EVALUATION OF 16 KBIT/S DIGITAL VOICE TRANSMISSION FOR MOBILE RADIO
In this paper 16 kbit/s digital voice transmission with conventional channel spacing of 25 kHz, employing a 16 kbit/s adaptive delta modulation (ADM) coder-decoder (CODEC) is evaluated. The main characteristics of narrow-band digital FM modulation schemes, such as tamed FM, Gaussian filtered minimum shift keying (GMSK), four-level FM and phase locked loop-quaternary phase shift keying (PLL-QPSK), are compared by laboratory tests. Digitized voice quality in a digital channel incorporating a 16 kbit/s ADM CODEC and GMSK coherent detection was compared with voice quality of a conventional analog FM channel. Bit error ratio (BER) performance is shown to depend primarily on demodulation schemes. Digital voice quality is inferior to that of analog voice with an opinion score difference of about 0. 5 in fading environments. This kind of digital voice transmission will be applicable for those systems that require high security at an expense of speech quality.
-
Availability:
- Find a library where document is available. Order URL: http://worldcat.org/issn/00189545
-
Corporate Authors:
Institute of Electrical and Electronics Engineers (IEEE)
Operations Center, 445 Hoes Lane, P.O. Box 1331
Piscataway, NJ United States 08855-1331 -
Authors:
- Kinoshita, K
- Hata, M
- Nagabuchi, H
- Publication Date: 1984-11
Media Info
- Features: References;
- Pagination: p. 321-327
-
Serial:
- IEEE Transactions on Vehicular Technology
- Volume: VT-3
- Issue Number: 4
- Publisher: Institute of Electrical and Electronics Engineers (IEEE)
- ISSN: 0018-9545
- Serial URL: http://ieeexplore.ieee.org/xpl/mostRecentIssue.jsp?punumber=25
Subject/Index Terms
- TRT Terms: Digital computers; Frequency modulation; Mobile radio; Performance; Portable equipment; Security; Signal processing; Speech; Transmission; Voice communication
- Uncontrolled Terms: Digital techniques; Mobile equipment
- Old TRIS Terms: Adaptive delta modulation (Adm); Coder-decoder (Codec); Digital voice transmission; Frequency shift keying; Gaussian filtered minimum shift keying (Gmsk); Phase locked loop-quaternary phase shift keying (p; Radio systems (Mobile); Radio transmission
- Subject Areas: Highways; Security and Emergencies; Vehicles and Equipment; I91: Vehicle Design and Safety;
Filing Info
- Accession Number: 00395135
- Record Type: Publication
- Source Agency: Engineering Index
- Files: TRIS
- Created Date: Jul 31 1985 12:00AM