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Content Provider | IEEE Xplore Digital Library |
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Author | Maehata, T. Kameda, S. Suematsu, N. |
Copyright Year | 2012 |
Description | Author affiliation: Research Institute of Electrical Communication, Tohoku University, 2-1-1 Karahira, Aoba-ku, Sendai 980-8577, Japan (Kameda, S.; Suematsu, N.) || Information & Communications Laboratories, Sumitomo Electric Industries, 1-1-3 Shimaya Konohana-ku, Osaka 554-0024, Japan (Maehata, T.) |
Abstract | We have developed a prototype of 1-bit direct radio frequency converter (DRFC) which is a kind of RF transmitter using bandpass delta-sigma modulation (BP-DSM). This prototype has functionalities to synchronously transmit two signals up to 6 Gb/s and to reduce intersymbol interference of eye pattern. In a trial, we transmitted a pair of 1 carrier with 5 MHz bandwidth of LTE at 300 MHz using BP-DSM to aim the MIMO, with an ACLR of 47 dB. This paper investigated the relationship between the ACLR of BP-DSM and analog waveform of 1-bit pulse train using the prototype. To clarify waveform influence, we introduced waveform decomposition into symmetric and asymmetric components to the time axis. We calculated numerical simulations using several types of waveforms varying the transition time. We confirmed that the asymmetric component causes spectrum leakage at adjacent channels. We finally concluded that the optimal waveform for BP-DSM is symmetrical to the time axis and that the ACLR in the prototype will improve to 60 dB by simulation. |
Starting Page | 1051 |
Ending Page | 1054 |
File Size | 401519 |
Page Count | 4 |
File Format | |
ISBN | 9781467322157 |
e-ISBN | 9782874870279 |
e-ISBN | 9782874870262 |
Language | English |
Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
Publisher Date | 2012-10-29 |
Publisher Place | Netherlands |
Access Restriction | Subscribed |
Rights Holder | EUROPEAN MICROWAVE ASSOC |
Subject Keyword | Prototypes Degradation Band pass filters Intersymbol interference Numerical simulation Equations Microwave theory and techniques noise-shaping Delta-sigma modulator D/A converter behavioral modeling LTE |
Content Type | Text |
Resource Type | Article |
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