US 8,619,655 B2 · Cyclic shift delay (CSD) short training field (STF) for orthogonal frequency division multiplexing (OFDM) signaling within multiple user, multiple access, and/or MIMO wireless communicaitons

Abstract

Cyclic shift delay (CSD) short training field (STF) for use within multiple user, multiple access, and/or MIMO wireless communications. Appropriately designed CSD STF is applied to communications in wireless communication systems thereby ensuring a minimized power error difference between respective portions of a packet transmitted therein. A first portion of the packet may be a short training field (STF) and a second portion of the packet may be a payload (e.g., a data portion). By applying such appropriately designed CSD STF to a packet, a wireless communication device that receives a signal corresponding to that packet need not perform extra or very significant backoff (e.g., with respect to a signal subsequent to automatic gain control (AGC) processing) thereby simplifying processing of that signal and potentially also reducing a total number of effective analog to digital converter (ADC) bits needed to represent a digitally sampled version of that signal.

Claims20

Dependent claims

A method for operating a wireless communication device, the method comprising:

generating a packet including a cyclic shift delayed (CSD) short training field (STF) and a payload in accordance with a plurality of CSDs, each of the plurality of CSDs being a respective integer multiple of a time period, for minimizing difference between a first power associated with the CSD STF and a second power associated with the payload;
and
via a plurality of antennae, transmitting a signal including the packet to a plurality of wireless communication devices such that each of the plurality of antennae transmitting at a respective time in accordance a respective one of the plurality of CSDs.

An apparatus, comprising:

a baseband processing module to generate:
a management frame indicating for which of a plurality of wireless communication devices a multi-user packet being intended and indicating a plurality of streams by which the multi-user packet being transmitted;
and
the multi-user packet including a cyclic shift delayed (CSD) short training field (STF) and a payload in accordance with a plurality of CSDs for minimizing difference between a first power associated with the CSD STF and a second power associated with the payload;
and
a plurality of antennae to transmit:
a first signal including the management frame to the plurality of wireless communication devices;
and
a second signal including the multi-user packet to the plurality of wireless communication devices;
and wherein:
each of the plurality of CSDs being a respective integer multiple of a time period;
each of the plurality of antennae to transmit at a respective time in accordance a respective one of the plurality of CSDs;
a first portion of the multi-user packet being intended for a first of the plurality of wireless communication devices;
and
a second portion of the multi-user packet being intended for a second of the plurality of wireless communication devices.

12 more elements

Dependencies are inferred from the claim text.

Facts

Application

13/073,716Filed 28 Mar 2011 · us provisional application

Priority

9 Jun 2010

Published

US 2011/0305178 A115 Dec 2011

Granted

31 Dec 2013

Term ends

Not estimatedThe source records don’t support an estimate.

Classification7 codes

H04B 7/0671
Of delayed versions of same signal: using different delays between antennas
H04W 52/16
TPC algorithms: deriving transmission power values from another channel
H04W 52/42
TPC being performed in particular situations: in systems with time, space, frequency or polarisation diversity
Y02D 30/70
Reducing energy consumption in communication networks: in wireless communication networks

Family

Application61/353,184Us provisional application · filed 9 Jun 2010

Application61/357,936Us provisional application · filed 23 Jun 2010

Application61/387,930Us provisional application · filed 29 Sep 2010

Application61/390,295Us provisional application · filed 6 Oct 2010

US 2011/0305178 A1Pre-grant publication · published 15 Dec 2011

US 8,619,655 B2This patent

From the US filing history. Foreign family members aren’t listed.

Cyclic shift delay (CSD) short training field (STF) for orthogonal frequency division multiplexing (OFDM) signaling within multiple user, multiple access, and/or MIMO wireless communicaitons

Life of this patent

Cyclic shift delay (CSD) short training field (STF) for orthogonal frequency division multiplexing (OFDM) signaling within multiple user, multiple access, and/or MIMO wireless communicaitons

Life of this patent

Abstract

Claims20