# US 11,452,174 B2 · Signal processing method and related device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,452,174 B2 - Document ID: US11452174B2 - Status: Granted - Kind: B2 - Application number: 16/905,434 - Filed: 2020-06-18 - Published: 2020-12-31 - Granted: 2022-09-20 - Earliest claimed: 2019-06-25 - Assignees: Huawei Technologies Co., Ltd. - Applicants: Huawei Technologies Co., Ltd. - Inventors: Sheng Liu - Web page: https://patentgrep.com/patent/US11452174B2 ## CPC - H04W 88/085: {Access point devices with remote components} - H04B 1/0475: {with means for limiting noise, interference or distortion (H04B1/0483 takes precedence)} - H04B 1/28: the receiver comprising at least one semiconductor device having three or more electrodes - H04B 1/40: Circuits - H04B 7/024: Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems - H04B 10/25753: {Distribution optical network, e.g. between a base station and a plurality of remote units} - 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 signal processing method and a related device, where the signal processing method may be applicable to the field of signal transmission between a baseband processing apparatus and a radio frequency apparatus of an access network device. The baseband processing apparatus obtains at least two first downlink digital baseband signals, multiplexes the at least two first downlink digital baseband signals into one second downlink digital baseband signal, and after converting the second downlink digital baseband signal into a first downlink analog baseband signal, sends the first downlink analog baseband signal to the radio frequency apparatus. The radio frequency apparatus demultiplexes the first downlink analog baseband signal, and generates, based on at least two second downlink analog baseband signals obtained by demultiplexing, a downlink radio frequency signal to be sent to a terminal device. ## Claims ### Claim 1 A signal processing method implemented by a radio access device comprising a baseband processing apparatus and a radio frequency apparatus, wherein the signal processing method comprises: obtaining, by the baseband processing apparatus, a plurality of first downlink digital baseband signals; multiplexing, by the baseband processing apparatus, the first downlink digital baseband signals into a second downlink digital baseband signal; obtaining, by the baseband processing apparatus, a downlink carrier corresponding to the first downlink digital baseband signals; converting, by the baseband processing apparatus, the second downlink digital baseband signal into a first downlink analog baseband signal; combining, by the baseband processing apparatus, the downlink carrier and the first downlink analog baseband signal to obtain a combined downlink carrier signal; sending, by the baseband processing apparatus, the combined downlink carrier signal to the radio frequency apparatus, wherein the downlink carrier enables the radio frequency apparatus to perform up-conversion frequency mixing on a plurality of second downlink analog baseband signals and the downlink carrier to generate a downlink radio frequency signal to be sent to a terminal device; receiving, by the radio frequency apparatus, the combined downlink carrier signal from the baseband processing apparatus; demultiplexing, by the radio frequency apparatus, the first downlink analog baseband signal to obtain the second downlink analog baseband signals; and generating, by the radio frequency apparatus based on the second downlink analog baseband signals, the downlink radio frequency signal to be sent to the terminal device. ### Claim 2 (depends on 1) The signal processing method of claim 1, further comprising: obtaining, by the baseband processing apparatus, a sampling clock signal; and further combining, by the baseband processing apparatus, the downlink carrier, the first downlink analog baseband signal, and the sampling clock signal to obtain the combined downlink carrier signal, wherein the sampling clock signal enables the radio frequency apparatus to generate a first timing control signal for demultiplexing the first downlink analog baseband signal. ### Claim 3 (depends on 1) The signal processing method of claim 1, further comprising: splitting, by the radio frequency apparatus, the combined downlink carrier signal; and performing, by the radio frequency apparatus, the up-conversion frequency mixing on the second downlink analog baseband signals and the downlink carrier to generate the downlink radio frequency signal to be sent to the terminal device. ### Claim 4 (depends on 2) The signal processing method of claim 2, further comprising: splitting, by the radio frequency apparatus, the combined downlink carrier signal; generating, by the radio frequency apparatus, the first timing control signal based on the sampling clock signal; and further demultiplexing, by the radio frequency apparatus, the first downlink analog baseband signal using the first timing control signal. ### Claim 5 (depends on 1) The signal processing method of claim 1, wherein the downlink carrier has a frequency of about 1.8 gigahertz (GHz). ### Claim 6 A signal processing method implemented by a radio access device comprising a radio frequency apparatus and a baseband processing apparatus, wherein the signal processing method comprises: receiving, by the radio frequency apparatus, a plurality of uplink radio frequency signals from a terminal device; receiving, by the radio frequency apparatus, an uplink frequency mixing signal from the baseband processing apparatus; performing, by the radio frequency apparatus, down-conversion frequency mixing on the uplink radio frequency signals and the uplink frequency mixing signal to obtain a plurality of first uplink analog signals; multiplexing, by the radio frequency apparatus, the first uplink analog signals into a second uplink analog signal; sending, by the radio frequency apparatus, the second uplink analog signal to the baseband processing apparatus; receiving, by the baseband processing apparatus, the second uplink analog signal sent by the radio frequency apparatus; converting, by the baseband processing apparatus, the second uplink analog signal into a first uplink digital signal; and demultiplexing, by the baseband processing apparatus, the first uplink digital signal, to obtain a plurality of second uplink digital signals. ### Claim 7 (depends on 6) The signal processing method of claim 6, further comprising: receiving, by the radio frequency apparatus, a sampling clock signal from the baseband processing apparatus; generating, by the radio frequency apparatus, a second timing control signal based on the sampling clock signal; and further multiplexing, by the radio frequency apparatus, the first uplink analog signals into the second uplink analog signal using the second timing control signal. ### Claim 8 (depends on 6) The signal processing method of claim 6, further