Method of determining sampling time points
First Claim
1. A signal processing method comprising the steps of:
 sampling an analog signal at recurrent signal sampling time points which are selected relative to a synchronization time point common to a transmitter and a receiver, such that a time interval for transmission of a symbol comprises a whole number of signal sampling time points;
correlating known synchronization sequences with sampled values generated by said sampling step to generate correlation values;
determining energy values related to said correlation values;
down sampling said energy values at a desired number of the signal sampling points which are mutually spaced apart by the time interval;
calculating at least one comparison value based on said down sampled energy values and corresponding to at least one sampling signal time point;
selecting one of the at least one comparison values having a largest magnitude;
selecting one of the signal sampling time points which correspond to the selected largest comparison value as a reference sampling time point for one of said known synchronization sequences; and
using said reference sampling time point to further process said analog signal.
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Abstract
Symbol sequences having synchronization sequences are transmitted over a radio channel. Received signals are sampled in signal sampling time points (n) and by correlation a channel response (C^{2}) is obtained. The impulse response is sampled (T_{s}) over a period (M×N) corresponding to time dispersion of the channel. For separate samples with separate start points (n), channel estimates are obtained (n=0, 2, 4, 6, N=1, 3, 5, 7. . .) whose energy values are calculated, and the estimate (n=8, 10, 12, 14) with the largest energy is selected. The first time point (n=8) in this estimate is selected as sampling time point for the symbol sequence. Alternatively, the signal sampling time point (n=9) with maximum energy value (C^{2} max) is selected. By comparing the energy values either one of these signal sampling time points (n=8 , n=9) can be selected as the sampling time point for the symbol sequence. For consecutive sequences, an average value for the sampling time points is calculated.
17 Citations
10 Claims

1. A signal processing method comprising the steps of:

sampling an analog signal at recurrent signal sampling time points which are selected relative to a synchronization time point common to a transmitter and a receiver, such that a time interval for transmission of a symbol comprises a whole number of signal sampling time points; correlating known synchronization sequences with sampled values generated by said sampling step to generate correlation values; determining energy values related to said correlation values; down sampling said energy values at a desired number of the signal sampling points which are mutually spaced apart by the time interval; calculating at least one comparison value based on said down sampled energy values and corresponding to at least one sampling signal time point; selecting one of the at least one comparison values having a largest magnitude; selecting one of the signal sampling time points which correspond to the selected largest comparison value as a reference sampling time point for one of said known synchronization sequences; and using said reference sampling time point to further process said analog signal.  View Dependent Claims (2, 3, 4, 5)


6. A signal processing method comprising the steps of:

sampling an analog signal at recurrent signal sampling time points which are selected relative to a synchronization time point common to a transmitter and a receiver, such that a time interval for transmission of a symbol comprises a whole number of signal sampling time points; correlating known synchronization sequences with sampled values generated by said sampling step to generate correlation values; determining energy values related to said correlation values; selecting an energy value having a largest magnitude; multiplying said energy value having the largest magnitude by a predetermined constant to determine a first comparison value; down sampling said energy values at a desired number of the signal sampling points that are mutually spaced apart by the time interval; calculating at least one second comparison value based on said down sampled energy values and corresponding to at least one sampling signal time point; selecting one of the at least one second comparison values having a largest magnitude; comparing said first comparison value with said selected at least one second comparison value; selecting a signal sampling time point, which corresponds to one of the first comparison value and the selected at least one second comparison value, based on said comparing step as a reference sampling time point for one of said known synchronization sequences; and using said reference sampling time point to further process said analog signal.  View Dependent Claims (7, 8, 9, 10)

1 Specification