Paul K. M. Ho

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A feature-suppressed orthogonal frequency-division multiplexing (OFDM) system and the corresponding channel estimation and intersymbol interference (ISI) mitigation techniques are investigated in this paper. Cyclic prefix (CP) and pilot tones, which are commonly used in civilian OFDM systems for ISI mitigation and channel estimation, create distinctive(More)
Many investigations of hybrid selection (HS) diversity assume maximal ratio combining (MRC) of the selected branches. However, a coherent detector needs to dwell on the received signal for some time before it can produce accurate channel estimates for fading compensation, a requirement that appears inconsistent with the branch switching that occurs in a(More)
In this paper, the performance of a closed-loop transmit beamforming system employing the ";unconventional"; technique of analog channel state information (CSI) feedback is studied. The use of analog or unquantized symbols for CSI feedback leads to a low feedback rate of only one symbol per transmit antenna per frame, and does not result in an unrecoverable(More)
Multiple-symbol differential detection (MSDD) is a robust maximum-likelihood (ML) receiver technique for frequency-nonselective fast Rayleigh fading channels. However, its complexity grows exponentially with the block size N and that makes it impractical to implement. Recently, multiple-symbol differential sphere decoder (MSDSD) is developed to alleviate(More)
We develop in this paper an Alamouti-type space- time (ST) block code that employs orthogonal <i>M</i>-ary FSK (MFSK) modulation. It is demonstrated that every transmitted symbol in the proposed ST-MFSK scheme can be treated as an implicit pilot symbol, and consequently the receiver can attain close to ideal coherent bit-error performance even in the(More)
This letter presents a method for exact calculation of the union bound on error performance of trellis-coded modulation (TCM) in fading channels. Previous analyses have approximated the error expression to allow use of the transfer function, or restricted their attention to the most common error events, or both. In contrast, we combine the transfer(More)