초록 ▼

A method and apparatus for receiving and transmitting direct sequence spread spectrum signals uses a single integrated device for converting and demodulating an RF signal into a serial data signal. Critical timing relationships during the acquisition and demodulation of the received signal are satis

A method and apparatus for receiving and transmitting direct sequence spread spectrum signals uses a single integrated device for converting and demodulating an RF signal into a serial data signal. Critical timing relationships during the acquisition and demodulation of the received signal are satisfied by the use of an integrated circuit specially designed to perform all operations needed to convert the physical signal to an media access circuit level data signal.

대표청구항 ▼

[ What is claimed is:] [1.] A circuit for detecting a message header in a signal which has been transmitted using direct sequence spread spectrum modulation, comprising a single device having:means for receiving an analog signal having modulated thereon in a spread spectrum format a message having a

[ What is claimed is:] [1.] A circuit for detecting a message header in a signal which has been transmitted using direct sequence spread spectrum modulation, comprising a single device having:means for receiving an analog signal having modulated thereon in a spread spectrum format a message having a header portion and a data portion;means for converting said analog signal into a digital signal;means for demodulating the header of the digital signal using digital binary phase shift keyed (BPSK) demodulation and for demodulating the data portion of the same message using quarterary phase shift keyed demodulation (QPSK);means contained on said single device for timing a transition from BPSK mosulation to QPSK modulation; and,means for providing the demodulated data signal to a media access control (MAC) layer.