Soqpsk

Specifications. Ordering Information. The RSA306B uses your PC and Tektronix SignalVu-PC™ RF Signal Analysis Software to provide real time spectrum analysis, streaming capture and deep signal analysis capabilities for signals from 9 kHz to 6.2 GHz, all in a low-cost, highly portable package that is ideal for field, factory, or academic use.

SOQPSK SOQPSK-TG TELEMETRY Tier transmitter upgrade Uses. compact-rdms-gen-3 rackmount-rdms-gen-3 receivers-demodulators: datasheets: RDMS™ Rackmount Receiver Datasheet (Gen 3) Apr-2023: Features, specifications, and options of the Gen 3 Rackmount RDMS™ Telemetry Receiver. 1U 3U Adaptive best bit Bits channel Chassis Clock Coding Combiner ... (SOQPSK) – Binary Phase Shift Keying (BPSK) – Differentially Encoded Quadrature Phase Shift Keying (DEQPSK) B1-9. Spitfire Characteristics (continued) • Temperature – Operating Temperatures: -30 to +55degrees C/-22 to 131degrees F – Storage Temperature: -45 to +75 degrees C/-49 toMay 22, 2022 · 2.8.2 Binary Phase Shift Keying. PSK uses prescribed phase shifts to define symbols, each of which can represent one, two, or more bits. Binary Phase Shift Keying (BPSK), illustrated in Figures \(\PageIndex{1}\) and \(\PageIndex{2}\), has two phase states and conveys one bit per symbol and is a relatively spectrally inefficient scheme, with a maximum (i.e. ideal) modulation efficiency of \(1 ... Best SOQPSK-TG detection in the Industry, yielding improvements of 2 dB or more over the competition’s single-symbol detectors; True multi-symbol trellis detection all three ARTM modes for optimal demodulation; 3.5 to 5 dB improvement in PCM/FM performance vs. the best single-symbol demodulators, to within 0.2 dB of the theoretical limit ...Added digital output (Option 003) & input (Option 004) connectivity with N5102A Baseband Studio module, added capability to allow user to specify repeat count for single triggered waveforms, and more. Product introduction, initial firmware. For use with the MXG X-Series Signal Generators: N5181B, N5182B and N5183B.The performance analysis and simulation results show that under the same BER performance, the power consumption of the MA-SOQPSK transmitter is 7.5 dB and 6.3 dB lower than the 16 QAM transmitter ...

Jul 15, 2020 · SOQPSK-TG STC : A new decoding scheme for a higher bit rate and a better budget link Summary To protect telemetry from antenna masking during flight tests, two antennae must be used on-board. To ... about 10-5) for 5 Mb/s PCM/FM, SOQPSK-TG, and multi-h CPM with several interfering bit rates (interfering bit rate and modulation method are shown in the legend (5MDFM is 5 Mb/s PCM/FM)) and several frequency spacings. The solid horizontal line shows the BEP at 0.5 dB degradation. Figures 7 and 8 show the results of similar tests for 8 Mb/s ... PCM/FM, SOQPSK, AND MULTI-H CPM IN A MULTIPATH CHANNEL Terrance Hill & Mark Geoghegan Nova Engineering Inc., Cincinnati, OH ABSTRACT It is widely recognized that telemetry channels, particularly airborne channels, are afflicted by multipath propagation effects. It has also been shown that adaptiveSOQPSK, GMSK SBW Mode 1 and Mode 2. Command Waveforms FSK/AM (SGLS) BPSK PCM/PM Subcarrier BPSK/PM Subcarrier BPSK/FM SBW Mode 1 and Mode 2. Satellite Ranging PRN (SGLS) The QPSK transceiver model in this script is divided into the following four main components. 1) QPSKTransmitter.m: generates the bit stream and then encodes, modulates and filters it. 2) QPSKChannel.m: models the channel with carrier …The SOQPSK-A filter is for use with SOQPSK CPM signals. The filter parameters for supported SOQPSK variants are listed below. SOQPSK Type. ρ. B. T1. T2. SOQPSK-TG (IRIG 106-04) 0.70.OQPSK SOQPSK SOQPSK-A, -B Bit Period Frequency Deviation) &˘ -() '˘ %˚˘˛ (IQ I Q IQ 01 11 10 00 01011 0 +135 + 45 - 45-135 0 T 2T 3T I Q

