Sau-Gee Chen

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This paper presents a high-throughput FFT processor for IEEE 802.15.3c (WPANs) standard. To meet the 2.59 Gigasample/s throughput requirements, radix-16 FFT algorithm is adopted and reformulated to an efficient form so that the required number of butterfly stages is reduced and the proposed radix-16 FFT butterfly processing element (PE) can be optimally(More)
In this paper, based on the property of channel frequency response and the concept of interpolation in transform domain, we propose two discrete cosine transform (DCT)-based pilot-symbol-aided channel estimators, which can mitigate the aliasing error and high-frequency distortion of the direct discrete Fourier transform (DFT)-based channel estimators when(More)
In this paper, we propose an efficient variable-length FFT processor architecture suitable for multi-mode and multi-standard OFDM communication systems. The FFT processor is based on radix-2/sup 2/ DIF FFT algorithm and also supports non-power-of-4 FFT computation. The design contains an efficient processing element (PE), which can execute radix-2/sup 2/(More)
This paper presents a bit reversal circuit for continuous-flow parallel pipelined FFT processors. In addition to two flexible commutators, the circuit consists of two memory groups, where each group has P memory banks. For the consideration of achieving both low delay time and area complexity, a novel write/read scheduling mechanism is devised, so that FFT(More)
This paper considers a MIMO multi-hop network and analyzes the relationship between its energy consumption and bandwidth efficiency. Its minimum energy consumption is formulated as an optimization problem. By taking both transmit antennas (TAs) and receive antennas (RAs) into consideration, the energy-bandwidth efficiency tradeoff in the networks is(More)
This paper presents a high-throughput FFT processor for IEEE 802.15.3c (WPANs) standard. To meet the throughput requirement of 2.59 Giga-samples/s, radix-16 FFT algorithm is adopted and reformulated to an efficient form so that the required number of butterfly stages is reduced. Specifically, the radix-16 butterfly processing element consists of two(More)
Although wireless OFDM systems are robust against frequency-selective fading and ISI effects, their relatively long symbol lengths are vulnerable to time-selective fading and ICI (intercarrier interference) effects in mobile environments due to Doppler spread. However, commonly, a time-selective fading channel is linearly time-varying from symbol to symbol(More)
This work presents a blind fine synchronization scheme, which estimates and compensates residual carrier-frequency offset (RCFO) and symbol timing offset (STO) , for single-carrier frequency-domain equalization (SC-FDE) systems. Existing fine synchronization schemes for SC-FDE systems rely on time-domain unique words (UW) sequences as reference signals to(More)