US 7,519,129 B2
	Precoding of contention words in a fixed wireless access system
John David Porter, Cambridge (United Kingdom); Stephen David Greaves, Cambridge (United Kingdom); and Malcolm Paul Sellars, Ely (United Kingdom)
Assigned to Cambridge Broadband Networks Limited, Cambridge (United Kingdom)
Appl. No. 10/538,561 PCT Filed Nov. 12, 2002, PCT No. PCT/GB03/05039 § 371(c)(1), (2), (4) Date Nov. 23, 2005, PCT Pub. No. WO2004/054192, PCT Pub. Date Jun. 24, 2004.
Claims priority of application No. 0229065.8 (GB), filed on Dec. 12, 2002.
Prior Publication US 2006/0148428 A1, Jul. 06, 2006
Int. Cl. H04B 15/00 (2006.01); H04B 1/04 (2006.01); H04K 1/02 (2006.01)

U.S. Cl. 375—285  [375/219; 375/295; 375/296; 375/316; 375/346; 455/114.2; 455/114.3; 455/63.1; 332/107; 332/159; 332/160; 370/338]

28 Claims

1. A fixed wireless access (FWA) communications system comprising an access point and a plurality of subscriber units each transmitting a predetermined data sequence: comprising means for determining the impulse response of the upstream channel between each subscriber unit and the access point; means for generating a data sequence for transmission from a subscriber unit to the access point, the data comprising the predetermined data sequence pre-distorted to compensate for the channel impulse response of the upstream channel between the subscriber unit and the access point, means for storing the pre-distorted predetermined data sequence within the subscriber unit, and means for transmitting the stored sequence from the subscriber unit to the access point when it is desired to transmit the predetermined sequence to the access point; wherein the means for generating the data sequence for transmission from the subscriber unit to the access point comprises a processor for calculating the pre-distorted predetermined data sequence from the upstream channel response and the predetermined data sequence using the Moore-Penrose Pseudo-Inverse Algorithm.