary device, determining (41 ) from said detection step a group of at least one sub-carrier having frequencies interfering with said auxiliary band of frequencies, determining (42) the bits of said punctured stream which correspond to the information carried by said interfering sub-carriers of said group and processing (43) said determined bits such that said processed bits are mapped into a reference symbol having an amplitude equal or close to zero.
2. Method according to claim 1 , wherein said reference symbol is chosen within a group of several reference symbols having respectively different amplitudes, each amplitude being equal or close to zero.
3. Method according to any one of the preceding claims, wherein said processing step (43) of said determined bits comprises associating (70) a control indication to each determined bits, and wherein bits associated with said control indication are mapped into said reference symbol.

4. Method according to claim 3 , wherein said processing step comprises associating (70,71 ) a control bit (cbt) to each bit of said punctured stream, said control bit (cbt) having a first logical value corresponding to said control indication, or a second logical value, the bits associated with said control bits having said second logical value being mapped (73) into their corresponding symbols in accordance with said modulation mapping scheme.
5. Method according to any one of the preceding claims, wherein said main device is also adapted to receive information carried by said sub-carriers and to perform a reception processing including determining received symbols from the received information and a demapping of said received symbols for providing a punctured stream of soft bits, each soft bit having a sign representative of the estimation of logical value of the corresponding bit and a magnitude representative of the confidence in said estimation, said method further comprising an auxiliary interference reduction mode (XIRM) for reducing the interference generated by said auxiliary device towards said main device, said auxiliary interference reduction mode being performed within said main device and including replacing (93) the soft bits corresponding to the information received on said interfering sub-carriers by neutral soft bits having a magnitude equal to zero.
6. Method according to any one of the preceding claims, wherein said detecting step (40) of the main interference reduction mode comprises analysing (51 ) a channel state information and detecting the operation of said at least one auxiliary device from said channel state information.
7. Method according to claim 6, wherein said detecting step (40) further comprises checking (52) said operation detection by using a set of stored interference information respectively associated to a set of several different auxiliary devices.

8. Method according to any one of the preceding claims, wherein said main interference reduction mode comprises regularly checking (61 ) the operation of said auxiliary device and if said auxiliary device is no more detectable, said main interference reduction mode concerning said no more detectable auxiliary device is stopped (63).
9. Method according to any one of claims 1 to 5, wherein said main device (MDVC) and said at least one auxiliary device (XDVC) are all together incorporated within a single wireless communication apparatus.
10. Method according to claim 9, wherein an indication of said group of at least one sub-carrier having frequencies interfering with said auxiliary band of frequencies of said auxiliary device is stored within said apparatus and said detecting step of the main interference reduction mode comprises receiving from said auxiliary device an auxiliary control information (XCLT) representative of the operation or of the non operation of said auxiliary device such that said main interference reduction mode is performed only during the operation of said auxiliary device.
1 1. Method according to any one of the preceding claims, wherein several different auxiliary devices are respectively adapted to emit and/or receive information within several different auxiliary bands of frequencies, each auxiliary band being narrower than said main band and included within said main band, and wherein said main interference reduction mode is performed for at least some of said several different auxiliary devices.
12. Method according to any one of the preceding claims, further comprising an additional interference reduction mode (ADIRM) for reducing the interference between said main device and said at least one auxiliary device, said additional interference reduction mode being performed within said main device and including detecting (130) an emission from and/or a reception performed by said at least one auxiliary device, determining ( 131 ) from said detection step a group of at least one sub-carrier having frequencies interfering with said auxiliary band of frequencies, and shifting (132) at least a part of said main band of frequencies including said group with a chosen frequency shift.
13. Method according to claim 12, wherein the frequency shift is at least equal to the width of the frequency band of said at least one auxiliary device.
14. Method according to claim 12 or 13, wherein the main band of frequencies is subdivided into several different mutually spaced sub-bands, and the shifting step comprises shifting (140) at least the sub-band which contains at least a part of said group of interfering sub-carriers.
15. Method according to any one of claims 12 to 14, wherein said detecting step of the additional interference reduction mode comprises analysing a channel state information and detecting the operation of said at least one auxiliary device from said channel state information.
16. Method according to claim 15, wherein said detecting step further comprises checking said operation detection by using a set of stored interference information respectively associated to a set of several different auxiliary devices.
17. Method according to any one of the claims 12 to 16, wherein said additional interference reduction mode comprises regularly checking the operation of said auxiliary device and if said auxiliary device is no more detectable, said additional interference reduction mode concerning said no more detectable auxiliary device is stopped.
18. Method according to any one of claims 12 to 14, wherein said main device (MDVC) and said at least one auxiliary device (XDVC) are all together incorporated within a single wireless communication apparatus.
19. Method according to claim 18, wherein an indication of said group of at least one sub-carrier having frequencies interfering with said auxiliary band of frequencies of said auxiliary device is stored within said apparatus and said detecting step of the additional interference reduction mode comprises receiving from said auxiliary device an additional control information representative of the operation or of the non operation of said auxiliary device such that said additional interference reduction mode is performed only during the operation of said auxiliary device.
20. Method according to any one of claims 12 to 19, wherein both main interference reduction mode and additional interference reduction mode are performed for a same auxiliary device.
21. Method according to any one of claims 12 to 19, wherein main interference reduction mode and additional interference reduction mode are respectively performed for different auxiliary devices.
22. Method according to any one of the preceding claims, wherein the main device belongs to a multi-carrier based Ultra Wide Band communication system.
23. Method according to claim 22, wherein the main device belongs to an OFDM based Ultra Wide Band communication system.
24. Method according to any one of the preceding claims, wherein said at least one auxiliary device belongs to a fix wireless access system like a WIMAX system or to a mobile radio system defined by a mobile radio standard, like for example GSM, UMTS, CDMA, EDGE.
25. Method according to claims 1 to 24, wherein said at least one auxiliary device belongs to a fix satellite service system.