I'm trying to build an SOQPSK-TG signal in MATLAB/Octave. I am following this paper for formulas. I'm trying to generate a waveform for the phase, equation 2.4: Where q(t) is the phase pulse, equation 2.3: f is the partial-response frequency pulse (L=8 for SOQPSK-TG): and w is the window function: for SOQPSK-TG, we have the following values:When the phase correlation length is greater than 1, it is called SOQPSK- TG. SOQPSK-TG has better power spectrum characteristics. According to the SOQPSK-TG signal model, the integer rate sampling is realized by interpolating baseband and interpolating phase. Combined with the analysis of demodulation results, it is concluded that the ...To automatically configure the VSA for measuring signals that conform to the IRIG 106-04 standard, on the Format tab, click Preset to Standard > Other and select SOQPSK-TG (IRIG 106-04). Note that the SOQPSK-TG preset sets the symbol rate to 5 MHz Megahertz: A unit of frequency equal to one million hertz or cycles per second. although the ...Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.. Visit Stack ExchangeSpecifications. Ordering Information. The RSA306B uses your PC and Tektronix SignalVu-PC™ RF Signal Analysis Software to provide real time spectrum analysis, streaming capture and deep signal analysis capabilities for signals from 9 kHz to 6.2 GHz, all in a low-cost, highly portable package that is ideal for field, factory, or academic use.

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A proposed Extensible SOQPSK modulation waveform brings the best of both OFDM modulation and single-carrier SOQPSK modulation to telemetry applications.Symbol Timing Recovery for SOQPSK 21 Normalized timing variance • Accuracy of the feedback scheme measured numerically via simulation for the two versions of SOQPSK. • Simulations done for four cases: • SOQPSK-MIL with Loop BW 1x10-3 and 1x10-2. • SOQPSK-TG with Loop BW 1x10-3 and 1x10-2 along with PT.I'm trying to build an SOQPSK-TG signal in MATLAB/Octave. I am following this paper for formulas. I'm trying to generate a waveform for the phase, equation 2.4: Where q(t) is the phase pulse, equation 2.3: f is the partial-response frequency pulse (L=8 for SOQPSK-TG): and w is the window function: for SOQPSK-TG, we have the following values:The capacity of SOQPSK-TG. Abstract: In this paper we compute the capacity and the pragmatic capacity of aeronautical telemetry shaped-offset quadrature phase-shift keying (SOQPSK-TG). In the pragmatic approach, SOQPSK-TG is treated as a modulation scheme as opposed to an encoder, and no iterations are performed between the SOQPSK-TG ...For these applications, Signal Studio includes custom I/Q quick setups such as digital video (e.g., DVB-S2X APSK), custom SOQPSK and custom OFDM that users can modify to fit their requirements. Signal Studio for custom modulation is also the signal-creation companion to the 89600 VSA software with Option BHK, custom I/Q modulation …

SOQPSK-TG Parameters.....2-9 Table 2-5. SOQPSK Pre-Coding Table For IRIG-106 Compatibility.....2-10 Table 2-6. Dibit To Impulse Area Mapping.....2-11 . This page intentionally left blank. ii . CHAPTER 2 TRANSMITTER AND RECEIVER SYSTEMS 2.1 Radio Frequency Standards for Telemetry These standards provide the criteria to determine equipment and ...To automatically configure the VSA for measuring signals that conform to the IRIG 106-04 standard, on the Format tab, click Preset to Standard > Other and select SOQPSK-TG (IRIG 106-04). Note that the SOQPSK-TG preset sets the symbol rate to 5 MHz Megahertz: A unit of frequency equal to one million hertz or cycles per second. although the ...In this article, we explore the relationship between an equalizer and a combiner operating on the available polarization states of a received signal in aeronautical mobile telemetry. The maximum likelihood combiner is derived and shown to be equivalent to summing the outputs of two filters matched to the channels in the horizontal and …SOQPSK and GMSK. Quantify performance of SOQPSK and GMSK in channels with phase noise for uncoded and coded systems which use these schemes as inner codes. Determine which is to be preferred for a given requirement. Added digital output (Option 003) & input (Option 004) connectivity with N5102A Baseband Studio module, added capability to allow user to specify repeat count for single triggered