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Signal generation tools take on Wi-SUN and LTE/LTE-Advanced

Posted: 13 Aug 2014  Print Version  Bookmark and Share

Keywords:Signal generation  Signal Studio  N7610B  LTE-A 

Keysight Technologies has added two solutions to its Signal Studio software suite of signal creation tools. The first is signal generation software for the IEEE 802.15.4g-based Wi-SUN standard. The second is support for LTE/LTE-Advanced uplink (UL) 2x2 MIMO with real-time Hybrid Automatic Repeat Request (HARQ).

These latest capabilities further ease the signal generation requirements for R&D and manufacturing engineers developing or testing the conformance of devices to the Wi-SUN and LTE/LTE-A standards.

N7610B Signal Studio software generates Wi-SUN signals and supports the MR-FSK and MR-OFDM Wi-SUN modes. A fully coded advanced capability allows the software to easily make receiver conformance tests using Keysight signal generators (e.g., MXG/EXG, PSG/ESG, or PXIe). For a more complete R&D and manufacturing solution, the N7610B can be used with the company's signal analysis tools. Such functionality and flexibility make the N7610B well suited to support the needs of the emerging market for smart utility networks (e.g., smart grid) in Japan and those companies in the United States working on Wi-SUN-based solutions and products.

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Based on the open global IEEE 802.15.4g-2012 standard, Wi-SUN is intended to advance and enable interoperable and reliable, cost-effective, low-power, wireless utility products for wireless smart utility networks and related applications. The 802.15.4g PHY carries multiple data rates in frequency bands from 450MHz to 2.4GHz and operates in three modes:

1. multi-rate multi-regional frequency shift keying (MR-FSK);

2. multi-rate orthogonal frequency division multiplexing (MR-OFDM); and

3. multi-rate multi-regional offset quadrature phase shift keying (MR-OQPSK).

LTE-A is a leading fourth-generation wireless communications technology defined in release 10 and all follow-on releases of the 3GPP LTE standard. In the LTE eNB receiver conformance test section eight of release 10, a MIMO configuration with real-time HARQ capability on two antenna ports is required to test the physical uplink shared channel in transmissions with multi-path fading propagation conditions.

Thanks to its support for uplink 2x2 MIMO with HARQ, the N7624B/25B Signal Studio for LTE/LTE-Advanced is well-equipped to meet this requirement. With this capability, the N7624B/25B becomes the industry's first LTE UL 2x2 MIMO with real-time HARQ signal generation solution, and Keysight becomes the sole provider of the industry's only complete LTE eNB receiver conformance test solution.

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Keysight's X-Series signal generator with real-time base band generator provides the same 2x2 MIMO signal generation capability and real-time response to the eNB HARQ signal as the PXB. This is accomplished by using two X-Series signal generators and an external fader.

N7624B/25B is ideal for base station R&D engineers working on LTE eNB receiver conformance testing to the 3GPP TS 36.141 standard. The software runs on either Keysight's PXB or X-Series signal generator. With the PXB, the 2x2 MIMO signal is configured directly on the PXB. An internal fader adds the propagation condition. The closed-loop feedback HARQ signal is generated by the eNB and sent to the PXB, where its base band generator responds in real-time. Two RF signal generators then up-convert the signal for the PXB.

- Jean-Pierre Joosting
  EE Times Europe





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