Hitoshi TAKAI
In-Room Transmission BER Performance of Anti-Multipath Modulation PSK-VP
Abstract:This paper evaluates the BER performance of anti-multipath modulation
π/4-QPSK-VP(symmetrically-mapped 4-ary PSK-VP) when applied to highspeed
digital transmission within a room where both transmitting and receiving
antennas are set up, and compares it with the conventional differential
π/4-QPSK(symmetrically-mapped 4-ary PSK), via a transmission experiment
and a calculation based on a channel model. Through this transmission experiment
at about 3 and 6 Mbps, π/4-QPSK-VP is observed to improve the BER
significantly over applied channels for both data-rates. Delay-profile measurement
is also done using the PN correlation method and its high-resolution
technique SPM. The physical channel model with only one measured parameter
is proposed to explain the delay-profile measurement results. The BER
calculation results based on the physical channel model are compared with the
transmission experiment results, revealing that the BER calculation procedure
adequately estimates the worst-case BER. The BER calculation also indicates
the relationship between data-rate and BER. It is shown that π/4-QPSK-VP
raises the maximum available data-rate, about 10 Mbps in an ordinary office
room, about ten times over that of conventional π/4-QPSK.