comprising sending, by the baseband processing apparatus, the uplink frequency mixing signal to the radio frequency apparatus, wherein the uplink frequency mixing signal enables the radio frequency apparatus to perform the down-conversion frequency mixing. ### Claim 9 (depends on 6) The signal processing method of claim 6, further comprising sending, by the baseband processing apparatus, a sampling clock signal to the radio frequency apparatus, wherein the sampling clock signal enables the radio frequency apparatus to generate a second timing control signal for multiplexing the first uplink analog signals. ### Claim 10 (depends on 6) The signal processing method of claim 6, wherein the uplink frequency mixing signal has a frequency of about 2.4 gigahertz (GHz). ### Claim 11 A radio access device comprising: a baseband processing apparatus comprising: a baseband part configured to obtain a plurality of first downlink digital baseband signals; a multiplexing system coupled to the baseband part and configured to multiplex the first downlink digital baseband signals into a second downlink digital baseband signal; a frequency generator configured to generate a sampling clock signal; a digital-to-analog converter (DAC) coupled to the multiplexing system and configured to convert the second downlink digital baseband signal from the multiplexing system into a first downlink analog baseband signal; a combiner coupled to the frequency generator and the DAC and configured to combine the sampling clock signal with the first downlink analog baseband signal to obtain a combined sampling clock signal; and a first output interface configured to send the combined sampling clock signal, wherein the sampling dock signal enables generation of a first timing control signal for demultiplexing the first downlink analog baseband signal; and a radio frequency apparatus comprising: a second input interface configured to receive the combined sampling clock signal from the baseband processing apparatus; a demultiplexing multiplexer switch configured to demultiplex the first downlink analog baseband signal to obtain a plurality of second downlink analog baseband signals; and a radio frequency signal generation system coupled to the demultiplexing multiplexer switch and configured to generate, based on the second downlink analog baseband signals, a downlink radio frequency signal to be sent to a terminal device. ### Claim 12 (depends on 11) The radio access device of claim 11, wherein the frequency generator is further configured to generate a downlink carrier corresponding to the first downlink digital baseband signals, wherein the combiner is further configured to: obtain, from the frequency generator, the downlink carrier; and further combine the sampling clock signal, the first downlink analog baseband signal, and the downlink carrier to obtain the combined sampling clock signal, and wherein the downlink carrier enables the radio frequency apparatus to perform up-conversion frequency mixing on the second downlink analog baseband signals and the downlink carrier to generate the downlink radio frequency signal to be sent to the terminal device. ### Claim 13 (depends on 12) The radio access device of claim 12, wherein the radio frequency apparatus further comprises a splitter configured to split the combined sampling clock signal, and wherein the radio frequency signal generation system comprises an up-converter configured to perform the up-conversion frequency mixing on the second downlink analog baseband signals and the downlink carrier to generate the downlink radio frequency signal to be sent to the terminal device. ### Claim 14 (depends on 11) The radio access device of claim 11, wherein the radio frequency apparatus further comprises: a splitter configured to split the combined sampling clock signal; and a downlink demultiplexing timing control system is configured to generate the first timing control signal based on the sampling clock signal, and wherein the demultiplexing multiplexer switch is further configured to further demultiplex the first downlink analog baseband signal using the first timing control signal. ### Claim 15 (depends on 11) The radio access device of claim 11, wherein the sampling clock signal has a frequency of about 440 megahertz (MHz). ### Claim 16 A radio access device comprising: a radio frequency apparatus comprising: an antenna configured to receive a plurality of uplink radio frequency signals from a terminal device; a second input interface configured to receive a sampling clock signal; a down-converter coupled to the antenna and configured to perform down-conversion on the uplink radio frequency signals to obtain a plurality of first uplink analog signals; an uplink multiplexing timing control system configured to generate a second timing control signal based on the sampling clock signal; and a multiplexing multiplexer switch coupled to the down-converter and configured to: multiplex the first uplink analog signals into a second uplink analog signal using the second timing control signal; and send the second uplink analog signal through a second output interface; and a baseband processing apparatus comprising: a first input interface configured to receive the second uplink analog signal from the multiplexing multiplexer switch; an analog-to-digital converter (ADC) coupled to the first input interface and configured to convert the second uplink analog signal into a first uplink digital signal; and a demultiplexing system coupled to the ADC and configured to demultiplex the first uplink digital signal to obtain a plurality of second uplink digital signals. ### Claim 17 (depends on 16) The radio access device of claim 16, wherein the second input interface is configured to receive an uplink frequency mixing signal from the baseband processing apparatus, and wherein the down-converter is further configured to perform down-conversion frequency mixing on the uplink radio frequency signals and the uplink frequency mixing signal. ### Claim 18 (depends on 16) The radio access device of claim 16, wherein the baseband processing apparatus further comprises a first output interface configured to send an uplink frequency mixing signal to the radio frequency apparatus, and wherein the uplink frequency mixing signal enables the radio frequency apparatus to perform down-conversion frequency mixing on the uplink radio frequency signals and the uplink frequency mixing signal. ### Claim 19 (depends on 16) The radio access device of claim 16, wherein the baseband processing apparatus further comprises a first output interface configured to send the sampling clock signal to the radio frequency apparatus, and wherein the sampling clock signal enables the radio frequency apparatus to generate the second timing control signal. ### Claim 20 (depends on 16) The radio access device of claim 16, wherein the sampling clock signal has a frequency of about 560 megahertz (MHz).