| Co-Investigator(Kenkyū-buntansha) |
SANADA Yokitoshi Sony Copmuter Science Laboratories, Researcher, 研究員 (90293042)
TAKADA Jun-ichi Tokyo Institute of Technology, Graduate School of Science and Engineering, Associate Professor, 大学院・理工学研究科, 助教授 (90222083)
ARAKI Kiyomichi Tokyo Institute of Technology, Graduate School of Science and Engineering, Professor, 大学院・理工学研究科, 教授 (90016668)
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| Research Abstract |
This research investigates the software radio technology that will be very effective for sophisticated implementation of future radio sets for mobile communications. This report considers especially on the radio signal processing techniques, and clarifies several important future techniques that include the adaptive equalizer, adaptive interference canceller, OFDM signal transmission, and radio simulator implementation.
First, Bit Error Rate (BER) performance of the adaptive equalizer in mobile radio environments is theoretically analyzed. The analysis employed the RLS-MLSE equalizer that is very effective under the fast time-varying fading conditions. It is shown that the average BER performance of the computer simulation agrees well with the one derived theoretically by showing equivalence of operation principles of the equalizer and the maximal ratio combining diversity.
Next, the BER performance of the Minimum Mean Square Error (MMSE) adaptive array is analyzed under the incident ang
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le spread to the array. The spread is assumed to be Gaussian. The correlation matrix of the received signal is strictly derived, and utilized for BER performance derivation. The results are very useful for discussing antenna arrangement.
The report proposes a carrier recovery method for OFDM coherent detection. Theoretical analysis derived a recursive algorithm for real-time estimation of amplitude and phase of the delay profile components by using a scattered pilot signal. Computer simulation evaluates BER performance in the mobile radio environments, and shows some problems that remain.
Finally, simulator specifications for developing software defined radio technology are discussed and demonstrated. The simulator is implemented by using general-purpose board and modules. These boards are installed and carefully adjusted so as they can achieve the specified performance. A lot of required know-how is accumulated. Implemented parts are modulator, noise generator, fading simulator, and receiver unit. DSP assembler codes are written for decision feedback equalizer, MLSE equalizer, MLSE interference canceller, and experiments verify their effectiveness. Less
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