Communication using analog pulses having exponentially-shaped leading edges

摘要

A first transmitter transmits symbols. The leading edge of each symbol has the form Djexp{αjt}, where Dj is real, where αj is selected from N possible values based on a current group of bits. The receiver has N filters whose transfer functions correspond respectively to the N possible values. The filter outputs are used to recover the group of bits. A second transmitter transmits an exponential symbol or a zero symbol depending on a current bit to be transmitted. The zero symbol has zero amplitude over the symbol period. The corresponding receiver applies threshold detection to estimate the transmitted bits. A third transmitter transmits a sequence of analog pulses with known interpulse time separation(s). The pulse sequence reflects from a moving object. A receiver captures the reflected pulse sequence. The interpulse separation(s) of the reflect pulse sequence is used to determine the radial velocity of the object.

主权项

1. A method for transmitting information, the method comprising:
receiving a sequence of bits; generating a communication signal including a sequence of transmit symbols, wherein each transmit symbol of the sequence of transmit symbols has a symbol duration and is selected from a symbol set based on a value of a respective bit of the sequence of bits, wherein the symbol set includes a zero symbol and an exponential symbol, wherein the zero symbol has zero voltage over the symbol duration, wherein the exponential symbol is an analog pulse whose leading edge is of exponential shape with exponential growth parameter being positive, wherein said generating is performed by a signal generator circuit; and transmitting the communication signal onto a communication medium, wherein said transmitting is performed by a transmitter.