Abstract: Burst transmissions in a burst-type communication system include a preamble synchronization sequence which allows detection and synchronization a burst transmission while at the same time providing information to a receiver, for example, on the subsequent burst payload data. Each burst transmission includes a preamble synchronization sequence which is one of a plurality of predetermined allowed preamble sequences in the system, according to the information desired to be transmitted. The system may also use differential encoding and decoding to eliminate the effects of frequency uncertainty. In that case, the allowed preamble sequences may be such that, after differential decoding, they differ from one another only by a polarity inversion such that a single matched filter may be used to detect two preamble sequences.

Abstract: Burst transmissions in a burst-type communication system include a preamble synchronization sequence which allows detection and synchronization a burst transmission while at the same time providing information to a receiver, for example, on the subsequent burst payload data. Each burst transmission includes a preamble synchronization sequence which is one of a plurality of predetermined allowed preamble sequences in the system, according to the information desired to be transmitted. The system may also use differential encoding and decoding to eliminate the effects of frequency uncertainty. In that case, the allowed preamble sequences may be such that, after differential decoding, they differ from one another only by a polarity inversion such that a single matched filter may be used to detect two preamble sequences.

Abstract: Burst transmissions in a burst-type communication system include a preamble synchronization sequence which allows detection and synchronization a burst transmission while at the same time providing information to a receiver, for example, on the subsequent burst payload data. Each burst transmission includes a preamble synchronization sequence which is one of a plurality of predetermined allowed preamble sequences in the system, according to the information desired to be transmitted. The system may also use differential encoding and decoding to eliminate the effects of frequency uncertainty. In that case, the allowed preamble sequences may be such that, after differential decoding, they differ from one another only by a polarity inversion such that a single matched filter may be used to detect two preamble sequences.

Abstract: A programmable digital correlator device, and associated correlation method, with a very efficient structure. In one aspect, two or more correlators share a common data sequence shift register. In another aspect, the data sequence shift register is comprised of random access memory (RAM) modules which allow efficient construction in field programmable gate array (FPGA) logic devices. Two's-complement data samples are multiplied by a reference sequence to produce unfinished two's-complement products, the products are summed with unsigned arithmetic in an adder containing population counters, and a correction factor is added after all other calculations are complete to convert the unsigned result back to a two's-complement number.

Abstract: A programmable digital correlator device, and associated correlation method, with a very efficient structure. In one aspect, two or more correlators share a common data sequence shift register. In another aspect, the data sequence shift register is comprised of random access memory (RAM) modules which allow efficient construction in field programmable gate array (FPGA) logic devices. Two's-complement data samples are multiplied by a reference sequence to produce unfinished two's-complement products, the products are summed with unsigned arithmetic in an adder containing population counters, and a correction factor is added after all other calculations are complete to convert the unsigned result back to a two's-complement number.