Wireless Solutions
WD-MIMO⁺ 5G Frequency-Shifting Indoor Coverage System
The WD-MIMO⁺ 5G frequency-shifting indoor coverage system delivers 5G MIMO over the single RF cable used by the original DAS installation. One of the two 5G-NR channels is frequency-shifted (2515–2675 MHz, 160 MHz bandwidth) and combined with the other signals before being fed into a single cable to the remote unit, where the shifted frequency is restored to achieve 2T2R MIMO coverage. 2T2R is supported on a single cable and 4T4R on dual cables. The system is seamlessly compatible with the original 2G/3G/4G network, supports network management, dynamic power balance, and greatly reduces construction and operating costs compared with digital indoor coverage systems.
Features & Characteristics
- ▪Frequency-shift technology delivers 2T2R MIMO transmission over the existing single-cable DAS (4T4R with dual cables).
- ▪Frequency-shifting band 2515–2675 MHz with 160 MHz bandwidth.
- ▪Automatic power-balance algorithm monitors the two NR channels; power difference held within 1 dB — transmission rate more than 1.8× a traditional single-cable system (peak > 800 Mbps, average > 500 Mbps).
- ▪Network management: real-time monitoring of every antenna — output-power detection, abnormal alarms, offline detection.
- ▪Dynamic power compensation on each remote unit — automatically restores 5G high-frequency signal power over long cable runs.
- ▪DC feeding: near-end unit feeds 48 V DC over the RF cable; near-end 15 W max, remote unit 2–4 W (< 1 W in power-saving mode).
- ▪One near-end unit supports up to 64 remote units (antennas).
- ▪Smart power-saving mode automatically shuts down the 5G frequency-shifting channel during low-traffic periods.
- ▪Short-circuit protection: near-end unit automatically cuts remote power on cable/device short circuit and alarms locally.
- ▪Verified by the China Telecommunication Technology Labs — near-end 14.21 W (≤ 15 W spec), remote 3.32 W @ 20 dBm downlink (≤ 4 W spec).
- ▪Compatible with the original DAS: TDD-LTE, FDD-LTE, TD-SCDMA, WCDMA, CDMA2000 and GSM signals stay transparent; original 2G/3G/4G coverage strength maintained.
- ▪Supports both 5G NSA and 5G SA networking.
Applications
- ▪Rapid 5G-MIMO upgrade of existing passive DAS indoor coverage systems in office buildings, hotels, restaurants, entertainment venues, teaching/administrative buildings and industrial parks.
- ▪Poor-coverage indoor sites where the installed DAS cable cannot meet 5G signal-strength requirements.
- ▪High-traffic sites where single-cable DAS measured speed is only 200–400 Mbps and WD-MIMO⁺ can lift it to 360–800 Mbps.
- ▪Buildings with many partitions and small rooms where digital indoor coverage would be too expensive to install.
- ▪On-demand mixed deployment — MIMO remote units in hotspot zones, original single-polarized antennas retained elsewhere on the same RRU.
Technical specifications
- System configuration
- Near-end unit + DC-feeding coupler + power splitter + WD-MIMO remote units (antenna integrated)
- 5G MIMO mode
- 2T2R over single cable / 4T4R over dual cables
- Frequency-shifting band
- 2515–2675 MHz
- Frequency-shifting bandwidth
- 160 MHz
- Power balance
- Automatic, power difference ≤ 1 dB between the two NR channels
- Downlink throughput (with WD-MIMO⁺)
- Peak > 800 Mbps, average > 500 Mbps (> 1.8× single-cable DAS)
- Near-end unit power consumption
- ≤ 15 W (tested 14.21 W)
- Remote unit power consumption
- ≤ 4 W @ 20 dBm downlink (tested 3.32 W); < 1 W in power-saving mode
- DC feed voltage
- 48 V DC over the RF cable
- Remote units per near-end unit
- Up to 64
- System full-load power (30 antennas + RRU)
- < 900 W (vs > 2200 W for a comparable digital indoor coverage system)
- Fault handling
- Short-circuit auto-protection with near-end alarm; original 2G/3G/4G signals kept transparent on system fault
- Network management
- Output-power detection, abnormal alarm, offline detection
- Networking modes supported
- 5G NSA and 5G SA
- Compatible legacy systems
- GSM / DCS / TD-SCDMA / WCDMA / CDMA2000 / TDD-LTE / FDD-LTE
- Certification
- Tested by China Telecommunication Technology Labs — Report No. B19X42090 (合格 / Qualified)
Transformation steps (upgrade an existing single-cable DAS to 5G MIMO)
| Step | Action |
|---|---|
| Step 1 | Add a WD-MIMO near-end unit after the RRU |
| Step 2 | Replace the existing coupler with a DC-feeding coupler |
| Step 3 | Replace the original single-polarized antenna with the WD-MIMO remote unit (antenna integrated) |
WD-MIMO⁺ vs digital indoor coverage system (source: catalogue comparison table)
| Item | WD-MIMO⁺ | Digital indoor coverage system |
|---|---|---|
| Construction method | Original single cable upgraded to MIMO via frequency-shifting | MIMO via network cable or optical fibre |
| Transmission cable | The original single cable | Original RF cable replaced with network cable or fibre |
| Original DAS | Old DAS retained and combined with 5G frequency-shifting system; one near-end unit supports 64 remote units | Original RRU removed; rHUB added per floor, one rHUB supports 8 pRRUs (replacing passive antennas) |
| Network management | Yes | Yes |
| Construction difficulty | Easy — simple coordination | Difficult |
| Operation / maintenance power | Remote 1–4 W; near-end 15 W; 30 antennas + RRU < 900 W | 30 pRRUs > 2200 W |
China Telecommunication Technology Labs test results (extract — Report B19X42090)
| Item | Requirement | Measured | Result |
|---|---|---|---|
| System safety | Keep original NR/TDD-LTE/FDD-LTE/TD-SCDMA/GSM/DCS signals when the system fails or loses power; short-circuit auto-protection with near-end alarm | Compliant | Qualified |
| Near-end unit power (no remote) | ≤ 15 W | 14.21 W | Qualified |
| Remote unit power @ 20 dBm downlink | ≤ 4 W | 3.32 W | Qualified |
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