# US 2002/0172262 A1 · Wireless communication system using an impules signal train, a wireless transmission apparatus, a wireless reception apparatus, a wireless transmission method, and a wireless reception method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2002/0172262 A1 - Document ID: US20020172262A1 - Status: Published application - Kind: A1 - Application number: 10/138,100 - Filed: 2002-05-02 - Published: 2002-11-21 - Earliest claimed: 2001-05-08 - Assignees: Sony Corporation - Inventors: Shigeru Sugaya; Jun Iwasaki - Web page: https://patentgrep.com/patent/US20020172262A1 ## CPC - H04W 28/22: Negotiating communication rate - H04B 1/7183: Synchronisation - H04B 1/7176: Data mapping, e.g. modulation - H04B 1/719: Interference-related aspects - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04B: TRANSMISSION ## Abstract A wireless communication system performs high-speed and low-speed transmission of information signals for short-distance communication and long-distance communication by using a short spread code and a long spread code, respectively. A wireless transmission unit includes an interface, a buffer, a spreading processor, a UWB wireless transmitter, a controller, a data memory, and an antenna. The controller detects the entry of information signal into the buffer, and then determines the transmission rate depending on the state of wireless linkage and indicates the determined transmission rate to the spreading processor. ## Claims ### Claim 1 A wireless transmission system based on spread-spectrum communication, said system having its information bit spreading factor varied depending on the distance of linkage between an information sending station and an information receiving station or depending on the characteristics of a transmission path. ### Claim 2 (depends on 1) A wireless transmission system according to claim 1, wherein said spread-spectrum communication comprises ultra wide band communication. ### Claim 3 A wireless transmission system formed of a plurality of communication stations and based on spread-spectrum communication, an information sending station sending a data transmission request to an information receiving station, said receiving station evaluating the number of times of integration process for the received signal of data transmission request by which the integration result reaches a predetermined threshold value, and sending data of the evaluated number of times of integration to said sending station, said sending station implementing information transmission based on the evaluated number of times of integration. ### Claim 4 A wireless transmission system formed of a plurality of communication stations and based on spread-spectrum communication, an information sending station sending a data transmission request to an information receiving station, said receiving station evaluating the number of times of integration process for the received signal of data transmission request by which the integration result reaches a predetermined threshold value, and sending a band reservation request inclusive of data of the evaluated number of times of integration to a control station, said control station, if band reservation is possible, sending back data of band assignment in response to the reception of the band reservation request, said sending station and said receiving station implementing information transmission based on the evaluated number of times of integration by using the assigned band. ### Claim 5 A wireless communication system for sending an information signal from a sending station to a receiving station by using an impulse signal train, said sending station implementing the spreading process for an information signal by using a spread code which is produced based on a unit spread code, producing an impulse signal train from a spread signal resulting from the spreading process, and transmitting the impulse signal train, said receiving station receiving the impulse signal train, implementing the de-spreading process for the impulse signal train by using a unit de-spread code, and implementing the integration process a certain number of times for a de-spread signal resulting from the de-spreading process thereby to reproduce the information signal. ### Claim 6 (depends on 5) A wireless communication system according to claim 5, wherein the information signal has a bit span of T and the unit spread code has a code length of S which are related to be T=N X, where N is a positive number. ### Claim 7 (depends on 6) A wireless communication system according to claim 6, wherein the number of times of integration is N. ### Claim 8 (depends on 5) A wireless communication system according to claim 5, wherein the information signal has a bit span of T and the unit spread code has a code length of S which are related to be T=S/N, where N is a positive number. ### Claim 9 (depends on 8) A wireless communication system according to claim 8, wherein the number of times of integration is 1/N. ### Claim 10 A wireless communication system using an impulse signal train, said system being capable of performing selectively communication at a nominal transmission rate and communication at a transmission rate lower than the nominal transmission rate, said system performing communication at the nominal transmission rate by using a unit spread code and an information signal having a bit span that is equal to the code length of the unit spread code, and performing communication at the lower transmission rate by using the unit spread code and an information signal having a bit span that is a multiple of the code length of the unit spread code. ### Claim 11 A wireless communication system using an impulse signal train, said system being capable of performing selectively communication at a nominal transmission rate and communication at a transmission