Recent OFDM Headlines
FreshPatents.com Method for digital wireless message transmission over a broadband mobile radio channel
In an OFDM multi carrier modulation method, M sub-carriers are used in a frequency band of a broadband mobile radio channel and several symbols are used in a time band. With application of a MIMO multi-antenna method with T transmitting antennae and R receiving antennae, for all sub-carriers and all...
FreshPatents.com Transmitter, ofdm communication system, and transmission method
In a cellular system using an OFDM scheme, a transmitter multiplies subcarriers for channel estimation by codes and transmits them, the codes being such that a phase difference f of the code multiplied with consecutive subcarriers for channel estimation is constant, and a code of every M consecutive subcarriers (M...
FreshPatents.com Power savings in ofdm-based wireless communication
In a wireless communications system using Orthogonal Frequency Division Multiplex technology, changing the nature of the signals being transmitted/received may be used to reduce power consumption. In one embodiment, reducing the number of carriers that are being employed may be used to decrease power consumption by permitting a reduced clock...
FreshPatents.com Mobile channel estimation for dvb-t cofdm demodulator
A channel estimator for use in a DVB-T system is capable of high Doppler performance without incurring restrictive delay spread limitations, in a hardware efficient manner. A first channel impulse response is generated that has ambiguity due to under-sampling in the frequency domain. A filter is then used to filter...
IEEE Resource Allocation in OFDMA Wireless Communications Systems Supporting Multimedia Services
We design a resource allocation algorithm for downlink of orthogonal frequency division multiple access (OFDMA) systems supporting real-time (RT) and best-effort (BE) services simultaneously over a time-varying wireless channel. The proposed algorithm aims at maximizing system throughput while satisfying quality of service (QoS) requirements of the RT and BE services. We take two kinds of QoS requirements into account. One is the required average transmission rate for both RT and BE services. The ot...
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