Introduction to Wireless Communications

Trace the history of wireless communications from early telephony to 4G, compare cdma, tdma, gsm approaches, and explain frequency reuse and cell clustering that boost spectrum efficiency.

Explore how wireless channel properties determine modulation and porting techniques. Analyze free-space path loss with line-of-sight, distance and frequency effects, and how multipath causes delay and convolution in the channel.

Explains wireless capacity as Shannon capacity in bits per second, driven by bandwidth and signal-to-noise ratio, and shows how increasing bandwidth boosts capacity with examples from HSDPA and LTE.

Channel coding adds redundancy to improve data reliability toward Shannon capacity, using repetition codes and majority decoding, and comparing Hamming distance with soft and Euclidean metrics for decoding codewords.

Learn digital modulation and demodulation for wireless systems, including frequency, phase, and amplitude shift keying with binary inputs, and coherent in-phase and quadrature demodulation using carrier multiplication and low-pass filtering.

Explore OFDM and frequency-domain equalization for wireless systems. Learn how subcarriers share bandwidth, preserve capacity, and use cyclic prefixes to simplify demodulation.

Explains mimo as a cornerstone of wireless systems, using space-time coding and diversity techniques to boost reliability and capacity while comparing selection, equal gain, and maximal ratio combining.

Discover 4g standards and how lte and wimax competed, comparing cdma and tdma origins, spectrum efficiency, and mobility across radio access technologies.

Explore 5g and beyond, covering millimeter-wave bands, beamforming and massive mimo, energy-efficient transmission, low latency, and challenges like pilot contamination and base-station coordination in heterogeneous networks.