rate higher than the nominal transmission rate, said system performing communication at the nominal transmission rate by using a unit spread code and an information signal having a bit span that is equal to the code length of the unit spread code, and performing communication at the higher transmission rate by using a unit spread code and an information signal having a bit span that is a fraction of the code length of the unit spread code. ### Claim 12 A wireless transmission apparatus comprising: a spread processor which implements the spreading process for information bits; a wireless spread-spectrum transmitter/receiver which receives parameter data including spreading factor; and a controller which controls said spread processor based on the received spreading factor. ### Claim 13 (depends on 12) A wireless transmission apparatus according to claim 12, wherein said wireless spread-spectrum transmitter/receiver is based on a ultra wide band communication scheme. ### Claim 14 A wireless transmission apparatus comprising: an integration processor which implements the integration process for a data signal of a data transmission request; and a controller which operates on said integration processor to evaluate the number of times of integration, and operates on a wireless spread-spectrum transmitter/receiver to transmit data of the evaluated number of times of integration; said controller, on receiving data which is transmitted with the spreading factor derived from the number of times of integration, operates on said integration processor to implement the integration process by the evaluated number of times of integration thereby to reproduce information bits. ### Claim 15 (depends on 14) A wireless transmission apparatus according to claim 14, wherein said wireless spread-spectrum transmitter/receiver is based on a ultra wide band communication scheme. ### Claim 16 A wireless transmission apparatus which performs communication by using an impulse signal train, said apparatus comprising: a spread processor which implements the spreading process for an information signal by using a spread code which is produced based on a unit spread code; and a wireless transmitter/receiver which produces an impulse signal train from a spread signal resulting from the spreading process. ### Claim 17 (depends on 16) A wireless transmission apparatus according to claim 16, wherein the information signal has a bit span that is N times or 1/N time the code length of the unit spread code, where N is a positive number. ### Claim 18 A wireless reception apparatus which performs communication by using an impulse signal train, said apparatus comprising: a wireless transmitter/receiver which receives an impulse signal train and implements the de-spreading process for the impulse signal train by using a unit de-spread code; and an integration processor which implements the integration process a certain number of times for a de-spread signal resulting from the de-spreading process. ### Claim 19 (depends on 18) A wireless reception apparatus according to claim 18, wherein the number of times of integration is N or 1/N, where N is a positive number. ### Claim 20 A method of wireless transmission comprising the steps of: transmitting a data transmission request; evaluating the number of times of integration process for the received signal of data transmission request by which the integration result reaches a predetermined threshold value, and sending parameter data including the evaluated number of times of integration in response to the data transmission request; receiving the parameter data including the number of times of integration, and determining a spreading factor based on the number of times of integration; and spreading information bits with the determined spreading factor, and transmitting the spread information bits. ### Claim 21 (depends on 20) A wireless transmission method according to claim 20, wherein said signal of data transmission request is a signal which has been spread with a known spreading factor. ### Claim 22 A method of wireless transmission comprising the steps of: receiving a spread signal which has been spread with a spread code series derived from N-time repetition of a certain spread code; integrating a de-spread signal resulting from multiplication of the spread code to the received signal, and evaluating the number of times of integration process by which the integration result reaches a predetermined threshold value; indicating the evaluated number of times of integration to the sending party of transmission; and implementing the integration process by the number of times of integration for a radio wave signal which is sent in response to the indication. ### Claim 23 A method of wireless communication for sending an information signal from a sending station to a receiving station by using an impulse signal train, said method comprising: a sending operation of implementing the spreading process for an information signal by using a spread code which is produced based on a unit spread code, producing an impulse signal train from a spread signal resulting from the spreading process, and transmitting the impulse signal train; and a receiving operation of receiving the impulse signal train, implementing the de-spreading process for the impulse signal train by using a unit de-spread code, and implementing the integration process a certain number of times for a de-spread signal resulting from the de-spreading process thereby to reproduce the information signal. ### Claim 24 (depends on 23) A wireless communication method according to claim 23, wherein the information signal has a bit span of T and the unit spread code has a code length of S which are related to be T=N X, where N is a positive number. ### Claim 25 (depends on 24) A wireless communication method according