Hopping pilot pattern for telecommunications
First Claim
1. A transmitter which transmits hopped pilot signals as a locally unique time-frequency shift of a time frequency plane array wherein the pilot signals are hopped using a hopping sequence.
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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).
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Citations
56 Claims
- 1. A transmitter which transmits hopped pilot signals as a locally unique time-frequency shift of a time frequency plane array wherein the pilot signals are hopped using a hopping sequence.
- 14. A telecommunications system comprising plural communicating devices, and wherein each of the plural communicating devices are identified by a permutation of a time-frequency pattern of signals transmitted therefrom, the permutation resulting either in the time-frequency pattern or a cyclic shifting of the time-frequency pattern.
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23. 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 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 (24, 25, 26, 27, 28, 29, 30)
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31. A telecommunications node comprising:
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a first antenna 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 antenna 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 from the second locally unique time-frequency shift. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38)
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39. 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 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 (40, 41, 42, 43, 44, 45, 46, 47)
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- 48. A receiver which identifies a transmitter from which it receives signals in accordance with a time-frequency shift of a time frequency plane array which includes the received signals, a pattern of pilot signals in the time frequency plane array reflecting hopping of the pilot signals in accordance with a hopping sequence.
Specification