Hopping pilot pattern for telecommunications
First Claim
1. A transmitter comprising:
- a combiner configured to introduce pilot signals into a stream of user data as a locally unique time-frequency shift of a time frequency plane array, wherein the time frequency plane array is generated from a regular spaced base signal which is hopped using a hopping sequence, and wherein the locally unique time-frequency shift of the time frequency plane array involves a time shift and a frequency shift,a channel transmission element configured to apply the stream of user data with the introduced pilot signals onto a channel,a memory configured to store the hopping sequence upon which the time frequency plane array is based, the hopping sequence being configured in the memory so that any two time-frequency shifts of the time frequency plane array has a predetermined number of coincidences.
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Accused Products
Abstract
A transmitter (22) of a telecommunications system transmits hopped pilot signals as a distinct (i.e., locally unique) time-frequency shift of a time frequency plane array wherein the pilot signals are hopped using a hopping sequence. Differing transmitters of the system (20) preferably transmit using different time-frequency shifts of the same time frequency plane array. The transmitter (22) knows which hopping sequence to employ to generate the time frequency plane array in view of its storage of the hopping sequence, and further knows how to perform its signature time-frequency shift the time frequency plane array thusly created in view of its storage of the time-frequency shift pattern. A receiver (24) identifies a transmitter from which the receiver obtains signals by detecting the particular time-frequency shift of the time frequency plane array and associating the particular time-frequency shift with the originating transmitter. Upon detecting the time frequency plane array of its received signals, the receiver (24), which knows the hopping sequence employed to generate the time frequency plane array, can determine how the time frequency plane array has been time-frequency shifted, and upon determining the pattern of the shift can associate the received signals with one of the transmitters for which the receiver (24) has stored time-frequency shift patterns in its library (86).
49 Citations
41 Claims
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1. A transmitter comprising:
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a combiner configured to introduce pilot signals into a stream of user data as a locally unique time-frequency shift of a time frequency plane array, wherein the time frequency plane array is generated from a regular spaced base signal which is hopped using a hopping sequence, and wherein the locally unique time-frequency shift of the time frequency plane array involves a time shift and a frequency shift, a channel transmission element configured to apply the stream of user data with the introduced pilot signals onto a channel, a memory configured to store the hopping sequence upon which the time frequency plane array is based, the hopping sequence being configured in the memory so that any two time-frequency shifts of the time frequency plane array has a predetermined number of coincidences. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A transmitter comprising:
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a combiner configured to introduce pilot signals into a stream of user data as a locally unique time-frequency shift of a time frequency plane array wherein the pilot signals are hopped using a hopping sequence, wherein the hopping sequence is a Costas sequence; a channel transmission element configured to apply the stream of user data with the introduced pilot signals onto a channel, a memory configured to store the hopping sequence upon which the time frequency plane array is based, the hopping sequence being stored in the memory as a periodic hopping sequence wherein the Costas sequence repeats for one or more periods to accommodate a number of pilot signals in one of the time domain and the frequency domain.
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8. A transmitter comprising:
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a combiner configured to introduce pilot signals into a stream of user data as a locally unique time-frequency shift of a time frequency plane array wherein the pilot signals are hopped using a hopping sequence, wherein the hopping sequence is a Costas sequence; a channel transmission element configured to apply the stream of user data with the introduced pilot signals onto a channel, a memory configured to store the hopping sequence upon which the time frequency plane array is based, the hopping sequence being stored in the memory as a perfect periodic Costas sequence configured by augmenting a Welsh-constructed periodic Costas array with an empty row or an empty column. - View Dependent Claims (9, 10, 11)
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12. A telecommunications system comprising:
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a first orthogonal frequency division multiplexing (OFDM) transmitter which transmits hopped pilot signals as a first locally unique time-frequency shift of a time frequency plane array wherein the pilot signals are hopped using a hopping sequence; a second orthogonal frequency division multiplexing (OFDM) transmitter which transmits hopped pilot signals as a second locally unique time-frequency shift of the same time frequency plane array; wherein the first locally unique time-frequency shift is different in both time and frequency from the second locally unique time-frequency shift; a receiver which identifies a transmitter from which it receives orthogonal frequency division multiplexing (OFDM) signals in accordance with whether received signals are those of the first locally unique time-frequency shift or the second locally unique time-frequency shift of the time frequency plane array. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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21. A receiving node of a telecommunications systems, the receiving node comprising:
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a receiver configured to receive orthogonal frequency division multiplexing (OFDM) signals transmitted from a transmitting node, the transmitting node comprising a first antenna and a second antenna, wherein the first antenna of the transmitting node transmits hopped pilot signals as a first locally unique time-frequency shift of a time frequency plane array wherein the pilot signals are hopped using a hopping sequence and the second antenna of the transmitting node transmits hopped pilot signals as a second locally unique time-frequency shift of the same time frequency plane array, and wherein the first locally unique time-frequency shift is different in both time and frequency from the second locally unique time-frequency shift; a transmitter identifier configured to identify an antenna from the first and second antennas from which it receives the orthogonal frequency division multiplexing (OFDM) signal in accordance with whether received signals are those of the first locally unique time-frequency shift or the second locally unique time-frequency shift of the time frequency plane array. - View Dependent Claims (22, 23, 24, 25, 26, 27)
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28. A method of operating a telecommunications system comprising:
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transmitting, from a first transmitter, hopped pilot signals as a first locally unique time-frequency shift of a time frequency plane array wherein the pilot signals are hopped using a hopping sequence; transmitting, from a second transmitter, hopped pilot signals as a second locally unique time-frequency shift of the same time frequency plane array, wherein the first locally unique time-frequency shift is different in both time and frequency from the second locally unique time-frequency shift; and
,identifying a transmitter from which a receiver receives signals in accordance with whether received signals are those of the first locally unique time-frequency shift or the second locally unique time-frequency shift of the time frequency plane array. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35)
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36. A receiver comprising:
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a channel reception element configured to receive a stream of user data into which pilot signals have been introduced in accordance wit a time-frequency shift of a time frequency plane array which includes the received signals; a transmitter identifier configured to identify a transmitter from which the receiver receives signals in accordance with the time-frequency shift of a time frequency plane array which includes the received signals, wherein the time frequency plane array reflects a regular spaced base signal which is hopped using a hopping sequence, and wherein the locally unique time-frequency shift of the time frequency plane array involves a time shift and a frequency shift; a memory configured to store the hopping sequence upon which the time frequency plane array is based, the hopping sequence being stored in the memory as a Costas sequence which repeats for one or more periods to accommodate a number of pilot signals in one of the time domain and the frequency domain. - View Dependent Claims (37, 38, 39, 40)
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41. A receiver comprising:
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a channel reception element configured to receive a stream of user data into which pilot signals have been introduced in accordance with a time-frequency shift of a time frequency plane array which includes the received signals; a transmitter identifier configured to identify a transmitter from which the receiver receives signals in accordance with the time-frequency shift of a time frequency plane array which includes the received signals, wherein the time frequency plane array reflects a regular spaced base signal which is hopped using a hopping sequence, and wherein the locally unique time-frequency shift of the time frequency plane array involves a time shift and a frequency shift; a memory configured to store the hopping sequence upon which the time frequency plane array is based, the hopping sequence being stored in the memory as a perfect periodic Costas sequence configured by augmenting a Welsh-constructed periodic Costas array with an empty row or an empty column.
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Specification