Matched filter and spread spectrum receiver

A matched filter for implementing the correlation of input signals and reference signals, the matched filter comprising:

• first means for storing M samples taken from N input signals and for storing said M samples of the N input signals one at a time at said N input signals' frequencies;
• second means for storing K M-sample long reference signals, wherein K≧2 and said M-sample long reference signals correspond to more than one transmitter;
• multiplexing means for applying one of said N input signals and one of said M-sample long reference signals at a time from said first and second storage means to calculation means by applying alternately at least one combination of the N input signals and the M-sample long reference signals to the calculation means;
• and
• calculation means for calculating the correlation time-dividedly for each combination of said N input signals and said M-sample long reference signals so that correlation results calculated from different combinations appear at the output of the calculation means as a sequence.

A spread spectrum receiver comprising a device for detecting a demodulated signal, received by the receiver and converted into digital samples, the device comprising a matched filter for calculating the correlation between an input signal and at least one reference signal, and a controller for comparing the correlation results generated by the matched filter with a predetermined threshold value to determine if a signal is found, the matched filter comprising:

• first means for storing M samples taken from N input signals, wherein N≧2, and in which M samples of the N input signals are stored one sample at a time at a frequency of each of the N input signals;
• second means for storing K M-sample long reference signals, wherein K≧2 and said M-sample long reference signals correspond to more than one transmitter;
• multiplexing means for applying one of said N input signals and one of said M-sample long reference signals at a time from said first and second storage means to calculation means by applying alternately at least one combination of the N input signal and the M-sample long reference signal to the calculation means;
• and
• calculation means for calculating the correlation time-dividedly for a combination of said N input signals and said M-sample long reference signals so that correlation results calculated from different input and reference signals appear at the output of the calculation means as a sequence.

A spread spectrum receiver comprising a device for detecting a demodulated signal, received by the receiver and converted into digital samples, the device comprising a matched filter for calculating the correlation between an input signal and at least one reference signal, and a controller for comparing the correlation results generated by the matched filter with a predetermined threshold value to determine if a signal is found, said matched filter comprising:

• first means for storing M samples taken from N input signals, wherein N≧1, and in which said M samples of the N input signals are stored one sample at a time at a sample frequency for each of said N input signals;
• second means for storing K M-sample long reference signals, wherein K≧2 and said M-sample long reference signals correspond to more than one transmitter;
• multiplexing means for applying one of said N input signals and one of said M-sample long reference signals at a time from said first and second storage means to calculation means by applying alternately at least one combination of the N input signals and one of the M-sample long reference signals to the calculation means;
• and
• calculation means for calculating the correlation time-dividedly for each combination of the N input signals and the M-sample long reference signals so that correlation results calculated from different combinations appear at the output of the calculation means as a sequence.