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Real-time in situ signal-to-noise ratio estimation for the assessment of operational communications links
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Manning, Robert M. |
| Copyright Year | 2002 |
| Description | The work presented here formulates the rigorous statistical basis for the correct estimation of communication link SNR of a BPSK, QPSK, and for that matter, any M-ary phase-modulated digital signal from what is known about its statistical behavior at the output of the receiver demodulator. Many methods to accomplish this have been proposed and implemented in the past but all of them are based on tacit and unwarranted assumptions and are thus defective. However, the basic idea is well founded, i.e., the signal at the output of a communications demodulator has convolved within it the prevailing SNR characteristic of the link. The acquisition of the SNR characteristic is of the utmost importance to a communications system that must remain reliable in adverse propagation conditions. This work provides a correct and consistent mathematical basis for the proper statistical 'deconvolution' of the output of a demodulator to yield a measure of the SNR. The use of such techniques will alleviate the need and expense for a separate propagation link to assess the propagation conditions prevailing on the communications link. Furthermore, they are applicable for every situation involving the digital transmission of data over planetary and space communications links. |
| File Size | 730696 |
| Page Count | 17 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20020082947 |
| Archival Resource Key | ark:/13960/t3cz85m1b |
| Language | English |
| Publisher Date | 2002-08-01 |
| Access Restriction | Open |
| Subject Keyword | Aircraft Communications And Navigation Data Links Phase Shift Keying Phase Modulation Signal To Noise Ratios Demodulators Space Communication Communication Networks Digital Data Real Time Operation Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
