Programmable matched filter searcher for multiple pilot searching

A programmable matched filter searcher comprising:

• a first shift register, operating as a single shift register when receiving a first type of data and operating as a multiple shift registers when receiving a second type of data, for receiving sets of incoming in-phase(I) first or second type of data from one or a plurality of sources;
• a second shift register, operating as a single shift register when receiving a first type of data and operating as a multiple shift registers when receiving a second type of data, for receiving sets of incoming quadrature (Q) first or second type of data from one or a plurality of sources;
• a PN generator for generating PN sequences;
• a matched filter having:
• a despreader for receiving said sets of I data, said sets of Q data, and said PN sequences and for producing sets of despread I values and producing sets of despread Q values, the despreader concurrently receiving multiple PN sequences and producing distinct sets of despread I and Q values when receiving second type of data from the first and second shift registers;
• a first set of summers for summing the sets of despread I and Q values from the despreader, for producing complete I and Q sums when the data from the first and second shift registers are the second type of data, and for producing partial I and Q sums when the data from the first and second shift registers are the first type of data;
• a second set of summers for receiving the partial sums from the first set of summers and producing complete I and Q sums when the data from the shift registers are the first type of data
• an I accumulator for receiving said complete I sums and accumulating them in sets to produce a set of accumulated I sums;
• a Q accumulator for receiving said complete Q sums and accumulating them in sets to produce a set of accumulated Q sums;
• an energy calculator for receiving sets of accumulated I sums and sets of accumulated Q sums, squaring respective ones of sets of accumulated I sums, squaring respective ones of sets of accumulated Q sums, and summing the results of said squares of respective ones of sets of I and Q sums to produce sets of energy values;
• and
• outputs for providing said set of accumulated I sums and said set of accumulated Q sums prior to processing in said energy calculator.

A programmable matched filter searcher comprising:

• a shift register, operating as a single shift register when receiving a first type of data and operating as a multiple shift registers when receiving a second type of data, the first type of data being received from a single source and the second type of data being received from a plurality of sources;
• a plurality of PN generators for generating a plurality of PN sequences;
• a loadable matched filter for loading said plurality of PN sequences, despreading said sets of incoming data and summing the intermediate results;
• and
• an accumulator for receiving said sums and accumulating them in sets to produce a set of accumulated sums.

A method for performing programmable matched filter searching comprising the steps of:

• a) storing one set of I and Q data in a shift register if the data is a first type of data and storing a plurality of sets of I and Q data in the shift register if the data is a second type of data;
• b) producing one or a plurality of PN sequences;
• c) despreading the data with one PN sequence if the data are of the first type to produce a set of I and Q despread values and despreading the data with plurality of PN sequences if the data are of the second type to produce sets of I and Q despread values;
• d) summing results of said despread I values;
• e) summing results of said despread Q values;
• f) accumulating the resultant summed despread I values to produce one or a plurality of results, respectively;
• and
• g) accumulating the resultant summed despread Q values to produce one or a plurality of results, respectively.