Multi-diversity synchronization technique for improving synchronization performance in wireless applications over fading channels
First Claim
1. A method of performing time synchronization on a plurality of received signals in a telecommunications system, each of the plurality of received signals comprising a synchronization word, said method comprising the steps of:
- selecting one of the plurality of received signals to be a reference signal;
estimating respective cross-correlation functions between the reference signal and each received signal not being used as the reference signal;
determining respective offsets between the reference signal and each received signal not being used as the reference signal;
time aligning the plurality of received signals;
determining a first synchronization word location from the time aligned signals; and
determining a synchronization word location for each received signal based upon the first synchronization word.
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Abstract
A computer implemented method and apparatus utilizing a multi-diversity synchronization technique for improving time synchronization in wireless applications, such as TDMA applications is disclosed. The multi-diversity synchronization technique utilizes cross-correlations between multiple diverse received signals to determine relative offsets between the signals. The signals are then time aligned. An absolute synchronization word location is determined using the time aligned signals and is used along with the relative offsets to determine respective synchronization word locations for each received signal in an accurate, efficient and improved manner.
56 Citations
27 Claims
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1. A method of performing time synchronization on a plurality of received signals in a telecommunications system, each of the plurality of received signals comprising a synchronization word, said method comprising the steps of:
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selecting one of the plurality of received signals to be a reference signal;
estimating respective cross-correlation functions between the reference signal and each received signal not being used as the reference signal;
determining respective offsets between the reference signal and each received signal not being used as the reference signal;
time aligning the plurality of received signals;
determining a first synchronization word location from the time aligned signals; and
determining a synchronization word location for each received signal based upon the first synchronization word. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of demodulating a plurality of received signals in a telecommunications system, each of the plurality of signals comprising a synchronization word, said method comprising the steps of:
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selecting one of the plurality of received signals to be a reference signal;
estimating respective cross-correlation functions between the reference signal and each received signal not being used as the reference signal;
determining respective offsets between the reference signal and each received signal not being used as the reference signal;
time aligning the plurality of received signals;
determining a first synchronization word location from the time aligned signals;
determining a synchronization word location for each received signal based upon the first synchronization word; and
demodulating the received signals based upon the determined synchronization word location for each received signal. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A receiver for a telecommunications system, comprising:
a controller, said controller receiving a plurality of signals, each of the plurality of signals comprising a synchronization word, said controller for selecting one of the plurality of received signals to be a reference signal, estimating respective cross-correlation functions between the reference signal and each received signal not being used as the reference signal, determining respective offsets between the reference signal and each received signal not being used as the reference signal, time aligning the plurality of received signals, determining a first synchronization word location from the time aligned signals, and determining a synchronization word location for each received signal based upon the first synchronization word. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. A base station for a telecommunications system, comprising:
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a plurality of antennas; and
a receiver, said receiver coupled to said plurality of antennas, and receiving respective signals from each antenna, each of the plurality of received signals comprising a synchronization word, said receiver comprising a controller, said controller for selecting one of the plurality of received signals to be a reference signal, estimating respective cross-correlation functions between the reference signal and each received signal not being used as the reference signal, determining respective offsets between the reference signal and each received signal not being used as the reference signal, time aligning the plurality of received signals, determining a first synchronization word location from the time aligned signals, and determining a synchronization word location for each received signal based upon the first synchronization word.
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Specification