waveforms, and more. Product introduction, initial firmware. For use with the MXG X-Series Signal Generators: N5181B, N5182B and N5183B.Download scientific diagram | Simulated Spectral Comparison. from publication: Telemetry applications of SOQPSK and GMSK based modulation for airborne platforms | Bandwidth restrictions for flight ...Ternary signal. In telecommunication, a ternary signal is a signal that can assume, at any given instant, one of three states or significant conditions, such as power level, phase position, pulse duration, or frequency . Examples of ternary signals are (a) a pulse that can have a positive, zero, or negative voltage value at any given instant ...Shaped offset quadrature phase shift keying (SOQPSK) modulation scheme and its application in optical wavelength-division multiplexed (DWDM) transmission.SOQPSK can be considered as a highly bandwidth efficient form of CPM with unique characteristics that represent considerable advantages at the transmitter side [2]. The transmitted SOQPSK signal, which is described in detail in, e.g. [1], has the following form Es s(t; ®) = ejÃ(t;®) TsDECT, VDL Mode 2, MIL-STD CPM and SOQPSK-TG • Support to recall N7608C setup file *.scp for Data Segment with specified Index settings Flexible custom OFDM modulation analysis • Support to configure user defined OFDM signal settings inside the measurement • Support to recall 89600 VSA output *.setx setting filesSOQPSK, GMSK SBW Mode 1 and Mode 2. Command Waveforms FSK/AM (SGLS) BPSK PCM/PM Subcarrier BPSK/PM Subcarrier BPSK/FM SBW Mode 1 and Mode 2. Satellite Ranging PRN (SGLS)

Quasonix is recognized as the industry leader for spectrally efficient modulations such as SOQPSK-TG and Multi-h (ARTM) CPM and for ongoing innovation in the field of telemetry. Our product line includes multi-mode telemetry transmitters; multi-mode, multi-symbol trellis telemetry demodulators; complete multi-mode telemetry receivers; rack ...

L3Harris is a premier manufacturer of missile and aircraft flight test instrumentation and complete airborne turnkey systems. Our airborne telemetry and flight test products gather and process critical information aboard spacecraft, aircraft, missiles, guided weapons, targets and UAVs. These products are used in defense and aerospace programs ...The performance analysis and simulation results show that under the same BER performance, the power consumption of the MA-SOQPSK transmitter is 7.5 dB and 6.3 dB lower than the 16 QAM transmitter ...In the part I companion paper we showed that the tier 1 waveforms FQPSK-JR and SOQPSK-TG - can both be viewed as either an XTCQM or a CPM (although the CPM representation of FQPSK-JR is only an approximation). In this paper we examine the performance of three architectures for a common detector: a symbol-by-symbol detector, …The telemetry community has chosen specific values for a variant termed SOQPSK-TG to obtain a good tradeoff between bandwidth and power efficiency: A = 0.5, T1 = 1.5, T2 = 0.5, ρ = 0.7, B = 1.25 The remainder of this paper discusses detectors for the SOQPSK-TG waveform. SOQPSK DETECTORS Two SOQPSK detector types for demodulating SOQPSK are ... Offset quadrature phase-shift keying (OQPSK) is a constant-envelope modulation that has no 180-deg phase shifts and, therefore, has a much higher spectral containment than non-offset quadrature phase- shift keying (QPSK) when transmitted over band-limited nonlinear channels.ARTM SOQPSK (Tier 1) Trellis Demodulator - Verilog Core Mar 2012 FeaturesFeatures This trellis demodulator IP can be targeted at a low cost FPGA for implementation of a high performance SOQPSK Tier 1 receiver. The efficient Viterbi algorithm is used to provide near theoretical bit-error-probability performance over a wide range of E b/N 0. been successfully applied to the shaped-offset quadrature phase-shift keying (SOQPSK) telemetry waveform with low implementation complexity and no additional bandwidth required [6]. Another telemetry waveform defined in [1] is the spectrally efficient advanced range teleme-try (ARTM) continuous phase modulation (CPM).

