The original paper is in English. Non-English content has been machine-translated and may contain typographical errors or mistranslations. ex. Some numerals are expressed as "XNUMX".
Copyrights notice
The original paper is in English. Non-English content has been machine-translated and may contain typographical errors or mistranslations. Copyrights notice
Sistem mudah alih darat digital jalur sempit telah dibangunkan yang beroperasi dalam jalur frekuensi 150 dan 400 MHz, yang biasanya digunakan oleh syarikat berkaitan pengangkutan, kerajaan tempatan dan organisasi sektor awam--dan oleh itu sangat sesak. Bilangan pengguna yang boleh ditampung dalam jalur ini hampir dua kali ganda dengan mengurangkan pemisahan saluran kepada 6.25 kHz, kira-kira separuh daripada sistem FM konvensional. Kadar bit pembawa sebanyak 9.6 kbps dicapai dengan menggunakan modulasi QPSK anjakan π/4 dengan faktor pusingan 0.2. Ujian makmal dan lapangan menunjukkan bahawa: (1) Tanpa penyebaran kelewatan penyebaran, BER sebanyak 10-2 diperoleh tanpa menggunakan kepelbagaian ruang. (2) Dengan penyebaran kelewatan penyebaran sebanyak 10 µs, BER sebanyak 6
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Salinan
Eimatsu MORIYAMA, Yukiyoshi KAMIO, Kiyoshi HAMAGUCHI, "Development of Narrow-Band Digital Land Mobile Radio" in IEICE TRANSACTIONS on Communications,
vol. E83-B, no. 5, pp. 1094-1105, May 2000, doi: .
Abstract: A narrow-band digital land mobile system has been developed that operates in the frequency bands of 150 and 400 MHz, which are commonly used by transportation-related companies, local government, and public-sector organizations--and are therefore very congested. The number of users that can be accommodated in these bands is almost doubled by reducing the channel separation to 6.25 kHz, about half that of a conventional FM system. A carrier bit rate of 9.6 kbps is achieved by using π/4 shift QPSK modulation with a roll-off factor of 0.2. Laboratory and field testing showed that: (1) Without propagation delay spread, a BER of 10-2 was obtained without using space diversity. (2) With a propagation delay spread of 10 µs, a BER of 6
URL: https://global.ieice.org/en_transactions/communications/10.1587/e83-b_5_1094/_p
Salinan
@ARTICLE{e83-b_5_1094,
author={Eimatsu MORIYAMA, Yukiyoshi KAMIO, Kiyoshi HAMAGUCHI, },
journal={IEICE TRANSACTIONS on Communications},
title={Development of Narrow-Band Digital Land Mobile Radio},
year={2000},
volume={E83-B},
number={5},
pages={1094-1105},
abstract={A narrow-band digital land mobile system has been developed that operates in the frequency bands of 150 and 400 MHz, which are commonly used by transportation-related companies, local government, and public-sector organizations--and are therefore very congested. The number of users that can be accommodated in these bands is almost doubled by reducing the channel separation to 6.25 kHz, about half that of a conventional FM system. A carrier bit rate of 9.6 kbps is achieved by using π/4 shift QPSK modulation with a roll-off factor of 0.2. Laboratory and field testing showed that: (1) Without propagation delay spread, a BER of 10-2 was obtained without using space diversity. (2) With a propagation delay spread of 10 µs, a BER of 6
keywords={},
doi={},
ISSN={},
month={May},}
Salinan
TY - JOUR
TI - Development of Narrow-Band Digital Land Mobile Radio
T2 - IEICE TRANSACTIONS on Communications
SP - 1094
EP - 1105
AU - Eimatsu MORIYAMA
AU - Yukiyoshi KAMIO
AU - Kiyoshi HAMAGUCHI
PY - 2000
DO -
JO - IEICE TRANSACTIONS on Communications
SN -
VL - E83-B
IS - 5
JA - IEICE TRANSACTIONS on Communications
Y1 - May 2000
AB - A narrow-band digital land mobile system has been developed that operates in the frequency bands of 150 and 400 MHz, which are commonly used by transportation-related companies, local government, and public-sector organizations--and are therefore very congested. The number of users that can be accommodated in these bands is almost doubled by reducing the channel separation to 6.25 kHz, about half that of a conventional FM system. A carrier bit rate of 9.6 kbps is achieved by using π/4 shift QPSK modulation with a roll-off factor of 0.2. Laboratory and field testing showed that: (1) Without propagation delay spread, a BER of 10-2 was obtained without using space diversity. (2) With a propagation delay spread of 10 µs, a BER of 6
ER -