Training sequences for peak to average power constrained modulation formats
First Claim
1. A method comprising:
- selecting an original training sequence from a set of possible original training sequences having at least one or more desired properties, the selected original training sequence comprising a sequence of complex numbers corresponding to phase shifts employed by a π
/M−
MPSK modulation format, M being a positive integer; and
forming a modified training sequence by multiplying each element of the selected original training sequence by a corresponding element of a modifying sequence, the modifying sequence comprising a sequence of pairs of equal complex numbers, wherein each pair of equal complex numbers comprises the previous pair of equal complex numbers multiplied by expj2π
/M;
wherein the modified training sequence exhibits the-one or more desired properties of the selected original training sequence when used in a peak to average power constrained modulation format that would otherwise impair the at least one or more desired properties of the selected original training sequence.
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Accused Products
Abstract
A method and apparatus are provided that generate, transmit, or receive a training sequence in a communications system, where the training sequence exhibits certain desirable characteristics when used by a peak to average power constrained modulation formal. In one embodiment, the invention includes selecting an original training sequence from a set of possible original training sequences having at least one desired property, forming a modified training sequence by modifying the original training sequence based on a corresponding modifying sequence, such that the modified training sequence exhibits the desired property of the original training sequence when used in a peak to average power constrained modulation format that would otherwise impair the desired property of the original training sequence.
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Citations
23 Claims
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1. A method comprising:
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selecting an original training sequence from a set of possible original training sequences having at least one or more desired properties, the selected original training sequence comprising a sequence of complex numbers corresponding to phase shifts employed by a π
/M−
MPSK modulation format, M being a positive integer; andforming a modified training sequence by multiplying each element of the selected original training sequence by a corresponding element of a modifying sequence, the modifying sequence comprising a sequence of pairs of equal complex numbers, wherein each pair of equal complex numbers comprises the previous pair of equal complex numbers multiplied by expj2 π /M;wherein the modified training sequence exhibits the-one or more desired properties of the selected original training sequence when used in a peak to average power constrained modulation format that would otherwise impair the at least one or more desired properties of the selected original training sequence. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method comprising:
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selecting an original training sequence from a set of possible original training sequences having at least one or more desired properties, the selected original training sequence comprising a sequence of phase shifts to be performed on a waveform as employed by a π
/M−
MPSK modulation format, M being a positive integer; andforming a modified training sequence by multiplying each element of the selected original training sequence by a corresponding element of a modifying sequence, the modifying sequence comprising a sequence of pairs of equal phase shifts, wherein each pair of equal phase shifts is larger in magnitude by 2π
/M radians than the previous pair of equal phase shifts;wherein the modified training sequence exhibits at least one or more desired properties of the selected original training sequence when used in a peak to average power constrained modulation format that would otherwise impair at least one or more desired properties of the selected original training sequence. - View Dependent Claims (11, 12)
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13. A method comprising:
transmitting a modified training sequence derived by selecting an original training sequence from a set of possible original training sequences having at least one or more desired properties, the selected original training sequence comprising a sequence of phase shifts to be performed on a waveform employed by a π
/M−
MPSK modulation format, M being a positive integer, and multiplying each element of the selected original training sequence by a corresponding element of a modifying sequence, the modifying sequence comprising a sequence of pairs of equal phase shifts, wherein each pair of equal phase shifts is larger in magnitude by 2π
/M radians than the previous pair of equal phase shifts.
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14. A base station comprising:
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a data storage element to store a modified training sequence derived by selecting an original training sequence from a set of possible original training sequences having at one or more desired properties, the selected original training sequence comprising a sequence of phase shifts to be performed on a waveform as employed by a π
/M−
MPSK modulation format, M being a positive integer, and multiplying each element of the selected original training sequence by a corresponding element of a modifying sequence, the modifying sequence comprising a sequence of pairs of equal phase shifts, wherein each pair of equal phase shifts is larger in magnitude by 2π
/M radians than the previous pair of equal phase shifts;a receiver to receive a communication waveform; and a processor to train the base station using the received communication waveform and the stored modified training sequence. - View Dependent Claims (15, 16, 17)
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18. A machine-readable medium having stored thereon data representing instructions that, when executed by a processor, cause the processor to perform operations to:
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select an original training sequence from a set of possible original training sequences having at least one or more desired properties, the selected original training sequence comprising a sequence of complex numbers corresponding to phase shifts employed by a π
/M−
MPSK modulation format, M being a positive integer; andform a modified training sequence by multiplying each element of the selected original training sequence by a corresponding element of a modifying sequence, the modifying sequence comprising a sequence of pairs of equal complex numbers, wherein each pair of equal complex numbers comprises the previous pair equal complex numbers multiplied by expj2 π /M;wherein the modified training sequence exhibits at least one or more desired properties of the selected original training sequence when used in a peak to average power constrained modulation format that would otherwise impair the one or more desired properties of the selected original training sequence. - View Dependent Claims (19, 20, 21, 22, 23)
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Specification