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Frequency-Time Block Codes for OFDMA Uplink Applications
White Paper The annoying effect of ISI is almost all removed by the insertion of a cyclic prefix (or postfix) extension. Orthogonal Frequency Division Multiplexing (OFDM) is a multi-carrier block modulation scheme primarily used in high bit rate systems to... [03 Jul 2008]
Scalable Video Transmission Over Orthogonal Frequency Division Multiplexing Wireless Channels
White Paper Block transmissions using a cyclic prefix are used to eliminate Inter Block interference (IBI). Rate Compatible Punctured Convolutional codes (RCPC codes) are used for error protection. In this paper a wireless system for video transmission over... [03 Jul 2008]
An Optimum OFDM Receiver Exploiting Cyclic Prefix for Improved Data Estimation
White Paper A drawback of OFDM systems is the performance/rate reduction due to the cyclic prefix overhead. This paper proposes receiver structures that exploit the cyclic prefix to increase the performance of the link. [10 Apr 2008]
A Dual-Path TEQ Structure for DMT-ADSL Systems
White Paper DMT modulation allows for simplified equalization when the effective duration of the channel memory is shorter that the predefined length of the cyclic prefix (CP). A single time-domain equalizer (TEQ) is typically used to truncate the channel... [10 Apr 2008]
OFDM Versus Single Carrier With Cyclic Prefix: A System-Based Comparison
White Paper This paper shows that for the same data rate, bandwidth and transmit power constraints Single-Carrier with Cyclic Prefix (SC-CP) allows the design of a more power efficient modem than OFDM and is therefore a better candidate for portable wireless... [10 Apr 2008]
An OFDM Timing Synchronization ASIC
White Paper The algorithm is based on the correlation introduced by the cyclic prefix, which is exploited in the time domain where the time offset is estimated. At the sample rate of 25 Msamples/s the power consumption is 16 mW, which is small for such a... [26 Jul 2005]
An Optimum OFDM Receiver Exploiting Cyclic Prefix for Improved Data Estimation
A drawback of OFDM systems is the performance/rate reduction due to the cyclic prefix overhead. This paper proposes receiver structures that exploit the cyclic prefix to increase the performance of the link. [28 Mar 2005]
Precoded and Vector OFDM Robust to Channel Spectral Nulls and With Reduced Cyclic Prefix Length in Single Transmit Antenna Systems
White Paper Also, when ISI channels have many taps, the data rate overhead due to the insertion of the cyclic prefix is high. It also proposes size K x 1 vector OFDM (VOFDM) systems that reduce the cyclic prefix length by K times compared to the conventional... [21 Oct 2004]
Subspace-Based Blind Channel Estimation for OFDM by Exploiting Virtual Carriers
White Paper Several options exist in practical OFDM systems - including training symbols, cyclic prefix, virtual carriers, pilot tones, and receiver diversity - to facilitate channel estimation. The method can be applied to conventional OFDM systems with... [21 Oct 2004]
Multicarrier CDMA Systems Using PCC-OFDM
White Paper Equalizers to counteract multipath transmission are much simpler for PCC-OFDM than for single carrier systems or for OFDM systems without a cyclic prefix. It is shown that the proposed system gives lower bit error rate (BER) than OFDM for channels... [21 Oct 2004]
The Performance of Overlap PCC-OFDM With Error-Correcting Codes
White Paper A cyclic prefix is no longer needed. In this paper, error-correcting codes across the Subchannels are applied to improve the symbol error rate (SER). Polynomial cancellation coded orthogonal frequency division multiplexing with overlapping symbol... [21 Oct 2004]
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