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Page 1: New Technical Report...44 NTT DoCoMo Technical Journal Vol.2 No.3 45 NTT DoCoMo Technical Journal Vol.2 No.3 New Technical Report In mobile multimedia communications, Co-Channel Interference

44NTT DoCoMo Technical Journal Vol.2 No.3

45NTT DoCoMo Technical Journal Vol.2 No.3

New Technical Report

ノート

In mobile multimedia communications, Co-Channel Interference (CCI) and Inter-Symbol Interference (ISI) are major problems to overcome. Joint space and time equalizers (S/T-Equalizer) are considered most effective in solving these problems. This article describes a beam and null simultaneous steering Space-Time Equalizer (S/T-Equalizer). The S/T-Equalizer performs separated S/T-signal processing in order to reduce computational complexity to a practical level. The S/T-Equalizer was prototyped. A series of field tests were then conducted using the 5 GHz frequency band to evaluate the transmission performance of the S/T-Equalizer. The results show that the S/T-Equalizer can reduce the ISI effects while maintaining reasonable signal strength, thereby improving BER (Bit Error Rate) performance.

Page 2: New Technical Report...44 NTT DoCoMo Technical Journal Vol.2 No.3 45 NTT DoCoMo Technical Journal Vol.2 No.3 New Technical Report In mobile multimedia communications, Co-Channel Interference

46NTT DoCoMo Technical Journal Vol.2 No.3

47NTT DoCoMo Technical Journal Vol.2 No.3

New Technical Report

Page 3: New Technical Report...44 NTT DoCoMo Technical Journal Vol.2 No.3 45 NTT DoCoMo Technical Journal Vol.2 No.3 New Technical Report In mobile multimedia communications, Co-Channel Interference

46NTT DoCoMo Technical Journal Vol.2 No.3

47NTT DoCoMo Technical Journal Vol.2 No.3

New Technical Report

Page 4: New Technical Report...44 NTT DoCoMo Technical Journal Vol.2 No.3 45 NTT DoCoMo Technical Journal Vol.2 No.3 New Technical Report In mobile multimedia communications, Co-Channel Interference

48NTT DoCoMo Technical Journal Vol.2 No.3

49NTT DoCoMo Technical Journal Vol.2 No.3

New Technical Report

Page 5: New Technical Report...44 NTT DoCoMo Technical Journal Vol.2 No.3 45 NTT DoCoMo Technical Journal Vol.2 No.3 New Technical Report In mobile multimedia communications, Co-Channel Interference

48NTT DoCoMo Technical Journal Vol.2 No.3

49NTT DoCoMo Technical Journal Vol.2 No.3

New Technical Report

Page 6: New Technical Report...44 NTT DoCoMo Technical Journal Vol.2 No.3 45 NTT DoCoMo Technical Journal Vol.2 No.3 New Technical Report In mobile multimedia communications, Co-Channel Interference

50NTT DoCoMo Technical Journal Vol.2 No.3

51NTT DoCoMo Technical Journal Vol.2 No.3

New Technical Report

Page 7: New Technical Report...44 NTT DoCoMo Technical Journal Vol.2 No.3 45 NTT DoCoMo Technical Journal Vol.2 No.3 New Technical Report In mobile multimedia communications, Co-Channel Interference

50NTT DoCoMo Technical Journal Vol.2 No.3

51NTT DoCoMo Technical Journal Vol.2 No.3

New Technical Report

Page 8: New Technical Report...44 NTT DoCoMo Technical Journal Vol.2 No.3 45 NTT DoCoMo Technical Journal Vol.2 No.3 New Technical Report In mobile multimedia communications, Co-Channel Interference

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