Browsing by Author "Wu, Chih-Feng"

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A 802.15.3c/802.11ad Dual Mode Phase Noise Cancellation for 60 GHz Communication Systems
(2015)
Huang, Liang-Yu
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Wu, Chia-Yi
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Liu, Chun-Yi
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Liu, Wei-Chang
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Wu, Chih-Feng
In this paper, a phase noise cancellation (PNC) architecture is presented for 60 GHz communication systems. The BER performance is severely degraded by the non-ideal carrier frequency in 60 GHz bandwidth, which causes both common phase error (CPE) and residual carrier frequency offset (RCFO). The proposed simplified two-stage CPE algorithm solves the RCFO and common phase nose in the frequency domain and eliminates the constellation rotation on each sub-channel. Two-stage architecture together with deep pipelining technique achieves a high throughput rate. This PNC architecture has been implemented in a SC/OFDM Dual-Mode baseband receiver satisfying the requirements of the 802.15.3c/802.11ad standard with a 40 nm process. The proposed PNC is able to support 64QAM/16QAM for OFDM/SC mode, and can achieve up to 19.2 Giga-hit per second (Gbps) throughput rate at 400 MHz operating frequency with power consumption of 33 mW and area of 0.142 mm(2).
Dual-Mode All-Digital Baseband Receiver With a Feed-Forward and Shared-Memory Architecture for Dual-Standard Over 60 GHz NLOS Channel
(2017-03-01)
Liu, Chun-Yi
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Sie, Meng-Siou
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Leong, Edmund Wen Jen
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Yao, Yu-Cheng
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Jen, Chih-Wei
In this paper, an 8X-parallelism all-digital baseband receiver is proposed to support SC and OFDM modes for both IEEE 802.15.3c and IEEE 802.11ad standards. The all-digital baseband receiver contains a 4-in-1 synchronization (SYNC), a 512-point radix-23 IFFT/FFT, a phase noise cancellation (PNC), a shared memory (MEM) bank and a frequency-domain equalizer (FDE) with an optimized golay-correlator window-based noise cancellation (OGC-WNC) channel estimation (CE) for non-line-of-sight (NLOS) and line-of-sight (LOS) channels. The hardware sharing is 99% between SC and OFDM modes and the shared memory reduces memory usage by 51%. The measurement results show that the fabricated chip can provide PHY data rate of 9.24 Gb/s with power consumption of 497 mW to meet the requirement of OFDM mode for IEEE 802.15.3c and 802.11ad standards. Besides, the PHY data rate of the fabricated chip reaches 14 Gb/s with power consumption of 698 mW for OFDM mode that is beyond the standard requirement to offer higher PHY data rate over 60 GHz transmission environment.
Golay-Correlator Window-Based Noise Cancellation Equalization Technique for 60-GHz Wireless OFDM/SC Receiver
(2016-11)
Wu, Chih-Feng
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Liu, Wei-Chang
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Tsui, Chia-Chun
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Liu, Chun-Yi
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Sie, Meng-Siou
In this paper, a Golay-correlator window-based noise cancellation (GC-WNC) technique with frequency-domain equalizer (FDE) is proposed. The GC-WNC is a cooperative scheme in the time and frequency domains to combat the multipath effect in nonline-of-sight (NLOS) and LOS channels for orthogonal frequency-division multiplexing (OFDM) and single-carrier mode baseband inner receiver over 60-GHz environment for IEEE 802.15.3c and 802.11ad. According to mean-square error criterion, WNC approach is to minimize the estimation error between the ideal and the estimated channel frequency response (CFR) on each subchannel. The CFR is precisely obtained as coefficients of FDE to compensate multipath effect even in NLOS channel. The GC-WNC FDE with 8X-parallelism is designed as a part of digital baseband inner receiver with 40-nm CMOS general-purpose process. Because of area restriction of tape-out chip, only the OFDM mode is fabricated in the chip. The GC-WNC FDE has an equivalent gate count of 230k occupying 11.3% of the baseband inner receiver. Based on the chip measurement results, the baseband inner receiver with GC-WNC FDE provides 24-Gb/s throughput with 500-MHz operating clock and 0.94 V supply voltage. The power consumption of GC-WNC FDE is 69.79 mW. The baseband inner receiver with GC-WNC FDE can deliver a multigigabit per second throughput with the power dissipation of 2.91/2.26 mW/Gb/s at 500-/330-MHz operating clock for the OFDM mode.