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학술대회 A Research on Fast OFDM Modulation for 3GPP LTE Transmitter
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저자
김준우, 문장원, 문영진, 노고산, 박윤옥
발행일
201404
출처
TENSYMP 2014 : IEEE Region 10 Symposium, pp.514-517
DOI
https://dx.doi.org/10.1109/tenconspring.2014.6863087
협약과제
13VI2200, 차세대 기지국 환경(기능분산형)에서 다중모드(Multi-RAT) 다층셀(Multi-tier) 지원 통합 액세스 시스템을 위한 기저대역 원천기술개발, 권동승
초록
In this paper, we propose a latency reduction scheme for an Orthogonal Frequency Division Multiplexing (OFDM) modulator and apply it to a 3GPP LTE transmitter. In the OFDM modulator, latency is composed of the latencies of inverse fast Fourier transform (IFFT), re-ordering and cyclic prefix (CP) addition. The proposed scheme reduces this latency by adding a phase pre-rotator to the IFFT input part and implementing IFFT with decimation in time (DIT) structure. Since this makes the output of IFFT be in-order and contain the cyclic prefix, the OFDM modulation latency is reduced by half compared to the conventional design. Implemented in VHDL, the operation of the proposed OFDM modulator is successfully verified for the three different types of cyclic prefixes in LTE.
KSP 제안 키워드
3GPP LTE, Cyclic prefix(CP), Decimation in Time, OFDM Modulation, Orthogonal frequency division Multiplexing(OFDM), conventional design, inverse fast Fourier transform, latency reduction, re-ordering