High accuracy pipelined ADC design for wireless LANs

Hekimyan, Arsen; Bulakh, Dmitry; Sahakyan, Arthur

doi:10.1109/itecha.2015.7317415

Cited by 4 publications

(1 citation statement)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…1(a) and 1(b), respectively, they are still difficult to design and not cost-effective for users in a high-speed spread-OFDM/OFDM system. More recently, to relax the requirements of ADCs, we proposed delay-division-multiplexing (DDM) scheme to enable the formulation of OFDM featuring a sub-Nyquist sampling rate ADC [8][9][10], but DFT is still needed for OFDM demodulation. In order to satisfy the future multiuser down-link data traffic, this paper presents a preprocessing method for spread-OFDM, which is capable of eliminating aliasing from receiving high-speed aggregated data using single sub-Nyquist ADC, as shown in Fig.…”

mentioning

confidence: 99%

DFT/IDFT-free receiving scheme for spread-OFDM signals employing low-sampling-rate ADCs

Lin

Wei

et al. 2017

Opt. Express

View full text Add to dashboard Cite

This paper presents a DFT/IDFT-free receiving scheme for spread-OFDM signals. Leveraging sub-Nyquist sampling and proper sampling delay, the proposed scheme enables each user to receive the requested data without the need for DFT and IDFT; thus, the complexity at receiver can be greatly reduced. Nonetheless, DC component is altered in an AC coupling system, such that severe waveform distortion is caused when the process of DFT/IDFT is omitted. Thus, a DC-zeroing algorithm is proposed to guarantee constant DC after sub-Nyquist sampling, thereby eliminating such distortion. To experimentally verify the concept of proposed scheme, a 27.15-Gbit/s optical spread-OFDM signal was transmitted over fiber and received by the DFT/IDFT-free scheme with sub-Nyquist sampling. More users will reduce the required sampling rate at receiver; for the case of 16 users, the required sampling rate for the 27.15-Gbit/s signal is as low as 1 GSample/s. The experimental results show that error-free transmission was achievable, and the penalty due to lowering sampling rate (i.e., increasing the number of users) is insignificant.

show abstract

mentioning

confidence: 99%