Blind Channel Estimate Via Per Survivor Processing

Period of Performance: 02/02/1998 - 02/02/2000


Phase 2 SBIR

Recipient Firm

Viasat, Inc.
2290 Cosmos Court
Carlsbad, CA 92009
Principal Investigator


A recent innovation called Per Survivor Processing (PSP) offers the opportunity to achieve dramatic improvements digitally in a wide variety of communications applications, both government and commercial. PSP allows unaided estimation of the channel, as well as potentially the waveform structure (e.g. correlation over time or error correction coding), when the channel is unknown due to geometry, noise, time varying parameters, or interference/jamming. Phase I developed atop level design and evaluated current technology to show that PSP can be implemented within reasonable size, weight, power and cost. In Phase II ViaSat intends to validate that PSP can be practically implemented by designing and building a proof of concept prototype and doing an over the air demonstration. A major goal will be to make the prototype programmable enough to accommodate a variety of applications. Phase I performance analysis, which showed the potential to achieve an order of magnitude performance improvement in many cases, will also be verified with further simulation and prototype tests. In addition, Phase II will extend the Phase I analysis to better account for real world constraints such as timing synchronization and cochannel interference. BENEFITS: Numerous high potential applications exist for commercializing the results of this research. In the area of satellite communications it promises to greatly enhance the performance of VSAT terminals with high phase noise, Trellis Coded Modulation approaches to higher data rates, and Low Earth Orbiting communication systems. It is also potentially applicable to terrestrial communications such as SINCGARS and commercial cellular, especially in mobile scenarios. In particular IS-54 and GSM will be investigated.