Reverse link correlation filter in wireless communication systems
First Claim
1. A method for use in wireless communication, the method comprising:
- receiving signals over a code division multiple access (CDMA) channel, each received signal having a user-unique code and an associated data rate;
correlating the received signal with the user-unique code at a basic data rate using time multiplexing in a single correlation filter to produce one or more sets of correlated outputs;
demultiplexing and demodulating the one or more sets of correlated outputs to generate demultiplexed and demodulated sets of correlated outputs; and
on a condition that the associated data rate is a multiple of the basic data rate, summing the demultiplexed and demodulated sets of correlated outputs at the multiple of the basic data rate to recover user information from the received signal at the associated data rate.
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Abstract
A single, common correlation filter (CF) core is provided in a receiver for recovery of data from received code division multiple access (CDMA) signals. Signals are received over CDMA channels with different data rates, where the received signals include user information such as pilot and data symbols that have been spread according to different despreading rates including tier 1, tier 2 and tier 3 rates, where tier 1 is the smallest despreading rate. The received signal is correlated at the smallest despreading rate in the correlation filter (CF) by time multiplexing delayed versions of the pseudorandom noise (PN) code. The correlated information is then demultiplexed and pilot-aided QPSK demodulated. The demodulated information is summed at the proper integer multiple of the tier 1 rate to achieve tier 2 and tier 3 despreading rates. According to an embodiment, the three strongest multipaths components in terms of the received power are selected in a window or time period for optimal information recovery.
29 Citations
25 Claims
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1. A method for use in wireless communication, the method comprising:
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receiving signals over a code division multiple access (CDMA) channel, each received signal having a user-unique code and an associated data rate; correlating the received signal with the user-unique code at a basic data rate using time multiplexing in a single correlation filter to produce one or more sets of correlated outputs; demultiplexing and demodulating the one or more sets of correlated outputs to generate demultiplexed and demodulated sets of correlated outputs; and on a condition that the associated data rate is a multiple of the basic data rate, summing the demultiplexed and demodulated sets of correlated outputs at the multiple of the basic data rate to recover user information from the received signal at the associated data rate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An apparatus for use in wireless communications, the apparatus comprising:
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a receiver configured to receive signals over a code division multiple access (CDMA) channel, each received signal having a user-unique code and an associated data rate; a correlation filter configured to correlate the received signal with the user-unique code at a basic data rate using time multiplexing to produce one or more sets of correlated outputs; a demultiplexer configured to demultiplex the one or more sets of correlated outputs to generate demultiplexed sets of correlated outputs; and a data post processor configured to; demodulate the sets of demultiplexed outputs to generate demultiplexed and demodulated sets of correlated outputs; and on a condition that the associated data rate is a multiple of the basic data rate, sum the demultiplexed and demodulated sets of correlated outputs at the multiple of the basic data rate to recover user information from the received signal at the associated data rate. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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Specification