In a multi-user communication system, a pre-coder in a transmitter comprises a Discrete
Fourier Transform (DFT) spreader configured to spread reference-signal symbols with …

6,362,790 B1 3/2002 Proctor, Jr. et al. 7.587177 B1 9/2009 E.. 6,396.456 B1 5/2002 Chiang
et al. 7.592969 B2 92009 Proctor, Jr. etal 6,400,317 B2 6/2002 Rouphael et al. 7.593726 B2 …

An OFDM transmitter spreads original data symbols with a complex-valued spreading matrix
derived from a discrete Fourier transform. Spread data symbols are mapped to OFDM …

US PATENT DOCUMENTS nals, fast acknowledgment, and quick resource assignments.
Calibration may be performed to account for differences in the frequency responses of …

(57) ABSTRACT A intelligent backhaul radio is disclosed, which can operate by Zero
division duplexing for use in PTP or PMP topologies, providing for significant spectrum …

(60) Provisional application No. 60/421,309,? led on Oct.(57) ABSTRACT 25, 2002,
provisional application No. 60/421,462,? led on Oct. 25, 2002, provisional application No …

A software defined radio (SDR) virtualizes physical-layer processing operations of a radio
access network (RAN) communication standard. The SDR comprises multiple components …

A MIMO system supports multiple spatial multiplexing modes for improved performance and
greater flexibility. These modes may include (1) a single-user steered mode that transmits …

A multiple-input multiple-output (MIMO) system can transmit on multiple antennas
simultaneously and receive on multiple antennas simultaneously. Unfortunately, because a …

A intelligent backhaul radio is disclosed, which can operate by zero division duplexing for
use in PTP or PMP topologies, providing for significant spectrum usage benefits among …