Maplebrook provides the following consulting/contract services:

Adaptive Signal Processing

• Adaptive equalizers
• Adaptive nonlinear Predistortion for PA
• Network Echo Cancellation
• LMS, NLMS, VSSLMS
• RLS, SFTF, Conjugate Gradient

Audio Signal Processing

• Acoustic Echo Cancellation
• Active Noise Cancellation
• Surveillance microphones
• Microphone beam forming
• Digital lossless and lossy compression
• Spectral analysis, editing

 Defense Industry

• OFDM and 1553B interference cancellation
• 200Mbps OFDM modem, adaptive tone mapping
• ECM for RCIED mitigation
• Class E (70 % efficient) HPA design 30W
• Dual band antenna matching, high power coaxial and binocular balun interface

Digital Signal Processing (DSP)

• Artificial Neural Networks (ANNs)
• Codebook Algorithms
• Filtering
  • Finite Impulse Response (FIR),
  • Infinite Impulse Response (IIR)
• Forward Error Correction (FEC)
• Hard/Soft Viterbi Decoding
• Hidden Markov Models (HMMs)
• Microphone Array Beamforming
• Noise Reduction Algorithms

DSP Hardware Programming

• Analog Devices SHARC
• ARC Core
• Data Acquisition
• Motorola 56000
• Motorola 96000
• TMS320C54x
• TMS320C6x

Encryption-Decryption Capabilities

• Design, prototype and test hardware based cryptographic engine using COTS or custom designed[1] FPGA development boards.
• Design, prototype and test programmable DSP based cryptographic engine using COTS or custom designed[2] development boards.
• Design, implement and test commonly used encryption standards such as AES (Suite B symmetric and asymmetric encryption algorithms), DES (for legacy support) and proprietary algorithms for both hardware (FPGAs) and software (Programmable DSPs) platforms.
• Expertise in FPGA/ Programmable DSP firmware development for encryption-decryption applications
• Experienced in designing communication security (COMSEC) and transmission security (TRANSEC) for ECCM applications such as shipboard radio or CNR (Combat Net Radio) applications.
• Porting existing cryptography/MODEM functions to the new FPGA/Programmable DSP firmware

Microcontroller Programming

• Motorola MC68HC11,
• Motorola MC68HC08

Networks

• Networking Protocols
  • Internet Protocol (IP),
  • User Datagram Protocol (UDP),
  • Transmission Control Protocol (TCP),
  • ITU-T H.323,
  • IETF Session Initiation Protocol (SIP),
  • IETF Real-Time Transfer Protocol (RTP),
• Network Echo Cancellation
• Network Delay Prediction Techniques
• Telephone Networks
  • Call Waiting,
  • FSK modems,
  • Caller ID

Operating Systems (OS)

• Concurrent OS designed for TMS320C54X
• Experience with Real-Time OS
• Semaphores, Threads, Tasks, etc…

Optical Communications Design Services

• Digital PLL analysis for DCR.
• Front-end optical transmit/receive electrical interfaces for OC12, OC48 and OC192 systems.
• Laser Driver and PIN TIA receiver matching for optimum eye opening.
• OC192 transceiver jitter, clock, trace skew estimation.
• Reed Solomon encoding for FEC

Patent Analysis and Litigation Capability

• Expert witness services.
• Patent mining and analysis.
• Proof of infringement evidence collection.
• Technical due diligence.

Programming

• GNU C/C++
• MATlab
• SystemView
• TCL
• Visual C/C++

Psychoacoustic Test & Measurement

• TDT RP2 Programming
• RPVDS Programming Environment

RF System Design

• LNA design
• HPA design, Class A, B, C, D, S.
• High speed digital
• PLL synthesizer

   RF Layout. Click to view full sized image.

Radio Modem Design

• Matlab, Simulink Modeling
• RF layout and design
• BER analysis
• Nonlinear distortion
• Digital and analog transceiver design and analysis
• Satcom

   Spectrum use. Click to view full sized image.

Real-Time Programming

• Event-Driven
• Use Case Map Design Methodology

Schematic Capture and PCB Design

• Turnkey schematic capture, layout and board manufacturing.
• RF and digital layout, microstrip, and lumped element board development.
• Up to 12 layer capability.

  Schematic Capture and PCB Design. Click to view full sized image.

Software Verification Testing

• Verification of Hardware RTL Designs
• Verification of Software Modules

Speech Coding

• Linear Predictive Coding (LPC)
• Algebraic Code Excited Linear Prediction
  • (ACELP) (G.723.1)
• Low Delay Code Excited Linear Prediction
  • Coder Used in GSM (G.728)
• Adaptive Differential Pulse Code Modulation
  • mu/A-law (G.711)
• Speex Sub-band CELP (Public Domain)
• Voice Activity Detection (VAD)

Speech Recognition

• Algebraic Code-Excited Linear Prediction (ACELP)
• Classification Algorithms (K-Nearest Neighbours, Neural Networks)
• Codebook Algorithms
• Hard/Soft Viterbi Decoding
• Hidden Markov Models (HMMs)
• Lossy coding with psycho-acoustic modeling (ex:  MP3, AAC)
• Voice Activity Detection (VAD)

Tutorial and Instructional Services

• RF wireless design tutorials
• Engineering and marketing presentations

Wireless Communication Systems

• Broadband Wireless Communications
• Forward Error Correction (FEC)
• Hard/Soft Viterbi Decoding
• Spread Spectrum Communications
• Orthogonal Frequency Division Multiplexing (OFDM)
• FSK Modems
• GPS Radio
• Phase Lock Loops (PLL)
• Packet detection algorithms
• Cell capacity analysis and simulation
• End-to-End Simulation of Analog and Digital Radio Components including:
  • 802.11a/b/g OFDM and CCK
  • GMSK modems
  • GPS radio receiver
  • Bluetooth radio
  • Adaptive 3G
  • Inmarsat SatCom 21Kbps QPSK

Voice over IP (VoIP)

• ITU-T H.323
• IETF Session Initiation Protocol (SIP)
• IETF Real-Time Transfer Protocol (RTP)