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A data-aided technique for carrier frequency offset estimation with continuous phase modulation (CPM) in burst-mode transmission is presented. The proposed technique first exploits a special pilot sequence, or training sequence, to form a sinusoidal waveform. Then, an improved dichotomous search frequency offset estimator is introduced to determine …Shaped offset quadrature phase shift keying (SOQPSK) is a highly bandwidth efficient modulation technique used widely in military and aeronautical telemetry standards. It can be classified as a form of continuous phase modulation (CPM), but its major distinction from other CPM schemes is that it has a constrained (correlated) ternary data alphabet. CPM-based …In this paper, we report the bandwidth efficiency of SOQPSK for S-band airborne data links working at 4 Mbps rate [1]. Our results show that the SOQPSK-TG is the more bandwidth …SOQPSK SOQPSK-TG TELEMETRY Tier transmitter upgrade Uses. compact-rdms-gen-3 rackmount-rdms-gen-3 receivers-demodulators: datasheets: RDMS™ Rackmount Receiver Datasheet (Gen 3) Apr-2023: Features, specifications, and options of the Gen 3 Rackmount RDMS™ Telemetry Receiver. 1U 3U Adaptive best bit Bits channel Chassis Clock Coding Combiner ...17‏/06‏/2020 ... In this PhD thesis, we focus on shaped offset quadrature phase-shift keying telemetry group. (SOQPSK-TG) whose use is getting more and more ...Figure 3. SOQPSK modulation flow diagram. C. Receiver Similar to the transmitter, the receiver signal processing blocks are divided into the FPGA and the host controller. As shown in the bottom of Figure 1, the receiver is comprised of an OFDM receiver and a SOQPSK receiver. Depending on the MCS signal, the received signals become the input to SOQPSK can be considered as a highly bandwidth efficient form of CPM with unique characteristics that represent considerable advantages at the transmitter side [2]. The transmitted SOQPSK signal, which is described in detail in, e.g. [1], has the following form Es s(t; ®) = ejÃ(t;®) TsTo automatically configure the VSA for measuring signals that conform to the IRIG 106-04 standard, on the Format tab, click Preset to Standard > Other and select SOQPSK-TG (IRIG 106-04). Note that the SOQPSK-TG preset sets the symbol rate to 5 MHz Megahertz: A unit of frequency equal to one million hertz or cycles per second. although the ...Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.. Visit Stack Exchange ….

SOQPSK-TG which consists of differential precoder and CPM modulator was adopted as telemetry standard because of its high power and bandwidth efficiency.A Novel Approach for Embedding Communication Symbols into Physical Radar Waveforms Cenk Sahin 1, John Jakabosky2, 3, Patrick M. McCormick , Justin G. Metcalf and Shannon D. Blunt3 1 Sensors Directorate, Air Force Research Laboratory, Wright-Patterson Air Force Base, OH 2 Radar Division, Naval Research Laboratory, Washington, DC 3 Department …This paper reports the bandwidth efficiency of SOQPSK for S-band airborne data links working at 4 Mbps rate and shows that the SOQ PSK-TG is the more bandwidth efficient modulation scheme than GMSK for telemetry applications.outputs the soft decisions. In addition, it feeds a priori reliability information to the first SOQPSK SOVA decoder. A priori information is punctured and permuted by the interleaver before entering the SOQPSK SOVA decoder. Thus, by using two SOVA decoders in the receiver chain to operate on both inner and outer codes, the overall SNR can be ... Apr 29, 2021 · A proposed Extensible SOQPSK modulation waveform brings the best of both OFDM modulation and single-carrier SOQPSK modulation to telemetry applications. We saw before how a carrier frequency offset distorts the received signal. Later, we also described the classification of frequency synchronization techniques according to the availability of the symbol timing. Today, we will learn about the workings of a frequency locked loop. Background A Phase Locked Loop (PLL) is a device used to …In this paper, we report the bandwidth efficiency of SOQPSK for S-band airborne data links working at 4 Mbps rate [1]. Our results show that the SOQPSK-TG is the more bandwidth …To automatically configure the VSA for measuring signals that conform to the IRIG 106-04 standard, on the Format tab, click Preset to Standard > Other and select SOQPSK-TG (IRIG 106-04). Note that the SOQPSK-TG preset sets the symbol rate to 5 MHz Megahertz: A unit of frequency equal to one million hertz or cycles per