Receiver windowing for FDM MFSK signals
Abstract
Frequency division multiplexed, orthogonal M-ary FSK modulated signals transmitted over a frequency hopping channel (with one channel use per hop) interfere with each other unless perfectly synchronized in time and frequency with the receiver. In order to maintain the interfering 'crosstalk' energy at harmless levels, even in the case of grossly power unbalanced users, the frequency separation between assigned signaling frequencies must be expanded beyond the orthogonal spacing. It is found that the required bandwidth expansion can be significantly reduced by amplitude windowing at the receiver, at a cost of a slight decrease in detectability. This effect is evident through examination of both worst case, single source crosstalk and average, multiple user crosstalk.
- Publication:
-
IEEE Transactions on Communications
- Pub Date:
- October 1979
- Bibcode:
- 1979ITCom..27.1519M
- Keywords:
-
- Crosstalk;
- Frequency Division Multiplexing;
- Frequency Shift Keying;
- Noise Reduction;
- Radio Receivers;
- Transmission Efficiency;
- Bandwidth;
- Electromagnetic Compatibility;
- Multichannel Communication;
- Radio Frequency Interference;
- Satellite Transmission;
- Signal Transmission;
- Windows (Intervals);
- Communications and Radar