CAJ | 학술논문

研究适用于分布式MIMO无线通信信道测量系统的低峰均功率比导频信号优化方法和低复杂度多天线信号发送方案．为使发送信号的峰均功率比最低，采用OFDM技术，根据导频的长度、离散傅里叶变换的尺寸和子载波的映射方式，搜索最优的恒模零自相关（CAZAC）序列作为基序列．由最优基序列生成的OFDM发送信号峰均功率比低至2.556 dB．对第1根天线发送信号的采样点逐个移相，就可生成其余多根天线的发送信号．为支持分布式MIMO信道测量，采用所设计的信号帧格式的发送信号在时域和频域都可分离．与现有方案相比，所提出方案具有发送信号峰均功率比小和实现复杂度低的优点．
연구괄용우분포식MIMO무선통신신도측량계통적저봉균공솔비도빈신호우화방법화저복잡도다천선신호발송방안．위사발송신호적봉균공솔비최저，채용OFDM기술，근거도빈적장도、리산부리협변환적척촌화자재파적영사방식，수색최우적항모령자상관（CAZAC）서렬작위기서렬．유최우기서렬생성적OFDM발송신호봉균공솔비저지2.556 dB．대제1근천선발송신호적채양점축개이상，취가생성기여다근천선적발송신호．위지지분포식MIMO신도측량，채용소설계적신호정격식적발송신호재시역화빈역도가분리．여현유방안상비，소제출방안구유발송신호봉균공솔비소화실현복잡도저적우점．
A low peak-to-average power ratio (PAPR)pilot signal optimization method and a low-complexity multiple-antenna transmit signal scheme are investigated for channel measurement systems of distributed multiple-input multiple-output (MIMO)wireless communications.To make the PAPR of the transmit signal be lowest,using the orthogonal frequency division multiplexing (OFDM) technique,the optimal constant amplitude zero auto-correlation (CAZAC)sequence is obtained ac-cording to the pilot length,the size of discrete Fourier transform,and the sub-carrier mapping scheme.Using the optimal CAZAC sequence as a base sequence,the transmit OFDM signal has the PAPR as low as 2.556 dB.By shifting the phase of each sample in the signal for the first transmit antenna,the signals for other transmit antennas are generated.For supporting distributed MIMO channel measurements,the transmit signals using the proposed frame structure are separable in both the time domain and the frequency domain.The proposed scheme has the merits of low-PAPR trans-mit signal and low-complexity implementation compared with the existing schemes.