Patent ID: 11942981
Assignee: MITSUBISHI ELECTRIC CORPORATION
Field: Telecommunications (Electrical engineering)
Classification: CPC H | IPC H

Claim 8:
9. A communication system comprising:
the receiver according to claim 2; and
any one of
a transmitter comprising:
chirp spread circuitry to spread a data signal with a chirp that is a spread code;
a preamble generator to spread a known signal with an up chirp that is a spread code whose frequency increases with time and a down chirp that is a spread code whose frequency decreases with time; and
a frame generator to frame a data block that is spread and generated by the chirp spread circuitry and a preamble block that is spread and generated by the preamble generator,

a transmitter comprising:
chirp spread circuitry to spread a data signal with a chirp that is a spread code;
a preamble generator to spread a known signal with an up chirp that is a spread code whose frequency increases with time and a down chirp that is a spread code whose frequency decreases with time; and
a frame generator to frame a data block that is spread and generated by the chirp spread circuitry and a preamble block that is spread and generated by the preamble generator,
wherein the preamble generator spreads a first half of the preamble block with one of the up chirp or the down chirp, and spreads a second half of the preamble block with another one of the up chirp or the down chirp, or

a transmitter comprising:
chirp spread circuitry to spread a data signal with a chirp that is a spread code;
a preamble generator to spread a known signal with an up chirp that is a spread code whose frequency increases with time and a down chirp that is a spread code whose frequency decreases with time; and
a frame generator to frame a data block that is spread and generated by the chirp spread circuitry and a preamble block that is spread and generated by the preamble generator, wherein
the preamble generator divides the preamble block into a plurality of blocks, and alternately arranges a block spread with the up chirp and a block spread with the down chirp.