Apparatus and method of error vector measurement for digital...

Details Apparatus and method of error vector measurement for digital... Apparatus and method of error vector measurement for digital...

2008-01-08

2011-10-11

Wang, Ted (Department: 2611)

Pulse or digital communications

Systems using alternating or pulsating current

Plural channels for transmission of a single pulse train

C375S299000, C375S347000, C370S334000, C455S101000

Reexamination Certificate

active

08036298

ABSTRACT:
The present invention discloses an effective apparatus and method to measure the received signal quality for digital communication systems by measuring error vector measurement (EVM) with embedded EVM measurement block in receivers. The distinction of the present invention is that the EVMSIGand the EVMDATAare measured in the receiver for the SIGNAL fields and DATA fields, respectively. EVMSIGis a good indicator for one spatial stream and EVMDATAis a good indicator for current multiple streams. The receiver determines the optimum number of spatial data streams for feedback to the transmitter based on the combinations of EVMSIGand EVMDATAwith or without other algorithms such as analysis on periodically requested sounding packet. The receiver also determines the optimum modulation and coding schemes for feedback based on the EVM measurements.

REFERENCES:
patent: 7702048 (2010-04-01), Guess et al.
patent: 2008/0207143 (2008-08-01), Skarby et al.
802.11 Working Group of the 802 Committee, “Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) specifications: Amendment: Enhancements for Higher Throughput,” IEEE P802.11n/D2.00, Feb. 2007.
Stephens, “IEEE P802.11 Wireless LANs,” IEEE 802.11-03/814r31, pp. 1-18, Jul. 2004.

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