Title :
Spectral efficient modulation schemes in a SFH-TDMA orthogonal frequency division multiplexing (OFDM) wireless communication system to support advanced services
Author :
Böhnke, Ralf ; Suzuki, Mitsuhiro ; Sakoda, Kazuyuki
Abstract :
An OFDM based wireless communication system with `slow frequency hopping´ (SFH) and TDMA is proposed. SFH-TDMA was found to be superior in performance compared to CDMA regarding intra-cell interference and simple TDMA regarding interference and frequency diversity. OFDM supports a high spectral efficiency and superior performance in various channel profiles without the need for complex equalising in any delay profile. Modulation schemes were developed to support specific C/I conditions for different environments (e.g. office, vehicular) and optimise the system capacity, spectral efficiency and data throughput. We compare coherent (4-PSK, 16-QAM and 64-QAM) and non-coherent (DQPSK, D8PSK, 16-DAPSK) modulation schemes in combination with variable forward error correction to support advanced services. Results of the research are proposed for the standardisation of the 3rd generation mobile communication system in Europe and Japan
Keywords :
OFDM modulation; channel allocation; channel capacity; code division multiple access; diversity reception; forward error correction; frequency hop communication; land mobile radio; phase shift keying; quadrature amplitude modulation; radiofrequency interference; time division multiple access; 16-DAPSK; 16-QAM; 4-PSK; 64-QAM; C/I conditions; D8PSK; DQPSK; Europe; Japan; OFDM wireless communication system; SFH-TDMA; channel allocation; channel profiles; coherent modulation; data throughput; delay profile; frequency diversity; high spectral efficiency; intra-cell interference; noncoherent modulation; orthogonal frequency division multiplexing; performance; slow frequency hopping; standardisation; system capacity; third generation mobile communication system; variable forward error correction; Delay; Frequency diversity; Interference; Multiaccess communication; OFDM modulation; Quadrature phase shift keying; Spread spectrum communication; Throughput; Time division multiple access; Wireless communication;
Conference_Titel :
Vehicular Technology Conference, 1998. VTC 98. 48th IEEE
Conference_Location :
Ottawa, Ont.
Print_ISBN :
0-7803-4320-4
DOI :
10.1109/VETEC.1998.686148
