# US 8,542,775 B2 · Serial data interface for software-defined radio system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,542,775 B2 - Document ID: US8542775B2 - Status: Granted - Kind: B2 - Application number: 12/945,584 - Filed: 2010-11-12 - Published: 2012-05-17 - Granted: 2013-09-24 - Earliest claimed: 2010-11-12 - Assignees: CSR Technology Inc. - Applicants: Stefan Volnhals - Inventors: Stefan Volnhals - Web page: https://patentgrep.com/patent/US8542775B2 ## CPC - H04B 1/0003: {Software-defined radio [SDR] systems, i.e. systems wherein components typically implemented in hardware, e.g. filters or modulators/demodulators, are implented using software, e.g. by involving an AD or DA conversion stage such that at least part of the signal processing is performed in the digital domain (digital baseband systems H04L25/00; digital modulation/demodulation H04L27/00; CDMA H04B1/707; TDMA H04B7/2643; image transmission H04N5/00)} - H04B 1/0007: {wherein the AD/DA conversion occurs at radiofrequency or intermediate frequency stage} - H04B 1/006: {using switches for selecting the desired band (H04B1/0057 takes precedence)} - H04B 1/18: Input circuits, e.g. for coupling to an antenna or a transmission line (coupling networks between antennas or lines and receivers independent of the nature of the receiver H03H) - H04B: TRANSMISSION ## Abstract A radio system comprises a front-end receiver for receiving a RF signal and converting the RF signal into a digital payload signal. The system further comprises a base-band processor for processing the digital payload signal, and a serial data interface over which the front-end communicates the digital payload signal and meta data to the base-band processor. The meta data may comprise information indicating whether a corresponding digital payload signal communicated over the serial data interface is valid and additional information of the front-end status, e.g. gain or state of tuning. ## Claims ### Claim 1 A radio system comprising: a front-end receiver for receiving a radio frequency (RF) signal and converting the RF signal into a digital payload signal, wherein said front-end receiver is configured to generate frames each containing data of said digital payload signal and meta data; a base-band processor for processing the digital payload signal; and a serial data interface over which said front-end communicates said frames each containing data of said digital payload signal and meta data in a single digital data stream to said base-band processor, wherein said meta data comprises first meta data, and said front-end receiver is configured to generate the first meta data for corresponding digital payload data and to multiplex the first meta data over a plurality of frames. ### Claim 2 (depends on 1) The radio system of claim 1 wherein said base-band processor comprises a digital signal processor. ### Claim 3 (depends on 1) The radio system of claim 1 wherein each of said frames comprises a first number of bits for said digital payload signal and a second number of bits for said meta data, wherein said first number and said second number is each at least one. ### Claim 4 (depends on 3) The radio system of claim 3 wherein each of said frames is 32 bits, and wherein said first number of bits is 16 and wherein said second number of bits is 16. ### Claim 5 (depends on 1) The radio system of claim 1 wherein said first data comprises at least one of gain information and a temperature index of the front-end receiver. ### Claim 6 (depends on 1) The radio system of claim 1 wherein said front-end receiver is further configured to generate second meta data for corresponding digital payload data and communicate said second meta data in each of said plurality of frames. ### Claim 7 (depends on 6) The radio system of claim 6 wherein said second meta data comprises at least one of information indicating whether a phase-locked loop (PLL) was locked and information indicating whether an error occurred in analog-to-digital conversion (ADC). ### Claim 8 (depends on 1) The radio system of claim 1 wherein said base-band processor is configured to manage processing of said digital payload signal based at least in part on said meta data. ### Claim 9 (depends on 1) The radio system of claim 1 wherein said meta data comprises information indicating whether a corresponding digital payload signal communicated over said serial data interface is valid. ### Claim 10 (depends on 1) The radio system of claim 1 wherein said meta data comprises at least one of: information indicating whether phase-locked loop (PLL) was locked during sampling by the front-end receiver, information indicating whether analog-to-digital conversion performed by the front-end receiver is error free, information indicating front-end receiver gain, information indicating front-end receiver temperature, and information indicating a state of tuning by the front-end receiver. ### Claim 11 A method comprising: receiving, at a front-end receiver, a radio frequency (RF) signal converting, at said front-end receiver, the RF signal into payload data; generating, at said front-end receiver, a single digital data stream comprising frames each containing payload data and meta data; and communicating, via a serial data interface, said digital data stream from said front-end receiver to a base-band processor, wherein said generating comprises multiplexing a first portion of said meta data over a plurality of said frames. ### Claim 12 (depends on 11) The method of claim 11 wherein each of said frames comprises a first number of bits for said digital payload signal and a second number of bits for said meta data, wherein said first number and said second number is each at least one. ### Claim 13 (depends on 11) The method of claim 11 wherein said first portion of said meta data comprises at least one of gain information and a temperature index of the front-end receiver. ### Claim 14 (depends on 11) The method of claim 11 wherein said generating comprises: generating a second portion of said meta data fully in each of said plurality of frames. ### Claim 15 (depends on 14) The method of claim 14 wherein said second portion of said meta data comprises at least one of information indicating whether phase-locked loop (PLL) was locked and information indicating whether an error occurred in analog-to-digital conversion (ADC). ### Claim 16 (depends on 11) The method of claim 11 further comprising: managing, by said base-band processor, processing of said payload data based at least in part on said meta data. ### Claim 17 (depends on 11) The method of claim 11 wherein said meta data comprises information indicating whether corresponding payload data in the digital data stream is valid. ### Claim 18 (depends on 11) The method of claim 11 wherein said meta data comprises at least one of: information indicating whether phase-locked loop (PLL) was locked during sampling by the front-end receiver, information indicating whether analog-to-digital conversion performed by the front-end receiver is error free, information indicating front-end receiver gain, information indicating front-end receiver temperature, and information indicating a state of tuning by the front-end receiver. ### Claim 19 A radio system comprising: a front-end receiver, wherein said front-end receiver is configured to: receive a radio frequency (RF) signal: convert the RF signal into payload data; generate a single digital data stream comprising frames each containing payload data and meta data; and output said digital data stream via a serial data interface, wherein the front-end receiver generates the single digital data stream by multiplexing a portion of said meta data over a plurality of said frames. ### Claim 20 (depends on 19) The radio system of claim 19 wherein said front-end receiver comprises: means for receiving said RF signal; means for generating said single digital data stream comprising said payload data and said meta data; and means for outputting said digital data stream via said serial data interface. ### Claim 21 (depends on 19) The radio system of claim 19 wherein said serial data interface is communicatively coupled from said front-end receiver to a base-band processor. ### Claim 22 (depends on 19) The radio system of claim 19 wherein said meta data comprises information indicating whether corresponding payload data in the digital data stream is valid.