研究目的
Investigating the performance of broadband millimeter-wave (mm-wave) OFDM systems in the presence of phase noise and delay spread of measured mm-wave channel.
研究成果
Effective PN mitigation scheme can be used to solve the dilemma of reducing the subcarrier spacing reducing the CP overhead, yet making the system more vulnerable to PN, allowing the OFDM system to operate at small subcarrier spacing with little degradation of the BER performance.
研究不足
The model becomes less accurate for more than 100 MHz bandwidth. The assumption that channel coefficient at each (delay) tap follows Gaussian distribution does not hold for broadband mm-wave channel.
1：Experimental Design and Method Selection:
The performance of mm-wave OFDM systems is evaluated using emulated phase noise of a PLL-based oscillator and measured mm-wave channel. The methodology includes the use of Akaike’s information criterion to study the amplitude distribution of the channel tap.
2：Sample Selection and Data Sources:
Measurements of the mm-wave channel were conducted in a basement in a line-of-sight (LOS) scenario using a vector network analyzer (VNA) based channel sounder.
3：List of Experimental Equipment and Materials:
Vertically polarized wideband biconical antennas were used as the transmit and receive antennas, respectively. A positioning turntable was used to move the receive antenna.
4：Experimental Procedures and Operational Workflow:
The CTF from 28 to 30 GHz with 750 frequency points was measured. The CIR is obtained by performing a DFT of the Hamming windowed CTF.
5：Data Analysis Methods:
The Akaike’s information criterion (AIC) is used to study the amplitude distribution of the channel tap. The performance of the OFDM system is evaluated in terms of bit-error-rate (BER) performance as a function of signal-to-noise ratio (SNR).
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