Re: Japan's Personal Handyphone Systems

[Stephen Wolff <swolff () cisco com>]

The June '95 issue of IEEE Communications Magazine (Vol. 33, No. 6) is
devoted to "Mobility in INtelligent Networks".  The first article,
"Emerging Mobile and Personal Communication Systems" by Raj Pandya of BNR,
has a section on Cordless Telecommunications that compares and contrasts
the UK-originated CT2, the Japanese PHS, and the European DECT standards,
along with a (IMHO) somewhat muddled US approach.


Of particular interest for those of us with short attention spans is Table
2 on p. 48 which I excerpt below:


                               CT2              DECT               PHS


Access method               FDMA/TDD          TDMA/TDD          TDMA/TDD
Spectrum allocation (MHz)   864-868          1880-1900         1895-1918
Carrier spacing (KHz)         100               1728              300
Number of carriers             40                10                77
Channels/carrier               1                 12                4
Modulation                    GFSK              GFSK        pi/4 shifted QPSK
Transmission rate (Kb/s)       72               1152              384
Speech coding               <----------------32 Kb/s ADPCM---------------->
Frame duration (ms)            2                 10                5
Peak output power (mW)         10                250               10


Cheers,  -s


Stephen Wolff                       Business Development
Cisco Systems                       703-715-4075(V), -4044(F)