This white paper compares and contrasts the two major implementations of beamforming found in the market today:
- Switched array beamforming
- Digital signal processing (DSP)-based beamforming
This paper suggests that both methods do offer some performance gain but that DSP-based beamforming (such as used in ClientLink 2.0) is superior (especially when supporting a network with many clients) and therefore preferred for the following reasons:
- DSP-based techniques are used in 11n chipsets to improve uplink performance. These same DSP techniques can also be used to improve downlink performance. Switched arrays only improve downlink.
- DSP-based beamforming using multiple transmitters for downlink performance improvement is aided by using information acquired from multiple receivers during uplink performance improvement. A switched array cannot easily exploit information acquired in the uplink.
- DSP-based techniques can respond more rapidly to fluctuating RF conditions and therefore can support more clients.
- DSP-based techniques are better suited to orthogonal frequency-division multiplexing (OFDM)/(MIMO) multiple-input and multiple-output because the transmission of each subcarrier and each RF chain can be fine tuned for frequency selective fading (as typical in the wireless channel). Switched arrays do not have the ability to optimize per OFDM subcarrier or RF chain.
- DSP-based techniques are measurably better and validate theoretical/simulated analyses.
Trending Discussions
- If you would like to see the other articles in the blog post of the "Top Ten VoIP Articles of All Ti... Steven Taylor, Webtorials on "Is VoIP Secure? YOU Make the Call":
- Great job I followed since the begining thanks... Eduardo Pérez Telesystems SpA on "The 2018 Guide to WAN Architecture and Design - Executive Summary":
- Thanks to Marjorie at RingCentral for reminding me that this paper existed. Looking forward to your... Steven Taylor, Webtorials on "Is VoIP Secure? YOU Make the Call":
- looking at WAN re-engineering projects... Sunny on "The 2018 Guide to WAN Architecture and Design - Part 2: Key Considerations when Choosing new WAN and Branch Office Solutions":
- Hi Richard. We appreciate your feedback. Jim Metzler always provides excellent analysis on the ever-... Nancy Leonard, Webtorials on "The 2017 State-of-the-WAN Report":
- Interesting reading... Richard Fausey, Plow, LLC on "The 2017 State-of-the-WAN Report":
- I needed this document. Thank you.... AO NII Mashtab on "The 2017 Guide to WAN Architecture and Design - Executive Summary":
- I look forward to reviewing more info on this topic.
... trevor evans - fox group on "2017 Workplace Productivity and Communications Technology Report":
- I would like access to your "2017 Workplace Productivity and Communications Technology Report"
Than... Paul Zielie, Harman Professional Solutions on "2017 Workplace Productivity and Communications Technology Report":
- I'm Telecommunications Engineer at PETROBRAS S.A. and i have overall interest about WAN. ... JOSE CEREZO, PETROBRAS S.A. on "The 2017 Guide to WAN Architecture and Design - Part 1: State of the WAN":
See more discussions...