R&S®CA250 Bit Stream Analysis

Analysis and manipulation of signals at bitstream/symbol stream level

Key facts

  • Import of various symbol stream/bit stream formats
  • Symbol-to-bit mapping and bit stream representation
  • Versatile bitstream analysis functions

Brief description

In the field of technical analysis of modern communications signals, the ability to analyze the characteristics of demodulated signals with unknown codings is of major importance.

Features

  • Versatile data import and symbol stream/bit stream representation
  • Versatile bit stream analysis functions
  • Advanced code analysis functions

Specifications

Options Version
R&S®CA250-E Extended Bit Stream Analysis and Decoding
R&S®CA250-P Professional Bit Stream Analysis and Decoding
R&S®CA250-CA Code Analysis

Key facts

  • Import of various symbol stream/bit stream formats
  • Symbol-to-bit mapping and bit stream representation
  • Versatile bitstream analysis functions
  • Wide variety of bit manipulation functions
  • Integration of user-specific algorithms into the R&S®CA250 operation sequences
  • Programmable script control for performing automatic analysis sequences

Brief description

In the field of technical analysis of modern communications signals, the ability to analyze the characteristics of demodulated signals with unknown codings is of major importance. In addition to various symbol stream/bitstream representations, R&S®CA250 provides a large number of powerful analysis algorithms and bitstream manipulation functions.

By selectively using these tools, the user can obtain technical data from the unknown bit stream. This data provides information about the type and content of the analyzed signal. Ideally, it is possible to resolve all aspects of the unknown code, thereby allowing the user to program a specific decoder for the unknown signal (e.g. by using the R&S®GX400ID decoder development environment).

Features & Benefits

  • Versatile data import and symbol stream/bitstream representation
    • Import of various symbol stream/bitstream formats
    • Symbol-to-bit mapping and bitstream representation as 0/1 and -/X representation as well as graphical visualization
  • Versatile bitstream analysis functions
    • Structure analysis
    • Statistical methods
  • Advanced code analysis functions
    • Automatic recognition of channel codings (convolutional, Reed-Solomon codes, etc.)
    • Manual expert analysis tools
  • Wide variety of processing functions for channel-coded bitstreams
    • Standard manipulation such as deletion, inversion, multiplexing and demultiplexing
    • Complex bitstream processing methods such as descrambling and deinterleaving
    • Processing of channel codings (convolutional, Reed-Solomon and other codes)
  • Payload analysis and processing
    • Automatic detection of typical payload structures
    • Various alphabets
    • Digital voice codecs
    • Processing of compressed data
  • Automation, extensibility and versatility
    • Integration of user-specific algorithms into the R&S®CA250 operation sequences
    • Programmable script control for performing automatic analysis sequences
    • Various user-configurable and extensible functions

Specifications

R&S®CA250 bitstream analysis
Analysis algorithms Autocorrelation
  Cross-correlation
  Configurable pattern search
  Tsallis entropy
  Maurer test
  Chi-square test
  Histogram
  Calculation of column sum/parity
  Calculation of line sum/parity
 
automatic peak and notch detection for diagrams
Decoder and manipulation functions Symbol-to-bit conversion
  Conversion of differential coding to absolute coding
  Line codes
     NRZ-L
     NRZ-M
     NRZ-S
  Boolean operations
  Multiplexing
  basic demultiplexing
  Extract items
  Symbol-to-symbol mapper
  Symbol adder
  Channel serialization
  ASCII alphabet
  Baudot (ITA2) alphabet
  ITA3 alphabet
  ITA476-5 alphabet
  ITA2-P alphabet
  RUM-FEC alphabet
  HNG-FEC alphabet
  Varicode alphabet
  Huffmann alphabet
  user-defined alphabets
Representation Symbol stream/bitstream in tabular form
     Decimal representation (0/1)
     Hexadecimal representation
     –/X representation
     Graphical visualization
     Display of demodulation quality as color-coded background
     Tags for start-of-burst
     Tags for the first channel (in multichannel methods)
     Zoom functions
  Line charts
  Window for displaying decoded text
  tabular data display for analysis and protocol data
System functions Generation of reports in XML format (compatible with R&S®ReportEdit)
Recommended computer equipment
Operating system Windows
CPU (minimum) Intel Pentium IV, 3 GHz
Memory (minimum) 1 Gbyte
Graphics card OpenGL 1.4 capable
Hard disk memory (minimum) 500 Mbyte (for installing R&S®CA250)
Minimum screen resolution 1024 pixel × 768 pixel
Sound playback Sound card
R&S®CA250-E extended bitstream analysis
Analysis algorithms Search for CRC codes
  Search for BCH codes
  Search for Reed-Solomon codes
  Analysis of rate 1/N convolutional codes
  Analysis of 1/N to rate K/N punctured convolutional codes
  Analysis of rate K/N convolutional codes
  Search for the most common polynomials
Decoder and manipulation functions Block interleaving
  Block interleaver with skip bits
  Cross interleaving
  Convolutional interleaving
  Helical interleaving
  CRC decoder
  BCH decoder
  Reed-Solomon decoder
  Viterbi decoder with/without puncturing
  Golay decoder
  bit destuffing
R&S®CA250-P professional bitstream analysis
Analysis algorithms Analysis of additive scrambling
  Analysis of multiplicative scrambling
  Analysis of spread spectrum code (DSSS)
Decoder and manipulation functions Additive descrambling
  Multiplicative descrambling
  Despreader
  A-law/μ-law voice codec (in line with ITU G.711)
  ADPCM voice codec (in line with ITU G.726)
  LD-CELP voice codec (in line with ITU G.728)
  CVSD voice codec (in line with STANAG 4209)
  LPC-10 voice codec (in line with STANAG 4198)
  MELP voice codec (in line with STANAG 4591)
Representation Audio player for playing back decoded voice codecs
R&S®CA250-PA payload analysis
Analysis algorithms bit-error-tolerant file detection
Decoder and manipulation functions LZRW1-3
  Deflate
  UUDecode
  Sequence generator
R&S®CA250-CA code analysis
Analysis algorithms code classifier
 
bit-error-tolerant convolutional code analysis
  polynomial factorization
  polynomial division
  greatest common divisor
 
code word statistics (mean value, variance)
  minimum distance analysis
  uniform sequence length analysis
Decoder and manipulation functions advanced demultiplexing
  descrambling (in line with ITU-T V.35)
 
convolutional decoder (in line with IESS.303)
  LDPC decoder
  repetition decoder
  Walsh decoder
R&S®CA250-D development edition
System functions
application automation via script control (Python)
 
linking of customer-specific algorithms via
Windows DLL interface
R&S®CA250-U licensing option
Option for licensing R&S®CA250 with a USB dongle with 2 Gbyte additional memory
Interface USB 2.0
Dimensions (W × H × D) 8 mm × 16 mm × 52.5 mm (0.31 in × 0.63 in × 2.07 in)
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