Development and Evaluation of the SDMA Test Bed for PHS in the Field(<Special Issue>Software Defined Radio Technology and Its Applications)

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Many carriers are introducing multi-media services to satisfy customer demands for these services In order to provide such services, carrier must increase their system capacity It is well known that space division multiple access (SDMA) improves system capacity and is compatible with existing access systems In order to evaluate the performance of SDMA, we developed an SDMA test bed The test bed maintains the personal handy phone systems (PHS) The PHS adopts time division multiple access (TDMA) Aiming to compare the performance of SDMA and TDMA using the same analog hardware, the SDMA test bed employs a software-defined radio (SDR) technique This paper shows the outline and performance of the test bed The results of laboratory tests indicate that the bit error rate (BER) of the test bed operated in the SDMA mode at under 10^<-3> when the carner-to-interference ratio (CIR) was larger than approximately -22 dB Antenna patterns measured in an anechoic chamber show that the SDMA test bed produces correct antenna patterns when there are three desired signals and one interference signal The results of the four field tests confirm that the test bed operated while two-multiplex SDMA mode doubled of the traffic and decreased the interference level as compared with the TDMA mode Furthermore, the test bed operated while threemultiplex SDMA mode improves the traffic about 24 to 27 times The SDMA test bed decreased the impact of the adjusted TDMA base station (BS) Therefore, we confirmed that the SDMA improves system capacity without any degradation
社団法人電子情報通信学会の論文
2003-12-01

Development and Evaluation of the SDMA Test Bed for PHS in the Field(<Special Issue>Software Defined Radio Technology and Its Applications)

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