Title :
Proposal of an alternate M-sequence spread spectrum system
Author :
Kuroyanagi, Noriyoshi ; Guo, Lili
Author_Institution :
Tokyo Eng. Univ., Japan
Abstract :
The authors propose a spreading sequence that expands the design flexibility of spread spectrum systems. This new sequence, called the AM-sequence is created by multiplying a short M-sequence by a line of an N × N Hadamard matrix. Because of the frequency characteristics and orthogonal functionality of a Hadamard matrix, each AM-sequence has frequency characteristics that do not have components duplicating those of other AM-sequences. There is therefore little mutual correlation between these derived sequences. This lack of correlation provides an effective method for avoiding the near-far problem or for overcoming narrowband interference in a spread spectrum mobile communications system. Various methods for composing AM-sequences are explored, and an experiment and correlation estimation are presented in order to show the effectiveness of AM-sequences in avoiding interference
Keywords :
Hadamard matrices; correlation theory; interference suppression; land mobile radio; military communication; radiofrequency interference; sequences; spread spectrum communication; alternate M-sequence spread spectrum system; correlation estimation; design flexibility; effectiveness; frequency characteristics; narrowband interference; near-far problem; orthogonal functionality; spread spectrum mobile communications; Buildings; Frequency; Interference; Marine vehicles; Mobile communication; Narrowband; Noise reduction; Proposals; Spread spectrum communication; Working environment noise;
Conference_Titel :
Military Communications Conference, 1993. MILCOM '93. Conference record. Communications on the Move., IEEE
Conference_Location :
Boston, MA
Print_ISBN :
0-7803-0953-7
DOI :
10.1109/MILCOM.1993.408549