to claim 24, wherein the number of times of integration is N. ### Claim 26 (depends on 23) A wireless communication method according to claim 23, wherein the information signal has a bit span of T and the unit spread code has a code length of S which are related to be T=S/N, where N is a positive number. ### Claim 27 (depends on 26) A wireless communication method according to claim 26, wherein the number of times of integration is 1/N. ### Claim 28 A method of wireless communication using an impulse signal train and performing selectively communication at a nominal transmission rate and communication at a transmission rate lower than the nominal transmission rate, said method comprising the operations of: performing communication at the nominal transmission rate by using a unit spread code and an information signal having a bit span that is equal to the code length of the unit spread code; and performing communication at the lower transmission rate by using the unit spread code and an information signal having a bit span that is a multiple of the code length of the unit spread code. ### Claim 29 A method of wireless communication using an impulse signal train and performing selectively communication at a nominal transmission rate and communication at a transmission rate higher than the nominal transmission rate, said method comprising the operations of: performing communication at the nominal transmission rate by using a unit spread code and an information signal having a bit span that is equal to the code length of the unit spread code; and performing communication at the higher transmission rate by using the unit spread code and an information signal having a bit span that is a fraction of the code length of the unit spread code. ### Claim 30 A method of wireless transmission using an impulse signal train, said method comprising the operations of: implementing the spreading process for an information signal by using a spread code which is produced based on a unit spread code; producing an impulse signal train from a spread signal resulting from the spreading process; and transmitting the impulse signal train. ### Claim 31 (depends on 30) A wireless communication method according to claim 30, wherein the information signal has a bit span that is N times or 1/N time the code length of the unit spread code, where N is a positive number. ### Claim 32 A method of wireless reception using an impulse signal train, said method comprising the operations of: receiving an impulse signal train; implementing the de-spreading process for the impulse signal train by using a unit de-spread code; and implementing the integration process a certain number of times for a de-spread signal resulting from the de-spreading process. ### Claim 33 (depends on 32) A wireless reception method according to claim 32, wherein the number of times of integration is N or 1/N, where N is a positive number. ### Claim 34 (depends on 32) A wireless reception method according to claim 32, wherein the received impulse signal train is derived from multiplication of the unit spread code to an information signal having a bit span that is N times the code length of the unit spread code, and the number of times of integration is N. ### Claim 35 In a wireless transmission apparatus including a spread processor which implements the spread process for information bits, a wireless spread-spectrum transmitter/receiver which converts the spread information bits into a radio wave signal, and controller which controls said spread processor and said wireless spread-spectrum transmitter/receiver, a program for operating a computation means to function as said controller comprises the steps of: operating on said wireless spread-spectrum transmitter/receiver to transmit a data transmission request; operating on said wireless spread-spectrum transmitter/receiver to receive parameter data including the number of times of integration process sent back in response to the data transmission request; determining a spreading factor based on the number of times of integration included in the parameter data; and operating on said spread processor to spread information bits with the spreading factor. ### Claim 36 (depends on 35) A program according to claim 35, wherein said wireless spread-spectrum transmitter/receiver is based on a ultra wide band communication scheme. ### Claim 37 In a wireless transmission apparatus including a wireless spread-spectrum transmitter/receiver which receives a signal which has been spread with a spread code series derived from N-time repetition of a certain spread code and retrieves a de-spread signal from the received signal, an integration processor which implements the integration process for the de-spread signal, and controller which controls said wireless spread-spectrum transmitter/receiver and said integration processor, a program for operating a computation means to function as said controller comprises the steps of: operating on said wireless spread-spectrum transmitter/receiver to multiply a certain spread code to the received signal thereby to retrieve a de-spread signal; operating on said integration processor to evaluate the number of times of integration by which the integration result for the de-spread signal reaches a predetermined threshold value; operating on said wireless spread-spectrum transmitter/receiver to transmit indication data including the evaluated number of times of integration; and operating on said integration processor to integrate, by the evaluated number of times of integration, the de-spread signal carried by a radio wave signal which is transmitted in response to the transmission of indication data. ### Claim 38 (depends on 37) A program according to claim 37, wherein said wireless spread-spectrum transmitter/receiver is based on a ultra wide band communication scheme.