Diversity combining offers a large variety of schemes for improved bit-error-rate (BER) in packet communications. The majority of the schemes are designed to combat noise. The scheme considers metric ratio combining (MRC), Chase combining and code combining. The paper also simulates and derives the theoretical average throughput of a diversity combining schemes employing turbo coding over Rayleigh fading channels. The paper proposes an expression for the selection of hybrid ARQ schemes based on a signal-to-interference-plus-noise-ratio (SINR), in the presence of cochannel interference. The presented SINR expression reduces to an average signal-to-noise ratio (SNR) when no co-channel interference exists.