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Single frequency network (SFN) has been widely used in digital terrestrial television broadcasting (DTTB) systems. In this paper, we propose a SFN structure for DTMB systems using satellite links as the main program distribution networks. The proposed structure is more suitable for constructing national wide or large area DTTB SFN under complicated environments. The network structure and key technologies...
This paper presents the modeling and design consideration of a time-based ADC architecture that uses VCOs in a high-linearity, 2nd-order noise-shaping delta-sigma ADC. Instead of driving the VCO by a continuous analog signal, which suffers from the nonlinearity problem of the VCO gain, the VCO is driven in an intrinsically linear way, by a time-domain PWM signal. The two discrete levels of the PWM...
A 0.4mm2 low-power fully-reconfigurable continuous-time (CT) feedforward ΔΣ ADC for 4G radios is implemented in 90nm CMOS. By reconfiguring the topology architecture, quantizer bits, biasing current and component parameters, optimal power consumption can be achieved for every mode. The modulator achieves a DR of 85/78/76/72/58dB for GSM/BT/UMTS/DVB-H/WLAN with 2.8/2.6/3.6/4.9/8.5mW from 1V supply...
In this paper, we propose a general expression of the peak-to-average power ratio (PAPR) distribution in orthogonal frequency division multiplexing (OFDM) systems with unequal power allocation strategy, which is based on the extreme value theory for Chi-squared-2 process. The proposed general distribution of the PAPR depends on the number of the subcarriers, distribution of the power allocation and...
The paper proves the unusability of smart antenna (SA) which is defined in the TD-SCDMA standard, and so the TD-SCDMA standard should be improved. A reform schema will be given in this paper, which uses CDMA/TDMA respectively in the uplink/downlink channel. In this schema, the SA can still be used in downlink channel. It will give a new life to TD-SCDMA standard. 8PSK or 16QAM can be used in the downlink...
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