Abstract
AbstractOn the way towards third generation personal communication networks (PCN) the deployment of 16‐level quadrature amplitude modulation (QAM) schemes is investigated via flat microcellular Rayleigh‐fading mobile radio channels having mild co‐channel interference with and without diversity. Our proposed differentially coded non‐coherent 16‐QAM scheme requires no pilot symbol assistance, no automatic gain control (AGO and no carrier recovery. High speech quality associated with a mean opinion score of about four (MOS = 4.0) is ensured at a signalling rate of 6.2 kBd for channel signal to noise ratios (SNR) above 20 ‐ 25 dB and signal to interference ratios (SIR) above 25 ‐ 30 dB by the 13.4 kbit/s medium complexity regular pulse excited (RPE) speech codec, when carefully matched twin‐class low complexity binary Bose‐Chaudhuri‐Hocquenghem (BCH) error correction coding and 16‐QAM combined with second order diversity are deployed. The overall speech delay is about 40 ms and the user bandwidth is 9.3 kHz, which allows us to accommodate 21 users in a 200 kHz channel slot.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.