TDMA communication method and apparatus using cyclic spreading codes
View Patent ↗Systems and methods of ultra-wideband communication are provided. In one embodiment, an ultra-wideband communication system divides a stream of data conveying symbols into a plurality of unspread substreams. A common spreading code is generated at the ultra-wideband transmitter, and each of the unspread substreams are spread using the common spreading code to form a plurality of spread substreams. The spread substreams are combined to form a composite signal that is transmitted. This Abstract is provided for the sole purpose of complying with the Abstract requirement rules that allow a reader to quickly ascertain the subject matter of the disclosure contained herein. This Abstract is submitted with the explicit understanding that it will not be used to interpret or to limit the scope or the meaning of the claims.
1. An ultra-wideband communication system comprising:
a plurality of transmitters configured to wirelessly transmit Time Division Multiple Access (TDMA) ultra-wideband composite signals which convey messages in adjacent radio coverage areas in accordance with a frequency reuse pattern substantially equal to one;
a plurality of ultra-wideband receivers located in the adjacent radio coverage areas wherein each receiver is configured to detect one of the messages intended for the each ultra-wideband receiver by identifying time slots assigned to each receiver;
wherein each of the ultra-wideband transmitters comprises:
a demultiplexer for dividing a TDMA stream of data-conveying symbols into a plurality of unspread substreams;
a spreading section coupled to the demultiplexer and configured to generate spread substreams from the plurality of unspread substreams, the spreading section being configured so that the spread substreams correspond to respective ones of the unspread substreams modulated by cyclic variations of a common spreading code;
a combining section coupled to the spreading section and configured to form a composite signal in response to the spread substreams;
a transmission section coupled to the combining section and configured to transmit one of the TDMA ultra-wideband composite signals; and
wherein each of the ultra-wideband receivers comprises:
a receiving section configured to receive one of the TDMA ultra-wideband composite signals; and
a despreading section coupled to the receiving section, the despreading section being configured to generate a baseband signal in response to the TDMA ultra-wideband composite signal.
2. The system of claim 1 , wherein each of the TDMA ultra-wideband composite signals comprises a plurality of discrete electromagnetic pulses, with each pulse having a duration that can range between about 10 picoseconds to about 1 microsecond.
3. The system of claim 2 , wherein each discrete electromagnetic pulse has a power that can range between about +30 dBm to about −60 dBm, as measured at a single frequency.