ADC’s DAS solutions supporting Verizon’s national 4G LTE wireless service rollout. ADC announced that its distributed antenna systems (DAS) solutions are supporting national LTE network rollouts by Verizon Wireless. ADC reports that more than 100 of its InterReach and FlexWave systems have been deployed in major stadiums, urban core areas, and other locations such as the New Meadowlands Stadium and Denver International Airport, where Verizon is rolling out LTE services.
ADC is the carrier’s preferred provider of 700 MHz single-input single-output (SISO) and multiple-input multiple-output (MIMO) solutions; the company says its systems are forming a critical part of LTE service rollouts across the United States.
ADC notes that, with a requirement to deliver multi-megabit data services to every user, LTE services demand a new micro-cellular network approach that brings the signal much closer to the subscriber. ADC says its DAS solutions are an efficient way to deliver LTE services because they extend LTE signals out from centralized base stations using highly reliable, low-maintenance antennas.
According to the company, rather than placing femtocells or picocells in thousands of locations, wireless service providers can reduce backhaul and operational expenses by extending signals out from centralized base stations. Also, rather than having to run a complete set of cabling for each service to be provided as with other DAS systems, ADC attests that its DAS solutions support multiple protocols with a single run of low-cost fiber optic and CATV cabling.
The ADC DAS architecture is ideally suited for LTE rollouts because it uses easily deployed antennas to extend services inside buildings and in urban cores,” said John Spindler, vice president of product management for ADC’s Network Solutions Business Unit. “Our systems have been certified for 4G networks by multiple wireless service providers, and they are being deployed at a rapid pace as these operators light up LTE services in new markets.
Filtering ADC for the LTE communication standard, where a second-order Delta–Sigma modulator (DSM) is incorporated into the third-order Chebychev channel-select filter (CSF) of the radio receiver. The CSF introduces an additional third-order suppression of both thermal and quantization DSM noise, while the CSF transfer function is maintained. A design method for the filtering ADC accounting for unavoidable DSM-DAC delays is developed and experimentally demonstrated. The 65 nm CMOS prototype is clocked at 576/288 MHz with an 18.5/9.0 MHz LTE bandwidth, has an in-band gain of 26 dB, an SNDR of 56.4/58.1 dB, an input-referred noise of 5 nV/ Hz√, and an out-of-band (half-duplex) IIP3 of 20/12 dBV rms , with a power consumption of 7.9/5.4 mW and an overall state-of-the art performance.