# US 7,609,790 B2 · Joint signal demodulation in a low and high data rate channel environment > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,609,790 B2 - Document ID: US7609790B2 - Status: Granted - Kind: B2 - Application number: 11/149,508 - Filed: 2005-06-10 - Published: 2005-12-15 - Granted: 2009-10-27 - Earliest claimed: 2004-06-10 - Assignees: InterDigital Technology Corporation - Inventors: Yogendra Shah - Web page: https://patentgrep.com/patent/US7609790B2 ## CPC - H04B 1/7107: Subtractive interference cancellation - H04L 25/0262: {Arrangements for detecting the data rate of an incoming signal} - H04B 1/71072: {Successive interference cancellation} - H04B: TRANSMISSION - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract A receiver is capable of demodulating both high data rate and low data rate transmissions. An antenna receives the high and low data rate transmissions, as a received signal. An interference canceling device cancels a contribution of at least one shared/common channel from the received signal, producing a first interference canceled signal. A first data detector for detecting data of one of the high or low data rate transmissions by processing the first interference canceled signal. An interference canceling device for canceling the detected data of the one transmissions from the first interference canceled signal, producing a second interference canceled signal. A second data detector for detecting data of an other of the high or low data rate transmissions from the second interference canceled signal. ## Claims ### Claim 1 A receiver configured to receive a wireless data transmission, the data transmission comprising a low data rate transmission and a high data rate transmission, comprising: an antenna configured to receive the wireless data transmission as a received vector; a common/shared channel interference canceller configured to cancel data from at least one shared channel from the received vector to produce an interference cancelled vector; a downlink physical channel (DPCH) data detector configured to detect the low data rate transmission in the interference cancelled vector; a DPCH interference canceller configured to subtract the contribution of the low data rate transmission from the interference cancelled vector to produce a DPCH cancelled vector; a high speed downlink packet access (HSDPA) data detector configured to detect the high data rate transmission from the DPCH cancelled vector. ### Claim 2 (depends on 1) The receiver of claim 1 wherein the antenna is further configured to receive a plurality of low data rate transmissions, wherein each of the plurality of low data rate transmissions is received from one of a plurality of cells. ### Claim 3 (depends on 2) The receiver of claim 2 further comprising: a combiner configured to combine a plurality of received low data rate transmissions received from a plurality of cells. ### Claim 4 (depends on 1) The receiver of claim 1, wherein the common/shared channel interference canceller is configured to detect at least one of: a page indicator channel (PICH), common pilot channel (CPICH), primary common control physical channel (P-CCPCH), secondary common control physical channel (S-CCPCH) and a high speed shared control channel (HS-SCCH). ### Claim 5 (depends on 1) The receiver of claim 1 wherein the wireless data transmission is a CDMA2000 data transmission and the low data rate transmission is a dedicated channel transmission and the high data rate transmission is a forward packet data channel (F-PDCH) transmission. ### Claim 6 (depends on 5) The receiver of claim 5 wherein the common/shared interference canceller is configured to detect at least one of: a pilot channel, synchronization channel, paging channel, broadcast control channel, forward common control channel, common assignment channel and forward dedicated control channel. ### Claim 7 (depends on 1) The receiver of claim 1 configured for use in a wireless transmit/receive unit. ### Claim 8 (depends on 1) The receiver of claim 1 configured for use in a base station. ### Claim 9 A method to detect low data rate transmissions in a wireless data transmission, the data transmission comprising a low data rate transmission and a high data rate transmission, the method comprising: receiving the wireless data transmission as a received vector; detecting data from at least one common or shared channel; subtracting the contribution of the at least one common or shared channel from the received vector to produce an interference cancelled vector; detecting the low data rate transmission in the interference cancelled vector; subtracting, in a common/shared channel interference canceller, the contribution of the low data rate transmission from the interference cancelled vector to produce a DPCH interference cancelled vector; detecting the high data rate transmission from the DPCH interference cancelled vector. ### Claim 10 (depends on 9) The method of claim 9, further comprising: receiving a plurality of low data rate transmissions, where each of the plurality of low data rate transmissions is received from one of a plurality of cells; and combining the plurality of received low data rate transmissions received from a plurality of cells. ### Claim 11 (depends on 9) The method of claim 9, wherein detecting data from at least one common or shared channel comprises detecting at least one of a page indicator channel (PICH), a common pilot channel (CPICH), a primary common control physical channel (P-CCPCH), a secondary common control physical channel (S-CCPCH) and a high speed-shared control channel (HS-SCCH). ### Claim 12 (depends on 9) The method of claim 9, wherein the wireless data transmission is a CDMA2000 data transmission, and the low data rate transmission is a dedicated channel (DCH) transmission and the high data rate transmission is a forward packet data channel (F-PDCH) transmission. ### Claim 13 (depends on 12) The method of claim 12, wherein detecting data from at least one common or shared channel comprises detecting at least one of: a pilot channel, a synchronization channel, a paging channel, a broadcast channel, a forward common control channel, a common assignment channel, and a forward dedicated control channel.