Higher 5G frequencies make outdoor-to-indoor coverage more difficult, while existing passive distributed antenna systems often lack 2 × 2 MIMO support. This solution upgrades a single-channel passive DAS using frequency conversion. At the near-end unit, one 5G signal passes through unchanged while the other is shifted to 500-660 MHz, combined with 2G/3G/4G and the other signal, and transported through the passive DAS. The remote unit restores the shifted signal to 2.6 GHz, enabling indoor 5G 2 × 2 MIMO coverage.
System Architecture
Near-end / Access Unit
Combiner Unit
Remote Coverage Unit
RF Specifications
2.6 GHz Specifications
Parameter | Requirement | |||||||||||||
Active Branch Frequency Range | 2515～2675MHz | |||||||||||||
Active Branch Maximum Output Power | Downlink: +20 dBm ±1 dB; Uplink: -40 dBm ±1 dB | |||||||||||||
Active Branch Gain Adjustment Range | Downlink: 0-20 dB in 1 dB steps; Uplink: 0-20 dB in 1 dB steps | |||||||||||||
Active Branch In-band Ripple | Downlink <3 dB; Uplink <3 dB | |||||||||||||
Automatic MIMO Power Balancing | Monitors and balances the downlink transmit power of two 5G NR signals. When the pass-through NR power changes, the frequency-converted branch adjusts automatically to keep the power difference within 3 dB. | Passive Input Power | -13dBm | -18dBm | -23dBm | |||||||||
Passive Output Power | Measured Value | Measured Value | Measured Value | |||||||||||
Active Input Power | 7dBm | 7dBm | 7dBm | |||||||||||
Active Output Power | Measured Value | Measured Value | Measured Value | |||||||||||
Power Difference | ≤3dB | ≤3dB | ≤3dB | |||||||||||
Active Branch System Uplink Noise Figure | ≤5 dB with near-end and remote units directly connected | |||||||||||||
Active Branch System Uplink Noise Floor Rise | ≤1 dB with link attenuation above 20 dB | |||||||||||||
Active Branch Delay | ≤100ns | |||||||||||||
Active Branch ACLR | ≤-45dBc @20dBm | |||||||||||||
Active Branch EVM | EVM≤3.5% @256QAM EVM≤5% @64QAM | |||||||||||||
Active Branch Frequency Error | ≤±0.01ppm | |||||||||||||
Active/Passive Branch Spurious Emissions | 9KHz～150KHz | ≤-36dBm@1KHz | ||||||||||||
150KHz～30MHz | ≤-36dBm@10KHz | |||||||||||||
30MHz～1GHz | ≤-36dBm@100KHz | |||||||||||||
1GHz～12.75GHz | ≤-30dBm@1MHz | |||||||||||||
Active Branch Spectrum Emission Mask | 0.05-5.05 MHz @ 100 kHz or 0 MHz ≤ Δf < 5 MHz | ≤-7-(7/5)（⊿f/MHz-0.05)dBm | ||||||||||||
5.05-10.05 MHz @ 100 kHz or 5 MHz ≤ Δf < min(10 MHz, Δfmax) | ≤-14dBm | |||||||||||||
10.05-fmax @ 1 MHz or 10 MHz ≤ Δf ≤ Δfmax | ≤-15dBm | |||||||||||||
Active/Passive Branch Spurious Emissions in Special Bands | 880-915MHz/100 kHz ≤-61dBm | |||||||||||||
930 960 MHz/100 kHz ≤-57dBm | ||||||||||||||
1710-1785 MHz/100 kHz ≤-61dBm | ||||||||||||||
1805 1880 MHz/100 kHz ≤-47dBm | ||||||||||||||
1880–1920MHz/1MHz ≤-52dBm | ||||||||||||||
1920-1980 MHz/1MHz ≤-49dBm | ||||||||||||||
2010-2025 MHz/1MHz ≤-52dBm | ||||||||||||||
2300-2400 MHz/1MHz ≤-49dBm | ||||||||||||||
