Sliding correlators are widely used in the measurement of channel characteristics, but large delay fading in the aeronautical telemetry channel severely limits the performance of the measurement system, and even cause the system to be unable to complete the measurement. To measure aeronautical telemetry channels more accurately, this paper proposes a sliding correlator based on Zadoff-Chu(ZC) sequences. The channel sounding ability of the correlator in the measurement system of aeronautical telemetry channels is studied. Different from traditional analysis methods, the analytical expression of each interference component in the measurement system is first given from the frequency domain. Second, the average dynamic range in the multipath environment is given. Finally, the influence of each interference component on the measurement performance is analyzed based on the simulation of the ZC sequence root, normalized sliding factor, Signal-to-Noise Ratio(SNR) and measurement sequence length. Simulation results show that the proposed sliding correlator can suppress obviously the interference caused by additive noise. Moreover, when the normalized sliding factor is greater than 2 and the SNR is greater than 10 dB, the measurement performance of the correlator proposed is at least 2 dB higher than that of the traditional sliding correlator. Therefore, the sliding correlation peak of the sliding correlator proposed is more obvious, so the correlator is more conducive to detection of each multipath component in the aeronautical telemetry channel.
LI Sai
,
DANG Xiaoyu
,
HAO Chongzheng
,
LI Jie
. Improved aeronautical telemetry channel sounding[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2022
, 43(1)
: 324881
-324881
.
DOI: 10.7527/S1000-6893.2020.24881
[1] KHUWAJA A A, CHEN Y F, ZHAO N, et al. A survey of channel modeling for UAV communications[J]. IEEE Communications Surveys & Tutorials, 2018, 20(4): 2804-2821.
[2] 左沅君, 李峭, 熊华钢, 等. 航空电子MB-OFDM-UWB无线互连信道分析与仿真[J]. 航空学报, 2019, 40(7): 322739. ZUO Y J, LI Q, XIONG H G, et al. Analysis and simulation of avionics MB-OFDM-UWB wireless interconnection channel[J]. Acta Aeronautica et Astronautica Sinica, 2019, 40(7): 322739(in Chinese).
[3] 张巍, 段冀新, 巩朝阳, 等. 无人机通信信道模型仿真分析[J]. 中国新通信, 2016, 18(16): 54-55. ZHANG W, DUAN J X, GONG Z Y, et al. Simulation analysis of UAV communication channel model[J]. China New Telecommunications, 2016, 18(16): 54-55(in Chinese).
[4] RAPPAPORT T S, XING Y C, KANHERE O, et al. Wireless communications and applications above 100 GHz: Opportunities and challenges for 6G and beyond[J]. IEEE Access, 2019, 7: 78729-78757.
[5] COX D. Delay Doppler characteristics of multipath propagation at 910 MHz in a suburban mobile radio environment[J]. IEEE Transactions on Antennas and Propagation, 1972, 20(5): 625-635.
[6] HUR S, BAEK S, KIM B, et al. Proposal on millimeter-wave channel modeling for 5G cellular system[J]. IEEE Journal of Selected Topics in Signal Processing, 2016, 10(3): 454-469.
[7] RAPPAPORT T S, MACCARTNEY G R, SAMIMI M K, et al. Wideband millimeter-wave propagation measurements and channel models for future wireless communication system design[J]. IEEE Transactions on Communications, 2015, 63(9): 3029-3056.
[8] MACCARTNEY G R, RAPPAPORT T S. A flexible millimeter-wave channel sounder with absolute timing[J]. IEEE Journal on Selected Areas in Communications, 2017, 35(6): 1402-1418.
[9] FANNIN P C, MOLINA A. Accuracy and dynamic range improvement of bandpass impulse response measurements using pseudorandom noise[J]. Electronics Letters, 1991, 27(19): 1755.
[10] CHENG L, HENTY B, COOPER R, et al. Multi-path propagation measurements for vehicular networks at 5.9 GHz[C]//2008 IEEE Wireless Communications and Networking Conference. Piscataway: IEEE Press, 2008: 1239-1244.
[11] COOPER R L, STANCIL D D. Improved channel sounding using zero correlation zone sequences[C]//GLOBECOM 2009-2009 IEEE Global Telecommunications Conference. Piscataway: IEEE Press, 2009: 1-6.
[12] WU X Y, WANG C X, SUN J, et al. 60-GHz millimeter-wave channel measurements and modeling for indoor office environments[J]. IEEE Transactions on Antennas and Propagation, 2017, 65(4): 1912-1924.
[13] VAZQUEZ A A, GARCIA S M, CUINAS G I. Benefits of using Golay sequences in channel swept time cross-correlation sounders[C]//2005 European Microwave Conference. Piscataway: IEEE Press, 2005: 1204-1206.
[14] RICE M, DAVIS A, BETTWEISER C. Wideband channel model for aeronautical telemetry[J]. IEEE Transactions on Aerospace and Electronic Systems, 2004, 40(1): 57-69.
[15] CHU D. Polyphase codes with good periodic correlation properties (Corresp.)[J]. IEEE Transactions on Information Theory, 1972, 18(4): 531-532.
[16] 孙虎, 胡方明, 杜强. 基于ZC序列的OFDM同步及稀疏信道估计算法[J]. 华中科技大学学报(自然科学版), 2013, 41(10): 6-10. SUN H, HU F M, DU Q. OFDM synchronization and sparse channel estimation algorithm based on ZC sequence[J]. Journal of Huazhong University of Science and Technology (Natural Science Edition), 2013, 41(10): 6-10(in Chinese).
[17] 王丹, 张怡凡, 杜颜敏. 超高速模式下随机接入前导检测算法[J]. 南京邮电大学学报(自然科学版), 2019, 39(3): 39-44. WANG D, ZHANG Y F, DU Y M. Random access preamble detection algorithm in super high speed mode[J]. Journal of Nanjing University of Posts and Telecommunications (Natural Science Edition), 2019, 39(3): 39-44(in Chinese).
[18] 3GPP. Evolved Universal Terrestrial Radio Access(E-UTRA): TS 36.211[S]. 2019.
[19] GUL M M U, MA X L, LEE S. Timing and frequency synchronization for OFDM downlink transmissions using zadoff-Chu sequences[J]. IEEE Transactions on Wireless Communications, 2015, 14(3): 1716-1729.
[20] BENVENUTO N. Distortion analysis on measuring the impulse response of a system using a crosscorrelation method[J]. AT&T Bell Laboratories Technical Journal, 1984, 63(10): 2171-2192.
[21] PIRKL R J, DURGIN G D. Optimal sliding correlator channel sounder design[J]. IEEE Transactions on Wireless Communications, 2008, 7(9): 3488-3497.
[22] TALVITIE J, POUTANEN T. Self-noise as a factor limiting the dynamic range in impulse response measurements using sliding correlation[C]//Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications(ISSSTA’94). Piscataway: IEEE Press, 1994: 619-623.
[23] MARTIN G. Wideband channel sounding dynamic range using a sliding correlator[C]//VTC2000-Spring.2000 IEEE 51 st Vehicular Technology Conference Proceedings(Cat. No.00CH37026). Piscataway: IEEE Press, 2000: 2517-2521.
[24] RICE M, GAGAKUMA E. Approximate MLSE equalization of SOQPSK-TG in aeronautical telemetry[J]. IEEE Transactions on Aerospace and Electronic Systems, 2019, 55(2): 769-784.
CJA