Method and apparatus for providing carrier frequency offset compensation in a TDMA communication system
First Claim
1. A method for providing carrier frequency offset compensation in a time division multiple access (TDMA) communication system comprising the steps of:
- receiving a transmitted signal, which includes a synchronization signal pattern, at least one known portion and a message signal portion , in a TDMA time slot, via a transmission channel;
determining a first phase error in response to receipt of the synchronization signal pattern;
determining a second phase error in response to receipt of the at least one known portion of the transmitted signal;
comparing the first phase error with the second phase error to determine a resultant phase error; and
adjusting a received signal parameter, such as sampling rate and phase angle, in order to eliminate the resultant phase error and compensate for carrier frequency offsets.
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Accused Products
Abstract
The present invention relates to a method and apparatus for providing carrier frequency offset compensation in a time division multiple access (TDMA) communication system. In this effort a TDMA receiver is adapted to receive, via a transmission channel, a transmitted signal burst which includes a synchronization signal pattern, a message signal portion and at least one known portion, in a TDMA time slot. Initially, a phase error at that portion of the received signal which corresponds to the known portion of the transmitted signal is determined. Thereafter, various received signal parameters are adjusted in order to eliminate the phase error and thereby compensate for any carrier frequency offsets.
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Citations
24 Claims
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1. A method for providing carrier frequency offset compensation in a time division multiple access (TDMA) communication system comprising the steps of:
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receiving a transmitted signal, which includes a synchronization signal pattern, at least one known portion and a message signal portion , in a TDMA time slot, via a transmission channel; determining a first phase error in response to receipt of the synchronization signal pattern; determining a second phase error in response to receipt of the at least one known portion of the transmitted signal; comparing the first phase error with the second phase error to determine a resultant phase error; and adjusting a received signal parameter, such as sampling rate and phase angle, in order to eliminate the resultant phase error and compensate for carrier frequency offsets. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for providing carrier frequency offset compensation in a time division multiple access (TDMA) communication system comprising the steps of:
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receiving a transmitted signal, which includes a synchronization signal pattern, a known tail bit portion and a message signal portion, in a TDMA time slot, via a transmission channel; determining a first transmission channel impulse response (CIR) for the synchronization signal portion of the received signal; determining a second transmission channel impulse response (CIR) for the tail bit portion of the received signal; comparing the first CIR to the second CIR to determine a phase error; and adjusting a received signal parameter, such as sampling rate and phase angle, in order to eliminate the phase error and compensate for carrier frequency offsets. - View Dependent Claims (11, 12, 13, 14, 15)
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16. An apparatus for providing carrier frequency offset compensation in a time division multiple access (TDMA) communication system comprising:
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means for receiving a transmitted signal, which includes a synchronization signal pattern, at least one known tail bit portion and a message signal portion, in a TDMA time slot, via a transmission channel; means, coupled to the receiving means, for determining a first phase error at the synchronization signal pattern portion of the received signal; means, coupled to the receiving means, for determining a second phase error at the at least one known tail bit portion of the received signal; means, coupled to the determining means for comparing the first and second phase errors to determine a phase angle difference; and means, coupled to the comparing means, for adjusting received signal parameters, such as sampling rate and phase angle in order to compensate for the phase angle difference prior to decoding the message signal portion of the received transmission. - View Dependent Claims (17, 18, 19, 20, 21)
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22. An apparatus for providing carrier frequency offset compensation in a time division multiple access (TDMA) communication system comprising:
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a receiver for receiving a transmitted signal, which includes a synchronization signal pattern, a tail bit portion and a message signal portion, in a TDMA time slot, via a transmission channel; means, coupled to the receiver, for estimating a first and second channel impulse response at different locations within the TDMA timeslot; means, coupled to the estimating means, for comparing the first and second channel impulse responses to determine a phase error; and means, coupled to the comparing means, for adjusting received signal parameters, such as sampling rate and phase angle in order to compensate for the phase error. - View Dependent Claims (23)
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24. An apparatus for providing carrier frequency offset compensation in a time division multiple access (TDMA) communication system comprising:
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a receiver for receiving a transmitted signal, which includes a synchronization signal pattern, a tail bit portion and a message signal portion, in a TDMA time slot, via a transmission channel; means, coupled to the receiver, for detecting a received synchronization signal pattern to determine a first channel impulse response for the TDMA timeslot; means, coupled to the receiver, for detecting a received tail bit portion to determine a second channel impulse response for the TDMA timeslot; means, coupled to the detecting means, for comparing the first and second channel impulse responses to determine a phase error; and means, coupled to the comparing means, for adjusting received signal parameters, such as sampling rate and phase angle in order to compensate for the phase error.
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Specification