Digital Waveform Systems, Inc.

MIMO-ISS Waveform System

MIMO-ISS Waveform System

The MIMO-ISS Waveform System is a “non-linear” digital communications, modulator-demodulator (i.e. modem) waveform system. The architecture of this “non-linear” modem system is realized with a system referred to as the Intermodulation Spread Spectrum (ISS) System.

Intermodulation Spread Spectrum (ISS) System

The Intermodulation Spread Spectrum (ISS) system is composed of three basic modem subsystems. These modem subsystems are the following:

  • IWSK Subsystem:
    		•

    Intermodulation Waveform Shift Keying (IWSK) provides the User Data Transport Layer.
  • CIMA Subsystem:
    		•

    Coded Intermodulation Multiple Access (CIMA) provides the Code Division Multiple Access (CDMA) Layer.
  • MDSM Subsystem:
    		•

    Multi-Dimensional Symbol Multiplexing (MDSM) provides the Digital Waveform Symbol Mapping Layer.

Intermodulation Spread Spectrum is a highly non-linear mathematical system. Details of the ISS non-linearity concepts are presented below.

The Multiple-Input, Multiple-Output Intermodulation Spread Spectrum (MIMO-ISS) Waveform System is a new class of digital waveform system.

Business Development Strategy

The MIMO-ISS Waveform System is envisioned as a future-generation non-linear digital communications modem system. As such, the MIMO-ISS Waveform System is an enabling technology for a number of markets.

First, as illustrated in Figure 1, the ISS waveform technology is envisioned as a 5G Next-Generation "Digital Waveform" Technology. The MIMO-ISS Waveform System is an advanced waveform technology that enables high power efficiency, high spectrum efficiency, and high system capacity systems. These characteristics enable the development of future-generation size-efficient and power-efficient hand-held, mobile, wireless, vehicular, and networked communication systems and devices.

Second, Figure 2 illustrates the application of the MIMO-ISS Waveform System to address next generation "smart cities" markets. The MIMO-ISS Waveform System enables advancements in MIMO-CRN, MIMO-WTRP, and MIMO-WRPR next generation cellular networking technologies.

MIMO-ISS Waveform System

(5G “Next-Generation” Smart Cities Markets)

 

 

Figure 2: MIMO-ISS Waveform System enables Next Generation Smart Cities

Third, Figure 3 illustrates the application of the MIMO-ISS Waveform Modem System to address next-generation "automotive radar" markets. ISS waveform technology enables advancements in driver assistance systems, autonomous cars, driverless cars, and self-driving vehicles.

MIMO-ISS Waveform System

(5G “Next-Generation” Automotive Radar Markets)

 

 

Figure 3: MIMO-ISS Waveform System enables Next Generation Automotive Radar Markets

Intermodulation Spread Spectrum (ISS) System

Intermodulation Spread Spectrum (ISS) is a state-of-the-art, non-linear, angle-modulated, spread spectrum digital modulation system. Moreover, the ISS waveform is a constant-envelope and multi-dimensional wideband digital spread spectrum system. ISS channel characteristics enable digital communications systems that offer high immunity to interception, detection, and jamming. ISS performance characteristics enable digital communications systems that offer high power efficiency, high spectrum efficiency, and high system capacity.

The MIMO-ISS Waveform System introduces two “innovative” non-linear modulation concepts. These non-linear modulation concepts are:

Non-linear Mathematical System

Intermodulation Spread Spectrum (ISS) is a highly non-linear mathematical system. The ISS waveform is characterized as a non-linear, non-binary, orthogonal, noise-space waveform system. As such, the ISS waveform is a highly immune to channel impairments. In terms of its channel communications performance, this non-linearity property provides a number signal processing and digital communications advantages as follows:

The MIMO-ISS Waveform System operates using a concept referred to as non-linear variance compression. The concept of non-linear variance compression is illustrated in the figures below as follows:

MIMO-ISS Waveform System

Non-Linear Suppression of Additive Gaussian Noise – QPSK

(QPSK + AWGN)

Eb/No = 6.0 dB

SNR = 10 dB, # Bits = 32, BW = 16

IWSK

Processing Gain

 

(IWSK + AWGN)

Eb/No = 6.0 dB

SNR = 10 dB, # Bits = 32, BW= 96

 

 

IWSK Processing Gain

Gp = 36.66 dB

 

 

IWSK Probability of Error

BER à 0

 

 

AWGN Channel Model

 

Figure 4: MIMO-ISS Waveform System enables Non-Linear Suppression of Additive Gaussian Noise – QPSK

MIMO-ISS Waveform System

Non-Linear Suppression of Multi-Path Interference – QPSK

(QPSK + Multi-Path)

Eb/No = 6.0 dB

SNR = 10 dB, # Bits = 32, BW = 16

IWSK

Processing Gain

 

(IWSK + Multi-Path)

Eb/No = 6.0 dB

SNR = 10 dB, # Bits = 32, BW= 96

 

 

IWSK Processing Gain

Gp = 36.66 dB

 

 

IWSK Probability of Error

BER à 0

 

 

Multi-Path Channel Model

 

 

Figure 5: MIMO-ISS Waveform System enables Non-Linear Suppression of Multi-Path Interference – QPSK

EIA 9-Ray Urban Fast Fading Model

Table 1 below defines the multipath fast fading RF channel profile according to the Electronic Industries Association (EIA) urban environments.

EIA Urban Fast Fading Multipath Profile

Ray

Delay (microsec)

Doppler (Hz)

Attenuation (dB)

Statistics

1

0.0

5.2314

2.0

Rayleigh

2

0.2

5.2314

0.0

“

3

0.5

5.2314

3.0

“

4

0.9

5.2314

4.0

“

5

1.2

5.2314

2.0

“

6

1.4

5.2314

0.0

“

7

2.0

5.2314

3.0

“

8

2.4

5.2314

5.0

“

9

3.0

5.2314

10.0

“

Table 1: Urban Fast Fading RF Channel Model

Non-linear Capacity Analysis

The ISS waveform enables high data rate transport capacity at low energy and/or power levels per transmitted bit. In terms of its baseband communications performance, this non-linearity property provides several signal processing and digital communications advantages as follows:

The concept of non-linear variance compression enables improvements in power efficiency, spectrum efficiency, and system capacity. These improvements are illustrated in Figure 6 below.

MIMO-ISS Waveform System

IWSK Non-Linear Capacity Analysis

 

 

AWGN Channel Model

 

Figure 6: MIMO-ISS Waveform System enables High IWSK Non-Linear System Capacity

Software-Defined Radio

As an implementation strategy, intermodulation spread spectrum is proposed as a software-defined radio (SDR) digital waveform system. ISS waveform technology offers advanced dynamic multi-mode operations with low probability of intercept, detection, and jamming capabilities that promise to be superior to and surpass the performance of conventional spread spectrum systems. Secondly, ISS is a constant-envelope technology and therefore offers lower system complexity and provides improved size, weight, cost, and power efficiency. Unique to this constant-envelope spread-spectrum technology, ISS can be operated in a novel spread spectrum mode that provides high data rate, bandwidth-efficient, and spectral-efficient communications.

Proprietary

The MIMO-ISS System is proprietary and confidential to Digital Waveform Systems, Incorporated. Detailed information and description of the concepts, algorithms, mathematical formulations, architectural diagrams, signal-flow diagrams, and technologies, of the MIMO-ISS System, can be provided and disclosed subject to mutual non-disclosure agreements.

If you are interested in learning more about the details, specifications, and capabilities of the MIMO-ISS System you can contact us at Digital Waveform Systems, Incorporated.