Space-code division multiple access for broadband acoustic networks

被引:0
作者
Li, Zhengnan [1 ]
Cuji, Diego A. [1 ]
Stojanovic, Milica [1 ]
机构
[1] Northeastern Univ, Boston, MA 02115 USA
关键词
SDMA; CDMA; OFDM; Broadband beamforming; Underwater acoustic networks;
D O I
10.1016/j.comnet.2024.110407
中图分类号
TP3 [计算技术、计算机技术];
学科分类号
0812 ;
摘要
We present an investigation into the design of an acoustic communication network, where multiple users are distributed across space and transmit and receive simultaneously in the same band to and from a common base station. Specifically, we focus on a system that utilizes orthogonal frequency division multiplexing as a modulation method, and allows users to transmit and receive in either synchronous or asynchronous fashion. To distinguish between users on the uplink, the base station employs a combination of code -division and space -division multiple access. The base station iteratively steers a beam to each stable propagation path of the desired user's channel while placing nulls in the direction of other paths, as well as in the directions of interfering users. Finally, the multiple paths of the desired user are recombined before data detection. The process is repeated for each user. Broadband beamforming is employed to account for the broadband nature of acoustic signals. The beamformer coefficients on each carrier depend on the angles of signal arrivals, which are estimated during the uplink transmission and used to construct both the uplink and the downlink beamformer. On the downlink, the base station utilizes angle information to assemble beamforming weights and point in the direction of stable paths of the users. It superimposes multiuser signals and transmits the sum signal to the users. The signal intended for a given user reaches only that user, requiring just a simple detector. Each user is equipped by a single -element transducer. To demonstrate the design concepts, we conducted simulations using a shallow water channel model and performed experimental over -the -air tests in an indoor environment using an acoustic communications testbed. The results were excellent, thereby encouraging future implementations in practical systems.
引用
收藏
页数:11
相关论文
共 24 条
  • [1] Optimal Multiuser Transmit Beamforming: A Difficult Problem with a Simple Solution Structure
    Bjornson, Emil
    Bengtsson, Mats
    Ottersten, Bjorn
    [J]. IEEE SIGNAL PROCESSING MAGAZINE, 2014, 31 (04) : 142 - 148
  • [2] Transmit Beamforming for Underwater Acoustic OFDM Systems
    Cuji, Diego A.
    Stojanovic, Milica
    [J]. IEEE JOURNAL OF OCEANIC ENGINEERING, 2024, 49 (01) : 145 - 162
  • [3] Multi-user Communications for Acoustic OFDM: A Broadband Beamforming Approach
    Cuji, Diego A.
    Li, Zhengnan
    Stojanovic, Milica
    [J]. 2022 SIXTH UNDERWATER COMMUNICATIONS AND NETWORKING CONFERENCE (UCOMMS), 2022,
  • [4] ACT: an Acoustic Communications Testbed
    Cuji, Diego A.
    Li, Zhengnan
    Stojanovic, Milica
    [J]. IEEE INFOCOM 2022 - IEEE CONFERENCE ON COMPUTER COMMUNICATIONS WORKSHOPS (INFOCOM WKSHPS), 2022,
  • [5] Underwater acoustic communications using time reversal
    Edelmann, GF
    Song, HC
    Kim, S
    Hodgkiss, WS
    Kuperman, WA
    Akal, T
    [J]. IEEE JOURNAL OF OCEANIC ENGINEERING, 2005, 30 (04) : 852 - 864
  • [6] An initial demonstration of underwater acoustic communication using time reversal
    Edelmann, GF
    Akal, T
    Hodgkiss, WS
    Kim, S
    Kuperman, WA
    Song, HC
    [J]. IEEE JOURNAL OF OCEANIC ENGINEERING, 2002, 27 (03) : 602 - 609
  • [7] Egnor D., 2008, OCEANS '08, P1, DOI [10.1109/OCEANS.2008.5152011, DOI 10.1109/OCEANS.2008.5152011]
  • [8] PERFORMANCE ANALYSIS OF A NULL-STEERING ALGORITHM BASED ON DIRECTION-OF-ARRIVAL ESTIMATION
    FRIEDLANDER, B
    PORAT, B
    [J]. IEEE TRANSACTIONS ON ACOUSTICS SPEECH AND SIGNAL PROCESSING, 1989, 37 (04): : 461 - 466
  • [9] A Variable-Rate Spread-Spectrum System for Underwater Acoustic Communications
    He, Chengbing
    Huang, Jianguo
    Ding, Zhi
    [J]. IEEE JOURNAL OF OCEANIC ENGINEERING, 2009, 34 (04) : 624 - 633
  • [10] Performance of Spread Spectrum Based Multi-Carrier System in Underwater Communication Using Transmitter Pre-Processing
    Iruthayanathan, Nelson
    Vishvaksenan, Kuttathati Srinivasan
    Rajendran, Velayutham
    [J]. IEEE ACCESS, 2016, 4 : 5128 - 5134