초록 ▼

A time division multiplexed wireless communication system using the DECT protocol with spread-spectrum modulation. The wireless communication system includes a spread-spectrum transmitter and receiver. The spread spectrum transmitter transmits using an M-ary spread spectrum transmission technique, s

A time division multiplexed wireless communication system using the DECT protocol with spread-spectrum modulation. The wireless communication system includes a spread-spectrum transmitter and receiver. The spread spectrum transmitter transmits using an M-ary spread spectrum transmission technique, sending a predefined chip code (symbol code) for each data symbol. The predefined chip codes used are relatively short, so that spread spectrum synchronization is accomplished within about a single data symbol transmission time, well within the constraints of the DECT timing structure. The spread spectrum signal may be transmitted over a bandwidth of under 20 MHz (e.g., about 5 MHz) covering a plurality of DECT frequency channels, so as to be confined within, or overlapping with, the bandwidth of a DECT system, and so as to minimize interference with other users, if any, of the same frequency spectrum. A spread spectrum transmission in a DECT time slot may overlay one or more narrowband transmissions, or may overlay other spread spectrum transmissions. Code division multiplexing may also be used to allow multiple spread spectrum transmissions to be sent during a single DECT time slot.

대표청구항 ▼

[ What is claimed is:] [25.]25. A communication system comprising:a spread spectrum transmitter operably coupled to a first interface, said first interface operably coupled to a Digital European Cordless Telecommunications System (DECT) Medium Access Control (MAC) layer;a spread spectrum correlator

[ What is claimed is:] [25.]25. A communication system comprising:a spread spectrum transmitter operably coupled to a first interface, said first interface operably coupled to a Digital European Cordless Telecommunications System (DECT) Medium Access Control (MAC) layer;a spread spectrum correlator operably coupled to a second interface, said second interface operably coupled to said MAC layer;wherein said first interface converts a DECT data stream received from said MAC layer, said DECT data stream being formatted in accordance with the DECT time slot and DECT time frame structure, to a binary data stream provided to said spread spectrum transmitter;said spread spectrum transmitter generating a spread spectrum signal in response to said binary data stream by modulating said binary data stream with a chip stream output of a chip sequence transmitter generator, said spread spectrum transmitter thereby capable of transmitting said spread spectrum signal in a rapid synchronization manner for providing synchronization within DECT system timing constraints;said spread spectrum correlator capable of receiving and despreading said spread spectrum signal and generating said binary data stream in response thereto, said spread spectrum correlator further configured to correlate and despread said spread spectrum signal in a rapid synchronization manner for providing synchronization within DECT system timing constraints;wherein said second interface converts said binary data stream received from said spread spectrum correlator to said DECT data stream provided to said MAC layer; andwherein said first interface and said second interface permits said MAC layer to function independently from said spread spectrum correlator and said spread spectrum transmitter.