26. Wireless communication apparatus, comprising a main device (MDVC) having a main transmission chain (TXCH) including puncturing means (PM) for delivering a punctured stream of bits, mapping means (MPM) for delivering symbols from said punctured stream of bits in accordance with a modulation scheme, a transmission stage (INTX, RF) for transmitting information issued from said symbols on sub-carriers having frequencies belonging to a main band of frequencies, and main interference reduction means (MIFRM) for reducing the interference generated by said main device towards at least one auxiliary device adapted to emit and/or receive information within an auxiliary band of frequencies, said auxiliary band being narrower than said main band and included within said main band, said main interference reduction means (MIFRM) including main detection means (DTM) for detecting an emission from and/or a reception performed by said auxiliary device, a main control unit (MCU) connected to the detection means for determining a group of at least one sub-carrier having frequencies interfering with said auxiliary band of frequencies and determining the bits of said punctured stream which correspond to the information carried by said interfering sub-carriers of said group and a main processing unit (MPU) for processing said determined bits such that said mapping means are adapted to map said processed bits into a reference symbol having an amplitude equal or close to zero.
27. Apparatus according to claim 26, wherein said reference symbol is chosen within a group of several reference symbols having respectively different amplitudes, each amplitude being equal or close to zero.
28. Apparatus according to claim 26 or 27, wherein said main processing unit (MPU) is adapted to associate a control indication to each determined bits, and wherein said mapping means (MPM) are adapted to map the bits associated with said control indication into said reference symbol.
29. Apparatus according to claim 28, wherein said main processing unit (MPU) is adapted to associate a control bit (cbt) to each bit of said punctured stream, said control bit having a first logical value corresponding to said control indication, or a second logical value, and wherein the mapping means (MPM) are adapted to map the bits associated with said control bits having said second logical value into their corresponding symbols in accordance with said modulation scheme. 30. Apparatus according to any one of claims 26 to 29, wherein said main device (MDVC) further comprises a reception chain (RXCH) including a receiving stage (RF, DOFM) for receiving information carried by said sub-carriers and delivering received symbols from said received information, demapping means (DMPM) for demapping the received symbols according to said modulation scheme and delivering a punctured stream of soft bits, each soft bit having a sign representative of the estimation of logical value of the corresponding bit and a magnitude representative of the confidence in said estimation, said main device further comprising auxiliary interference reduction means (AUXIFRM) for reducing the interference generated by said auxiliary device towards said main device, said auxiliary interference reduction means including an auxiliary processing unit (XCU) for replacing the soft bits corresponding to the information received on said interfering sub-carriers by neutral soft bits having a magnitude equal to zero.
31. Apparatus according to any one claims 26 to 30, further comprising a channel estimation unit (CHST) adapted to deliver a channel state information, wherein said main detection means (DTM) comprises main (AM) analysing means for analysing said channel state information and detecting the operation of said at least one auxiliary device from said channel state information.
32. Apparatus according to claim 31 , further comprising main memory means (MM) for storing a set of interference information respectively associated to a set of several different auxiliary devices, and main checking means (MCKM) for checking said operation detection by using said stored set of interference information.
33. Apparatus according to any one of claims 26 to 32, further comprising a main management unit (MMU) adapted to manage the operation of said main interference reduction means, wherein said main interference reduction means are further adapted to regularly check the operation of said auxiliary device and if said auxiliary device is no more detectable said main management unit (MMU) is adapted to stop the interference reduction concerning said no more detectable auxiliary device.
34. Apparatus according to any one of claims 26 to 30, incorporating said main device (MDVC) and said at least one auxiliary device (XDVC) all together.
35. Apparatus according to claim 34, further comprising a main management unit (MMU) adapted to manage the operation of said main interference reduction means and auxiliary memory means for storing an indication of said group of at least one sub-carrier having frequencies interfering with said auxiliary band of frequencies of said auxiliary device, wherein said auxiliary device comprises auxiliary control means (MAC) for delivering an auxiliary control information representative of the operation or of the non operation of said auxiliary device such that said main management unit is adapted to allow the operation of said main interference reduction means only during the operation of said auxiliary device.

