SS-CDMA Flexible Wireless Network: Packet SS-CDMA Modem Using SAW Matched Filter for Downlink

Hiroyuki NAKASE  Yosuke IIZUKA  Suguru KAMEDA  Shuichi TOMABECHI  Atsushi KOMURO  Kazuo TSUBOUCHI  

IEICE TRANSACTIONS on Communications   Vol.E84-B   No.4   pp.747-751
Publication Date: 2001/04/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Mobile Multimedia Communications)
SS-CDMA flexible wireless network,  packet SS-CDMA,  2.4 GHz front-end SAW matched filter,  

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We have proposed the packet SS-CDMA scheme for downlink of SS-CDMA flexible wireless cellular network. Transmission packet is framed with synchronization block with 11 chip Barker code and information block with orthogonal spreading code. The chip synchronization is carried out using short code surface acoustic wave (SAW) matched filter. The code de-spreading is carried out using in-line de-spreader. Multi-channel downlink of 63 channels can be designed using orthogonal m-sequence. Simulation results show more than 15 channels without degradation from theoretical value can be used under multi-path environment. The packet SS-CDMA modem has been implemented using a 2.4 GHz front-end SAW matched filter. Degradation of Eb/N0 of less than 0.5 dB is experimentally achieved with four-channel multiplex.