# US 2008/0304590 A1 · Method and apparatus for transmission from multiple non-collocated base stations over wireless radio networks > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2008/0304590 A1 - Document ID: US20080304590A1 - Status: Published application - Kind: A1 - Application number: 12/130,821 - Filed: 2008-05-30 - Published: 2008-12-11 - Earliest claimed: 2007-06-06 - Inventors: Carl-Erik W. Sundberg; Haralabos Papadopoulos - Web page: https://patentgrep.com/patent/US20080304590A1 ## CPC - H04L 27/2607: {Cyclic extensions} - H04L 1/005: {Iterative decoding, including iteration between signal detection and decoding operation} - H04L 1/0059: {Convolutional codes} - H04L 1/0065: {Serial concatenated codes} - H04L 1/0071: {Use of interleaving (interleaving per se H03M13/27)} - H04L 1/0618: {Space-time coding} - H04L 5/003: {Arrangements for allocating sub-channels of the transmission path} - H04L 5/0035: {Resource allocation in a cooperative multipoint environment} - H04L 5/0023: {Time-frequency-space} - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract A method and apparatus is disclosed herein for wireless transmission from multiple non-colocated antennas. In one embodiment, a wireless communication system comprises a controller to control a set of antenna elements dispersed over multiple, non-collocated base stations to wirelessly transmit information-bearing signals to one or more receivers using OFDM transmission, wherein control unit includes an antenna selection control operable to select non-collocated antenna elements from the set of antenna elements to send at least one signal to a receiver in the wireless communication system from antenna elements located at different base stations, and further wherein the OFDM transmission uses a circular prefix long enough to accommodate a maximum possible relative delay in reception between arrivals of the transmitted signals. ## Claims ### Claim 1 A wireless communication system comprising: a controller to control a set of antenna elements dispersed over multiple, non-collocated base stations to wirelessly transmit information-bearing signals to one or more receivers using OFDM transmission, wherein control unit includes an antenna selection control operable to select non-collocated antenna elements from the set of antenna elements to send at least one signal to a receiver in the wireless communication system from antenna elements located at different base stations, and further wherein the OFDM transmission occurs with use of a circular prefix long enough to accommodate a maximum possible relative delay in reception between transmission from the antenna elements located at the different base stations. ### Claim 2 (depends on 1) The wireless communication system defined in claim 1 wherein the antenna selection control of the controller selects antenna elements from the set of antenna elements based on channel condition information with respect to wireless transmission to the receiver. ### Claim 3 (depends on 2) The wireless communication system defined in claim 2 wherein the antenna selection control of the controller selects antenna elements from the set of antenna elements based on desired data rate and desired diversity with respect to wireless transmission to the receiver. ### Claim 4 (depends on 2) The wireless communication system defined in claim 2 wherein the channel condition information comprises signal strength information corresponding to signals received by the receiver that is provided to the controller from one or more of the base stations. ### Claim 5 (depends on 2) The wireless communication system defined in claim 2 wherein the channel condition information comprises signal-to-noise ratio (SNR) information corresponding to signals received by the receiver that is provided to the controller from one or more of the base stations. ### Claim 6 (depends on 2) The wireless communication system defined in claim 2 wherein the antenna selection control of the controller selects antenna elements from the set of antenna elements based on channel condition information with respect to wireless transmission to one or more other receivers in the wireless communication system. ### Claim 7 (depends on 6) The wireless communication system defined in claim 6 wherein the antenna selection control of the controller selects antenna elements from the set of antenna elements jointly for the receiver and at least one of the one or more other receivers. ### Claim 8 (depends on 1) The wireless communication system defined in claim 1 wherein the non-collocated base stations wirelessly transmit the information-bearing signals using an outer binary convolutional code that is based on bit-interleaved coded modulation. ### Claim 9 (depends on 8) The wireless communication system defined in claim 8 wherein the outer binary convolutional code that is based on bit-interleaved coded modulation is combined with OFDM transmission. ### Claim 10 (depends on 1) The wireless communication system defined in claim 1 further comprising a transmitter to send information-bearing signals to the receiver wirelessly using a space-time encoding system comprising: an outer binary code; a bit interleaver; and a modem and a mapper combined with an OFDM transmission system. ### Claim 11 (depends on 10) The wireless communication system defined in claim 10 wherein the outer binary code is a rate-compatible punctured convolutional (RCPC) outer code. ### Claim 12 (depends on 10) The wireless communication system defined in claim 10 wherein the outer binary code is a LDPC code. ### Claim 13 (depends on 10) The wireless communication system defined in claim 10 wherein the outer binary code is a turbo code. ### Claim 14 (depends on 10) The wireless communication system defined in claim 10 wherein the receiver comprises: a demapper having a soft output joint demapping unit for each subchannel in the OFDM system; a deinterleaver communicably coupled to the demapper; and an outer decoder of MAP type for the outer binary code. ### Claim 15 A method comprising: receiving channel condition information with respect to wireless transmission to a receiver in a wireless communication system having a set of antenna elements dispersed over multiple, non-collocated base stations to wirelessly transmit information-bearing signals to one or more receivers using OFDM transmission; selecting non-collocated antenna elements from the set of antenna elements to send at least one signal to a receiver in the wireless communication system from antenna elements located at different base stations; using a circular prefix in the OFDM transmission long enough to accommodate a maximum possible relative delay in reception between transmission from the antenna elements located at the different base stations; and matching signal elements to the transmit antennas at one or more base stations ### Claim 16 (depends on 15) The method defined in claim 15 wherein selecting non-collocated antenna elements is based on one or more of a group consisting of desired data rate and/or desired diversity, both with respect to wireless transmission to the receiver. ### Claim 17 (depends on 15) The method defined in claim 15 wherein the channel condition information comprises signal strength information corresponding to signals received by the receiver that is provided from one or more of the base stations. ### Claim 18 (depends on 15) The method defined in claim 15 wherein the channel condition information comprises signal-to-noise ratio (SNR) information corresponding to signals received by the receiver that is provided from one or more of the base stations. ### Claim 19 (depends on 15) The method defined in claim 15 wherein selecting antenna elements from the set of antenna elements is based on the channel condition information with respect to wireless transmission to a plurality of receivers in the wireless communication system including the receiver. ### Claim 20 (depends on 19) The method defined in claim 19 wherein selecting antenna elements from the set of antenna elements comprises jointly selecting antenna elements from the set of antenna elements for the receiver and at least one of the one or more other receivers based on the channel condition information. ### Claim 21 (depends on 15) The method defined in claim 15 wherein the non-collocated base stations wirelessly transmit the information-bearing signals using an outer binary convolutional code that is based on bit-interleaved coded modulation. ### Claim 22 (depends on 21) The method defined in claim 21 wherein the outer binary convolutional code that is based on bit-interleaved coded modulation is combined with OFDM transmission. ### Claim 23 (depends on 22) The method defined in claim 22 wherein the outer binary code is a rate-compatible punctured convolutional (RCPC) outer code. ### Claim 24 (depends on 22) The method defined in claim 22 wherein the outer binary code is a LDPC code. ### Claim 25 (depends on 22) The method defined in claim 22 wherein the outer binary code is a turbo code.