Near-toll quality digital speech transmission in the mobile satellite serviceThis paper discusses system considerations for near-toll quality digital speech transmission in a 5 kHz mobile satellite system channel. Tradeoffs are shown for power performance versus delay for a 4800 bps speech compression system in conjunction with a 16 state rate 2/3 trellis coded 8PSK modulation system. The suggested system has an additional 150 ms of delay beyond the propagation delay and requires an E(b)/N(0) of about 7 dB for a Ricean channel assumption with line-of-sight to diffuse component ratio of 10 assuming ideal synchronization. An additional loss of 2 to 3 dB is expected for synchronization in fading environment.
Document ID
19870043502
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Townes, S. A. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Divsalar, D. (California Institute of Technology Jet Propulsion Laboratory, Pasadena, United States)