Wireless Network System and Devices
First Claim
1. A wireless local area network device, having an antenna arrangement for transmitting first and second orthogonally polarised beams and arranged to transmit digitally modulated data as modulated symbols with redundancy between the first and second beams.
1 Assignment
0 Petitions
Accused Products
Abstract
A wireless network device (4), such as a wireless media centre, has orthogonally polarised antennas (6a, 6b) arranged to provide transmit and/or receive polarisation diversity. The antennas may be arranged so that their nulls do not coincide, to produce a combined antenna pattern with a low variation of gain with direction. The antennas may be collocated, but arranged orthogonally. Preferably, the combined antenna pattern is substantially omnidirectional in elevation as well as azimuth. This arrangement provides uniform coverage in a 3D environment. The transmitter may transmit data using polarisation-time block codes. A wireless receiver (10, 18) for use in the wireless network may have either one antenna or two orthogonally polarised antennas. The receiver (10, 18) applies maximal ratio combining to the received signals. The signals may be OFDM signals and the receiver applies maximal ratio combining independently to each frequency channel. The antennas may be flat linear or annular slot antennas, which provide strongly polarised beams and can be integrated within the housing of the devices.
41 Citations
64 Claims
- 1. A wireless local area network device, having an antenna arrangement for transmitting first and second orthogonally polarised beams and arranged to transmit digitally modulated data as modulated symbols with redundancy between the first and second beams.
- 19. A wireless local area network device, having an antenna arrangement for receiving first and second signals with orthogonal polarisation and arranged to receive digitally modulated data transmitted with redundancy between the orthogonal polarisations.
- 32. A wireless local area network comprising a transmitter arranged to transmit digitally modulated data with redundancy between first and second orthogonal polarisations, and one or more receivers, each arranged to receive said digitally modulated data.
- 41. A wireless local area network device, having at least first and second antennas, arranged to transmit modulated data with redundancy between the first and second antennas, wherein the far field pattern of each of the antennas includes a directional beam and a null, and the beam of the first antenna is arranged to overlap the null of the second antenna.
- 48. A linear slot antenna, comprising first and second parallel conductive faces with conductive edges between the faces and a cavity between the faces with a thickness substantially less than the dimensions of the first and second faces, a linear slot in the first conductive face and a strip conductor arranged substantially centrally within the cavity and orthogonally to the slot.
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51. A wireless network device having a housing including a planar conductive surface and a linear slot antenna mounted on the planar conductive surface.
- 52. An annular slot antenna, comprising first and second parallel conductive faces with conductive edges between the faces and a cavity between the faces with a thickness substantially less than the dimensions of the first and second faces, an annular slot in the first conductive face and at least first and second mutually angularly displaced strip conductors arranged substantially centrally within the cavity and orthogonally to the circumference of the annular slot.
- 56. An annular slot antenna, comprising first and second parallel conductive faces with conductive edges between the faces and a cavity between the faces with a thickness substantially less than the dimensions of the first and second faces, an annular slot in the first conductive face and first, second and third strip conductors equiangularly spaced and arranged substantially centrally within the cavity and orthogonally to the circumference of the annular slot.
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61. A wireless network device having a housing including a planar conductive surface and an annular slot antenna mounted on the planar conductive surface.
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62. A wireless media device arranged to transmit one or more media streams over a local area network to one or more receivers, the device including first and second orthogonally arranged linear slot antennas and being arranged to transmit said one or media streams through the first and second antennas using space-time block codes.
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63. A wireless media network comprising a wireless media transmitter arranged to transmit one or more media streams over a local area network to one or more receivers, the transmitter including first and second orthogonally polarised linear slot antennas and being arranged to transmit said one or media streams through the first and second antennas using polarisation-time block codes, and the one or more receivers including means for decoding signals received from the first and second antennas using maximal ratio combining.
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64. A wireless media gateway device arranged to receive one or more media programmes and to transmit said one or more media programmes over a local area network, the device including first and second orthogonally arranged linear slot antennas and being arranged to transmit said one or media programmes through the first and second antennas using space-time block codes.
Specification