second. although the ... Soqpsk, Abstract This paper presents a new quaternary modulation scheme called SOQPSK. The principle on the optical SOQPSK generation is derived and analyzed, ..., Download scientific diagram | Trellis diagram of GMSK. from publication: Telemetry applications of SOQPSK and GMSK based modulation for airborne platforms | Bandwidth restrictions for flight test ..., QPSK-using-MATLAB. Quadrature Phase Shift Keying (QPSK) is a form of Phase Shift Keying in which two bits are modulated at once, selecting one of four possible carrier phase shifts (0, 90, 180, or 270 degrees). QPSK allows the signal to carry twice as much information as ordinary PSK using the same bandwidth., SOQPSK variants are listed in Table 1 and the resulting pulse shapes and spectra are plotted in Figures 2 and 3. For comparison purposes, MIL-STD-188-182 SOQPSK, which uses a rectangular frequency pulse, is also included. The dramatic reduction in sidelobe energy makes SOQPSK-A and SOQPSK-B very attractive for terrestrial, , We saw before how a carrier frequency offset distorts the received signal. Later, we also described the classification of frequency synchronization techniques according to the availability of the symbol timing. Today, we will learn about the workings of a frequency locked loop. Background A Phase Locked Loop (PLL) is a device used to …, SOQPSK variants are listed in Table 1 and the resulting pulse shapes and spectra are plotted in Figures 2 and 3. For comparison purposes, MIL-STD-188-182 SOQPSK, which uses a rectangular frequency pulse, is also included. The dramatic reduction in sidelobe energy makes SOQPSK-A and SOQPSK-B very attractive for terrestrial,, SOQPSK-TG with respect to PCM-FM are shown in Fig. 7. We have utilized 4 Mbps data rate that is a comparable number for video, audio and other data streams required for digital telemetry [6]. It ..., Data filtering is used in digital demodulation to limit bandwidth and reduce intersymbol interference. This VSA includes several commonly used filter types and has the ability to apply user-defined filters. All filters are computed to 20 symbols in length by default. If the filter alpha is < 0.4, the VSA uses extended filter length (40 symbols ... , E-SOQPSK is single carrier (SC) modulation waveform, a deviation of the traditional OFDM, LTE (uplink) waveforms scheme. E-SOQPSK can be configured to BPSK, OQPSK, m-QAM or Constant Envelop (CE) SOQPSK modulation waveform. The performance comparison of E-SOQPSK with OFDM [9], SOQPSK-TG [10], and LTE (UL) [14] is shown in Table 1 below. [8] [15] , PCM/FM, SOQPSK, AND MULTI-H CPM IN A MULTIPATH CHANNEL Terrance Hill & Mark Geoghegan Nova Engineering Inc., Cincinnati, OH ABSTRACT It is widely recognized that telemetry channels, particularly airborne channels, are afflicted by multipath propagation effects. It has also been shown that adaptive, Input high, output low. If the input signal is low there won't be any base current, and no collector current. No current through R1 means no voltage drop, so that the output will be at +V. Input low, output high. This already leads a bit further, but like I said in comment to sandun the output is highly asymmetrical., from from 5 to Mbps (SOQPSK.TG) LDPC (Optional Tier O (PCWFM).ARTM Tier 1 Tier 2 (Multi-h Optional) (all 106-13Compliant) 31-pinMicro-D 13.pin Micro.Miniature 1.75:1 (50 Q nominal [email protected] F Blok Lcdumlu A / Mechanical Specificaüms Dimensions Environmental Specifications MIL-SrD461G MIL-HDBK-34aA AECTILSCO nG0ç O 23 …, In this paper, we will briefly review the MILYSTD SOQPSK waveform, introduce two new frequency shaping pulses which improve spectral containment, and then ..., High Reliability Transmitter (HRT-920) Miniature S-Band multi-waveform telemetry transmitter – output power of 17 W with data rate capability to 20 Mbps. L3Harris' HRT-920 delivers output power up to 17 W with data rate capability to 20 Mbps. The RF output is also fully protected from high VWSR loads as well as short and open conditions., TLDR. This paper reports the bandwidth efficiency of SOQPSK for S-band airborne data links working at 4 Mbps rate and shows that the SOQ PSK-TG is the more bandwidth …, To automatically configure the VSA for measuring signals that conform to the IRIG 106-04 standard, on the Format tab, click Preset to Standard > Other and select SOQPSK-TG (IRIG 106-04). Note that the SOQPSK-TG preset sets the symbol rate to 5 MHz Megahertz: A unit of frequency equal to one million hertz or cycles per second. although the ..., We saw before how a carrier