2900–3000 MHz/1MHz ≤-52dBm | ||||||||||||||
Active Branch Uplink Blocking Interference signal type: CW | Interference Frequency Band | Interference Level | Gain Variation | EVM Degradation | ||||||||||
806MHz<f<835MHz | -13dBm | ≤6dB | ≤3% | |||||||||||
851MHz<f<880MHz | -13dBm | ≤6dB | ≤3% | |||||||||||
885MHz<f<915MHz | -13dBm | ≤6dB | ≤3% | |||||||||||
930MHz<f<960MHz | -13dBm | ≤6dB | ≤3% | |||||||||||
1710MHz<f<1785MHz | -13dBm | ≤6dB | ≤3% | |||||||||||
1805MHz<f<1850MHz | -13dBm | ≤6dB | ≤3% | |||||||||||
1850MHz<f<1880MHz | -13dBm | ≤6dB | ≤3% | |||||||||||
1880MHz<f<1920MHz | -13dBm | ≤6dB | ≤3% | |||||||||||
2010MHz<f<2025MHz | -13dBm | ≤6dB | ≤3% | |||||||||||
2110MHz<f<2170MHz | -13dBm | ≤6dB | ≤3% | |||||||||||
2320MHz<f<2370MHz | -13dBm | ≤6dB | ≤3% | |||||||||||
3300MHz<f<3600MHz | -13dBm | ≤6dB | ≤3% | |||||||||||
TDD Synchronization Test | Both downlink and uplink EVM requirements must be met | ≤5% @64QAM | ||||||||||||
Active Branch Port VSWR | Input VSWR | ≤1.8 | ||||||||||||
Output VSWR | ≤1.8 | |||||||||||||
Passive Branch Insertion Loss | 890-960MHz | 1710-1885MHz | 1880-1920MHz | 2010-2025 MHz | 2320-2370MHz | 2515-2675MHz | ||||||||
≤3.0dB | ≤3.0dB | ≤3.0dB | ≤3.0dB | ≤3.0dB | ≤3.0dB | |||||||||
Passive Branch Downlink In-band Ripple | 890-960MHz | 1710-1885MHz | 1880-1920MHz | 2010-2025MHz | 2320-2370MHz | 2515-2675MHz | ||||||||
≤2dB | ≤2dB | ≤2dB | ≤2dB | ≤2dB | ≤2dB | |||||||||
Passive Branch Uplink In-band Ripple | 890-960MHz | 1710-1885MHz | 1880-1920MHz | 2010-2025MHz | 2320-2370MHz | 2515-2675MHz | ||||||||
≤2dB | ≤2dB | ≤2dB | ≤2dB | ≤2dB | ≤2dB | |||||||||
Passive Branch Port VSWR | Input VSWR | ≤1.8 | ||||||||||||
Output VSWR | ≤1.8 | |||||||||||||
Total Power Consumption | Near-end unit: ≤15 W, excluding remote units Remote unit: ≤5 W at 20 dBm downlink output | |||||||||||||
Average Uplink and Downlink Throughput | Uplink and downlink throughput achieves two-stream MIMO performance compared with the original system | |||||||||||||
3.5 GHz Specifications
Parameter | Requirement | ||||||||||
NR Frequency Range | 3400MHz-3600MHz | ||||||||||
Frequency Conversion Range | 500MHz-700MHz | ||||||||||
Maximum Downlink Output Power | +20dBm±1dB | ||||||||||
NR Pass-through Gain Adjustment Range | -10 dB to +20 dB | ||||||||||
★ NR In-band Ripple | ≤3dB@3400MHz-3500MHz ≤3dB@3500MHz-3600MHz | ||||||||||
NR Pass-through Dynamic Power Compensation Test | The remote unit measures NR pass-through output power in real time and dynamically compensates it to 20 dBm ±1 dB. | NR Pass-through Input Power | 0dBm | 10dBm | 30dBm | ||||||
NR Pass-through Output Power | 20dBm±1dB | 20dBm±1dB | 20dBm±1dB | ||||||||
Automatic MIMO Power Balancing Test | Monitors and balances the downlink transmit power of two 5G NR signals. When pass-through power changes, the frequency-converted NR branch adjusts automatically to maintain a power difference within 3 dB. | NR Pass-through Output Power | 20dBm | 15dBm | 10dBm | ||||||