36. Apparatus according to any one of claims 26 to 35, wherein several different auxiliary devices are respectively adapted to emit and/or transmit information within several different auxiliary bands of frequencies, each auxiliary band being narrower than said main band and included within said main band, and wherein said main interference reduction means are adapted to reduce the interference generated by said main device towards at least some of said several different auxiliary devices.
37. Apparatus according to any one of claims 26 to 36, further comprising additional interference reduction means (ADIFRM) for reducing the interference between said main device and said at least one auxiliary device, said additional interference reduction means including additional detecting means (ADTM) for detecting an emission from and/or a reception performed by said at least one auxiliary device, an additional control unit (ADCV) connected to said additional detecting means for determining a group of at least one sub-carrier having frequencies interfering with said auxiliary band of frequencies, and for shifting at least a part of said main band of frequencies including said group with a chosen frequency shift.
38. Apparatus according to claim 37, wherein the frequency shift is at least equal to the width of the frequency band of said at least one auxiliary device.
39. Apparatus according to claim 37 or 38, wherein the main band of frequencies is subdivided into several different mutually spaced sub-bands, and the additional control unit(ADCU) is adapted to shift at least the sub-band which contains at least a part of said group of interfering sub-carriers.
40. Apparatus according to any one of claims 37 to 39, further comprising a channel estimation unit (CHST) adapted to deliver a channel state information, wherein said additional detection means (ADTM) comprises additional analysing means (ADAM) for analysing said channel state information and detecting the operation of said at least one auxiliary device from said channel state information.
41. Apparatus according to claim 40, further comprising additional memory means (ADMM) for storing a set of interference information respectively associated to a set of several different auxiliary devices, and additional checking means (ADCKM) for checking said operation detection by using said stored set of interference information.

42. Apparatus according to any one of the claims 37 to 41 , further comprising an additional management unit (ADMU) adapted to manage the operation of said additional interference reduction means, wherein said additional interference reduction means are further adapted to regularly check the operation of said auxiliary device and if said auxiliary device is no more detectable said additional management unit is adapted to stop the interference reduction concerning said no more detectable auxiliary device.
43. Apparatus according to any one of claims 37 to 42, wherein said main device (MDVC) and said at least one auxiliary device (XDVC) are all together incorporated within a single wireless communication apparatus.
44. Apparatus according to claim 43, comprising an additional management unit (ADMU) adapted to manage the operation of said additional interference reduction means and additional memory means for storing an indication of said group of at least one sub-carrier having frequencies interfering with said auxiliary band of frequencies of said auxiliary device, wherein said auxiliary device comprises auxiliary control means (MAC) for delivering an auxiliary control information representative of the operation or of the non operation of said auxiliary device such that said additional management unit (ADMU) is adapted to allow the operation of said main interference reduction means only during the operation of said auxiliary device.
45. Apparatus according to any one of claims 37 to 44, wherein both said main interference reduction means and additional interference reduction means are adapted to perform their respective interference reduction for a same auxiliary device.
46. Apparatus according to any one of claims 37 to 44, wherein said main interference reduction means and additional interference reduction means are adapted to perform their respective interference reduction for different auxiliary devices.
47. Apparatus according to any one of claims 37 to 46, wherein both main and additional detecting means are identical, both main and additional control unit are identical.
48. Apparatus according to any one of claims 26 to 47, wherein the main device (MDVC) belongs to a multi-carrier based Ultra

Wide Band communication system.
49. Apparatus according to claim 48, wherein the main device belongs to an OFDM based Ultra Wide Band communication system.
50. Apparatus according to claim 48 or 49, wherein the physical layer (PHY) of the main device incorporates each interference reduction means.
51. Apparatus according to any one of claims 26 to 50, wherein said at least one auxiliary device (XDVC) belongs to a fix wireless access system like a WIMAX system or to a mobile radio system defined by a mobile radio standard, like for example GSM, UMTS, CDMA, EDGE.
52. Apparatus according to any one claims 26 to 50, wherein said at least one auxiliary device (XDVC) belongs to a fix satellite service system.