{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,12,3]],"date-time":"2025-12-03T20:38:12Z","timestamp":1764794292059},"reference-count":0,"publisher":"Engineering and Technology Publishing","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["jcm"],"published-print":{"date-parts":[[2022]]},"abstract":"<jats:p>The new product of wireless communication systems, the Fifth generation (5G), promises higher data rates and Spectrum Efficiency (SE) enhancements to support the communication of heterogeneous services. The Filtered-OFDM (F-OFDM) technique was proposed as the strongest candidate waveform for the physical layer in 5G to fulfill these requirements. In F-OFDM, the whole band is split into narrow sub-bands, each filtered by a digital Finite Impulse Response (FIR) filter with different specifications to increase the spectrum utilization and allow for asynchronous transmission. This paper proposes a novel F-OFDM design waveform for the first time with four sub-bands in equal and unequal sub-band sizes of seven kinds of window sinc filters and a variety of numerology designs to observe SE enhancement using Matlab-Simulink Software. Simulation results show that F-OFDM can reduce Out-Of-Band Emission (OOBE) and achieve SE of about (5%-6%) higher than conventional OFDM for equal and unequal sized sub-bands, respectively, by optimizing the guard band between the designed sub-bands, which achieves 5G guard band requirements.<\/jats:p>","DOI":"10.12720\/jcm.17.3.203-209","type":"journal-article","created":{"date-parts":[[2022,3,1]],"date-time":"2022-03-01T07:22:21Z","timestamp":1646119341000},"page":"203-209","source":"Crossref","is-referenced-by-count":3,"title":["Flexible Sub-bands F-OFDM Configured for Spectrum Efficiency Enhancement in 5G System"],"prefix":"10.12720","author":[{"name":"Coll. of Electronics Eng. Ninevah University, Ninevah, Iraq","sequence":"first","affiliation":[]},{"given":"Dia M.","family":"Ali","sequence":"first","affiliation":[]},{"given":"Zhraa Zuheir","family":"Yahya","sequence":"additional","affiliation":[]}],"member":"4977","published-online":{"date-parts":[[2022]]},"container-title":["Journal of Communications"],"original-title":[],"link":[{"URL":"http:\/\/www.jocm.us\/uploadfile\/2022\/0222\/20220222114805325.pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2022,5,13]],"date-time":"2022-05-13T06:41:09Z","timestamp":1652424069000},"score":1,"resource":{"primary":{"URL":"http:\/\/www.jocm.us\/show-266-1743-1.html"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2022]]},"references-count":0,"URL":"https:\/\/doi.org\/10.12720\/jcm.17.3.203-209","relation":{},"ISSN":["2374-4367"],"issn-type":[{"type":"print","value":"2374-4367"}],"subject":[],"published":{"date-parts":[[2022]]}}}