Broadcast burst using spatial diversity for a radio communications system
First Claim
Patent Images
1. A method comprising:
- sending a first sequence of symbols of a communications burst using a first set of spatial parameters from an array of antenna elements; and
sending a second sequence of symbols of the communications burst using a second set of different spatial parameters from the array of antenna elements,wherein the symbols for each symbol sequence are based on the same bit sequence, the bit sequence being scrambled differently for each symbol sequence.
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Abstract
A method and apparatus are provided that allows a single spatially directed broadcast burst to serve users throughout a base station sector. In one embodiment, the invention includes sending a first segment of a broadcast channel burst using a first set of unchanging spatial parameters from an array of antenna elements, and sending a second segment of the broadcast channel burst using a second set of different unchanging spatial parameters from the array of antenna elements.
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Citations
36 Claims
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1. A method comprising:
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sending a first sequence of symbols of a communications burst using a first set of spatial parameters from an array of antenna elements; and sending a second sequence of symbols of the communications burst using a second set of different spatial parameters from the array of antenna elements, wherein the symbols for each symbol sequence are based on the same bit sequence, the bit sequence being scrambled differently for each symbol sequence. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A radio user terminal comprising:
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a register to store a plurality of code words; a receiver to receive a first sequence of symbols of a communications burst having a first set of spatial parameters, and to receive a third sequence of symbols of the communications burst having the first set of spatial parameters from an array of antenna elements, the third sequence of symbols following a second sequence of symbols of the communication burst that uses a second set of different spatial parameters; and a processor to descramble the first and third symbol sequences but not the second symbol sequence using one of the plurality of code words. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A communications method comprising:
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transmitting a first sequence of symbols of a communications burst corresponding to a first set of spatial parameters for an array of antenna elements; and transmitting a second sequence of symbols of the same communications burst corresponding to a second set of different spatial parameters for the array of antenna elements, wherein the spatial parameters comprise relative phases and amplitudes for the elements of the antenna array. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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21. A radio terminal comprising:
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register to store a plurality of code words; a processor to select one of the plurality of code words and generate a first sequence of symbols of a communications burst by scrambling the code word with a first scrambling sequence and to generate second sequence of symbols of the communications burst by scrambling the code word with a second scrambling sequence; a modulator to modulate the first symbol sequence and the second symbol sequence using a single modulation format; and a transmitter to send the first symbol sequence using a first set of spatial parameters, and to send the second symbol sequence using a second set of different spatial parameters from an array of antenna elements. - View Dependent Claims (22, 23, 24, 25, 26, 27)
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28. A communications method comprising:
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transmitting a first sequence of symbols of a communications burst corresponding to a first set of spatial parameters for an array of antenna elements; transmitting a second sequence of symbols of the communications burst corresponding to a second set of different spatial parameters for the array of antenna elements; and transmitting a third sequence of symbols of the communications burst corresponding to a third set of different spatial parameters for the array of antenna elements, the first, second, and third symbol sequences containing the same number of symbols. - View Dependent Claims (29, 30, 31, 32)
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33. A communications method comprising:
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transmitting a first sequence of symbols of a communications burst corresponding to a first set of spatial parameters for an array of antenna elements; transmitting a second sequence of symbols of the communications burst corresponding to a second set of different spatial parameters for the array of antenna elements; and transmitting a preamble sequence of symbols corresponding to a third set of different spatial parameters for the array of antenna elements, the preamble symbol sequence being transmitted adjacent to and before the first symbol sequence.
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34. A communications method comprising:
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transmitting a first sequence of symbols of a communications burst corresponding to a first set of spatial parameters for an array of antenna elements; and transmitting a second sequence of symbols of the communications burst corresponding to a second set of different spatial parameters for the array of antenna elements, wherein the symbols for each symbol sequence are selected from a code word of a set of code words and wherein the set of code words is associated with a particular broadcast channel radio of a plurality of different broadcast channel radios.
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35. A radio terminal comprising:
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register to store a plurality of code words; a processor to select one of the plurality of code words and generate a first sequence of symbols of a communications burst by scrambling the code word with a first scrambling sequence and to generate second sequence of symbols of the communications burst by scrambling the code word with a second scrambling sequence; and a transmitter to send the first symbol sequence using a first set of spatial parameters, and to send the second symbol sequence using a second set of different spatial parameters from an array of antenna elements, wherein the spatial parameters are selected to direct energy of each symbol sequence of the communications burst in a different direction.
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36. A radio terminal comprising:
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register to store a plurality of code words; a processor to select one of the plurality of code words and generate a first sequence of symbols of a communications burst by scrambling the code word with a first scrambling sequence and to generate second sequence of symbols of the communications burst by scrambling the code word with a second scrambling sequence; and a transmitter to send the first symbol sequence using a first set of spatial parameters, and to send the second symbol sequence using a second set of different spatial parameters from an array of antenna elements, wherein the processor further generates a preamble sequence of symbols of the communications burst without using the selected code word and wherein the transmitter sends the preamble sequence using a third set of different spatial parameters from the array of antenna elements, the preamble sequence being adjacent to and before the first symbol sequence.
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Specification