frequency offset distorts the received signal. Later, we also described the classification of frequency synchronization techniques according to the availability of the symbol timing. Today, we will learn about the workings of a frequency locked loop. Background A Phase Locked Loop (PLL) is a device used to …, A proposed Extensible SOQPSK modulation waveform brings the best of both OFDM modulation and single-carrier SOQPSK modulation to telemetry applications., ARTM CPM, along with PCM/FM and SOQPSK-TG/FQPSK, is one of three modulation schemes standardized within IRIG-106 [1]. The legacy waveform, PCM/FM, is still widely used today though given the ongoing spectrum battles and increasing platform data rate requirements, the migration to SOQPSK/FQPSK has started. The more spectrally efficient SOQPSK/FQPSK, SOQPSK MSLD ~ 0.9dB better that Multi-H MSLD. Note the above BER performance is for data without differential encoding and without randomization. Differential ..., For added convenience, you can save the VSA setup as a quick setup in the VSA's Custom IQ Demod Property window. To do this, recall the Signal Studio VSA setup file, perform the measurement, and then click Save As Quick Setup.Now, whenever you click Quick Setups, you will find your previously saved setup listed among the other setups provided with the …, Abstract This paper presents a new quaternary modulation scheme called SOQPSK. The principle on the optical SOQPSK generation is derived and analyzed, ..., I am trying to understand the terminologies in QAM. This is the information that I have: number of symbols - bits per symbol - samples per symbol - I understand bits per symbol but I am confused ..., High Reliability Transmitter (HRT-920) Miniature S-Band multi-waveform telemetry transmitter – output power of 17 W with data rate capability to 20 Mbps. L3Harris' HRT-920 delivers output power up to 17 W with data rate capability to 20 Mbps. The RF output is also fully protected from high VWSR loads as well as short and open conditions., SOQPSK describes a family of constant-envelope modulations, all of which are a derivative of, and interoperable with, the SOQPSK waveform defined in MIL-STD-188-181 and 188-182. In general terms, all members of the SOQPSK family can be thought of as offset QPSK, modified so that the 90-degree phase transitions are smooth, and always on the unit ..., Mar 5, 2004 · I. Introduction. Offset quadrature phase-shift keying (OQPSK) is a constant-envelope modulation that has no 180-deg phase shifts and, therefore, has a much higher …, Shaped offset quadrature phase shift keying (SOQPSK) modulation scheme and its application in optical wavelength-division multiplexed (DWDM) transmission., Tier I SOQPSK-TG and Tier II Multi-h CPM. The transmitter's design combines ... SOQPSK-TG: Per IRIG 106-13 Quaternary Spectral Mask (Tier 1). MULTI-h/CPM ..., The TG version of SOQPSK is a waveform with partial response (L > 1). An optimal detector for this modulation type requires 512 phase states and MF outputs [1], which is highly complex. A near-optimum approximation called pulse truncation (PT) is applied in, e.g. [4, 5], which allows (2) to be implemented, The spectrums of SOQPSK (both SOQPSK-A and SOQPSK-B) have the same main-lobe as the OQPSK and QPSK and have the side-lobe nearly approaching MSK. In depth of SOQPSK spectrums, the second-order side-lobe of SOQPSK-B has the lower than that of SOQPSK-A. The reason is that SOQPSK-B has the constant envelope which has been shown in Fig. 3., COM-1827SOFT SOQPSK, SOQPSK modem. VHDL source code / IP core: 6/18/23: COM-1831SOFT, Burst mode DSSS modem. VHDL source code / IP core: 7/8/16: COM-1852SOFT PCM/Bi-Phase L/CPM MODEM, CCSDS Proximity-1 modem. VHDL source code / IP core : 9/21/23: COM-5401SOFT, Tri-mode 10/100/1000 Mbps Ethernet MAC. VHDL ..., We show that military standard (MIL-STD) shaped-offset quadrature phase-shift keying (SOQPSK), a highly bandwidth-efficient constant-envelope modulation, can be represented in the form of a cross-correlated trellis-coded quadrature modulation. Similarly, we show that offset QPSK (OQPSK) can be decomposed into a "degraded" trellis encoder and a memoryless mapper. Based on the representations of ..., Multi-h CPM and SOQPSK •Would recommend further investigation into Multi-h CPM for improved spectral efficiency •Best practices for PCM/FM systems also apply to Multi-h CPM and SOQPSK modulation schemes •Best results were seen with direct line of site •Drop outs that resulted from poor aircraft orientation could be mitigated with multiple