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Receiver Enhancement Applications

TrellisWare has applied its processing improvement techniques to enhance everything from individual processing elements of a receiver up to reconstructing entire receivers. The application of TrellisWare processing techniques (including PSP and AID) allows dramatic improvements at every step in the receiver chain, making possible capabilities beyond what is found in traditional receiver implementations.

The receiver is typically the most vulnerable part of a communication system design. Many application environments change rapidly – from communicating while going around corners in dense urban environments to communicating from a moving vehicle to another vehicle across town to communicating from a moving vehicle to a high speed aircraft. TrellisWare processing techniques can rapidly adapt the receiver to changing parameters in the environment. For example,

  • A phase lock loop (PLL) employing TrellisWare’s PSP can track roughly 10 times the dynamics at the same SNR as a conventional PLL design.
  • When movement distorts the signal reflection profiles in a given environment, PSP can enable highly efficient equalizer/demodulator combinations to combat the resulting fading encountered.
  • AID can improve receiver sensitivity significantly in high multipath environments by using the estimates of data values after error correction decoding iterating with the demodulator/equalizer.
  • By employing TrellisWare’s SAIC, GSM cellular performance can be improved 6dB in gain and 2 orders of magnitude in error floor when traveling at 50 kmph in typical urban fading environment.

Co-Channel Interference (CCI) mitigation provides another sample application that demonstrates the power of TrellisWare processing techniques in receiver processing. TrellisWare’s SAIC product enables discrimination of multiple signals of similar type with only a single antenna, even if the signal energy of the interference is greater than or equal to the energy of the signal of interest and the relative timing of the signals is unknown.

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PSP Phase Lock Loop (PLL) Bit Error Rate (BER) is compared to a conventional PLL at two different SNRs.

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GSM In a TU50 fading channel shows gains of 6 dB.

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PSP Phase Lock Loop (PLL) Bit Error Rate (BER) is compared to a conventional PLL at two different SNRs: 3.7 dB and 4.6 dB as a function of loop bandwidth, W. The rule of thumb for PLL’s says that the dynamics of the signal it can track are proportional to the square of W, thus about an order of magnitude.

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GSM In a TU50 fading channel shows gains of 6 dB compared to Conventional Adaptive Maximum Likelihood Sequence Estimation (CAMLSE) at the typical operating point and 2 orders of magnitude improvement in the error rate floor.