Method of acquiring initial synchronization in impulse wireless communication and receiver
View Patent ↗A receiver in an impulse wireless communication. The receiver ( 300 ) includes a pulse-pair correlator ( 304 ) that receives a signal ( 316 ) and divides it into two signals for paths. One of the signals is input to signal multiplier ( 312 ) while another signal is delayed by a delay unit ( 310 ). The signal multiplier ( 312 ) multiplies the received signal ( 316 ) by a delayed signal ( 318 ). An integrator ( 314 ) integrates an output signal ( 322 ) over a designated period of time. An adding module ( 306 ) sums an output signal ( 324 ) from the integrator ( 314 ). An acquiring module ( 308 ) compares an summing-up output ( 326 ) from the adding module ( 306 ) with a predetermined threshold value to detect the existence of a transmitting-standard preamble.
1. A method of acquiring initial synchronization in impulse radio communication, the method comprising:
at a transmitting apparatus:
transmitting a transmitted reference preamble to a receiving apparatus, the transmitted reference preamble being formed with a plurality of identically shaped pulse pairs that are spaced by a predetermined time separation D, each identically shaped pulse pair being separated from neighboring identically shaped pulse pairs at equal pulse pair intervals; and
transmitting a transmission data packet to the receiving apparatus after having transmitted the transmitted reference preamble to the receiving apparatus; and
at the receiving apparatus:
multiplying the transmitted reference preamble and a signal obtained by delaying the transmitted reference preamble by the predetermined time separation D, integrating a result of the multiplication per integration time that is equal to the pulse pair interval, detecting the transmitted-reference preamble based on a result of the integration, and generating a time mark; and
starting to receive the transmission data packet using the generated time mark at the receiving apparatus.
2. The method of acquiring initial synchronization according to claim 1 , wherein a pulse duration of each pulse in one of the identically shaped pulse pairs varies according to a transmission symbol.
3. A receiving apparatus comprising:
a receiving antenna that receives a transmitted-reference preamble formed with a plurality of identically shaped pulse pairs that are spaced by a predetermined time separation D, each identically shaped pulse pair being separated from neighboring identically shaped pulse pairs at equal pulse pair intervals;
a delay circuit that delays the transmitted-reference preamble received by the receiving antenna by the predetermined time separation D;
a multiplier that multiplies the transmitted-reference preamble received by the receiving antenna by the transmitted-reference preamble delayed by the delay circuit;
an integrator that integrates an output of the multiplier per integration time that is equal to the pulse pair interval;
a summing module that adds outputs of the integrator; and
an acquisition module that detects the transmitted-reference preamble by comparing an output of the summing module to a predetermined threshold, and generates a time mark.