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Using advanced terrestrial, airborne, and space-based battle command systems, WIN-T [Wideband Information Networking Technology] will allow the Army to distribute resources into smaller, more effective CPUs [Combat Power Units]. WIN-T is designed to create a seamless battle space network. WIN-T will use commercially available products and standards to provide warfighters with the ability to exchange voice, video, and data over wired or wireless systems, handling battlefield communications from the theater level down to individual battalions. TTNT [Tactical Targeting Network Technology] is interoperable with the WNW [Wideband Networking Waveform] at the Baseband (Layer 1-Physical). This high-speed network enables net-centric sensor technologies to correlate data among multiple platforms by precisely geo-locating time critical targets. TTNT is a “high speed, dynamic ad hoc network” designed to assist the U.S. military in creating a rapid retargeting capability that will be critical across vital military operations. This network is intended to support more than 200 users for secure AJ [Anti-Jam] resistant transmission at Internet speeds, and to allow reception of four or more receive streams simultaneously. WNW [Wideband Networking Waveform] is a Layer 1-Physical and Layer 2-Datalink layer system with capabilities in excess of 512 KBPS as outlined by the JTRS [Joint Tactical Radio System]. Some of the features included are software programmable radios, automatically programmable (waveform controlled), or manually controlled, user controlled, API [Applications Programming Interface] software features, standard IP features and other features.
Background
WNW is a high data rate COFDM [Code (encrypted) Orthogonal Frequency Division Multiplexing] digital waveform developed for JTRS [Joint Tactical Radio Systems]. The COFDM WNW provides a SIS [Signal-In-Space] (wireless) data transmission rate ranging from 47 Kbps up to 12.1 Mbps. What follows is a review of OFDM [Orthogonal Frequency Division Multiplexing] which is a single-carrier or multiple sub-carrier modulation format. The data is split into many closely spaced sub-carriers. The use of many different frequencies makes OFDM very reliable even in noisy and multi-path situations. In addition, OFDM can support higher data rates than single carrier systems. That is, for data rates up to 11 MPBS CCK [Complimentary Code Keying] is acceptable. OFDM can support data rates up to 54 MBPS or higher. 802.11g radios can receive either CCK or OFDM. However, 802.11b uses DSSS [Direct Sequence Spread Spectrum].
While there are many different providers to WNW, Rockwell Collins WNE [Wideband Networking Engine] Wireless is emerging as one of the solutions. WNE complements multi-band JTRS radios and allows the user to deploy and use available spectrum – even non-contiguous and different sized channel bandwidths. WNW uses advanced DSP [Digital Signal Processing] waveform with digital communication techniques including DPSK [Differential Phase Shift Keying] and QPSK [Quadrature Phase Shift Keying]. PSK [Phase Shift Keying] varies the carrier (power level) signal. Like with multiple shifts (changes) in frequency, there are many changes in phases. BPSK [Binary (two) PSK] shifts 180 degrees. With DPSK, the phase is not shifted by some known factor but by the phase of the last symbol sent.
QPSK [Quadrature Phase-Shift Keying] is a system of modulating digital signals onto a radio-frequency carrier signal using four phase states to code two digital bits.
DQPSK [Dual Quadrature Phase-Shift Keying] is phase modulation using two pairs of unique carrier phases using a differential characteristic, which indicates the use of a different phase from the last change or symbol to determine the current symbol’s value, rather than any absolute measurement of the phase change.
DBPSK [Dual Binary Phase-Shift Keying] is a phase modulation system using two distinct carrier phases for data signaling providing one bit per symbol.
QAM [Quadrature Amplitude Modulation] is a system modulating digital signals onto a radio-frequency carrier signal involving both amplitude and phase coding.
These technologies are critical to modem data transmission, cable modems, and other digital data transmission systems.
For more details see TECHtionary’s QAM.
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