This paper deals with the effect of the Single-Input Multiple-Output spatial diversity on the OFDM mobile radio signal propagating in an urban channel. From measurements performed in Rio de Janeiro city, Brazil, by using two receiving antennas at diversity, the calculated capacity presented an improvement when compared to the individual one.
Index Terms
delay spread; OFDM; SIMO; spatial diversity; urban channel
| Device | Specifications | |
|---|---|---|
| Vector Signal Generator MG3700A | 250 kHz to 6 GHz | |
| Tx | Power Amplifier Milmega, model AS0204-7B 2-4 GHz 7W | G = 47 dB |
| Antenna Pctel SP232715XP-90 | G = 16 dBi | |
| Broadband Low Noise Amplifier ABL0800-12-3315 | G = 33 dB | |
| Vector Signal Analyzer MS 2692A | 50 Hz to 26,5 GHz | |
| Rx | Antenna Superbat 700 – 2600 MHz 4G LTE omnidirecional | G = 5 dBi |
| GPS Garmin GPSmap62 | – |
| Parameter | Value | Unit |
|---|---|---|
| Bandwidth | 40 | MHz |
| Size of the FFT | 2048 | Samples |
| Sampling Factor | 2 | – |
| Sampling Rate | 100 × 106 | Samples/second |
| Number of Carriers | 1600 | Carriers |
| Cyclic Prefix | 1/16 | Samples |
| Antenna | Link | RMS Delay Spread (μs) |
|---|---|---|
| 1 | L1 | 0.172 – 4.438 |
| 2 | L2 | 0.223 – 4.253 |
| Capacity/band | bps/Hz | Transmission rate (Mbps) |
|---|---|---|
| SISO - Branch 1 | 0.003 to 1.3 | 0.12 to 52 |
| SISO - Branch 2 | 0.007 to 1.7 | 0.28 to 68 |
| SIMO - Branches 1 and 2 | 0.100 to 1.86 | 4.00 to 74.4 |
(Source: Google earth).
