MIMO-based multiuser OFDM multiband for ultra wideband communications
OwnerGeorge J. Miaoinventor
Life of this patent
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Abstract
A MIMO-based multiuser OFDM multiband of UWB communications is presented to meet FCC emission limitations for indoor UWB operations. The present UWB system divides a single UWB frequency band of 7.5 GHz into eleven frequency bands as a multiband. Each frequency band has 650-MHz frequency bandwidth, uses an OFDM with multicarrier, and employs different modulations. The present UWB system can be programmable not only to transmit different data rates in a relatively longer distance but also to avoid interference with other devices by controlling the multiband and/or some of the multicarrier within each of the OFDM. The present UWB system can transmit a very high data rate up to 11 Gbps approximately.
Claims17
A multiple-input multiple-output (MIMO)-based multiuser orthogonal frequency division multiplex (OFDM) multiband of ultra wideband (UWB) base station communication transmitter comprising:
- p user bitstream coupled to p convolution encoders, where p is an integer and greater than 1;
- said p convolution encoders coupled to p interleavers;
- p outputs of said p interleavers spread out by p user keys to form an encoded sequence by a sum over a block;
- each of said p user keys is a unique and orthogonal each other;
- said sum over a block coupled to a polyphase-based multiband;
- wherein said polyphase-based multiband includes a random access memory (RAM) bank with a length size of N for storing serial input data and P RAM banks with a length size of N/P for storing parallel output data, where N, and P are integers and greater than 1, N is greater than P, and N/P is an integer;
- said polyphase-based multiband coupled to k serial-to-parallel (S/P), where k is an integer and greater than 1;
- said k S/P coupled to k inverse fast Fourier transforms (IFFTs);
- said k IFFTs coupled to k guards;
- said k guards coupled to k filtering and spreading units;
- said k filtering and spreading units coupled to a MIMO-based multiband and multicarrier radio frequency (RF) unit;
- and
- said MIMO-based multiband and multicarrier RF unit coupled to k antennas.
A multiple-input multiple-output (MIMO)-based multiuser orthogonal frequency division multiplex (OFDM) multiband of ultra wideband (UWB) mobile communication receiver comprising:
- two antennas;
- a two-antenna based multiband radio frequency (RF) receiver unit;
- said two-antenna based multiband RF receiver unit coupled to a combination section including an analog-to-digital (A/D) unit, a digital receiver filter unit, and a multiband-despreading unit;
- said A/D unit further including 2k A/D converters with the same sampling rate and resolution, where k is an integer and greater than 1;
- said digital receiver filter unit further having 2k digital receiver filters;
- said 2k A/D converters coupled to 2k digital receiver filters;
- said multiband-despreading unit further comprising k multiband spreading;
- each of said k multiband spreading spreads out two outputs of the said digital receiver filters via two exclusive-OR (XOR) modules;
- said combination section coupled to a time-domain equalizer (TEQ) unit, which is M inputs and outputs where M is an integer and greater than 1;
- said TEQ unit coupled to k serial-to-parallel (S/P) followed by k guard removings that are connected to k fast Fourier transforms (FFTs);
- each of said k FFTs having 2N inputs, N outputs, N disable-point, where N is an integer and greater than 1;
- said k FFTs coupled to k frequency-domain equalizer (FEQ) units that are connected with k parallel-to-serial (P/S);
- each of said FEQ units further including Q equalizers, Q decision detectors, Q subtractors, and an adaptive algorithm, where Q is an integer and greater than 1;
- said k P/S coupled to a polyphase-based demultiband;
- and
- said polyphase-based demultiband coupled to a despreading, deinterleaver, and decoding unit.
A multiple-input multiple-output (MIMO)-based multiuser orthogonal frequency division multiplex (OFDM) multiband of ultra wideband (UWB) communication system comprising:
- a MIMO-based multiuser OFDM multiband of UWB base station communication transmitter and receiver;
- said MIMO-based multiuser OFDM multiband of UWB base station communication transmitter and receiver having N base station antennas, wherein said N base station antennas of the MIMO-based multiuser OFDM multiband of UWB base station communication transmitter and receiver are programmable and further wherein the fourth and/or fifth base station antennas can be turned off to avoid interference with wireless local area network (WLAN) devices, where N is an integer and greater than 5;
- said N base station antennas are controllable;
- said MIMO-based multiuser OFDM multiband of UWB base station communication transmitter and receiver coupled to an UWB network interface unit;
- said UWB network interface unit coupled to an UWB network;
- P MIMO-based OFDM multiband of UWB mobile communication transmitters and receivers, where P is an integer and greater than 1;
- each of said P MIMO-based OFDM multiband of UWB mobile communication transmitters and receivers having Q mobile station antennas, where Q is an integer and greater than 1;
- said Q mobile station antennas are controllable;
- the number of said N base station antennas is greater than the number of said Q mobile station antennas;
- and
- said P MIMO-based OFDM multiband of UWB mobile communication transmitters and receivers communicate with said MIMO-based multiuser OFDM multiband of UWB base station communication transmitter and receiver via a MIMO channel link.
Dependencies are inferred from the claim text.