Frequency-converted NR Input Power | 7dBm | 7dBm | 7dBm | ||||||||
Frequency-converted NR Output Power | 20dBm±3dB | 15dBm±3dB | 10dBm±3dB | ||||||||
NR Uplink Noise Figure | ≤5 dB with near-end and remote units directly connected | ||||||||||
Uplink Noise Floor Rise | ≤3 dB with link attenuation above 20 dB | ||||||||||
Delay | ≤100ns | ||||||||||
ACLR | ≤-45dBc @20dBm | ||||||||||
EVM | ≤3.5% @256QAM ≤ 5% @64QAM | ||||||||||
Frequency Error | ≤±0.01ppm | ||||||||||
Spurious Emissions | 9KHz～150KHz | ≤-36dBm@1KHz | |||||||||
150KHz～30MHz | ≤-36dBm@10KHz | ||||||||||
30MHz～1GHz | ≤-36dBm@100KHz | ||||||||||
1GHz～12.75GHz | ≤-30dBm@1MHz | ||||||||||
Spectrum Emission Mask | 0.05-5.05 MHz @ 100 kHz or 0 MHz ≤ Δf < 5 MHz | ≤-7-(7/5)（⊿f/MHz-0.05)dBm | |||||||||
5.05-10.05 MHz @ 100 kHz or 5 MHz ≤ Δf < min(10 MHz, Δfmax) | ≤-14dBm | ||||||||||
10.05-fmax @ 1 MHz or 10 MHz ≤ Δf ≤ Δfmax | ≤-15dBm | ||||||||||
Spurious Emissions in Special Bands | 880MHz–915MHz/100 kHz ≤-61dBm | ||||||||||
930MHz–960MHz/100 kHz ≤-57dBm | |||||||||||
1710MHz–1785MHz/100 kHz ≤-61dBm | |||||||||||
1805MHz–1880MHz/100 kHz ≤-47dBm | |||||||||||
1880MHz–1920MHz/1MHz ≤-52dBm | |||||||||||
1920MHz–1980MHz/1MHz ≤-49dBm | |||||||||||
2010MHz–2025MHz/1MHz ≤-52dBm | |||||||||||
2300MHz–2400MHz/1MHz ≤-49dBm | |||||||||||
2496MHz–2690MHz/1MHz ≤-52dBm | |||||||||||
2900MHz–3000MHz/1MHz ≤-52dBm | |||||||||||
Uplink Blocking Interference signal type: CW | Interference Frequency Band | Interference Level | Gain Variation | EVM Degradation | |||||||
806MHz<f<835MHz | -13dBm | ≤6dB | ≤3% | ||||||||
851MHz<f<880MHz | -13dBm | ≤6dB | ≤3% | ||||||||
885MHz<f<915MHz | -13dBm | ≤6dB | ≤3% | ||||||||
930MHz<f<960MHz | -13dBm | ≤6dB | ≤3% | ||||||||
1710MHz<f<1785MHz | -13dBm | ≤6dB | ≤3% | ||||||||
1805MHz<f<1850MHz | -13dBm | ≤6dB | ≤3% | ||||||||
1850MHz<f<1880MHz | -13dBm | ≤6dB | ≤3% | ||||||||
1880MHz<f<1920MHz | -13dBm | ≤6dB | ≤3% | ||||||||
2010MHz<f<2025MHz | -13dBm | ≤6dB | ≤3% | ||||||||
2110MHz<f<2170MHz | -13dBm | ≤6dB | ≤3% | ||||||||
2320MHz<f<2370MHz | -13dBm | ≤6dB | ≤3% | ||||||||
2515MHz<f<2675MHz | -13dBm | ≤6dB | ≤3% | ||||||||
TDD Synchronization Test | Both downlink and uplink EVM requirements must be met | ≤5% @64QAM | |||||||||
Port VSWR | Input VSWR | ≤1.5 | |||||||||
Output VSWR | ≤1.5 | ||||||||||
Pass-through Insertion Loss | 820MHz-960MHz | 1735MHz-1880MHz | 1920MHz-1980MHz | 2110MHz-2170MHz | |||||||
≤3.0dB | ≤3.0dB | ≤3.0dB | ≤3.0dB | ||||||||
Pass-through Downlink In-band Ripple | 820-960MHz | 1735-1880MHz | 1920-1980MHz | 2110-2170MHz | |||||||
≤2dB | ≤2dB | ≤2dB | ≤2dB | ||||||||
Pass-through Uplink In-band Ripple | 820MHz-960MHz | 1735MHz-1880MHz | 1920MHz-1980MHz | 2110MHz-2170MHz | |||||||
≤2dB | ≤2dB | ≤2dB | ≤2dB | ||||||||
Total Power Consumption | Near-end unit: ≤15 W, excluding remote units Remote unit: ≤6 W at 20 dBm downlink output | ||||||||||
