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Keysight Technologies
Solutions for Creating and Analyzing
Custom OFDM Waveforms for
Software-Defined Radio (SDR)



                       Application Brief
02 | Keysight | Solutions for Creating and Analyzing Custom OFDM Waveforms for Software-Defined Radio (SDR) - Application Brief




                Many of today's commercial wireless standards are based on a highly versatile
                transmission scheme: orthogonal frequency-division multiplexing (OFDM).
                Additionally, a method to enable multiple users on the same OFDM spectral channel is
                employed called orthogonal frequency-division multiple-access (OFDMA). Examples
                include 802.11a/g/n, 802.11ac/ad, 802.16e WiMAX, FDD-LTE, TDD-LTE and
                LTE-Advanced.

                OFDM and OFDMA technologies provide important advantages in four areas: data
                throughput, spectral efficiency and scalability, data integrity, and waveform
                robustness in the presence of multipath fading. In addition, both technologies have
                the potential to be customized to suit the needs of proprietary applications.

                For these reasons and more, OFDM and OFDMA are viewed as viable technologies for
                the development of communications systems including software-defined radio (SDR)
                and cognitive radio. The more successfully these technologies can be deployed, the
                easier it will be to achieve seamless communication and coordination between diverse
                public-safety agencies or military forces.

                Because OFDM and OFDMA technologies are complex, they pose many challenges
                in the development process. Fortunately, development can be accelerated by design
                and test tools that simplify the creation, simulation, generation and analysis of
                standard or proprietary OFDM and OFDMA waveforms.

                For device testing, waveforms can be created using the Keysight Technologies, Inc.
                SystemVue electronic system level (ESL) design software and downloaded to an
                Keysight high-precision arbitrary waveform generator (AWG). Vector signal
                generators such as the Keysight MXG offers an internal AWG with modulation
                bandwidth to 160 MHz that can be used to produce gigahertz-range carrier signals
                modulated with custom or standardized waveforms. On the analysis side, single-
                input/single-output (SISO) and multiple-input/multiple-output (MIMO) measurements
                are possible. For example, SISO measurements of custom OFDM waveforms can be
                made with an Keysight X-Series RF signal analyzer or an Infiniium 90000 X-Series
                high-performance digital oscilloscope coupled with the Keysight 89600 vector signal
                analysis (VSA) software. Additionally the oscilloscope and VSA software can be used
                for MIMO measurements of OFDMA standard waveforms like LTE or WiMAX.

                This application note outlines the complexities of generating and analyzing
                standardized and custom waveforms, proposes solutions that address these
                problems, and presents the results of the suggested approaches. For those interested
                in deeper background about OFDM and OFDMA, a list of related information is
                included at the end of the note.
03 | Keysight | Solutions for Creating and Analyzing Custom OFDM Waveforms for Software-Defined Radio (SDR) - Application Brief



       Problem
       The use of custom OFDM waveforms presents several key                                and the entire array has been filled with those values
       challenges in both design and test. First, simulation                                plus four bins that contain "pilot" signals.
       environments need custom OFDM baseband simulation                                  

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