# US 2019/0173654 A1 · Communication system and transmitter > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0173654 A1 - Document ID: US20190173654A1 - Status: Published application - Kind: A1 - Application number: 16/272,696 - Filed: 2019-02-11 - Published: 2019-06-06 - Earliest claimed: 2016-08-12 - Assignees: Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V. - Applicants: Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V. - Inventors: Frank MAYER; Rainer WANSCH - Web page: https://patentgrep.com/patent/US20190173654A1 ## CPC - H04L 5/0094: {Indication of how sub-channels of the path are allocated} - H04B 7/185: Space-based or airborne stations; {Stations for satellite systems}(H04B7/204 takes precedence) - H04B 7/18513: {Transmission in a satellite or space-based system} - H04L 5/0064: {Rate requirement of the data, e.g. scalable bandwidth, data priority} - H04L 5/0076: {Allocation utility-based} - H04L 27/2607: {Cyclic extensions} - H04W 72/0446: Resources in time domain, e.g. slots or frames - H04W 72/0453: Resources in frequency domain, e.g. a carrier in FDMA - H04W 80/02: Data link layer protocols - H04L 5/0007: {the frequencies being orthogonal, e.g. OFDM(A) or DMT} - H04L 5/1469: {using time-sharing} - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04B: TRANSMISSION - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract A communication system includes a plurality of transmitters and a receiving unit. The transmitters are configured to divide signals to be emitted into K part signals and to emit the K part signals using K sub-carriers. K is an integer. The K sub-carriers are frequency bands having a sub-carrier bandwidth and are spaced in frequency. The receiving unit is configured to receive signals emitted by the transmitters. The invention further refers to a transmitter. ## Claims ### Claim 1 Communication system, comprising a plurality of transmitters and a receiving unit, wherein the transmitters are configured to divide signals to be emitted into K part signals and to emit the K part signals using K sub-carriers, wherein K is an integer, wherein the K sub-carriers are frequency bands exhibiting a sub-carrier bandwidth, wherein the K sub-carriers are spaced in frequency, and wherein the receiving unit is configured to receive signals emitted by the transmitters. ### Claim 2 (depends on 1) Communication system of claim 1, wherein the K sub-carriers are equidistantly spaced in frequency with a sub-carrier distance. ### Claim 3 (depends on 1) Communication system of claim 1, wherein a sub-carrier of the K sub-carriers exhibiting the lowest frequency is offset to a given frequency by an individual offset, or wherein a sub-carrier of the K sub-carriers exhibiting the highest frequency is offset to a given frequency by an individual offset. ### Claim 4 (depends on 1) Communication system of claim 1, wherein each sub-carrier lies within a sub-slot, and wherein each sub-slot is a frequency band exhibiting a sub-slot bandwidth. ### Claim 5 (depends on 4) Communication system of claim 4, wherein the sub-slot bandwidth is equal to or greater than the sub-carrier bandwidth. ### Claim 6 (depends on 4) Communication system of claim 4, wherein the sub-slot bandwidth of the sub-slots is equal to or greater than the sum of the sub-carrier bandwidth of the sub-carrier and two times a guard level, and wherein the guard level is depending on a frequency error associated with the transmitters. ### Claim 7 (depends on 4) Communication system of claim 4, wherein the sub-carrier bandwidth is equal to or smaller than the sub-slot bandwidth of the sub-slots times a frequency utilization based on a probability of transmitters emitting overlapping signals. ### Claim 8 (depends on 4) Communication system of claim 4, wherein a number of sub-slots is chosen with regard to a system capacity describing a rate at which information can be reliably transmitted from the transmitters towards the receiving unit. ### Claim 9 (depends on 1) Communication system of claim 1, wherein the system bandwidth is divided into a plurality of frequency slots exhibiting slot bandwidth, and wherein each frequency slot is divided into a plurality of sub-slots. ### Claim 10 (depends on 9) Communication system of claim 9, wherein a distance between the sub-slots is based on the slot bandwidth. ### Claim 11 (depends on 1) Communication system of claim 1, wherein the central unit is configured to assign frequency slots and/or sub-slots to transmitters in order to be used for emitting the signals, and/or wherein at least one transmitter is configured to select at least one frequency slot and/or at least one sub-slot to be used for emitting the signals. ### Claim 12 (depends on 8) Communication system of claim 8, wherein a number of sub-slots is a positive integer, wherein the number of sub-slots is smaller than a maximal sub-slot number, wherein the maximal slot number is depending on the slot bandwidth divided by a guard level, and wherein the guard level is depending on a frequency error associated with the transmitters. ### Claim 13 (depends on 1) Communication system of claim 1, wherein a number of sub-slots is chosen taking a probability for overlapping signals emitted by different transmitters into account, and wherein the probability depends on a frequency utilization describing a number of transmitters emitting overlapping signals. ### Claim 14 (depends on 13) Communication system of claim 13, wherein the frequency utilization is depending on the system bandwidth, the number of sub-slots and a guard level depending on a frequency error associated with the transmitters. ### Claim 15 (depends on 8) Communication system of claim 8, wherein the number of frequency slots is set to 1, or wherein the number of frequency slots is set such that the slot bandwidth equals a given reference value, or wherein the number of frequency slots is set such that the slot bandwidth and the resulting sub-slot bandwidth facilitate calculations. ### Claim 16 Transmitter, wherein the transmitter is configured to divide a signal to be emitted into K part signals and to emit the K part signals using K sub-carriers, wherein K is an integer, and wherein the K sub-carriers are frequency bands exhibiting a sub-carrier bandwidth and are spaced in frequency. ### Claim 17 (depends on 16) Transmitter of claim 16, wherein one sub-carrier exhibits an offset to a given frequency, and wherein the offset depends on a frequency error of the transmitter with regard to the emission of signals.